北斗三号PPP-B2b信号精密单点定位服务可用性分析  

Availability analysis of BDS-3 PPP-B2b real-time precise point positioning service

作　　者：许扬胤 任夏 明锋 XU Yangyin;REN Xia;MING Feng(State Key Laboratory of Geo-Information Engineering,Xi’an 710054,China;Xi’an Research Institute of Surveying and Mapping,Xi’an 710054,China)

机构地区：[1]地理信息工程国家重点实验室,西安710054 [2]西安测绘研究所,西安710054

出　　处：《全球定位系统》2024年第3期10-19,共10页Gnss World of China

基　　金：国家自然科学基金基础科学中心项目(42388102);地理信息工程国家重点实验室基金(SKLGIE2022-ZZ-02)。

摘　　要：针对北斗三号(BeiDou-3 Navigation Satellite System,BDS-3)PPP-B2b信号精密单点定位(precise point positioning,PPP)服务可用性,以改正参数的可用性比例、平均可用卫星数和改正参数匹配性为指标进行了系统分析.结果表明:在中国及周边地区,BDS-3 PPP-B2b信号改正参数的可用性在71%~95%,且在北京地区达到最大,GPS改正参数可用性在68.5%~88.6%,差于BDS-3.中国及周边地区用户缺少PPP-B2b信号改正参数的卫星观测弧段主要集中在低高度角时段,其改正参数的可用性随着截止高度角的增大而增大;BDS-3、GPS和BDS-3/GPS在中国及周边地区的改正数可用平均卫星数分别约为8颗、7颗和15颗,可以确保有效的实时PPP(real time PPP,RT-PPP)服务性能,但平均约有1颗BDS-3卫星和2颗GPS卫星因为缺少PPP-B2b信号改正参数而无法参与RT-PPP服务;对于赤道以南地区,单个系统基本无法提供有效的PPPB2b服务,其改正参数的平均可用性低于50%,但BDS-3/GPS双系统在部分低纬度地区可提供约7~11颗的可用卫星;由于轨道改正参数和钟差改正参数更新频率不一致,在钟差改正数版本号(IOD Corr)参数更新时,会出现短暂的改正参数不匹配情况.Aiming at the availability of BDS-3 PPP-B2b service,a systematic analysis has been conducted towards the availability ratio of PPP-B2b corrections,the average number of satellites with available corrections and the matching characteristics of PPP-B2b corrections.The results show that in China and surrounding areas,the availability of BDS-3 PPP-B2b corrections is between 71%and 95%,and reaches the maximum in Beijing.While that for the GPS system is between 68.5%and 88.6%,which is worse than the BDS-3.The satellite observation arcs lack of PPP-B2b corrections are mainly concentrated in low elevation angle periods for users in China and surrounding areas,and the availability of PPP-B2b corrections will increase with the increase of cut-off elevation angle.The average number of satellites with available PPP-B2b corrections for BDS-3,GPS and BDS-3/GPS systems in China and surrounding areas is about 8,7 and 15 respectively,which can ensure effective real-time PPP service performance.However,on average,about 1 BDS-3 satellite and 2 GPS satellites cannot participate in the real-time PPP positioning due to the lack of PPP-B2b corrections for users in the area.For areas south of the equator,BDS-3 only or GPS-only system is basically unable to provide effective real-time PPP services with the average availability of PPPB2b correction being less than 50%,but the BDS-3/GPS dual system can provide about 7 to 11 available satellites in some low latitude areas.Users should be noticed that there will be a temporary mismatching state between the orbit and clock offset corrections each time when the IOD Corr parameter changes due to the different updating frequency.

关 键 词：北斗三号(BDS-3) PPP-B2b信号改正参数 实时精密单点定位(RT-PPP) 可用性 可用卫星数 匹配性 

分 类 号：P228.41[天文地球—大地测量学与测量工程]