Assessment of BDS Ambiguity Resolution with GEO/IGSO/MEO Satellites

doi:10.11947/j.AGCS.2018.20170341

Abstract

Abstract: Since the precision of GEO satellite orbit is low and the observations of GEO are affected seriously by the multipath and code bias, now no analysis center in the world provide the uncalibrated phase delay (UPD) products of BeiDou Satellite Navigation System (BDS) GEO satellites. At present, the BDS precise point positioning (PPP) ambiguity resolution (AR) for global users still limits on the IGSO and MEO satellites. In our study, we eliminated the code bias of IGSOMEO satellite by using the elevation-dependent model proposed by the Wanninger and Beer and the code bias of GEO satellite was corrected by the wavelet transform. We also improve the method of NL UPD estimation by applying accurate UPDs estimated in last epoch to select the correct ambiguities at current epoch. Once we obtain the high-quality UPD products, the BDS PPP ambiguity resolution with GEOIGSOMEO satellites is achieved and then the performance of the PPP AR results is evaluated. Results show that:The convergence time and the time to first fix are both less than 30 min for BDS PPP ambiguity resolution with GEOIGSOMEO satellites. The positioning error based on six-hour observations for East, North and UP direction are reduced by 20%, 27% and 18% (from 1.35, 0.35 and 2.75 cm to 1.07, 0.26, and 2.24 cm).

Key words: BeiDou satellite navigation system, precise point positioning, ambiguity resolution, uncalibrated phase delay, BeiDou satellite-induced code bias

CLC Number:

P228

LI Xin, YUAN Yongqiang, ZHANG Keke, ZENG Qi, ZHANG Xiaohong, LI Xingxing. Assessment of BDS Ambiguity Resolution with GEO/IGSO/MEO Satellites[J]. Acta Geodaetica et Cartographica Sinica, 2018, 47(3): 324-331.

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