Post-maneuver orbit determination based on the predicted clocks

doi:10.11947/j.AGCS.2020.20190078

Abstract

Abstract: The BDS system is designed as a GEO/IGSO/MEO mixed constellation. Satellite maintaining operation is performed every 7 to 10 days for GEO/IGSO satellites. With the maneuver satellite's status being unhealthy in the post-maneuver period, which lasts 5~6 hours, the BDS system usability is affected. In the long unhealthy periods, observation data together with satellite/station clocks are accumulated until the processed orbits meet precision requirement. To shorten the satellite's unhealthy time during post-maneuver, we propose an orbit determination method making use of the predicted satellite/station clocks. With the clocks being modeled with high precision, data of longer observation arc could be used, thus improve the orbit accuracy. In the modeling of satellite and station clocks, the reference inconsistency between the two-way satellite time frequency transfer(TWSTFT) and dynamic precise orbit determination(POD) techniques are considered. Three satellite maneuver events in November 2018 are analyzed. Results show that the satellite unavailability time could be shortened by at least 1 hour. And it improves the accuracy of orbit prediction with maximum of 84.82% for the first group of orbits in post-maneuver. For the POD from 3h to 8h after maneuver, the mean improvement of orbit prediction accuracy is of 26.06%(C01),31.58%(C04) and 9.95%(C03) by using the proposed method.

Key words: BDS, two-way satellite time frequency transfer, satellite clock error, station clock error, precise orbit determination, rapid orbit recovery, satellite availability

CLC Number:

P228

CHEN Qian, CHEN Junping, WU Shan, ZHANG Yize, YU Chao. Post-maneuver orbit determination based on the predicted clocks[J]. Acta Geodaetica et Cartographica Sinica, 2020, 49(1): 24-33.

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