Characterization of pesudorange bias and its effect on positioning for BDS satellites

doi:10.11947/j.AGCS.2020.20200329

Abstract

Abstract: Distortions of GNSS signals result in pesudorange biases. The biases are different for different receivers depending on frontend bandwidth and employed filters of receivers. Pesudorange biases are treated as a new error sources in this paper. Firstly, two pesudorange bias calibration calculation methods namely collocated receivers-based method and differential code bias (DCB) based method are proposed to separate pesudorange biases and other error sources. Then pesudorange biases are calculated, estimated and separated from other error sources using collocated receivers-based method. The STD of BDS estimated pesudorange biases series is approximately 0.1 m. The BDS estimated pesudorange biases keep constant with time. Pesudorange biases are also irrelevant with geographical locations of receivers. At 1.5 G band, B1I pesudorange bias is the largest. The pesudorange biases of BDS new signal B1C improve a lot compared with pesudorange biases of BDS B1I and are also much better than the GPS L1C/A. At other bands, pesudorange biases of GPS L2C are slightly larger than BDS B3I, followed by GPS L5C, pesudorange biases of BDS B2a are the smallest. The influence of pesudorange biases is also analyzed with measurements. Pesudorange biases are highly-correlated with total group delay (TGD). If the user receivers are quite different with those used for TGD calculation, the positioning accuracy will get worse.

Key words: pesudorange biases, BDS, positioning, total group delay

CLC Number:

P228.4

TANG Chengpan, SU Chengeng, HU Xiaogong, GAO Weiguang, LIU Li, LU Jun, CHEN Ying, LIU Cheng, WANG Wei, ZHOU Shanshi. Characterization of pesudorange bias and its effect on positioning for BDS satellites[J]. Acta Geodaetica et Cartographica Sinica, 2020, 49(9): 1131-1138.

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