Centimeter Precise Orbit Determination for SWARM Satellite via Reduced-dynamic Method

doi:10.11947/j.AGCS.2016.20160284

Abstract

Abstract: Combining dual-frequency satellite-borne GPS observations with reduced dynamic models, and introducing proper pseudo-stochastic pulse parameters into the satellite's motion equation, SWARM satellite precise orbit determination is implemented. The orbit accuracy is assessed using three methods, which include analysis satellite-borne GPS phase observation residuals, orbit overlaps and external orbit comparisons. The results indicate that the SWARM satellite-borne GPS phase observation residual RMS is in the range of 7 to 10 mm, radial, along-track and cross-track orbit overlap difference RMS of 6 hours are about 1 cm, three directions have no significant systematic errors, comparisons with orbits computed by European Space Agency (ESA), Radial orbit difference RMS is in the range of 2 to 5 cm, along-track orbit difference RMS is in the range of 2 to 5 cm, cross-track orbit difference RMS is in the range of 2 to 4 cm, 3D orbit difference RMS is in the range of 4 to 7 cm, SWARM-B orbit accuracy is better than SWARM-A and SWARM-C. This evaluations indicate that SWARM satellite precise orbit determination is practicable by using reduced-dynamic method and orbit determining strategy in the article, the orbit solution is well and stable, the orbit accuracy reaches centimeter level.

Key words: SWARM satellite, pseudo-stochastic pulses, reduced-dynamic method, orbit determining strategy, centimeter level

CLC Number:

P228

ZHANG Bingbing, NIE Linjuan, WU Tangting, FENG Jiandi, QIU Yaodong. Centimeter Precise Orbit Determination for SWARM Satellite via Reduced-dynamic Method[J]. Acta Geodaetica et Cartographica Sinica, 2016, 45(11): 1278-1284.

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