Space Flight Test Results for the SOAR Experiment

Jaeyong Um and E. Glenn Lightsey

Abstract:	The first on-orbit data from the Space Integrated GPS/INS (SIGI) sensor is analyzed after the SIGI Or- bital Attitude Readiness (SOAR) demonstration dur- ing the STS-101 mission of the Space Shuttle Atlantis in May 2000. The attitude solution with GPS mea- surements only and the extended Kalman filter (EKF) result with integrated GPS/INS measurents are com- pared with the results from star trackers. Additional studies were carried out to improve the performance of the attitude determination. First, a cold start initialization module using signal-to-ratio (SNR) was developed to overcome the limitation in the integer ambiguity resolution of the current on- board algorithm that the pitch and roll angles should be less than 15 ° for successful integer search. Sec- ond, GPS-based attitude determination with line bias modeling was performed to improve the performance of the point solution.
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:	2243 - 2251
Cite this article:	Um, Jaeyong, Lightsey, E. Glenn, "Space Flight Test Results for the SOAR Experiment," 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. 2243-2251.
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