Orbit determination of geosynchronous satellites by VLBI and differential VLBI

Astronomy and Astrophysics – Astronomy

Scientific paper

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Differential Interferometry, Geosynchronous Orbits, Orbital Position Estimation, Radio Tracking, Satellite Tracking, Very Long Base Interferometry, Global Positioning System, Navstar Satellites, Position Errors, Quasars, Radio Interferometers, Reference Stars

Scientific paper

Four approaches to radio interferometric tracking of geosynchronous satellites are analyzed and compared. Quasar-based differential very-long-baseline interferometry, which requires a very sensitive receiver, can achieve meter-level position accuracy with a two-baseline system. Satellite-based differential VLBI gives somewhat lower accuracy with a compact, inexpensive receiver. Nondifferential VLBI, using less precise media and clock calibrations obtained by observing the GPS satellites, still gives 5-10 m position accuracy with two baselines. For a sufficiently inclined orbit, all interferometric approaches can yield six-component satellite state from a single baseline.

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