Results From Real GPS Data From a Trimble TANS II Receiver in a Low Altitude Orbit

Isabel Osorio, Jose Pereira Osorio, Jose Manuel Rebordao

Abstract:	GPS has been considered an important promising tool as a basis for accurate autonomous navigation systems fm LEO satellites. A single fiequeney six channels Trimble TANS H GPS receiver is on board of the Portuguese mierosatellite PoSAT- 1, launched late in 1993. Although it is only a single experiment, among others that include the main objectives of the mission, bhxks of GPS raw data could be received on the ground fcr the purpose of this study. Trimble TANS II observable are codephases and Doppler measurements; the first ones represent only the fiaetion of milliseconds of time propagation of GPS signal, that is to say, those values are ambiguous to the entire portion of the milliseconds. An algorithm for orbit determination, based on a Kalman filter, was developed. In this filter, pseudorrmges and Doppler raw data were used as measurements. The main purpose of the paper is to discuss the autonomous navigation system developed using the smoothed pseudoranges as observable; some emphasis will also be given to the structure detected for the codephase measurements, the problems arising when converting the observed codephases into pseudoranges and the process used to smooth pseudoranges with the Doppler data.
Published in:	Proceedings of the 54th Annual Meeting of The Institute of Navigation (1998) June 1 - 3, 1998 The Adams Mark Hotel Denver, CO
Pages:	167 - 171
Cite this article:	Osorio, Isabel, Osorio, Jose Pereira, Rebordao, Jose Manuel, "Results From Real GPS Data From a Trimble TANS II Receiver in a Low Altitude Orbit," Proceedings of the 54th Annual Meeting of The Institute of Navigation (1998), Denver, CO, June 1998, pp. 167-171.
Full Paper:	ION Members/Non-Members: 1 Download Credit Sign In