NDLI: Gnss ephemeris with graceful degradation and measurement fusion

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Gnss ephemeris with graceful degradation and measurement fusion

Content Provider	NASA Technical Reports Server (NTRS)
Copyright Year	2015
Description	A method for providing an extended propagation ephemeris model for a satellite in Earth orbit, the method includes obtaining a satellite's orbital position over a first period of time, applying a least square estimation filter to determine coefficients defining osculating Keplarian orbital elements and harmonic perturbation parameters associated with a coordinate system defining an extended propagation ephemeris model that can be used to estimate the satellite's position during the first period, wherein the osculating Keplarian orbital elements include semi-major axis of the satellite (a), eccentricity of the satellite (e), inclination of the satellite (i), right ascension of ascending node of the satellite (.OMEGA.), true anomaly (.theta.*), and argument of periapsis (.omega.), applying the least square estimation filter to determine a dominant frequency of the true anomaly, and applying a Fourier transform to determine dominant frequencies of the harmonic perturbation parameters.
File Size	2339082
Page Count	33
File Format	PDF
Alternate Webpage(s)	http://archive.org/details/NASA_NTRS_Archive_20150014986
Archival Resource Key	ark:/13960/t3c01673g
Language	English
Publisher Date	2015-07-07
Access Restriction	Open
Subject Keyword	Astronomy Patents Satellite Orbits Eccentricity Least Squares Method Coordinates Ephemerides Frequencies Perturbation Orbital Elements Coefficients Earth Orbits Ntrs Nasa Technical Reports Server (ntrs) Nasa Technical Reports Server Aerodynamics Aircraft Aerospace Engineering Aerospace Aeronautic Space Science
Content Type	Text
Resource Type	Patent

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