The application of LEOS to Cycle Ambiguity Resolution on Navstar Transmissions for Kinematic Carrier-Phase Positioning

Matthew Rabinowitz, Bradford W. Parkinson, Clark E. Cohen

Abstract:	Described herein is a system for resolving p-sition within a few minutes to centimeter-level accuracy relative to a reference receiver. Our concept is moti-vated by the promise of large fleets qf Low Earth Orkdt Satellites (LEOS) in the near future. The method in-volves a user and a reference receiver simultaneously tracking transmissions from LEOS together with trans-missions from the Navstar Constellation. The rapid change in geometry, due to the motion of the LEOS relative to the user and reference receivers, enables the quick and accurate resolution of integer cycle am-biguities on the Navstar Satellite pignals. In order to achieve centimeter-level kinematic positioning pre-cision without the use of specialized electronics such as atomic clocks, the approach accounts for instaM]li-ties in the crystal oscillators driving the satellite trans-mitters, as well as the reference and User receivers. In addition, the algorithm accommodates frequency-dependent phase lags which differ in the user and ref-erence receivers. We consider in d@ail our approach applied to the Globalstar Telecommunications SateUite Fleet. By Monte-Carlo simulation, we gauge the perfor-mance of the technique for centimeter-level positioning.
Published in:	Proceedings of the 10th International Technical Meeting of the Satellite Division of The Institute of Navigation (ION GPS 1997) September 16 - 19, 1997 Kansas City, MO
Pages:	867 - 881
Cite this article:	Rabinowitz, Matthew, Parkinson, Bradford W., Cohen, Clark E., "The application of LEOS to Cycle Ambiguity Resolution on Navstar Transmissions for Kinematic Carrier-Phase Positioning," Proceedings of the 10th International Technical Meeting of the Satellite Division of The Institute of Navigation (ION GPS 1997), Kansas City, MO, September 1997, pp. 867-881.
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