Satellite Orbit Determination Using TWSTFT Signals

T. Feldmann, A. Balu, S. Liu, W. Schäfer

Abstract: Satellite orbit determination is very often done by using similar equipment as that operated for Two-Way Satellite Time and Frequency Transfer (TWSTFT) between metrology laboratories contributing to TAI and UTC. It relies on measuring roundtrip delay times between ground stations and satellite from several sites. This is only possible if up- and downlink transponders coincide. This is not the case for many satellites, e.g. if intercontinental distances are bridged or if several downlink beamspots restricted to dedicated geographical regions are used. We present an analytical approach for satellite position determination using the one-way signal between one master uplink site and at least 3 geographically distributed receiving stations. Corrections of physical influences on the signal path, like e.g. Earth atmosphere and Sagnac delay, are applied from external sources and models. The delay corrections and the handling of station dependent delays can be improved by an iterative process.
Published in: Proceedings of the 45th Annual Precise Time and Time Interval Systems and Applications Meeting
December 2 - 5, 2013
Hyatt Regency Bellevue
Bellevue, Washington
Pages: 178 - 186
Cite this article: Feldmann, T., Balu, A., Liu, S., Schäfer, W., "Satellite Orbit Determination Using TWSTFT Signals," Proceedings of the 45th Annual Precise Time and Time Interval Systems and Applications Meeting, Bellevue, Washington, December 2013, pp. 178-186.
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