Performance Analysis of BDS-3/GPS/Galileo Compatible Frequency Tight Combination Short Baseline
In view of the application of tight combination models in short baseline relative positioning,based on the real-time data of short baseline continuous multi-day observations composed of MGEX tracking stations,the BDS-3/GPS,BDS-3/Galileo,and BDS-3/GPS/Galileo compatible frequency tight combination short baseline relative positioning accuracy were compared and analyzed. The experimental results show that the three combined short baseline relative positioning accuracy are all at the centimeter level,and the three system combined positioning accuracy is better than the dual system combined positioning accuracy. The tight combination short baseline relative positioning accuracy has a significant improvement compared to the loose combination model,with a maximum im-provement of 18.04％ in the BDS-3/Galileo combined E direction accuracy,and the remaining improvement accuracy is below 10％.
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