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Journal Cover   International Journal of Space Science and Engineering
  [2 followers]  Follow
   Hybrid Journal Hybrid journal (It can contain Open Access articles)
   ISSN (Print) 2048-8459 - ISSN (Online) 2048-8467
   Published by Inderscience Publishers Homepage  [403 journals]
  • GPS-based orbital filter to reach the moon
    • Pages: 199 - 218
      Abstract: Nowadays, global navigation satellite systems (GNSSs) are used for many new applications that go further than the original goal of providing position, velocity and timing for land, maritime and air applications. In particular, GNSS receivers have been adopted as main navigation system for several low Earth orbits (LEOs) missions, increasing the autonomy of the hosting spacecraft, reducing the networking operation costs. Accordingly, they result in an attractive solution even for higher Earth orbits. However, although many studies have shown that GNSS observations can also be obtained at altitudes above the GNSS constellations by using high sensitivity receivers, the use of these signals is still challenging because of their very weak power and the poor relative geometry between the receiver and the transmitters. In this paper, we describe the implementation of an orbital filter specifically designed for moon missions, which aims to improve the navigation performance achievable when using GNSS observations.
      Keywords: global navigation satellite systems; GNSSs; highly elliptical orbit; HEO; moon transfer orbit; MTO; global positioning systems; GPS; orbital filter; Kalman filter; moon missions; navigation performance; GNSS observations
      Citation: International Journal of Space Science and Engineering, Vol. 3, No. 3 (2015) pp. 199 - 218
      PubDate: 2015-11-27T23:20:50-05:00
      DOI: 10.1504/IJSPACESE.2015.073216
      Issue No: Vol. 3, No. 3 (2015)
  • A performance enhanced transmission control protocol for
           inter-planetary networks
    • Authors: Sangita Dhara, Raja Datta, Kalyankumar Bandyopadhyay
      Pages: 219 - 245
      Abstract: Activities in deep space have prompted researchers to develop new protocols for inter-planetary network. In this paper, we propose a performance enhanced inter-planetary transmission control protocol (IP-TCP) for deep space communication. IP-TCP opens multiple parallel TCP connections to transfer a number of TCP segments simultaneously over a single physical link. We have developed theoretical models to understand the performance of IP-TCP with regard to long RTT, asymmetric bandwidth and high bit error rate comparable to deep space environment. Through simulations we evaluate the proposed protocol considering RTT values typically seen in Mars exploration networks under different conditions of packet error rates. We observe that the IP-TCP outperforms few popular existing protocols which are also extensions of terrestrial TCP.
      Keywords: inter-planetary networks; IPN; transmission control protocol; TCP connections; round trip time; RTT; packet error rate; PER; deep space communication; transport layer; deep space communication; theoretical modelling; asymmetric bandwidth; bit error rate; BER; s
      Citation: International Journal of Space Science and Engineering, Vol. 3, No. 3 (2015) pp. 219 - 245
      PubDate: 2015-11-27T23:20:50-05:00
      DOI: 10.1504/IJSPACESE.2015.073213
      Issue No: Vol. 3, No. 3 (2015)
  • LMI-based control law for variable-speed control moment gyros in
           flexible spacecraft
    • Authors: Shinya Kasai, Hirohisa Kojima
      Pages: 246 - 278
      Abstract: A linear matrix inequality (LMI)-based control law for variable-speed control moment gyros (VSCMGs) for flexible spacecraft is proposed in this study. This proposed control law is designed by H∞ synthesis via LMI, considering the characteristics of the VSCMG system, the reaction wheel (RW), and vibration suppression. However, this proposed control law should be applied near the end of a manoeuvre because the control moment gyro (CMG) system is nonlinear and the proposed controller is a linear controller based on H∞ synthesis. In this study, to smoothly transition between the CMG and RW modes, the steering control law is designed as a gain-scheduled steering control law for the VSCMGs, which consists of the generalised singularity-robust term and the local gradient-based (LG) null motion term for the VSCMGs before the end of the manoeuvre. The numerical results show that the proposed steering law can effectively stabilise the attitude and suppress vibration.
      Keywords: variable-speed CMGs; control moment gyros; VSCMGs; H-infinity control; linear matrix inequalities; LMIs; steering control law; flexible spacecraft; reaction wheel; vibration suppression; attitude stability
      Citation: International Journal of Space Science and Engineering, Vol. 3, No. 3 (2015) pp. 246 - 278
      PubDate: 2015-11-27T23:20:50-05:00
      DOI: 10.1504/IJSPACESE.2015.073215
      Issue No: Vol. 3, No. 3 (2015)
  • Analytical studies to visualise the geomagnetic storm conditions over
           different locations in the USA: Part 1
    • Authors: Shinya Kasai, Hirohisa Kojima
      Pages: 279 - 294
      Abstract: Geomagnetic storms may trigger various risk-prone atmospheric and oceanic phenomena which may impart serious health hazards to the inhabitants of the biosphere too. Accordingly, the A-index data obtained from the US Department of Commerce, NOAA, Space Weather Prediction Center, for the time period started from 1994 to 2013, are analysed statistically to visualise the geomagnetic conditions over Fredericksburg (38.2047°N, 77.3729°W), College (64.8742°N, 147.8597°W) and Estimated Planetary in USA. Percentage occurrence of six different geomagnetic conditions namely quiet, unsettled, active, minor storm, major storm and severe storm are estimated for 12 different months over these different locations. The obtained results describe the sensitivity of these locations for the occurrence of geo-magnetic storms. These fruitful information may be useful in communication, navigation, civil-aviation, medical-science etc. Finally, these results can be used to adopt precaution to save various precious electrical and electro-magnetic systems, from getting effected and destroyed due to these high energetic geomagnetic storms.
      Keywords: percentage occurrence; A-indices; geomagnetic storms; USA; United States; visualisation; health hazards; geomagnetic conditions; electrical systems; electromagnetic systems; statistical analysis; Space Weather Prediction Center
      Citation: International Journal of Space Science and Engineering, Vol. 3, No. 3 (2015) pp. 279 - 294
      PubDate: 2015-11-27T23:20:50-05:00
      DOI: 10.1504/IJSPACESE.2015.073214
      Issue No: Vol. 3, No. 3 (2015)
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