北斗三号卫星新信号数据质量分析

Data Quality Analysis of New Signal of BDS-3 Satellite

目前,北斗第三代导航系统(BDS-3)建设已经完成,BDS-3在原来BDS-2系统已有的B1、B2、B3信号的基础上新增加了B1C、B2a以及B2b信号。为验证BDS-3系统新增加信号的性能,选取了11个IGS测站2022年年积日1~7d的观测数据,从数据完整率、周跳比、信噪比和伪距多路径进行分析。结果表明,B2a信号在数据完整率、信噪比以及伪距多路径值方面明显好于B1C信号;B2b信号的数据完整率以及多路径误差介于B1C与B2a之间;B2b信号强度最高;BDS-3系统的数据完整率以及信噪比与全球定位系统(GPS)、伽利略卫星导航系统(Galileo)处在同一水平;在伪距多路径方面BDS-3系统不如GPS和Galileo;在周跳比方面,所使用的11个观测站,周跳比均能达到规范要求。

At present,the construction of the third-generation BeiDou navigation system(BDS-3)has been completed.BDS-3 adds B1C,B2a and B2b signals to the existing B1,B2 and B3 signals of the original BDS-2 system.In order to verify the performance of the newly added signals of the BDS-3 system,the data observation from 1 to 7 days of the DOY-Day of 2022 are selected from 11 ICS stations to analyze the terms of data integrity rate,cycle-slip ratio,signal-to-noise ratio and multipath pseudo-range.The results show that the B2a signal is better than B1C signal in terms of data integrity rate,signal-to-noise ratio and multipath pseudo-range;the data integrity rate and multipath errors of the B2b signal are between those of the B1C and B2a;the B2b signal is the strongest;the data integrity rate and signal-to-noise ratio of the BDS-3 system are at the same level as those of the GPS and Galileo satellite navigation systems;the BDS-3 system is inferior to GPS and Galileo in terms of multipath pseudo-range.In the term of cycle-slip ratio,all the 11 used observation stations can meet the requirements of the specifications.