The Positioning Performance Analysis of BeiDou/Pseudolites Collaboration by CNMC Method

doi:10.11947/j.AGCS.2016.F041

Abstract

Abstract:

At present, the number of orbit satellites is limited for the Beidou satellite navigation system. In special terrain like “city Canyon” and other special circumstances, the signal of Beidou is easy to be blocked, which reduces positioning accuracy or interrupts positioning continuity of users. Joining pseudolites can effectively solve the problem of the insufficient number of BeiDou satellites visible to users. During cooperative positioning of Beidou satellites and pseudolites, the multi-path problem in pseudo-range observation values of the BeiDou satellite and the pseudolite shall be properly handled to obtain better positioning accuracy. The CNMC method (Code Noise and Multi-path Correction) can effectively reduce the multi-path effect of the BeiDou satellite's pseudo-range observation value, but cannot be applied directly to pseudo-range data processing of the pseudolite due to different observation error characteristics caused by different signal propagation paths. To solve the multi-path processing problem of pseudolites, the CNMC method is improved in this paper. The BeiDou/Pseudolite dynamic cooperative positioning experiments were conducted in the actual field of pseudolites. The test results show that the three-dimensional positioning accuracy is increased from 2.326 m to 1.936 m with enhanced positioning stability after pseudo-range observation values of the BeiDou satellite and the ground pseudolite are processed by the CNMC method.

Key words: BeiDou system, pseudolites, multi-path, CNMC, positioning performance

CLC Number:

P227

FU Jingyang, ZHOU Jianhua, LI Guangyun. The Positioning Performance Analysis of BeiDou/Pseudolites Collaboration by CNMC Method[J]. Acta Geodaetica et Cartographica Sinica, 2016, 45(S2): 188-193.

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