Multipath Error Analysis of COMPASS Triple Frequency Observations

Xuying Ma, Yunzhong Shen

College of Surveying and Geo-Informatics, Tongji University, Shanghai, China.
College of Surveying and Geo-Informatics, Tongji University, Shanghai, China; Center for Spatial Information Science and Sustainable Development, Tongji University, Shanghai, China..

DOI: 10.4236/pos.2014.51002                

Abstract

The BeiDou-2 satellite navigation system broadcasts triple frequency data. In this paper, the pseudorange multipath is extracted by using the geometry-free and ionosphere-free combination of one pseudorange and two phase measurements, and the phase multipath is extracted by using triple frequency phase measurements, respectively. By using several days’ static observation data, we exact the noisy pseudorange and phase multipath of three types of satellites, GEO, IGSO and MEO satellites. Because of the low frequency characteristics of the multipath, the low frequency wavelet filter is further used to recover the high-precision low frequency multipath signals that are specified by their amplitudes, periods and phases. The results show that the multipath periods are about 86160s, 86158s and 46391s for GEO, IGSO and MEO satellites, respectively, which coincide with that of the corresponding satellite orbits. Then we use the extracted multipath signals to correct the pseudorange measurements in order to improve the accuracy of point positioning. The positioning accuracy in East-West direction can be significantly improved by using the multipath corrected pseudorange measurements, and in the other two directions the positioning accuracy can also be improved to some extent.

Keywords

BeiDou-2 (COMPASS); Multipath; Wavelet Filtering; Single Point Positioning

Conflicts of Interest

The authors declare no conflicts of interest.

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