BDS-3 precise point positioning applied to railway survey
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摘要: 为研究第三代北斗卫星导航系统(BDS -3,BeiDou Navigation Satellite System-3 )精密单点定位技术(PPP ,Precise Point Positioning)在铁路勘测应用中的可行性,文章推导了BDS-3任意双频非差非组合PPP通用函数模型,并采用该模型对BDS-3卫星B1I、B3I、B1C和B2a信号形成的5种双频组合进行PPP解算和性能分析,利用某铁路观测数据,对BDS-3进行PPP解算。结果表明, 所有观测时段内可见卫星数约为7~11颗,空间位置精度因子(PDOP,Position Dilution of Precision)值约为2.0,可见卫星数较多,且空间几何分布良好;在静态和仿动态解算模式下,在水平和高程方向均可实现厘米级的定位精度。该研究可为BDS-3精密单点定位技术在铁路勘察中的应用提供参考。Abstract: In order to study the feasibility of BeiDou Navigation Satellite System (BDS)-3 Precise Point Positioning (PPP) in railway survey application, this paper used BDS-3 satellite observation data to deduce BDS-3 arbitrary dual-frequency undifferenced and uncombined PPP universal function model. By using this model, the paper carried out the PPP solutions and performance analysis of five dual-frequency combinations formed by BDS-3 satellite signals B1I, B3I, B1C and B2a, and used a railway observation data to calculate BDS-3 PPP. The results show that the number of visible satellites is about 7~11, and the spatial Position Dilution of Precision (PDOP) is about 2.0 during the observation period. The number of visible satellites is large and the spatial geometry distribution is good. BDS-3 can achieve centimeter-level positioning accuracy in both horizontal and elevation directions in static and pseudo-dynamic solution modes. This study can provide reference for the application of BDS-3 precision point positioning technology in railway survey.
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表 1 5种双频组合12个测站静态解平均RMSE和收敛时间
组合频点 定位精度RMSE/cm 收敛时间/min E N U B1I/B3I 1.4 1.0 2.2 37 B1C/B2a 1.9 1.4 2.6 103 B3I/B1C 1.7 1.4 6.2 72 B3I/B2a 2.7 1.7 8.0 205 B1I/B2a 2.0 1.5 2.5 87 表 2 5种双频组合12个测站动态解平均RMSE和收敛时间
组合频点 定位精度RMSE/cm 收敛时间/min E N U B1I/B3I 3.0 2.7 5.7 49 B1C/B2a 5.7 4.8 12.8 182 B3I/B1C 3.7 3.0 10.9 126 B3I/B2a 18.9 15.6 32.6 332 B1I/B2a 5.8 5.6 12.1 194 -
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