Research on BDS-3 B1C/B2a long baseline relative positioning
To verify the accuracy of the long baseline relative positioning of B1C/B2a signals from the BeiDou-3 Navigation Satellite System (BDS-3),this study firstly conducts a data quality analysis of the continuous 10day observation data from 8 Multi-GNSS experiment ( MGEX) stations in the Australian region for day of year ( DOY) ( 304～313) in 2023. Then,an improved GAMIT 10. 76 software is used to perform long baseline relative positioning solutions on the observation data. Finally,the quality of theBDS-3 and GPS signal combination data at different frequency points and the accuracy of dual-frequency ionosphere-free linear combination baseline solutions and network adjustments are evaluated. The experimental results show that the data quality,signal-to-noise ratio,and pseudorange multipath error of B1C/B2a,B1C/B2b,and B1C/B3I frequency signal combinations are comparable and superior to the L1/L2. The normalized root mean square( NRMS) of the B1C/B2a is slightly better than that of B1C/B2b and L1/L2 frequency points,significantly superior to the B1C/B3I. The ambiguity fixing rate of B1C/B2a and B1C/B2b is basically the same,significantly superior to the B1C/B3I,but inferior to the L1/L2. Furthermore,the experimental results indicate that compared to the B1C/B3I,the average standard deviation( STD) of the baseline components east( E),north( N),and up( U) and the average 3D positioning error of B1C/B2a are reduced by 29.4％,27.0％,30.0％,and 41.0％,respectively.
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