Characteristic analysis and correction of BeiDou satellite-induced code bias

doi:10.13474/j.cnki.11-2246.2019.0069

Abstract

Abstract: There are systematic errors on BeiDou code pseudorange measurements because of the influence of satellite-induced errors which are called satellite-induced biases.The IGSO and MEO satellites can establish the correction model by the relationship between code bias and elevation,but the GEO satellite is difficult to establish the correction model because of the small change of elevation.In this contribution,with the analysis of characteristics of GEO satellite-inducedcode bias,a method of correcting is proposed based on singular spectrum ananlysis (SSA),and the correction effect is verified by the experiment of single point positioning (SPP) of ionosphere-free combination.The results show that after correction,the accuracy of GEO MP observation improves 39.9%,17.9% and 29.4% respectively in N,E and U,and the MW observation improves 41.3%.Correcting IGSO and MEO code bias with the traditional correction model has little influence on SPP,while correcting GEO and IGSO pseudo range errors with the singular spectrum analysis method improves the accuracy of SPP by 11.1% and 21.1% respectively in the plane and elevation direction.

Key words: BeiDou system, code pseudorange bias, singular spectrum ananlysis, MP combination, MW combination, dual-frequency single point positioning

CLC Number:

P228

ZHU Shaolin, YUE Dongjie, CHEN Jian, TANG Tongxu, ZHANG Yuan. Characteristic analysis and correction of BeiDou satellite-induced code bias[J]. 测绘通报, 2019, 0(3): 11-15,26.

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