北斗三号PPP-B2b独立定位分析与应用

Study on the standardized application of BeiDou-3 PPP-B2b service in natural resource surveying

自然资源勘探会面临网络通讯设施、地基CORS无法完全覆盖导致定位精度不足的问题,北斗三号卫星导航系统可为中国及其周边区域提供精密单点定位(PPP)改正数服务(PPP-B2b服务),使得用户无需借助CORS和移动通信网络即可实现高精度定位。本文基于PPP-B2b服务评估了无公网区域的PPP定位性能:①评估了PPP-B2b服务的改正数精度,GPS轨道误差改正数均值为0.25 m,标准差为0.28 m;BDS轨道误差改正数均值为0.22 m,标准差为0.45 m,GPS和BDS两个GNSS系统卫星钟差精度一致,均值分别为0.09 ns、0.11 ns,标准差为0.02 ns、0.05 ns,卫星伪距硬件延迟改正数变化稳定,一天内误差为0.04 ns;②评估了动态与静态PPP定位性能,结果表明PPP在15 min后定位精度可达厘米级,在1 h后可以稳定至5 cm以内,动态定位结果显示,无公网条件下开阔环境定位误差均值为0.12 m,标准差为0.10 m。试验结果显示在无公网条件下,利用北斗三号PPP-B2b服务可以提供静态厘米级、动态分米级的定位结果,很好地满足自然资源勘探的要求。

Current natural resource exploration is moving towards complex areas.However,it faces the problem of insufficient positioning accuracy due to incomplete coverage of network communication facilities and ground-based CORS.The Beidou-3 satellite navigation system can provide precise single-point positioning correction services for China and its surrounding areas,enabling users to achieve high-precision positioning without relying on CORS and 4G mobile communication networks.The PPP positioning performance of non-public network areas are evaluated based on PPP-B2b services:①The correction accuracy of PPP-B2b service is evaluated.The mean value of BDS orbit error correction number is 0.22 m with the standard deviation of 0.45 m.The mean value of BDS orbit error correction number is 0.22 m with the standard deviation of 0.45 m.The satellite clock error accuracy of GPS and BDS of GNSS systems is consistent,with a mean value of 0.09 ns、0.11 ns and a standard deviation of 0.02 ns、0.05 ns.The hardware delay correction number of satellite pseudorange is stable with a daily error of 0.04 ns.②The PPP positioning performance at dynamic and static is evaluated,and the results show that the positioning accuracy of PPP can reach centimeter level after 15 minutes,and can be stabilized within 5 cm after 1 hour.The dynamic positioning results show that under non-public network conditions,the mean value of positioning error in open environment is 0.12 m and the standard deviation is 0.10 m.The experimental results show that under non-public network conditions,Beidou-3 PPP-B2b service can provide positioning results of static centimeter-level and dynamic decimeter-level,which well meet the requirements of natural resource exploration and provide research basis for the formulation of application standards for Beidou-3 PPP-B2b services in the field of natural resources.