The Beidou navigation satellite system is a very important sensor for positioning in the Asia-Pacific region. The Beidou inclined geosynchronous orbit (IGSO) and medium Earth orbit (MEO) satellites have been analysed in some studies previously conducted by other researchers; this paper seeks to gain more insight regarding the geostationary earth orbit (GEO) satellites. Employing correlation analysis, Fourier transformation and wavelet decomposition, we validate whether there is a systematic bias in their multipath combinations. These biases can be observed clearly in satellites C01, C02 and C04 and have a great correlation with time series instead of elevation, being significantly different from those of the Beidou IGSO and MEO satellites. We propose a correction model to mitigate this bias based on its daily periodicity characteristic. After the model has been applied, the performance of the positioning estimations of the eight stations distributed in the Asia-Pacific region is evaluated and compared. The results show that residuals of multipath series behaves random noise; for the single point positioning (SPP) and precise point positioning (PPP) approaches, the positioning accuracy in the upward direction can be improved by 8 cm and 6 mm, respectively, and by 2 cm and 4 mm, respectively, for the horizontal component.
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机译：北斗导航卫星系统是在亚太地区定位的非常重要的传感器。其他研究人员先前进行的一些研究已经对北斗倾斜地球同步轨道（IGSO）和中地球轨道（MEO）卫星进行了分析。本文旨在获取有关地球静止地球轨道（GEO）卫星的更多见解。使用相关分析，傅立叶变换和小波分解，我们验证了它们的多径组合中是否存在系统偏差。这些偏差可以在C01，C02和C04卫星中清楚地观察到，并且与时间序列而不是海拔高度有很大的相关性，与北斗IGSO和MEO卫星的偏差明显不同。我们提出了一种校正模型，以根据其每日周期性特征来减轻这种偏差。应用该模型后，将评估和比较分布在亚太地区的八个台站的定位估计性能。结果表明，多径序列的残差表现为随机噪声。对于单点定位（SPP）和精确点定位（PPP）方法，向上方向的定位精度可以分别提高8 cm和6 mm，对于水平分量可以分别提高2 cm和4 mm 。
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