轨道与钟差对低轨导航增强PPP性能影响分析  

Analysis on Influence of Orbit and Clock Errors on PPP Performance in LEO Navigation Augmentation

作　　者：杨轩 刘天立 蔚保国[1] 谢松[1] 孙一雄 伍蔡伦[1] 陈秀德 YANG Xuan;LIU Tianli;YU Baoguo;XIE Song;SUN Yixiong;WU Cailun;CHEN Xiude(The 54th Research Institute of CETC,Shijiazhuang 050081,China)

机构地区：[1]中国电子科技集团公司第五十四研究所,河北石家庄050081

出　　处：《无线电工程》2023年第5期1000-1006,共7页Radio Engineering

基　　金：中国电子科技集团公司第五十四研究所专项基金项目(SCX20684X012)。

摘　　要：利用低轨卫星进行导航增强是实现精密单点定位(Precise Point Positioning, PPP)快速收敛的有效途径之一。针对低轨卫星轨道与钟差误差对增强PPP性能的影响,推导了适用于低轨卫星的空间信号测距误差(Signal in Space Ranging Error, SISRE)计算公式,并基于低轨SISRE开展仿真试验,讨论低轨轨道与钟差误差对PPP的贡献。仿真结果显示,低轨SISRE与中高轨卫星存在显著不同,其切向和法向占比最高可达30%以上,同时SISRE显著影响PPP的收敛时间。为了保证北斗与低轨联合PPP的性能,SISRE最好应小于0.06 m,最大不超过0.20 m。LEO navigation augmentation is one of the effective ways to achieve rapid convergence of Precise Point Positioning(PPP).The Signal in Space Ranging Error(SISRE)formula for LEO satellite is derived to analyze the influence of LEO satellite orbit and clock errors on PPP positioning performance.Based on different LEO SISREs,some simulations are conducted.The simulation results show that the LEO SISRE is significantly different from that of MEO and GEO satellites.The percentage of tangential and normal direction of LEO SISRE can be up to more than 30%.The results also indicate that LEO SISRE significantly affects the convergence time of PPP.In order to ensure the performance of BDS+LEO PPP,the SISRE should preferably be less than 0.06 m and the maximum should not exceed 0.20 m.

关 键 词：低轨导航增强 精密单点定位 空间信号测距误差 收敛时间 

分 类 号：P228.4[天文地球—大地测量学与测量工程]