Examination of the GPS Block IIR Solar Pressure Model

Willard Marquis and Chris Krier

Abstract:	The GPS Block IIR satellites built by Lockheed Martin are an advanced design over earlier versions. On-Orbit experience shows the Rubidium clocks to be the best in the constellation. And on-orbit reprogramming of the flight computers has allowed several operational mission enhancements to be loaded to the vehicles. Also new for the Block IIR is a significantly enhanced solar pressure model developed by Lockheed Martin Space Systems based on years of experience with various Lockheed Martin satellites and implemented by Lockheed Martin Mission Systems. This improved solar pressure model provides for more accurate state solutions by the MCS Kalman Filter. In this paper, the analytical model is compared with the on-orbit experience of the first two Block IIR satellites. Both early-life initialization and on-orbit life are examined for behavior of the model. Comparison is made with the ROCK42 model of the Block II and IIA satellites. Overall, the Block IIR Solar Pressure Model is shown to perform quite well, adding improved accuracy to an already accurate system. This will benefit the user as more IIR satellites are added to the constellation.
Published in:	Proceedings of the 13th International Technical Meeting of the Satellite Division of The Institute of Navigation (ION GPS 2000) September 19 - 22, 2000 Salt Palace Convention Center Salt Lake City, UT
Pages:	407 - 415
Cite this article:	Marquis, Willard, Krier, Chris, "Examination of the GPS Block IIR Solar Pressure Model," Proceedings of the 13th International Technical Meeting of the Satellite Division of The Institute of Navigation (ION GPS 2000), Salt Lake City, UT, September 2000, pp. 407-415.
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