北斗三号高精度载波相位差分定位算法

Beidou-3 high-precision carrier phase difference positioning algorithm

针对北斗三号系统(BDS-3)全星座、多频率差分定位相关研究不足等问题,构建基于多频观测值的载波相位差分定位模型,并利用连续运行参考站(CORS)网络的实测数据以及实测车载动态数据对算法进行验证。研究表明:在静态定位模式下,双频组合中的B1CB2a在定位精度上表现最佳,与B1CB2a相比,三频组合B1CB2a B3I在N、E、U三个方向的定位精度分别提高了16%~41%、2%~62%、7%~47%;在动态定位模式下,三频组合B1CB2a B3I在N、E、U三个方向的定位精度分别提高了53%~61%、52%~75%、51%~53%。B1CB2a、B1CB2aB3I可分别在静态、动态定位模式下实现厘米级、亚米级的定位精度以及模糊度的快速准确固定,显著提高定位系统的性能和可靠性,在智能交通、无人机导航、精准农业等领域具有广阔的应用前景。

In light of the insufficiency in the relevant research on the full constellation and multi-frequency differential positioning of the Beidou-3 System(BDS-3),this paper establishes a carrier phase differential positioning modelbased on multi-frequency observations and validates the algorithm by utilizing the measured data from the continuous operational reference station(CORS)network and the real vehicle-mounted dynamic data.The results indicate that in the static positioning mode,the B1CB2a combination among the dual-frequency combinations demonstrates the best positioning accuracy.Compared with B1CB2a,the three-frequency combination B1CB2aB3I has enhanced the positioning accuracy in the N,E,and U directions by 16%to 41%,2%to 62%,and 7%to 47%,respectively,in the static positioning mode.In the dynamic positioning mode,the three-frequency combination B1CB2aB3I has increased the positioning accuracy in the N,E,and U directions by 53%to 61%,52%to 75%,and 51%to 53%,respectively.B1CB2a,B1CB2aB3I can achieve centimeter-level and sub-decimeter-level positioning accuracy and fast and accurate fixing of ambiguity in static and dynamic positioning modes,significantly improving the performance and reliability of the positioning system.They have broad application prospects in smart transportation,drone navigation,and precision agriculture.