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  • Other Sources  (2)
  • Astrodynamics  (1)
  • Space Radiation  (1)
  • 2020-2024
  • 2005-2009
  • 2000-2004  (2)
  • 1955-1959
  • 1935-1939
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  • Other Sources  (2)
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  • 2020-2024
  • 2005-2009
  • 2000-2004  (2)
  • 1955-1959
  • 1935-1939
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  • 1
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    Algorithms for Autonomous GS Orbit Determination and Formation Flying (2001)
    In:  Other Sources
    Details
    Publication Date: 2019-07-17
    Description: This final report for our study of autonomous Global Positioning System (GPS) satellite orbit determination comprises two sections. The first is the Ph.D. dissertation written by Michael C. Moreau entitled, "GPS Receiver Architecture for Autonomous Navigation in High Earth Orbits." Dr. Moreau's work was conducted under both this project and a NASA GSRP. His dissertation describes the key design features of a receiver specifically designed for autonomous operation in high earth orbits (HEO). He focused on the implementation and testing of these features for the GSFC PiVoT receiver. The second part is a memo describing a robust method for autonomous initialization of the orbit estimate given very little a priori information and sparse measurements. This is a key piece missing in the design of receivers for HEO.
    Keywords: Astrodynamics
    Type: PA-01-189
    Format: text
    Location Call Number Expected Availability
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    NASA TECHNICAL REPORTS
  • 2
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    Conductance Effects on Inner Magnetospheric Plasma Morphology: Model Comparisons with IMAGE EUV, MENA, and HENA Data (2004)
    In:  Other Sources
    Details
    Publication Date: 2019-07-18
    Description: Modeling results of the inner magnetosphere showing the influence of the ionospheric conductance on the inner magnetospheric electric fields during the April 17, 2002 magnetic storm are presented. Kinetic plasma transport code results are analyzed in combination with observations of the inner magnetospheric plasma populations, in particular those from the IMAGE satellite. Qualitative and quantitative comparisons are made with the observations from EW, MENA, and HENA, covering the entire energy range simulated by the model (0 to 300 keV). The electric field description, and in particular the ionospheric conductance, is the only variable between the simulations. Results from the data-model comparisons are discussed, detailing the strengths and weaknesses of each conductance choice for each energy channel.
    Keywords: Space Radiation
    Type: Spring AGU 2004 Meeting: 2004 Joint Assembly AGU, CGU, and Society of Exploration Geophysicists; May 17, 2004 - May 21, 2004; Montreal; Canada
    Format: text
    Location Call Number Expected Availability
    BibTip Others were also interested in ...
    NASA TECHNICAL REPORTS
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