Validation of Ranging Signal Control Techniques for Geostationary Satellite Navigation Payloads

Robert Coker, A. J. Van Dierendonck and C. R. Debord

Abstract:	utilize Geostationary Satellites (GEOs) to provide ranging sources in addition to the GPS satellite ranging sources. The GE0 acts as a transponder for a GPS-like signal radiated from and controlled by a Ground Station (GS). The GS monitors the range and coherence of the GEOs ranging signal, providing closed loop control over it. The control of the signal is designed to make the ranging signal appear as if it originated at the GE0 by compensating for uplink ionospheric delay, GE0 transponder frequency offset and uplink Doppler shift. The algorithm used to control the signal generation at the GS has been tested via a pure software model and a mixed hardware/software model of the system. Both include the GS software interacting with the satellite’s motion and transponder. Ionospheric effects were not modeled at this time. The purpose of this paper is to report, in greater length, the test methodology used to validate the algorithm and to present the results of that validation work to date.
Published in:	Proceedings of the 9th International Technical Meeting of the Satellite Division of The Institute of Navigation (ION GPS 1996) September 17 - 20, 1996 Kansas City, MO
Pages:	827 - 833
Cite this article:	Coker, Robert, Van Dierendonck, A. J., Debord, C. R., "Validation of Ranging Signal Control Techniques for Geostationary Satellite Navigation Payloads," Proceedings of the 9th International Technical Meeting of the Satellite Division of The Institute of Navigation (ION GPS 1996), Kansas City, MO, September 1996, pp. 827-833.
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