FY3C Satellite Onboard BDS and GPS Data Quality Evaluation and Precise Orbit Determination

doi:10.11947/j.AGCS.2018.20180282

Abstract

Abstract: To analyze the precise orbit determination (POD) performance with combined onboard GPS and BDS data, we collect one-month worthy of BDS and GPS dual-frequency data from FY3C satellite during May 2015. The onboard BDS and GPS data quantity and quality are evaluated. It is revealed that there are over 98% epochs with 4 or more GPS satellites available, but only 35% epoch can observed 4 or more BDS satellites. Similar with the ground BDS data, the code-carrier divergences are also found in the onboard FY3C BDS data with fluctuations exceeding 1 m. However, these multipath error variations are observed not only related to elevations and frequencies but also to azimuths. The POD precision with only GPS data is evaluated by overlap comparison, showing good orbit consistency at 20 mm level (3D RMS). We perform the combined POD with three different strategies. It is shown that it can dramatically degrade the POD precision when BDS GEO (geosynchronous orbit satellites) observations are involved and treated with equal weighting, and the orbit precision is about 90 mm level compared to the GPS-only orbits. This should be attributed to the degraded BDS GEO satellite orbit and clock products. However, when performing combined POD with only BDS IGSO and MEO satellites along with GPS or by reducing the weights of GEO observations, the post-fit RMS of BDS LC residuals are comparable to that of GPS, and the orbit differences between combined POD and GPS-only POD are only at 10 mm level. This indicates that the precisions of combined POD using these two strategies are very consistent with respect to POD with GPS data alone.

Key words: low earth orbit satellite, precise orbit determination, BDS, GPS, orbit precision

CLC Number:

P228

LI Wenwen, LI Min, ZHAO Qile, SHI Chuang, GUO Xiang, MENG Xiangguang, YANG Zhongdong. FY3C Satellite Onboard BDS and GPS Data Quality Evaluation and Precise Orbit Determination[J]. Acta Geodaetica et Cartographica Sinica, 2018, 47(S0): 9-17.

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