Journal Cover International Journal of Space Science and Engineering
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   Hybrid Journal Hybrid journal (It can contain Open Access articles)
   ISSN (Print) 2048-8459 - ISSN (Online) 2048-8467
   Published by Inderscience Publishers Homepage  [427 journals]
  • Visualisation of K-index-based geomagnetic storm scenario over different
           locations in the USA
    • Authors: Wei Sun, Zhipeng Xu
      Pages: 271 - 308
      Abstract: Geomagnetic storms may introduce unbelievable damaging effects on power grid transmission, satellite communication, RF communication and on various other important electrical and electromagnetic systems. Not only that, these storms may impart serious health hazards to the inhabitants of the biosphere too. Realising these facts, the K-index data obtained from the US Department of Commerce, NOAA, Space Weather Prediction Center, for the time period started from 1994 to 2014 (21 years), are analysed statistically to visualise month-to-month and year-to-year variation in the percentage occurrences of ten different geomagnetic conditions (classification based on ten different values of K-index) over Fredericksburg (38.2047°N, 77.3729°W), College (64.8742°N, 147.8597°W) and Estimated Planetary in the USA. The obtained result focuses the variation in degree of sensitivity of these locations for the occurrence of different kinds of geomagnetic storms. Various useful information emerged out from this article find application in civil aviation, navigation, communication, power grid transmission and related fields.
      Keywords: geomagnetic storm; inactive; very quiet; quiet; unsettled; active; minor storm; major storm; severe storm; very severe storm; extremely severe storm; percentage occurrence; K-index
      Citation: International Journal of Space Science and Engineering, Vol. 4, No. 4 (2017) pp. 271 - 308
      PubDate: 2017-10-06T23:20:50-05:00
      DOI: 10.1504/IJSPACESE.2017.087169
      Issue No: Vol. 4, No. 4 (2017)
  • Feature-based visual servo control preserving wide-angle properties of
           super wide-angle lens
    • Authors: Hirohisa Kojima, Pavel M. Trivailo
      Pages: 309 - 329
      Abstract: Feature-based visual servo control methods determine camera motion by comparing a current feature image and the goal feature image. Because these methods do not require 3D information for the object, no geometric model of the object is needed, and it is therefore robust against various disturbances. Several feature-based visual servo control methods have been proposed, such as using a wide-angle lens allows the camera to capture the object in a wide angular range. However, when using a wide-angle lens with a conventional control scheme the camera undergoes wasted motion due to the peripheral distortion of wide-angle lenses. In addition, correction of the image distortion results in the loss of the wide-angle properties of the lens. This paper proposes a new feature-based visual servo control method based on a super wide-angle lens that preserves wide-angle properties.
      Keywords: visual servo; wide-angle lens; lens distortion; space robotic manipulator control
      Citation: International Journal of Space Science and Engineering, Vol. 4, No. 4 (2017) pp. 309 - 329
      PubDate: 2017-10-06T23:20:50-05:00
      DOI: 10.1504/IJSPACESE.2017.087171
      Issue No: Vol. 4, No. 4 (2017)
  • High-speed observation of bare electrodynamic tape tether in
           inverse-origami method
    • Authors: Hirohisa Kojima, Pavel M. Trivailo
      Pages: 330 - 350
      Abstract: Electrodynamic tethers that make use of electricity-conducting tethers in space could provide a propellant-free propulsion system in low Earth orbit. In 2010, deployment of a bare electrodynamic tape tether was attempted in a S-520-25 sounding rocket experiment by an international team of Japan, Europe, the USA and Australia. A new scheme, the inverse-origami method, is employed for the tape tether deployment and the space deployment of tape tether was the first success in the world. Understanding of deployment dynamics of tape tethers is prerequisite to establishing a highly reliable deployment technique of tape tethers in space. This paper introduces results of tether deployment experiments on the ground after the space demonstration. A high-speed camera is used to capture the dynamic behaviour of the tape tether under the deployment regime. The analysis of the experimental results shows the deployment drag induced by the friction force between the tape tether and the exit of the storage box as well as the deformation of the tape tether.
      Keywords: bare electrodynamic tape tether; sounding rocket; space deployment; inverse-origami method; deployment dynamics; friction; highly reliable deployment; high-speed camera
      Citation: International Journal of Space Science and Engineering, Vol. 4, No. 4 (2017) pp. 330 - 350
      PubDate: 2017-10-06T23:20:50-05:00
      DOI: 10.1504/IJSPACESE.2017.087182
      Issue No: Vol. 4, No. 4 (2017)
School of Mathematical and Computer Sciences
Heriot-Watt University
Edinburgh, EH14 4AS, UK
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