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Publisher: Elsevier   (Total: 3043 journals)

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Showing 1 - 200 of 3043 Journals sorted alphabetically
AASRI Procedia     Open Access   (Followers: 15)
Academic Pediatrics     Hybrid Journal   (Followers: 20, SJR: 1.402, h-index: 51)
Academic Radiology     Hybrid Journal   (Followers: 18, SJR: 1.008, h-index: 75)
Accident Analysis & Prevention     Partially Free   (Followers: 83, SJR: 1.109, h-index: 94)
Accounting Forum     Hybrid Journal   (Followers: 23, SJR: 0.612, h-index: 27)
Accounting, Organizations and Society     Hybrid Journal   (Followers: 27, SJR: 2.515, h-index: 90)
Achievements in the Life Sciences     Open Access   (Followers: 4)
Acta Anaesthesiologica Taiwanica     Open Access   (Followers: 5, SJR: 0.338, h-index: 19)
Acta Astronautica     Hybrid Journal   (Followers: 333, SJR: 0.726, h-index: 43)
Acta Automatica Sinica     Full-text available via subscription   (Followers: 3)
Acta Biomaterialia     Hybrid Journal   (Followers: 25, SJR: 2.02, h-index: 104)
Acta Colombiana de Cuidado Intensivo     Full-text available via subscription   (Followers: 1)
Acta de Investigación Psicológica     Open Access   (Followers: 2)
Acta Ecologica Sinica     Open Access   (Followers: 8, SJR: 0.172, h-index: 29)
Acta Haematologica Polonica     Free   (SJR: 0.123, h-index: 8)
Acta Histochemica     Hybrid Journal   (Followers: 3, SJR: 0.604, h-index: 38)
Acta Materialia     Hybrid Journal   (Followers: 225, SJR: 3.683, h-index: 202)
Acta Mathematica Scientia     Full-text available via subscription   (Followers: 5, SJR: 0.615, h-index: 21)
Acta Mechanica Solida Sinica     Full-text available via subscription   (Followers: 9, SJR: 0.442, h-index: 21)
Acta Oecologica     Hybrid Journal   (Followers: 9, SJR: 0.915, h-index: 53)
Acta Otorrinolaringologica (English Edition)     Full-text available via subscription   (Followers: 1)
Acta Otorrinolaringológica Española     Full-text available via subscription   (Followers: 3, SJR: 0.311, h-index: 16)
Acta Pharmaceutica Sinica B     Open Access   (Followers: 2)
Acta Poética     Open Access   (Followers: 4)
Acta Psychologica     Hybrid Journal   (Followers: 23, SJR: 1.365, h-index: 73)
Acta Sociológica     Open Access  
Acta Tropica     Hybrid Journal   (Followers: 6, SJR: 1.059, h-index: 77)
Acta Urológica Portuguesa     Open Access  
Actas Dermo-Sifiliograficas     Full-text available via subscription   (Followers: 4)
Actas Dermo-Sifiliográficas (English Edition)     Full-text available via subscription   (Followers: 3)
Actas Urológicas Españolas     Full-text available via subscription   (Followers: 4, SJR: 0.383, h-index: 19)
Actas Urológicas Españolas (English Edition)     Full-text available via subscription   (Followers: 2)
Actualites Pharmaceutiques     Full-text available via subscription   (Followers: 5, SJR: 0.141, h-index: 3)
Actualites Pharmaceutiques Hospitalieres     Full-text available via subscription   (Followers: 4, SJR: 0.112, h-index: 2)
Acupuncture and Related Therapies     Hybrid Journal   (Followers: 3)
Ad Hoc Networks     Hybrid Journal   (Followers: 11, SJR: 0.967, h-index: 57)
Addictive Behaviors     Hybrid Journal   (Followers: 15, SJR: 1.514, h-index: 92)
Addictive Behaviors Reports     Open Access   (Followers: 5)
Additive Manufacturing     Hybrid Journal   (Followers: 8, SJR: 1.039, h-index: 5)
Additives for Polymers     Full-text available via subscription   (Followers: 20)
Advanced Drug Delivery Reviews     Hybrid Journal   (Followers: 134, SJR: 5.2, h-index: 222)
Advanced Engineering Informatics     Hybrid Journal   (Followers: 11, SJR: 1.265, h-index: 53)
Advanced Powder Technology     Hybrid Journal   (Followers: 16, SJR: 0.739, h-index: 33)
Advances in Accounting     Hybrid Journal   (Followers: 9, SJR: 0.299, h-index: 15)
Advances in Agronomy     Full-text available via subscription   (Followers: 15, SJR: 2.071, h-index: 82)
Advances in Anesthesia     Full-text available via subscription   (Followers: 25, SJR: 0.169, h-index: 4)
Advances in Antiviral Drug Design     Full-text available via subscription   (Followers: 3)
Advances in Applied Mathematics     Full-text available via subscription   (Followers: 6, SJR: 1.054, h-index: 35)
Advances in Applied Mechanics     Full-text available via subscription   (Followers: 10, SJR: 0.801, h-index: 26)
Advances in Applied Microbiology     Full-text available via subscription   (Followers: 22, SJR: 1.286, h-index: 49)
Advances In Atomic, Molecular, and Optical Physics     Full-text available via subscription   (Followers: 16, SJR: 3.31, h-index: 42)
Advances in Biological Regulation     Hybrid Journal   (Followers: 4, SJR: 2.277, h-index: 43)
Advances in Botanical Research     Full-text available via subscription   (Followers: 3, SJR: 0.619, h-index: 48)
Advances in Cancer Research     Full-text available via subscription   (Followers: 25, SJR: 2.215, h-index: 78)
Advances in Carbohydrate Chemistry and Biochemistry     Full-text available via subscription   (Followers: 9, SJR: 0.9, h-index: 30)
Advances in Catalysis     Full-text available via subscription   (Followers: 5, SJR: 2.139, h-index: 42)
Advances in Cellular and Molecular Biology of Membranes and Organelles     Full-text available via subscription   (Followers: 12)
Advances in Chemical Engineering     Full-text available via subscription   (Followers: 24, SJR: 0.183, h-index: 23)
Advances in Child Development and Behavior     Full-text available via subscription   (Followers: 10, SJR: 0.665, h-index: 29)
Advances in Chronic Kidney Disease     Full-text available via subscription   (Followers: 10, SJR: 1.268, h-index: 45)
Advances in Clinical Chemistry     Full-text available via subscription   (Followers: 28, SJR: 0.938, h-index: 33)
Advances in Colloid and Interface Science     Full-text available via subscription   (Followers: 18, SJR: 2.314, h-index: 130)
Advances in Computers     Full-text available via subscription   (Followers: 16, SJR: 0.223, h-index: 22)
Advances in Developmental Biology     Full-text available via subscription   (Followers: 11)
Advances in Digestive Medicine     Open Access   (Followers: 4)
Advances in DNA Sequence-Specific Agents     Full-text available via subscription   (Followers: 5)
Advances in Drug Research     Full-text available via subscription   (Followers: 22)
Advances in Ecological Research     Full-text available via subscription   (Followers: 42, SJR: 3.25, h-index: 43)
Advances in Engineering Software     Hybrid Journal   (Followers: 25, SJR: 0.486, h-index: 10)
Advances in Experimental Biology     Full-text available via subscription   (Followers: 7)
Advances in Experimental Social Psychology     Full-text available via subscription   (Followers: 40, SJR: 5.465, h-index: 64)
Advances in Exploration Geophysics     Full-text available via subscription   (Followers: 3)
Advances in Fluorine Science     Full-text available via subscription   (Followers: 8)
Advances in Food and Nutrition Research     Full-text available via subscription   (Followers: 47, SJR: 0.674, h-index: 38)
Advances in Fuel Cells     Full-text available via subscription   (Followers: 15)
Advances in Genetics     Full-text available via subscription   (Followers: 15, SJR: 2.558, h-index: 54)
Advances in Genome Biology     Full-text available via subscription   (Followers: 11)
Advances in Geophysics     Full-text available via subscription   (Followers: 6, SJR: 2.325, h-index: 20)
Advances in Heat Transfer     Full-text available via subscription   (Followers: 21, SJR: 0.906, h-index: 24)
Advances in Heterocyclic Chemistry     Full-text available via subscription   (Followers: 8, SJR: 0.497, h-index: 31)
Advances in Human Factors/Ergonomics     Full-text available via subscription   (Followers: 26)
Advances in Imaging and Electron Physics     Full-text available via subscription   (Followers: 2, SJR: 0.396, h-index: 27)
Advances in Immunology     Full-text available via subscription   (Followers: 35, SJR: 4.152, h-index: 85)
Advances in Inorganic Chemistry     Full-text available via subscription   (Followers: 9, SJR: 1.132, h-index: 42)
Advances in Insect Physiology     Full-text available via subscription   (Followers: 3, SJR: 1.274, h-index: 27)
Advances in Integrative Medicine     Hybrid Journal   (Followers: 5)
Advances in Intl. Accounting     Full-text available via subscription   (Followers: 4)
Advances in Life Course Research     Hybrid Journal   (Followers: 8, SJR: 0.764, h-index: 15)
Advances in Lipobiology     Full-text available via subscription   (Followers: 2)
Advances in Magnetic and Optical Resonance     Full-text available via subscription   (Followers: 9)
Advances in Marine Biology     Full-text available via subscription   (Followers: 16, SJR: 1.645, h-index: 45)
Advances in Mathematics     Full-text available via subscription   (Followers: 10, SJR: 3.261, h-index: 65)
Advances in Medical Sciences     Hybrid Journal   (Followers: 6, SJR: 0.489, h-index: 25)
Advances in Medicinal Chemistry     Full-text available via subscription   (Followers: 5)
Advances in Microbial Physiology     Full-text available via subscription   (Followers: 4, SJR: 1.44, h-index: 51)
Advances in Molecular and Cell Biology     Full-text available via subscription   (Followers: 22)
Advances in Molecular and Cellular Endocrinology     Full-text available via subscription   (Followers: 10)
Advances in Molecular Toxicology     Full-text available via subscription   (Followers: 7, SJR: 0.324, h-index: 8)
Advances in Nanoporous Materials     Full-text available via subscription   (Followers: 4)
Advances in Oncobiology     Full-text available via subscription   (Followers: 3)
Advances in Organometallic Chemistry     Full-text available via subscription   (Followers: 15, SJR: 2.885, h-index: 45)
Advances in Parallel Computing     Full-text available via subscription   (Followers: 7, SJR: 0.148, h-index: 11)
Advances in Parasitology     Full-text available via subscription   (Followers: 7, SJR: 2.37, h-index: 73)
Advances in Pediatrics     Full-text available via subscription   (Followers: 24, SJR: 0.4, h-index: 28)
Advances in Pharmaceutical Sciences     Full-text available via subscription   (Followers: 13)
Advances in Pharmacology     Full-text available via subscription   (Followers: 15, SJR: 1.718, h-index: 58)
Advances in Physical Organic Chemistry     Full-text available via subscription   (Followers: 7, SJR: 0.384, h-index: 26)
Advances in Phytomedicine     Full-text available via subscription  
Advances in Planar Lipid Bilayers and Liposomes     Full-text available via subscription   (Followers: 3, SJR: 0.248, h-index: 11)
Advances in Plant Biochemistry and Molecular Biology     Full-text available via subscription   (Followers: 8)
Advances in Plant Pathology     Full-text available via subscription   (Followers: 5)
Advances in Porous Media     Full-text available via subscription   (Followers: 4)
Advances in Protein Chemistry     Full-text available via subscription   (Followers: 18)
Advances in Protein Chemistry and Structural Biology     Full-text available via subscription   (Followers: 19, SJR: 1.5, h-index: 62)
Advances in Psychology     Full-text available via subscription   (Followers: 60)
Advances in Quantum Chemistry     Full-text available via subscription   (Followers: 5, SJR: 0.478, h-index: 32)
Advances in Radiation Oncology     Open Access  
Advances in Small Animal Medicine and Surgery     Hybrid Journal   (Followers: 2, SJR: 0.1, h-index: 2)
Advances in Space Research     Full-text available via subscription   (Followers: 345, SJR: 0.606, h-index: 65)
Advances in Structural Biology     Full-text available via subscription   (Followers: 8)
Advances in Surgery     Full-text available via subscription   (Followers: 7, SJR: 0.823, h-index: 27)
Advances in the Study of Behavior     Full-text available via subscription   (Followers: 30, SJR: 1.321, h-index: 56)
Advances in Veterinary Medicine     Full-text available via subscription   (Followers: 16)
Advances in Veterinary Science and Comparative Medicine     Full-text available via subscription   (Followers: 13)
Advances in Virus Research     Full-text available via subscription   (Followers: 5, SJR: 1.878, h-index: 68)
Advances in Water Resources     Hybrid Journal   (Followers: 43, SJR: 2.408, h-index: 94)
Aeolian Research     Hybrid Journal   (Followers: 5, SJR: 0.973, h-index: 22)
Aerospace Science and Technology     Hybrid Journal   (Followers: 310, SJR: 0.816, h-index: 49)
AEU - Intl. J. of Electronics and Communications     Hybrid Journal   (Followers: 8, SJR: 0.318, h-index: 36)
African J. of Emergency Medicine     Open Access   (Followers: 5, SJR: 0.344, h-index: 6)
Ageing Research Reviews     Hybrid Journal   (Followers: 8, SJR: 3.289, h-index: 78)
Aggression and Violent Behavior     Hybrid Journal   (Followers: 408, SJR: 1.385, h-index: 72)
Agri Gene     Hybrid Journal  
Agricultural and Forest Meteorology     Hybrid Journal   (Followers: 15, SJR: 2.18, h-index: 116)
Agricultural Systems     Hybrid Journal   (Followers: 30, SJR: 1.275, h-index: 74)
Agricultural Water Management     Hybrid Journal   (Followers: 38, SJR: 1.546, h-index: 79)
Agriculture and Agricultural Science Procedia     Open Access  
Agriculture and Natural Resources     Open Access   (Followers: 1)
Agriculture, Ecosystems & Environment     Hybrid Journal   (Followers: 53, SJR: 1.879, h-index: 120)
Ain Shams Engineering J.     Open Access   (Followers: 5, SJR: 0.434, h-index: 14)
Air Medical J.     Hybrid Journal   (Followers: 5, SJR: 0.234, h-index: 18)
AKCE Intl. J. of Graphs and Combinatorics     Open Access   (SJR: 0.285, h-index: 3)
Alcohol     Hybrid Journal   (Followers: 9, SJR: 0.922, h-index: 66)
Alcoholism and Drug Addiction     Open Access   (Followers: 6)
Alergologia Polska : Polish J. of Allergology     Full-text available via subscription   (Followers: 1)
Alexandria Engineering J.     Open Access   (Followers: 1, SJR: 0.436, h-index: 12)
Alexandria J. of Medicine     Open Access  
Algal Research     Partially Free   (Followers: 8, SJR: 2.05, h-index: 20)
Alkaloids: Chemical and Biological Perspectives     Full-text available via subscription   (Followers: 3)
Allergologia et Immunopathologia     Full-text available via subscription   (Followers: 1, SJR: 0.46, h-index: 29)
Allergology Intl.     Open Access   (Followers: 4, SJR: 0.776, h-index: 35)
ALTER - European J. of Disability Research / Revue Européenne de Recherche sur le Handicap     Full-text available via subscription   (Followers: 7, SJR: 0.158, h-index: 9)
Alzheimer's & Dementia     Hybrid Journal   (Followers: 48, SJR: 4.289, h-index: 64)
Alzheimer's & Dementia: Diagnosis, Assessment & Disease Monitoring     Open Access   (Followers: 5)
Alzheimer's & Dementia: Translational Research & Clinical Interventions     Open Access   (Followers: 3)
American Heart J.     Hybrid Journal   (Followers: 48, SJR: 3.157, h-index: 153)
American J. of Cardiology     Hybrid Journal   (Followers: 45, SJR: 2.063, h-index: 186)
American J. of Emergency Medicine     Hybrid Journal   (Followers: 38, SJR: 0.574, h-index: 65)
American J. of Geriatric Pharmacotherapy     Full-text available via subscription   (Followers: 6, SJR: 1.091, h-index: 45)
American J. of Geriatric Psychiatry     Hybrid Journal   (Followers: 16, SJR: 1.653, h-index: 93)
American J. of Human Genetics     Hybrid Journal   (Followers: 31, SJR: 8.769, h-index: 256)
American J. of Infection Control     Hybrid Journal   (Followers: 24, SJR: 1.259, h-index: 81)
American J. of Kidney Diseases     Hybrid Journal   (Followers: 33, SJR: 2.313, h-index: 172)
American J. of Medicine     Hybrid Journal   (Followers: 46, SJR: 2.023, h-index: 189)
American J. of Medicine Supplements     Full-text available via subscription   (Followers: 3)
American J. of Obstetrics and Gynecology     Hybrid Journal   (Followers: 187, SJR: 2.255, h-index: 171)
American J. of Ophthalmology     Hybrid Journal   (Followers: 54, SJR: 2.803, h-index: 148)
American J. of Ophthalmology Case Reports     Open Access   (Followers: 3)
American J. of Orthodontics and Dentofacial Orthopedics     Full-text available via subscription   (Followers: 6, SJR: 1.249, h-index: 88)
American J. of Otolaryngology     Hybrid Journal   (Followers: 23, SJR: 0.59, h-index: 45)
American J. of Pathology     Hybrid Journal   (Followers: 26, SJR: 2.653, h-index: 228)
American J. of Preventive Medicine     Hybrid Journal   (Followers: 21, SJR: 2.764, h-index: 154)
American J. of Surgery     Hybrid Journal   (Followers: 34, SJR: 1.286, h-index: 125)
American J. of the Medical Sciences     Hybrid Journal   (Followers: 12, SJR: 0.653, h-index: 70)
Ampersand : An Intl. J. of General and Applied Linguistics     Open Access   (Followers: 5)
Anaerobe     Hybrid Journal   (Followers: 4, SJR: 1.066, h-index: 51)
Anaesthesia & Intensive Care Medicine     Full-text available via subscription   (Followers: 55, SJR: 0.124, h-index: 9)
Anaesthesia Critical Care & Pain Medicine     Full-text available via subscription   (Followers: 9)
Anales de Cirugia Vascular     Full-text available via subscription  
Anales de Pediatría     Full-text available via subscription   (Followers: 2, SJR: 0.209, h-index: 27)
Anales de Pediatría (English Edition)     Full-text available via subscription  
Anales de Pediatría Continuada     Full-text available via subscription   (SJR: 0.104, h-index: 3)
Analytic Methods in Accident Research     Hybrid Journal   (Followers: 2, SJR: 2.577, h-index: 7)
Analytica Chimica Acta     Hybrid Journal   (Followers: 38, SJR: 1.548, h-index: 152)
Analytical Biochemistry     Hybrid Journal   (Followers: 164, SJR: 0.725, h-index: 154)
Analytical Chemistry Research     Open Access   (Followers: 8, SJR: 0.18, h-index: 2)
Analytical Spectroscopy Library     Full-text available via subscription   (Followers: 11)
Anesthésie & Réanimation     Full-text available via subscription   (Followers: 1)
Anesthesiology Clinics     Full-text available via subscription   (Followers: 22, SJR: 0.421, h-index: 40)
Angiología     Full-text available via subscription   (SJR: 0.124, h-index: 9)
Angiologia e Cirurgia Vascular     Open Access  
Animal Behaviour     Hybrid Journal   (Followers: 158, SJR: 1.907, h-index: 126)
Animal Feed Science and Technology     Hybrid Journal   (Followers: 5, SJR: 1.151, h-index: 83)
Animal Reproduction Science     Hybrid Journal   (Followers: 5, SJR: 0.711, h-index: 78)
Annales d'Endocrinologie     Full-text available via subscription   (Followers: 1, SJR: 0.394, h-index: 30)
Annales d'Urologie     Full-text available via subscription  
Annales de Cardiologie et d'Angéiologie     Full-text available via subscription   (SJR: 0.177, h-index: 13)
Annales de Chirurgie de la Main et du Membre Supérieur     Full-text available via subscription  
Annales de Chirurgie Plastique Esthétique     Full-text available via subscription   (Followers: 2, SJR: 0.354, h-index: 22)
Annales de Chirurgie Vasculaire     Full-text available via subscription   (Followers: 1)

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Journal Cover Advances in Space Research
  [SJR: 0.606]   [H-I: 65]   [345 followers]  Follow
    
   Full-text available via subscription Subscription journal
   ISSN (Print) 0273-1177
   Published by Elsevier Homepage  [3043 journals]
  • Reentry trajectory and survivability estimation of small space debris with
           catalytic recombination
    • Authors: Seong-Hyeon Park; Gisu Park
      Pages: 893 - 906
      Abstract: Publication date: 1 September 2017
      Source:Advances in Space Research, Volume 60, Issue 5
      Author(s): Seong-Hyeon Park, Gisu Park
      A code has been developed to analyze reentry trajectories and survivability of space debris. In particular, an attention was given to small sizes. Based on simple shapes such as a sphere, a cylinder, and a box with sizes of 12.5–50cm, reentry trajectories were calculated. Materials considered were graphite epoxy, aluminum, and titanium. In total, 120 different cases were examined. The results were compared and validated with various existing codes. Good agreement was found. In the heat transfer calculation, all of the existing codes used the well known Lees’ and Fay and Riddell’s formulae which assume an equilibrium boundary layer flow with a super-catalytic wall where the surface recombination efficiency is regarded infinity. In the case of small space debris having sizes of 2.5–10cm, however, the flow residence time behind a shock wave is far too short, so that the super-catalytic assumption leads to over-estimation of surface heat transfer rates. Assuming a frozen boundary layer, a finite catalytic recombination can be considered and the results were compared with that of the super-catalytic cases. Both hollow and solid spheres were considered with different sizes and materials. In total, 24 different cases were examined. The results showed that, 16 out of 24 cases survived, while only 8 cases for the super-catalytic and 19 cases for the non-catalytic walls survived, implying the importance of catalytic wall effects for the study of small space debris.

      PubDate: 2017-07-21T02:12:53Z
      DOI: 10.1016/j.asr.2017.05.004
       
  • The fast co-adding algorithm of QCT
    • Authors: Yiding Ping; Chen Zhang
      Pages: 907 - 914
      Abstract: Publication date: 1 September 2017
      Source:Advances in Space Research, Volume 60, Issue 5
      Author(s): Yiding Ping, Chen Zhang
      This paper presents a fast co-adding algorithm designed to stack the images coming from different channels of QCT in real-time. The algorithm calculates the transformation coefficients for every single exposure to eliminate the effects of the possible shifts of the lenses. The way of reprojection and co-adding applied here is a linear method similar to Drizzle, and a reasonable simplification is applied to accelerate the computation. All the calculation can be finished in about 100ms on a 3.4GHz CPU with 4 cores, which matches the needs for the observation of space debris perfectly, while the limiting magnitude is improved by about 0.8. The co-adding results of our algorithm are very close to SWarp’s, even slightly better in terms of SNRs.

      PubDate: 2017-07-21T02:12:53Z
      DOI: 10.1016/j.asr.2017.05.018
       
  • Touchless attitude correction for satellite with constant magnetic moment
    • Authors: Hou-jun Ao; Le-ping Yang; Yan-wei Zhu; Yuan-wen Zhang; Huan Huang
      Pages: 915 - 924
      Abstract: Publication date: 1 September 2017
      Source:Advances in Space Research, Volume 60, Issue 5
      Author(s): Hou-jun Ao, Le-ping Yang, Yan-wei Zhu, Yuan-wen Zhang, Huan Huang
      Rescue of satellite with attitude fault is of great value. Satellite with improper injection attitude may lose contact with ground as the antenna points to the wrong direction, or encounter energy problems as solar arrays are not facing the sun. Improper uploaded command may set the attitude out of control, exemplified by Japanese Hitomi spacecraft. In engineering practice, traditional physical contact approaches have been applied, yet with a potential risk of collision and a lack of versatility since the mechanical systems are mission-specific. This paper puts forward a touchless attitude correction approach, in which three satellites are considered, one having constant dipole and two having magnetic coils to control attitude of the first. Particular correction configurations are designed and analyzed to maintain the target’s orbit during the attitude correction process. A reference coordinate system is introduced to simplify the control process and avoid the singular value problem of Euler angles. Based on the spherical triangle basic relations, the accurate varying geomagnetic field is considered in the attitude dynamic mode. Sliding mode control method is utilized to design the correction law. Finally, numerical simulation is conducted to verify the theoretical derivation. It can be safely concluded that the no-contact attitude correction approach for the satellite with uniaxial constant magnetic moment is feasible and potentially applicable to on-orbit operations.

      PubDate: 2017-07-21T02:12:53Z
      DOI: 10.1016/j.asr.2017.05.040
       
  • Real-time kinematic PPP GPS for structure monitoring applied on the Severn
           Suspension Bridge, UK
    • Authors: Xu Tang; Gethin Wyn Roberts; Xingxing Li; Craig Matthew Hancock
      Pages: 925 - 937
      Abstract: Publication date: 1 September 2017
      Source:Advances in Space Research, Volume 60, Issue 5
      Author(s): Xu Tang, Gethin Wyn Roberts, Xingxing Li, Craig Matthew Hancock
      GPS is widely used for monitoring large civil engineering structures in real time or near real time. In this paper the use of PPP GPS for monitoring large structures is investigated. The bridge deformation results estimated using double differenced measurements is used as the truth against which the performance of kinematic PPP in a real-time scenario for bridge monitoring is assessed. The towers’ datasets with millimetre level movement and suspension cable dataset with centimetre/decimetre level movement were processed by both PPP and DD data processing methods. The consistency of tower PPP time series indicated that the wet tropospheric delay is the major obstacle for small deflection extraction. The results of suspension cable survey points indicate that an ionospheric-free linear measurement is competent for bridge deformation by PPP kinematic model, the frequency domain analysis yields very similar results using either PPP or DD. This gives evidence that PPP can be used as an alternative method to DD for large structure monitoring when DD is difficult or impossible because of large baseline lengths, power outages or natural disasters. The PPP residual tropospheric wet delays can be applied to improve the capacity of small movement extraction.

      PubDate: 2017-07-21T02:12:53Z
      DOI: 10.1016/j.asr.2017.05.010
       
  • Effects of solar radiation, terrestrial radiation and lunar interior heat
           flow on surface temperature at the nearside of the Moon: Based on
           numerical calculation and data analysis
    • Authors: Yutian Song; Xueqiang Wang; Shengshan Bi; Jiangtao Wu; Shaopeng Huang
      Pages: 938 - 947
      Abstract: Publication date: 1 September 2017
      Source:Advances in Space Research, Volume 60, Issue 5
      Author(s): Yutian Song, Xueqiang Wang, Shengshan Bi, Jiangtao Wu, Shaopeng Huang
      Surface temperature at the nearside of the Moon (Ts,n ) embraces an abundance of valuable information to be explored, and its measurement contributes to studying Earth’s energy budget. On a basis of a one-dimensional unsteady heat-transfer model, this paper ran a quantitative calculation that how much the Ts,n varies with the changes of different heat sources, including solar radiation, terrestrial radiation, and lunar interior heat flow. The results reveal that solar radiation always has the most important influence on Ts,n not only during lunar daytime (by means of radiation balance) but also during lunar nighttime (by means of lunar regolith heat conduction). Besides, the effect of terrestrial radiation is also unavoidable, and measuring the variation of lunar nighttime low temperature is exactly helpful in observing Earth outgoing radiation. Accordingly, it is practical to establish a Moon-base observatory on the Moon. For verification, the Apollo 15 mission temperature data was used and analyzed as well. Moreover, other 9 typical lunar areas were selected and the simulation was run one after another in these areas after proper model amendation. It is shown that the polar regions on the Moon are the best areas for establishing Moon-base observatory.

      PubDate: 2017-07-21T02:12:53Z
      DOI: 10.1016/j.asr.2017.05.013
       
  • Recognizing methods for epicenter-neighboring orbits with ionospheric
           information from DEMETER satellite data
    • Authors: Sicong Zang; Dechang Pi; Xuemin Zhang; Xuhui Shen
      Pages: 980 - 990
      Abstract: Publication date: 1 September 2017
      Source:Advances in Space Research, Volume 60, Issue 5
      Author(s): Sicong Zang, Dechang Pi, Xuemin Zhang, Xuhui Shen
      Due to the temporal and spatial restriction of existing approaches, a recognizing method focuses on all strong seismic activities in globe during the lifecycle of DEMETER (Detection of Electro-Magnetic Emissions Transmitted from Earthquake Regions) is proposed for epicenter-neighboring orbits from the point of view of the Fourth Paradigm. Satellite orbits are regarded as the analyzing objects to reduce the unbalance between the quantity of non-seismic and abnormal data. Two criteria, α 3 and α 4 are put forward to quantify the asymmetry and stability of ionospheric parameters along the orbit and t location-scale distribution is carried out to fit the quantitative indicators. Moreover, during the distribution fitting, the probable cause of two typical types of exceptions are analyzed and explained. In order to determine which magnitude the abnormal α 3 and α 4 are caused by, suitable pairs of thresholds are calculated by means of dynamic time warping (DTW) distance. Finally, three groups of experiments are applied to validate the effectiveness of this method.

      PubDate: 2017-07-21T02:12:53Z
      DOI: 10.1016/j.asr.2017.05.044
       
  • Thermo-optical vacuum testing of IRNSS laser retroreflector array
           qualification model
    • Authors: L. Porcelli; A. Boni; E. Ciocci; S. Contessa; S. Dell’Agnello; G. Delle Monache; N. Intaglietta; M. Martini; C. Mondaini; G. Patrizi; L. Salvatori; M. Tibuzzi; C. Lops; C. Cantone; P. Tuscano; M. Maiello; R. Venkateswaran; P. Chakraborty; C.V. Ramana Reddy; K.V. Sriram
      Pages: 1054 - 1061
      Abstract: Publication date: 1 September 2017
      Source:Advances in Space Research, Volume 60, Issue 5
      Author(s): L. Porcelli, A. Boni, E. Ciocci, S. Contessa, S. Dell’Agnello, G. Delle Monache, N. Intaglietta, M. Martini, C. Mondaini, G. Patrizi, L. Salvatori, M. Tibuzzi, C. Lops, C. Cantone, P. Tuscano, M. Maiello, R. Venkateswaran, P. Chakraborty, C.V. Ramana Reddy, K.V. Sriram
      We describe the activities performed by SCF_Lab (Satellite/lunar/GNSS laser ranging/altimetry and cube/microsat Characterization Facilities Laboratory) of INFN-LNF for the thermo-optical vacuum testing activity of a IRNSS (Indian Regional Navigation Satellite System) LRA (Laser Retroreflector Array), under contract for ISRO-LEOS. To our knowledge, this is the first publication on the characterization of the optical performance of an LRA operating at about 36,000km altitude (typical of regional GNSS segments, namely QZSS, COMPASS-G) executed in fully representative, carefully lab-simulated space conditions. In particular, this is the only such publication concerning IRNSS. Since laser ranging to its altitude is more challenging than to GNSS altitudes (from about 19,100km for GLONASS to about 23,200km for Galileo), comparative measurements were long awaited by ILRS (International Laser Ranging Service) and we present measurements of the absolute laser return to ground stations of the ILRS in terms of lidar OCS (Optical Cross Section) at the IRNSS relevant value of velocity aberration, in turn derived from measurements of the full FFDP (Far Field Diffraction Pattern) over a very large range of velocity aberrations. These measurements were acquired: (i) on a full-size qualification model of a IRNSS CCR (Cube Corner Retroreflector) LRA that ISRO-LEOS provided to INFN-LNF; (ii) during the lab-simulation of a 1/4 orbit segment, in which the LRA CCRs are exposed to the perturbation of the sun heat at varying angles, from grazing incidence (90° with respect to the direction perpendicular to the plane of array), up to the perpendicular to the LRA, with a same time variation consistent with the actual space orbit. In this 1/4 orbit condition, the LRA experiences potentially large thermal degradations of the OCS, depending on the detailed thermal and mechanical design of the LRA. Since all GNSS constellations have different LRA designs or configurations, this is another reason of the interest in the laboratory optical performance of the IRNSS designs. In fact, we tested two different IRNSS LRA configurations, without and with an auxiliary cover. The latter of the configurations is designed to give a somewhat increased performance. We also measured FFDPs and OCS: (1) in-air isothermal conditions (thus obtaining the LRA nominal performance); (2) in space conditions at a low, stationary value of the LRA bulk temperature; (3) in space conditions at a high, stationary value of the LRA bulk temperature (Figs. S1–S18, available in the online supplementary material for this paper). In all these three cases, we measured FFDPs and OCS at the following laser incidence angles: (a) normal to the LRA plane; (b) +9° to the normal to the LRA plane; (c) −9° to the normal to the LRA plane. This is the first time, to our knowledge, that the measurements (not simulations) at ±9° (values requested by ISRO-LEOS) are published for GNSS LRAs. Finally, we point out that we measured full-FFDP and OCS of single CCRs, for maximum diagnostic value and performance validation at subelement level. For all these reasons, the articulate and variate set of tests of the IRNSS LRA reported in this paper is unique.

      PubDate: 2017-07-21T02:12:53Z
      DOI: 10.1016/j.asr.2017.05.012
       
  • Spacecraft orbit propagator integration with GNSS in a simulated scenario
    • Authors: Shuai Jing; Xingqun Zhan; Zhenghong Zhu
      Pages: 1062 - 1079
      Abstract: Publication date: 1 September 2017
      Source:Advances in Space Research, Volume 60, Issue 5
      Author(s): Shuai Jing, Xingqun Zhan, Zhenghong Zhu
      When space vehicles operate above the Global Navigation Satellite System (GNSS) constellation or even above geosynchronous orbit, it is common that the traditional GNSS single–epoch solution can’t meet the requirement of orbit determination (OD). To provide the required OD accuracy continuously, a new designed spacecraft orbit propagator (OP) is combined with the GNSS observations in a deep integration mode. Taking both the computational complexity and positioning accuracy into consideration, the orbit propagator is optimized based on a simplified fourth order Runge-Kutta integral aided with empirical acceleration model. A simulation scenario containing a typical Highly-inclined Elliptical Orbit (HEO) user and GPS constellation is established on a HwaCreat™ GNSS signal simulator to testify the performance of the design. The numerical test results show that the maximum propagation error of the optimized orbit propagator does not exceed 1000m within a day, which is superior to conventional OPs. If the new OP is deeply integrated with GNSS in our proposed scheme, the 95% SEP for the OD accuracy is 10.0005m, and the time to first fix (TTFF) values under cold and warm start conditions are reduced by at least 7s and 2s respectively, which proves its advantage over loose integration and tight integration.

      PubDate: 2017-07-21T02:12:53Z
      DOI: 10.1016/j.asr.2017.05.041
       
  • FIRE - Flyby of Io with Repeat Encounters: A conceptual design for a New
           Frontiers mission to Io
    • Authors: Terry-Ann Suer; Sebastiano Padovan; Jennifer L. Whitten; Ross W.K. Potter; Svetlana Shkolyar; Morgan Cable; Catherine Walker; Jamey Szalay; Charles Parker; John Cumbers; Diana Gentry; Tanya Harrison; Shantanu Naidu; Harold J. Trammell; Jason Reimuller; Charles J. Budney; Leslie L. Lowes
      Pages: 1080 - 1100
      Abstract: Publication date: 1 September 2017
      Source:Advances in Space Research, Volume 60, Issue 5
      Author(s): Terry-Ann Suer, Sebastiano Padovan, Jennifer L. Whitten, Ross W.K. Potter, Svetlana Shkolyar, Morgan Cable, Catherine Walker, Jamey Szalay, Charles Parker, John Cumbers, Diana Gentry, Tanya Harrison, Shantanu Naidu, Harold J. Trammell, Jason Reimuller, Charles J. Budney, Leslie L. Lowes
      A conceptual design is presented for a low complexity, heritage-based flyby mission to Io, Jupiter’s innermost Galilean satellite and the most volcanically active body in the Solar System. The design addresses the 2011 Decadal Survey’s recommendation for a New Frontiers class mission to Io and is based upon the result of the June 2012 NASA-JPL Planetary Science Summer School. A science payload is proposed to investigate the link between the structure of Io’s interior, its volcanic activity, its surface composition, and its tectonics. A study of Io’s atmospheric processes and Io’s role in the Jovian magnetosphere is also planned. The instrument suite includes a visible/near-IR imager, a magnetic field and plasma suite, a dust analyzer, and a gimbaled high gain antenna to perform radio science. Payload activity and spacecraft operations would be powered by three Advanced Stirling Radioisotope Generators (ASRG). The primary mission includes 10 flybys with close-encounter altitudes as low as 100km. The mission risks are mitigated by ensuring that relevant components are radiation tolerant and by using redundancy and flight-proven parts in the design. The spacecraft would be launched on an Atlas V rocket with a delta-v of 1.3km/s. Three gravity assists (Venus, Earth, Earth) would be used to reach the Jupiter system in a 6-year cruise. The resulting concept demonstrates the rich scientific return of a flyby mission to Io.

      PubDate: 2017-07-21T02:12:53Z
      DOI: 10.1016/j.asr.2017.05.019
       
  • On the timing of the next great solar activity minimum
    • Authors: A.G. Tlatov; A.A. Pevtsov
      Pages: 1108 - 1114
      Abstract: Publication date: 1 September 2017
      Source:Advances in Space Research, Volume 60, Issue 5
      Author(s): A.G. Tlatov, A.A. Pevtsov
      The long-term variations in solar activity are studied using the dataset comprised of sunspot number and 14 C radioisotope timeseries. We use a novel S 200 index to identify possible past Grand Minima (GM). The Maunder, Oort, Wolf and Spörer Minima fall in phase with the minimum of S 200 index. We also show GM develop in clusters, with a separation of about 400–600years between individual GM. Extending these found similarities to modern solar activity, it is predicted that next grand solar minimum may occur in about ∼ 2090 ± 20 .

      PubDate: 2017-07-21T02:12:53Z
      DOI: 10.1016/j.asr.2017.05.009
       
  • Preface: Solar energetic particles, solar modulation and space radiation:
           New opportunities in the AMS-02 Era
    • Authors: Veronica Bindi
      Pages: 753 - 754
      Abstract: Publication date: 15 August 2017
      Source:Advances in Space Research, Volume 60, Issue 4
      Author(s): Veronica Bindi


      PubDate: 2017-07-21T02:12:53Z
      DOI: 10.1016/j.asr.2017.06.013
       
  • 25MeV solar proton events in Cycle 24 and previous cycles
    • Authors: Ian G. Richardson; Tycho T. von Rosenvinge; Hilary V. Cane
      Pages: 755 - 767
      Abstract: Publication date: 15 August 2017
      Source:Advances in Space Research, Volume 60, Issue 4
      Author(s): Ian G. Richardson, Tycho T. von Rosenvinge, Hilary V. Cane
      We summarize observations of around a thousand solar energetic particle (SEP) events since 1967 that include ∼25MeV protons, made by various near-Earth spacecraft (IMPs 4, 5, 7, 8, ISEE 3, SOHO), that encompass Solar Cycle 20 to the current cycle (24). We also discuss recent observations of similar SEP events in Cycle 24 made by the STEREO spacecraft. The observations show, for example, that the time distribution of ∼25MeV proton events varies from cycle to cycle. In particular, the time evolution of the SEP occurrence rate in Cycle 24 is strongly asymmetric between the northern and southern solar hemispheres, and tracks the sunspot number in each hemisphere, whereas Cycle 23 was more symmetric. There was also an absence of 25MeV proton events during the solar minimum preceding Cycle 24 (other minima show occasional, often reasonably intense events). So far, events comparable to the exceptionally intense events detected in Cycles 22 and 23 have not been observed at Earth in Cycle 24, though Cycle 21 (the largest of the cycles considered here) also apparently lacked such events. We note a correlation between the rates of intense 25MeV proton events and “ground level enhancements” (GLEs) observed by neutron monitors, since 1967, and conclude that the number of “official” GLEs (1) observed to date in Cycle 24 appears to be significantly lower than expected (5 to 7±1) based on the rate of intense 25MeV proton events in this cycle.

      PubDate: 2017-07-21T02:12:53Z
      DOI: 10.1016/j.asr.2016.07.035
       
  • Implications of improved measurements of the highest energy SEPs by AMS
           and PAMELA
    • Authors: K. Whitman; V. Bindi; C. Consolandi; C. Corti; B. Yamashiro
      Pages: 768 - 780
      Abstract: Publication date: 15 August 2017
      Source:Advances in Space Research, Volume 60, Issue 4
      Author(s): K. Whitman, V. Bindi, C. Consolandi, C. Corti, B. Yamashiro
      Solar energetic particles (SEP) are a key target of heliophysics research, not only as exemplars of particle acceleration and transport processes that are ubiquitous in astrophysical plasmas, but also as the most intense transient radiation hazard for human and robotic space explorers. SEPs are very well-observed by spacecraft covering particle energies below several hundred MeV/nucleon. Multiple missions, stretching back over decades, have yielded a fairly complete description of SEP intensity, energy spectra, and composition up to a few hundred MeV/nucleon. SEP characteristics at higher energies are, by comparison, only poorly understood due to the relative dearth of high-energy measurements. This lack of high energy measurements has contributed to a disagreement within the heliophysics community regarding the source regions and mechanisms that accelerate particles up to GeV energies. In solar cycle 24, the Payload for Antimatter Matter Exploration and Light-nuclei Astrophysics (PAMELA) and the Alpha Magnetic Spectrometer (AMS) have been taking measurements of the highest energy SEPs from ∼ 100MeV to the GeV. Since the literature has discussed SEP acceleration to GeV energies in terms of Ground Level Enhancements (GLE), we will review the findings for GLEs in solar cycle 23. We will discuss the models and theories that address acceleration up to the GeV and how AMS and PAMELA measurements have the potential to advance the current understanding of SEP acceleration physics. Lastly, only 1–2 GLEs have occurred during solar cycle 24, so we will explore a set of SEP events that were observed in the ⩾100MeV GOES channels, most of which were also observed by PAMELA and AMS.

      PubDate: 2017-07-21T02:12:53Z
      DOI: 10.1016/j.asr.2017.02.042
       
  • Analysis of Ground Level Enhancements (GLE): Extreme solar energetic
           particle events have hard spectra
    • Authors: E. Asvestari; T. Willamo; A. Gil; I.G. Usoskin; G.A. Kovaltsov; V.V. Mikhailov; A. Mayorov
      Pages: 781 - 787
      Abstract: Publication date: 15 August 2017
      Source:Advances in Space Research, Volume 60, Issue 4
      Author(s): E. Asvestari, T. Willamo, A. Gil, I.G. Usoskin, G.A. Kovaltsov, V.V. Mikhailov, A. Mayorov
      Nearly 70 Ground Level Enhancements (GLEs) of cosmic rays have been recorded by the worldwide neutron monitor network since the 1950s depicting a big variety of energy spectra of solar energetic particles (SEP). Here we studied a statistical relation between the event-integrated intensity of GLEs (calculated as count-rate relative excess, averaged over all available polar neutron monitors, and expressed in percent-hours) and the hardness of the solar particle energy spectra. For each event the integral omnidirectional event-integrated fluences of particles with energy above 30MeV ( F 30 ) and above 200MeV ( F 200 ) were computed using the reconstructed spectra, and the ratio between the two fluences was considered as a simple index of the event’s hardness. We also provided a justification of the spectrum estimate in the form of the Band-function, using direct PAMELA data for GLE 71 (17-May-2012). We found that, while there is no clear relation between the intensity and the hardness for weak events, all strong events with the intensity greater 100%∗h are characterized by a very hard spectrum. This implies that a hard spectrum can be securely assumed for all extreme GLE events, e.g., those studied using cosmogenic isotope data in the past.

      PubDate: 2017-07-21T02:12:53Z
      DOI: 10.1016/j.asr.2016.08.043
       
  • Geomagnetically trapped, albedo and solar energetic particles: Trajectory
           analysis and flux reconstruction with PAMELA
    • Authors: A. Bruno; O. Adriani; G.C. Barbarino; G.A. Bazilevskaya; R. Bellotti; M. Boezio; E.A. Bogomolov; M. Bongi; V. Bonvicini; S. Bottai; F. Cafagna; D. Campana; P. Carlson; M. Casolino; G. Castellini; E.C. Christian; C. De Donato; G.A. de Nolfo; C. De Santis; N. De Simone; V. Di Felice; A.M. Galper; A.V. Karelin; S.V. Koldashov; S. Koldobskiy; S.Y. Krutkov; A.N. Kvashnin; A. Leonov; V. Malakhov; L. Marcelli; M. Martucci; A.G. Mayorov; W. Menn; M. Mergè; V.V. Mikhailov; E. Mocchiutti; A. Monaco; N. Mori; R. Munini; G. Osteria; F. Palma; B. Panico; P. Papini; M. Pearce; P. Picozza; M. Ricci; S.B. Ricciarini; J.M. Ryan; R. Sarkar; V. Scotti; M. Simon; R. Sparvoli; P. Spillantini; S. Stochaj; Y.I. Stozhkov; A. Vacchi; E. Vannuccini; G.I. Vasilyev; S.A. Voronov; Y.T. Yurkin; G. Zampa; N. Zampa
      Pages: 788 - 795
      Abstract: Publication date: 15 August 2017
      Source:Advances in Space Research, Volume 60, Issue 4
      Author(s): A. Bruno, O. Adriani, G.C. Barbarino, G.A. Bazilevskaya, R. Bellotti, M. Boezio, E.A. Bogomolov, M. Bongi, V. Bonvicini, S. Bottai, F. Cafagna, D. Campana, P. Carlson, M. Casolino, G. Castellini, E.C. Christian, C. De Donato, G.A. de Nolfo, C. De Santis, N. De Simone, V. Di Felice, A.M. Galper, A.V. Karelin, S.V. Koldashov, S. Koldobskiy, S.Y. Krutkov, A.N. Kvashnin, A. Leonov, V. Malakhov, L. Marcelli, M. Martucci, A.G. Mayorov, W. Menn, M. Mergè, V.V. Mikhailov, E. Mocchiutti, A. Monaco, N. Mori, R. Munini, G. Osteria, F. Palma, B. Panico, P. Papini, M. Pearce, P. Picozza, M. Ricci, S.B. Ricciarini, J.M. Ryan, R. Sarkar, V. Scotti, M. Simon, R. Sparvoli, P. Spillantini, S. Stochaj, Y.I. Stozhkov, A. Vacchi, E. Vannuccini, G.I. Vasilyev, S.A. Voronov, Y.T. Yurkin, G. Zampa, N. Zampa
      The PAMELA satellite experiment is providing comprehensive observations of the interplanetary and magnetospheric radiation in the near-Earth environment. Thanks to its identification capabilities and the semi-polar orbit, PAMELA is able to precisely measure the energetic spectra and the angular distributions of the different cosmic-ray populations over a wide latitude region, including geomagnetically trapped and albedo particles. Its observations comprise the solar energetic particle events between solar cycles 23 and 24, and the geomagnetic cutoff variations during magnetospheric storms. PAMELA’s measurements are supported by an accurate analysis of particle trajectories in the Earth’s magnetosphere based on a realistic geomagnetic field modeling, which allows the classification of particle populations of different origin and the investigation of the asymptotic directions of arrival.

      PubDate: 2017-07-21T02:12:53Z
      DOI: 10.1016/j.asr.2016.06.042
       
  • Analysis of proton and electron spectra observed by EPT/PROBA-V in the
           South Atlantic Anomaly
    • Authors: G. López Rosson; V. Pierrard
      Pages: 796 - 805
      Abstract: Publication date: 15 August 2017
      Source:Advances in Space Research, Volume 60, Issue 4
      Author(s): G. López Rosson, V. Pierrard
      Proton and electron spectra observed by the Energetic Particle Telescope (EPT) on board the ESA satellite PROBA-V have been investigated at different locations in the South Atlantic Anomaly (SAA). The EPT spectrometer provides high-resolution measurements of the charged particle radiation environment in space performing with direct electron, proton and heavy ion discrimination. Dividing the SAA into 5 different bins of 5°×5° each one for protons, we obtain that the average proton spectra have often similar slopes, but greatly differ from one location to another. The highest fluxes are generally located in the North of the SAA. For some energy ranges and time periods, the South of the SAA shows different shapes, indicating different sources for the North and South populations of the SAA. Electron spectra show very low fluxes of energetic electrons, often lower than what is provided by the model AE8.

      PubDate: 2017-07-21T02:12:53Z
      DOI: 10.1016/j.asr.2017.03.022
       
  • The results from BESS-Polar experiment
    • Authors: K. Abe; H. Fuke; S. Haino; T. Hams; M. Hasegawa; K.C. Kim; M.H. Lee; Y. Makida; J.W. Mitchell; J. Nishimura; M. Nozaki; R. Orito; J.F. Ormes; N. Picot-Clemente; K. Sakai; M. Sasaki; E.S. Seo; R.E. Streitmatter; J. Suzuki; K. Tanaka; N. Thakur; A. Yamamoto; T. Yoshida; K. Yoshimura
      Pages: 806 - 814
      Abstract: Publication date: 15 August 2017
      Source:Advances in Space Research, Volume 60, Issue 4
      Author(s): K. Abe, H. Fuke, S. Haino, T. Hams, M. Hasegawa, K.C. Kim, M.H. Lee, Y. Makida, J.W. Mitchell, J. Nishimura, M. Nozaki, R. Orito, J.F. Ormes, N. Picot-Clemente, K. Sakai, M. Sasaki, E.S. Seo, R.E. Streitmatter, J. Suzuki, K. Tanaka, N. Thakur, A. Yamamoto, T. Yoshida, K. Yoshimura
      The balloon-borne experiment with a superconducting spectrometer (BESS) instrument was developed as a high-resolution, high-geometric-acceptance magnetic-rigidity spectrometer for sensitive measurements of cosmic-ray antiparticles, searches for antinuclei, and precise measurements of the absolute fluxes of light GCR elements and isotopes. The original BESS experiment flew 8 times over Lynn Lake, Canada and once from Fort Sumner, USA during the period of 1993 through 2002, with continuous improvement in the instrument. Based on the instrument concept inherited from the BESS spectrometer, a very low instrumental energy cutoff for antiprotons was achieved with a new thin-walled superconducting magnet and removal of the outer pressure vessel for BESS-Polar project. The first and second scientific flights called BESS-Polar I/II were successfully performed, over Antarctica in 2004 December and 2007 December respectively. We report the scientific results, focusing on the long-duration flights of BESS-Polar I (2004) and BESS-Polar II (2007–2008).

      PubDate: 2017-07-21T02:12:53Z
      DOI: 10.1016/j.asr.2016.11.004
       
  • Testing universality of cosmic-ray acceleration with proton/helium data
           from AMS and Voyager-1
    • Authors: Nicola Tomassetti
      Pages: 815 - 825
      Abstract: Publication date: 15 August 2017
      Source:Advances in Space Research, Volume 60, Issue 4
      Author(s): Nicola Tomassetti
      The Alpha Magnetic Spectrometer (AMS) experiment onboard the International Space Station (ISS) has recently measured the proton and helium spectra in cosmic rays (CRs) in the GeV-TeV energy region. The spectra of proton and helium are found to progressively harden at rigidity R = pc / Ze ≳ 200 GV, while the proton-to-helium ratio as function of rigidity is found to fall off steadily as p/He ∝ R - 0.08 . The decrease of the p/He ratio is often interpreted in terms of particle-dependent acceleration, which is in contrast with the universal nature of diffusive-shock-acceleration mechanisms. A different explanation is that the p-He anomaly originates from a flux transition between two components: a sub-TeV flux component (L) provided by hydrogen-rich supernova remnants with soft acceleration spectra, and a multi-TeV component (G) injected by younger sources with amplified magnetic fields and hard spectra. In this scenario the universality of particle acceleration is not violated because both source components provide composition-blind injection spectra. The present work is aimed at testing the universality of CR acceleration using the low-energy part of the CR flux, which is expected to be dominated by the L-type component. However, at kinetic energy of ∼0.5–10GeV, the CR fluxes are significantly affected by energy losses and solar modulation, hence a proper modeling of Galactic and heliospheric propagation is required. To set the key properties of the L-source component, I have used the Voyager-1 data collected in the interstellar space. To compare my calculations with the AMS data, I have performed a determination of the force-field modulation parameter using neutron monitor measurements. I will show that the recent p-He data reported by AMS and Voyager-1 are in good agreement with the predictions of such a scenario, supporting the hypothesis that CRs are released in the Galaxy by universal, composition-blind accelerators. At energies below ∼0.5GeV/n, however, the model is found to underpredict the data collected by PAMELA from 2006 to 2010. This discrepancy is found to increase with increasing solar activity, reflecting an expected breakdown of the force-field approximation.

      PubDate: 2017-07-21T02:12:53Z
      DOI: 10.1016/j.asr.2016.10.024
       
  • Voyager observations in the distant heliosheath: An analogy with ISEE-3
           observations in the deep geomagnetic tail
    • Authors: Ian G. Richardson
      Pages: 826 - 832
      Abstract: Publication date: 15 August 2017
      Source:Advances in Space Research, Volume 60, Issue 4
      Author(s): Ian G. Richardson
      We suggest an analogy between energetic particle and magnetic field observations made by the Voyager 1 spacecraft in the distant heliosheath at 122 AU in August 2012, and those made in the distant geomagnetic tail by the ISEE 3 spacecraft in 1982–1983, despite large differences in the time and distance scales. The analogy suggests that in August, 2012, Voyager 1 may not have moved from the anomalous cosmic ray (ACR)-dominated heliosheath into the interstellar medium but into a region equivalent to the “lobes” of the geomagnetic tail, composed of heliospheric field lines which have reconnected with the interstellar medium beyond the spacecraft and so are open to the entry of cosmic rays, while heliospheric particles (e.g., ACRs) are free to escape, and which maintain a ∼Parker spiral configuration. The heliopause, analogous to the magnetopause forming the outer boundary of the lobes, may then lie beyond this so-called “heliocliff”. Even if this analogy is incorrect, the remarkable similarities between the energetic particle and magnetic field observations in these very different regions are worth noting.

      PubDate: 2017-07-21T02:12:53Z
      DOI: 10.1016/j.asr.2016.03.032
       
  • Neutron monitors and muon detectors for solar modulation studies: 2.
           ϕ time series
    • Authors: A. Ghelfi; D. Maurin; A. Cheminet; L. Derome; G. Hubert; F. Melot
      Pages: 833 - 847
      Abstract: Publication date: 15 August 2017
      Source:Advances in Space Research, Volume 60, Issue 4
      Author(s): A. Ghelfi, D. Maurin, A. Cheminet, L. Derome, G. Hubert, F. Melot
      The level of solar modulation at different times (related to the solar activity) is a central question of solar and galactic cosmic-ray physics. In the first paper of this series, we have established a correspondence between the uncertainties on ground-based detectors count rates and the parameter ϕ (modulation level in the force-field approximation) reconstructed from these count rates. In this second paper, we detail a procedure to obtain a reference ϕ time series from neutron monitor data. We show that we can have an unbiased and accurate ϕ reconstruction ( Δ ϕ / ϕ ≃ 10 % ). We also discuss the potential of Bonner spheres spectrometers and muon detectors to provide ϕ time series. Two by-products of this calculation are updated ϕ values for the cosmic-ray database and a web interface to retrieve and plot ϕ from the 50’s to today (http://lpsc.in2p3.fr/crdb).

      PubDate: 2017-07-21T02:12:53Z
      DOI: 10.1016/j.asr.2016.06.027
       
  • The global modulation of cosmic rays during a quiet heliosphere: A
           modeling perspective
    • Authors: M.S. Potgieter
      Pages: 848 - 864
      Abstract: Publication date: 15 August 2017
      Source:Advances in Space Research, Volume 60, Issue 4
      Author(s): M.S. Potgieter
      A perspective is given of the solar modulation of galactic cosmic rays in the heliosphere during the extraordinary quiet solar minimum period from 2006 to 2009. This is done in the context of the total modulation of cosmic rays in a global heliosphere. Such an approach has become possible since the observation of galactic cosmic rays made beyond the heliopause by Voyager 1 so that together with very precise observations at higher energies at the Earth, more reliable local interstellar spectra can be established. Combined with the results from comprehensive modeling, a global view unfolds. The requirements for such an approach to the modeling of solar modulation are discussed. Computed, modulated spectra for protons and electrons are shown, for 2006–2009 together with computed radial and latitudinal gradients for protons, in comparison with observations where available. Predictions are made for the energy ranges not covered by the 2006–2009 observations. Respectively, the modulation factor for protons, electrons and positrons are given for energies as low as 5MeV for the mentioned period. The computed electron to positron ratio is presented as applicable to solar minimum modulation conditions. The differences in the modulation of protons, electrons and positrons are illustrated for such conditions and the main contributions to this global process, including particle drifts, are discussed.

      PubDate: 2017-07-21T02:12:53Z
      DOI: 10.1016/j.asr.2016.09.003
       
  • Overview of galactic cosmic ray solar modulation in the AMS-02 era
    • Authors: V. Bindi; C. Corti; C. Consolandi; J. Hoffman; K. Whitman
      Pages: 865 - 878
      Abstract: Publication date: 15 August 2017
      Source:Advances in Space Research, Volume 60, Issue 4
      Author(s): V. Bindi, C. Corti, C. Consolandi, J. Hoffman, K. Whitman
      A new era in cosmic rays physics has started thanks to the precise and continuous observations from space experiments such as PAMELA and AMS-02. Invaluable results are coming out from these new data that are rewriting the theory of acceleration and propagation of cosmic rays. Both at high energies, where several new behaviors have been measured, challenging the accuracy of theoretical models, and also at low energies, in the region affected by the solar modulation. Precise measurements are increasing our knowledge of the effects of solar modulation on low energy cosmic rays, allowing a detailed study of propagation and composition as it has never been done before. These measurements will serve as a high-precision baseline for continued studies of GCR composition, GCR modulation over the solar cycle, space radiation hazards, and other topics. In this review paper, the status of the latest measurements of the cosmic rays in the context of solar modulation are presented together with the current open questions and the future prospects. How new measurements from the AMS-02 experiment will address these questions is also discussed.

      PubDate: 2017-07-21T02:12:53Z
      DOI: 10.1016/j.asr.2017.05.025
       
  • Robust double gain unscented Kalman filter for small satellite attitude
           estimation
    • Authors: Lu Cao; Weiwei Yang; Hengnian Li; Zhidong Zhang; Jianjun Shi
      Pages: 499 - 512
      Abstract: Publication date: 1 August 2017
      Source:Advances in Space Research, Volume 60, Issue 3
      Author(s): Lu Cao, Weiwei Yang, Hengnian Li, Zhidong Zhang, Jianjun Shi
      Limited by the low precision of small satellite sensors, the estimation theories with high performance remains the most popular research topic for the attitude estimation. The Kalman filter (KF) and its extensions have been widely applied in the satellite attitude estimation and achieved plenty of achievements. However, most of the existing methods just take use of the current time-step’s priori measurement residuals to complete the measurement update and state estimation, which always ignores the extraction and utilization of the previous time-step’s posteriori measurement residuals. In addition, the uncertainty model errors always exist in the attitude dynamic system, which also put forward the higher performance requirements for the classical KF in attitude estimation problem. Therefore, the novel robust double gain unscented Kalman filter (RDG-UKF) is presented in this paper to satisfy the above requirements for the small satellite attitude estimation with the low precision sensors. It is assumed that the system state estimation errors can be exhibited in the measurement residual; therefore, the new method is to derive the second Kalman gain K k 2 for making full use of the previous time-step’s measurement residual to improve the utilization efficiency of the measurement data. Moreover, the sequence orthogonal principle and unscented transform (UT) strategy are introduced to robust and enhance the performance of the novel Kalman Filter in order to reduce the influence of existing uncertainty model errors. Numerical simulations show that the proposed RDG-UKF is more effective and robustness in dealing with the model errors and low precision sensors for the attitude estimation of small satellite by comparing with the classical unscented Kalman Filter (UKF).

      PubDate: 2017-06-27T03:36:18Z
      DOI: 10.1016/j.asr.2017.03.014
       
  • Estimation of inertial characteristics of tumbling spacecraft using
           constant state filter
    • Authors: Chuan Ma; Honghua Dai; Jianping Yuan
      Pages: 513 - 530
      Abstract: Publication date: 1 August 2017
      Source:Advances in Space Research, Volume 60, Issue 3
      Author(s): Chuan Ma, Honghua Dai, Jianping Yuan
      Reconstruction of dynamical parameters is one of the main challenges faced in the on-orbit servicing missions for defunct spacecraft. And the quaternion plays a major role in parameterizations of the dynamical model. In this paper, the analytical solution of the quaternion differential equations of a tumbling symmetrical object is derived. Given this solution, a constant state filter is proposed for inertial characteristics estimation and attitude prediction of tumbling spacecraft. The key idea of the present filter is to replace dynamic variables by the undetermined constant parameters of the analytical solution. These parameters are estimated during the filtering process and then used to calculate the dynamic variables of the spacecraft. Furthermore, they are also utilized to determine the inertial characteristics and predict the future attitude motions. Compared with traditional EKFs, the constant state filter shows good performance when the measurement sampling interval is large or a priori estimation of the state is unavailable, because the dynamic model and observation model are transformed into approximate linear forms by utilizing the constant state vector. Numerical simulations verify the convergence and precision of the proposed filter.

      PubDate: 2017-06-27T03:36:18Z
      DOI: 10.1016/j.asr.2017.03.032
       
  • Scoring sensor observations to facilitate the exchange of space
           surveillance data
    • Authors: M. Weigel; H. Fiedler; T. Schildknecht
      Pages: 531 - 542
      Abstract: Publication date: 1 August 2017
      Source:Advances in Space Research, Volume 60, Issue 3
      Author(s): M. Weigel, H. Fiedler, T. Schildknecht
      In this paper, a scoring metric for space surveillance sensor observations is introduced. A scoring metric allows for direct comparison of data quantity and data quality, and makes transparent the effort made by different sensor operators. The concept might be applied to various sensor types like tracking and surveillance radar, active optical laser tracking, or passive optical telescopes as well as combinations of different measurement types. For each measurement type, a polynomial least squares fit is performed on the measurement values contained in the track. The track score is the average sum over the polynomial coefficients uncertainties and scaled by reference measurement accuracy. Based on the newly developed scoring metric, an accounting model and a rating model are introduced. Both models facilitate the exchange of observation data within a network of space surveillance sensors operators. In this paper, optical observations are taken as an example for analysis purposes, but both models can also be utilized for any other type of observations. The rating model has the capability to distinguish between network participants with major and minor data contribution to the network. The level of sanction on data reception is defined by the participants themselves enabling a high flexibility. The more elaborated accounting model translates the track score to credit points earned for data provision and spend for data reception. In this model, data reception is automatically limited for participants with low contribution to the network. The introduced method for observation scoring is first applied for transparent data exchange within the Small Aperture Robotic Telescope Network (SMARTnet). Therefore a detailed mathematical description is presented for line of sight measurements from optical telescopes, as well as numerical simulations for different network setups.

      PubDate: 2017-06-27T03:36:18Z
      DOI: 10.1016/j.asr.2017.04.010
       
  • New fundamental parameters for attitude representation
    • Authors: Russell P. Patera
      Pages: 557 - 570
      Abstract: Publication date: 1 August 2017
      Source:Advances in Space Research, Volume 60, Issue 3
      Author(s): Russell P. Patera
      A new attitude parameter set is developed to clarify the geometry of combining finite rotations in a rotational sequence and in combining infinitesimal angular increments generated by angular rate. The resulting parameter set of six Pivot Parameters represents a rotation as a great circle arc on a unit sphere that can be located at any clocking location in the rotation plane. Two rotations are combined by linking their arcs at either of the two intersection points of the respective rotation planes. In a similar fashion, linking rotational increments produced by angular rate is used to derive the associated kinematical equations, which are linear and have no singularities. Included in this paper is the derivation of twelve Pivot Parameter elements that represent all twelve Euler Angle sequences, which enables efficient conversions between Pivot Parameters and any Euler Angle sequence. Applications of this new parameter set include the derivation of quaternions and the quaternion composition rule, as well as, the derivation of the analytical solution to time dependent coning motion. The relationships between Pivot Parameters and traditional parameter sets are included in this work. Pivot Parameters are well suited for a variety of aerospace applications due to their effective composition rule, singularity free kinematic equations, efficient conversion to and from Euler Angle sequences and clarity of their geometrical foundation.

      PubDate: 2017-06-27T03:36:18Z
      DOI: 10.1016/j.asr.2017.04.024
       
  • Polarimetric SAR Interferometry based modeling for tree height and
           aboveground biomass retrieval in a tropical deciduous forest
    • Authors: Shashi Kumar; Unmesh G. Khati; Shreya Chandola; Shefali Agrawal; Satya P.S. Kushwaha
      Pages: 571 - 586
      Abstract: Publication date: 1 August 2017
      Source:Advances in Space Research, Volume 60, Issue 3
      Author(s): Shashi Kumar, Unmesh G. Khati, Shreya Chandola, Shefali Agrawal, Satya P.S. Kushwaha
      The regulation of the carbon cycle is a critical ecosystem service provided by forests globally. It is, therefore, necessary to have robust techniques for speedy assessment of forest biophysical parameters at the landscape level. It is arduous and time taking to monitor the status of vast forest landscapes using traditional field methods. Remote sensing and GIS techniques are efficient tools that can monitor the health of forests regularly. Biomass estimation is a key parameter in the assessment of forest health. Polarimetric SAR (PolSAR) remote sensing has already shown its potential for forest biophysical parameter retrieval. The current research work focuses on the retrieval of forest biophysical parameters of tropical deciduous forest, using fully polarimetric spaceborne C-band data with Polarimetric SAR Interferometry (PolInSAR) techniques. PolSAR based Interferometric Water Cloud Model (IWCM) has been used to estimate aboveground biomass (AGB). Input parameters to the IWCM have been extracted from the decomposition modeling of SAR data as well as PolInSAR coherence estimation. The technique of forest tree height retrieval utilized PolInSAR coherence based modeling approach. Two techniques – Coherence Amplitude Inversion (CAI) and Three Stage Inversion (TSI) – for forest height estimation are discussed, compared and validated. These techniques allow estimation of forest stand height and true ground topography. The accuracy of the forest height estimated is assessed using ground-based measurements. PolInSAR based forest height models showed enervation in the identification of forest vegetation and as a result height values were obtained in river channels and plain areas. Overestimation in forest height was also noticed at several patches of the forest. To overcome this problem, coherence and backscatter based threshold technique is introduced for forest area identification and accurate height estimation in non-forested regions. IWCM based modeling for forest AGB retrieval showed R2 value of 0.5, RMSE of 62.73 (t ha−1) and a percent accuracy of 51%. TSI based PolInSAR inversion modeling showed the most accurate result for forest height estimation. The correlation between the field measured forest height and the estimated tree height using TSI technique is 62% with an average accuracy of 91.56% and RMSE of 2.28m. The study suggested that PolInSAR coherence based modeling approach has significant potential for retrieval of forest biophysical parameters.

      PubDate: 2017-06-27T03:36:18Z
      DOI: 10.1016/j.asr.2017.04.018
       
  • Autonomous rock detection on mars through region contrast
    • Authors: Xueming Xiao; Hutao Cui; Meibao Yao; Yang Tian
      Pages: 626 - 635
      Abstract: Publication date: 1 August 2017
      Source:Advances in Space Research, Volume 60, Issue 3
      Author(s): Xueming Xiao, Hutao Cui, Meibao Yao, Yang Tian
      In this paper, we present a new autonomous rock detection approach through region contrast. Unlike current state-of-art pixel-level rock segmenting methods, new method deals with this issue in region level, which will significantly reduce the computational cost. Image is firstly splitted into homogeneous regions based on intensity information and spatial layout. Considering the high-water memory constraints of onboard flight processor, only low-level features, average intensity and variation of superpixel, are measured. Region contrast is derived as the integration of intensity contrast and smoothness measurement. Rocks are then segmented from the resulting contrast map by an adaptive threshold. Since the merely intensity-based method may cause false detection in background areas with different illuminations from surroundings, a more reliable method is further proposed by introducing spatial factor and background similarity to the region contrast. Spatial factor demonstrates the locality of contrast, while background similarity calculates the probability of each subregion belonging to background. Our method is efficient in dealing with large images and only few parameters are needed. Preliminary experimental results show that our algorithm outperforms edge-based methods in various grayscale rover images.

      PubDate: 2017-06-27T03:36:18Z
      DOI: 10.1016/j.asr.2017.04.028
       
  • Effect of grain size distribution on stress-strain behavior of lunar soil
           simulants
    • Authors: Mehmet Murat Monkul; Amina Dacic
      Pages: 636 - 651
      Abstract: Publication date: 1 August 2017
      Source:Advances in Space Research, Volume 60, Issue 3
      Author(s): Mehmet Murat Monkul, Amina Dacic
      Geotechnical behavior of the lunar soils is important for engineering analyses regarding various aspects of the future extraterrestrial settlement plans including lunar exploration and construction. Many lunar soil simulants had been produced so far, in order to resemble lunar soils and conduct such analyses. The goal of this study is to investigate how and to what extent the variations in the grain size distribution of different lunar soil simulants affect their shear strength and volume change behaviors, both of which are quite important for constitutive modeling and geotechnical design. Static simple shear tests were conducted on four lunar soil simulants that were reproduced in terms of original gradation characteristics. The results indicate that various gradational parameters, such as mean grain size, coefficient of uniformity and fines content influence the shear strength, the amount of volumetric dilatancy, and the rate of dilatancy of simulant specimens in different levels when they were compared at the same density or void ratio. The possible reasons behind such different levels of influence were also discussed by focusing on the initial fabric of specimens achieved before shearing and the interaction between silt and sand matrices in the simulants.

      PubDate: 2017-06-27T03:36:18Z
      DOI: 10.1016/j.asr.2017.04.029
       
  • Latitudinal and MLT dependence of the seasonal variation of geomagnetic
           field around auroral zone
    • Authors: Jin Zhu; Aimin Du; Jiaming Ou; Wenyao Xu
      Pages: 667 - 676
      Abstract: Publication date: 1 August 2017
      Source:Advances in Space Research, Volume 60, Issue 3
      Author(s): Jin Zhu, Aimin Du, Jiaming Ou, Wenyao Xu
      Seasonal variation of geomagnetic field around auroral zone is analyzed in terms of geomagnetic latitude, magnetic local time (MLT) and geomagnetic condition in this study. The study uses horizontal component (H) of geomagnetic field obtained from 6 observatories located in geomagnetic latitude of 57.8°N–73.8°N along 115°E longitudinal line. The results indicate that seasonal variations of geomagnetic field around auroral zone are different combinations of annual and semiannual variations at different latitudinal ranges. Both annual and semiannual variations show distinct MLT dependency: (1) At dayside auroral latitudes (around 72°N geomagnetic latitude), geomagnetic field shows distinct annual variation under both quiet and disturbed conditions. Furthermore, the annual component is mainly contributed by data of dusk sector. (2) At nightside auroral latitudes (around 65°N), geomagnetic field shows semiannual dominated seasonal variation. Under quiet conditions the annual component is comparable to the semiannual component, while under disturbed conditions, the semiannual component is twice as much as the annual component. Under quiet conditions, the semiannual component is mainly contributed by 1300–1400 MLT, while the annual component has two peaks: one is around 1100–1300 MLT and the other is around 2000–2200 MLT. Under disturbed conditions, the semiannual component is mainly contributed by data around midnight, while the annual component is mainly contributed by dusk sector. (3) At subauroral latitudes (around 60°N), annual variation is comparable to semiannual variation under both quiet and disturbed conditions. Both annual and semiannual components show similar MLT dependencies as that of nightside auroral latitudes.

      PubDate: 2017-06-27T03:36:18Z
      DOI: 10.1016/j.asr.2017.04.022
       
  • Ingestion of FORMOSAT-3/COSMIC GPS data into La Plata Ionospheric Model: A
           preliminary assessment
    • Authors: J. Federico Conte; Claudio Brunini
      Pages: 677 - 691
      Abstract: Publication date: 1 August 2017
      Source:Advances in Space Research, Volume 60, Issue 3
      Author(s): J. Federico Conte, Claudio Brunini
      La Plata Ionospheric Model (LPIM; Brunini et al., 2011) has been upgraded to a new stage enabling the ingestion of sTEC values retrieved from GPS receivers on board the FORMOSAT-3 Constellation Observing System for Meteorology, Ionosphere and Climate (COSMIC) satellites, in order to determine corrections to the global mean values of the ionosphere F2 layer critical frequency, f o F 2 (related to the peak density, N m F 2 ) and the F2 layer peak height, h m F 2 . Once the corrections were computed, La Plata Ionospheric Model determined new f o F 2 and h m F 2 values which were used to reproduce ionospheric electron density profiles depending on Universal Time, geographical coordinates, and solar and geomagnetic activity levels. These new profiles were compared with those obtained using LPIM but without COSMIC-GPS data ingestion and against International Reference Ionosphere (IRI) profiles; while the new values of the F2 peak parameters were compared with ionosonde measurements. These comparisons served to show that the incorporation of COSMIC-GPS data seems to provide LPIM with a better capability to render a more reliable representation of the F2 layer of the ionosphere. Consequently, results of the data ingestion process, as well as intra-technique and against IRI and observations comparisons are described, and general conclusions are presented. The most important being that: • Without data ingestion LPIM tends to overestimate N m F 2 and to slightly underestimate h m F 2 . • LPIM has improved its representation of the F2 peak of the ionosphere.

      PubDate: 2017-06-27T03:36:18Z
      DOI: 10.1016/j.asr.2017.04.025
       
  • Mars entry guidance based on an adaptive reference drag profile
    • Authors: Zixuan Liang; Guangfei Duan; Zhang Ren
      Pages: 692 - 701
      Abstract: Publication date: 1 August 2017
      Source:Advances in Space Research, Volume 60, Issue 3
      Author(s): Zixuan Liang, Guangfei Duan, Zhang Ren
      The conventional Mars entry tracks a fixed reference drag profile (FRDP). To improve the landing precision, a novel guidance approach that utilizes an adaptive reference drag profile (ARDP) is presented. The entry flight is divided into two phases. For each phase, a family of drag profiles corresponding to various trajectory lengths is planned. Two update windows are investigated for the reference drag profile. At each window, the ARDP is selected online from the profile database according to the actual range-to-go. The tracking law for the selected drag profile is designed based on the feedback linearization. Guidance approaches using the ARDP and the FRDP are then tested and compared. Simulation results demonstrate that the proposed ARDP approach achieves much higher guidance precision than the conventional FRDP approach.

      PubDate: 2017-06-27T03:36:18Z
      DOI: 10.1016/j.asr.2017.04.027
       
  • List of Referees
    • Abstract: Publication date: 1 September 2017
      Source:Advances in Space Research, Volume 60, Issue 5


      PubDate: 2017-07-21T02:12:53Z
       
  • List of Referees
    • Abstract: Publication date: 15 August 2017
      Source:Advances in Space Research, Volume 60, Issue 4


      PubDate: 2017-07-21T02:12:53Z
       
 
 
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