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  • 1
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    Doubly-Differenced Measurements for Orbit Determinations (1985)
    In:  Other Sources
    Details
    Publication Date: 2019-06-28
    Description: Report describes accurate method of determining orbit of low-altitude Earth satellite. Method insensitive to clock errors and provides continuous determination of orbit. Report examines effects of employing fewer ground stations, applying different solution strategies, and introducing fictitious thrust parameters to minimize geopotential modeling error - one of major error sources.
    Keywords: ELECTRONIC SYSTEMS
    Type: NPO-16111 , NASA Tech Briefs (ISSN 0145-319X); 9; 1; P. 71
    Format: text
    Location Call Number Expected Availability
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    NASA TECHNICAL REPORTS
  • 2
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    Estimating Effects of Flicker Noise in Clock Signals (1984)
    In:  Other Sources
    Details
    Publication Date: 2019-06-28
    Description: Two techniques mathematically estimate effects of flicker noise in pulse trains used as clock signals.
    Keywords: ELECTRONIC SYSTEMS
    Type: NPO-15525 , NASA Tech Briefs (ISSN 0145-319X); 8; 2; P. 188
    Format: text
    Location Call Number Expected Availability
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    NASA TECHNICAL REPORTS
  • 3
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    Global Timing With Low- and High-Orbiting Satellites (1986)
    In:  Other Sources
    Details
    Publication Date: 2019-07-12
    Description: Report summarizes method for synchronizing clocks at intercontinental distances employing satellites of Global Positioning System (GPS) in high Earth orbit and transit satellite in orbit at relatively low altitude of about 1,300 km. When fully implemented, method expected to supply precise time measurements for world-wide communication and navigation.
    Keywords: ELECTRONIC SYSTEMS
    Type: NPO-16407 , NASA Tech Briefs (ISSN 0145-319X); 10; 5; P. 57
    Format: text
    Location Call Number Expected Availability
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    NASA TECHNICAL REPORTS
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