Chapter 6 Study of Determination Orbit of COMPASS-GEO After Maneuvers with Short Segmental Arc

摘要

The GEO satellite must be maneuvered periodically for station-keeping due to its particular orbit. How to realize rapid orbit determination and prediction after orbit maneuver of GEO and shorten the orbit recovery time must be studied for COMPASS navigation system. With high sampling rate measurement from C transponder by TWSTFT, the precision of COMPASS-GEO orbit determination and prediction in non-maneuver period is analyzed. Then, the strategy of orbit determination with short segmental arc is discussed in detail. Base on transcendental information including dynamic model and observation model of former maneuver arc, only six orbit elements are computed for improving the precision of prediction. It is tested that the transponder time delay and bias of station are the key factor in short arc determination. With 15 min tracking arc, the 2 h prediction accuracy is better than 15 m, and the radial accuracy is better than 2.5 m. With 1 h tracking arc, the 4 h prediction accuracy is better than 20 m, and the radial accuracy is better than 2.0 m.