融合BDS/GPS/GLONASS解算卫星差分码偏差及精度分析

Analysis of Satellite Differential Code Biases and Accuracy by Fusion of BDS/GPS/GLONASS

卫星差分码偏差是影响用户导航定位和授时定位精度的重要因素。本文融合BDS/GPS/GLONASS三系统数据,采用中国测绘科学研究院i GMAS分析中心自主研发的软件解算卫星差分码偏差。结果表明:GPS卫星P1P2差分码偏差与CODE产品非常吻合,精度非常高,且非常稳定; BDS卫星B1B3差分码偏差与CODE产品基本吻合,且基本稳定; GLONASS卫星P1P2差分码偏差与CODE产品相对吻合,精度较高,且比较稳定。对比三系统,GPS系统P1P2差分码偏差精度最高,且最稳定; GLONASS系统P1P2差分码偏差精度和稳定性比GPS略低; BDS系统B1B3差分码偏差精度和稳定性最低,可能是星座不完善的原因。

Satellite differential code deviation is an important factor affecting the navigation and positioning accuracy of users. This paper combines the data of BDS/GPS/GLONASS three system and uses the software of i GMAS analysis center of China Academy of Surveying and Mapping to solve the satellite differential code deviation. Results show that GPS P1 P2 satellite differential code bias and CODE products is very consistent,the accuracy is very high,and very stable. BDS B1 B3 satellite differential code bias and CODE products are basically consistent and stable. GLONASS P1 P2 satellite differential code bias and CODE products are relatively consistent,high precision and stable. Comparison of three systems,GPS system P1 P2 differential code bias has the highest accuracy,and is the most stable. GLONASS system P1 P2 differential code bias stability and accuracy is slightly lower than the GPS. BDS system B1 B3 differential code bias precision and stability is the lowest,which may be a cause of incomplete constellation.