Validation of SGP4 and IS-GPS-200D Against GPS Precision Ephemerides

AAS 07-127

Kelso, T.S., "Validation of SGP4 and IS-GPS-200D Against GPS Precision Ephemerides," presented at the 17th AAS/AIAA Space Flight Mechanics Conference, Sedona, AZ, 2007 January 29.

Abstract

Many applications use the NORAD SGP4 orbital model for predicting satellite ephemerides and often these applications require knowledge of the errors associated with those predictions. Unfortunately, the SGP4 orbital data, in the form of two-line element (TLE) sets, does not provide any kind of accuracy information. Some approaches have been published which purport to estimate these errors by performing consistency or abutment checks, but they do not validate their assumptions or provide any validation by comparison to high-accuracy ephemerides. This paper will assess the suitability of these approaches by comparing SGP4 ephemerides to precision ephemerides available for the GPS constellation.

Conference Materials

• Paper (Adobe Acrobat, 727,897 bytes)
• Presentation (PowerPoint, 1,943,040 bytes)
• Additional Images: Almanac Comparisons to Precise Ephemerides

PRN01 Almanac Comparison	PRN01 Almanac Comparison Statistics
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• Additional Images: TLE Comparisons to Precise Ephemerides and TLE Consistency Plots

PRN01 TLE Comparison	PRN01 TLE Comparison Statistics	PRN01 TLE Consistency	PRN01 TLE Consistency Statistics
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PRN23 TLE Comparison	PRN23 TLE Comparison Statistics	PRN23 TLE Consistency	PRN23 TLE Consistency Statistics
PRN24 TLE Comparison	PRN24 TLE Comparison Statistics	PRN24 TLE Consistency	PRN24 TLE Consistency Statistics
PRN26 TLE Comparison	PRN26 TLE Comparison Statistics	PRN26 TLE Consistency	PRN26 TLE Consistency Statistics
PRN27 TLE Comparison	PRN27 TLE Comparison Statistics	PRN27 TLE Consistency	PRN27 TLE Consistency Statistics
PRN28 TLE Comparison	PRN28 TLE Comparison Statistics	PRN28 TLE Consistency	PRN28 TLE Consistency Statistics

	TLE Data	Space Data
	Current Archives Documentation	GPS EOP Space Weather
	SATCAT	Columns
	Boxscore	Software
	SOCRATES

Dr. T.S. Kelso [TS.Kelso@celestrak.com] Follow CelesTrak on Twitter @TSKelso Last updated: 2007 January 23 17:53:55 UTC Accessed 6,143 times since 2000 December 16 Current system time: 2010 September 2 14:52:43 UTC