顾及不同LEO卫星数量及轨道误差的GPS/LEO联合PPP  

Combined GPS/LEO PPP:Considering the Number of Different Satellites and Orbit Errors

作　　者：岳恒屹 李凯[2] 胡小工[2] 唐成盼[2] 郭鹏[2] YUE Hengyi;LI Kai;HU Xiaogong;TANG Chengpan;GUO Peng(College of Geodesy and Geomatics,Shandong University of Science and Technology,579 Qianwangang Road,Qingdao 266590,China;Shanghai Astronomical Observatory,CAS,80 Nandan Road,Shanghai 200030,China)

机构地区：[1]山东科技大学测绘与空间信息学院,青岛市266590 [2]中国科学院上海天文台,上海市00030

出　　处：《大地测量与地球动力学》2022年第11期1117-1121,共5页Journal of Geodesy and Geodynamics

基　　金：国家自然科学基金(11903064);上海市2021年度“科技创新行动计划”技术标准项目(21DZ2205300)。

摘　　要：为解决现有单系统GPS PPP收敛速度较慢的问题,选取不同卫星数量构成的LEO星座系统,根据观测值仿真原理得到待估点来自低轨卫星的伪距观测值和相位观测值;选取CPVG、WUH2、KOUG、IISC、FUCN测站,利用GPS及仿真附加轨道误差的LEO星座观测数据进行静态精密单点定位,以分析LEO星座的增强效果。结果表明:1)在原有GPS系统中加入LEO星座后,3种组合场景下平均可见卫星数量分别增加9.7、19.4、31.3颗,PDOP值分别减少0.7、0.9、1.1;2)收敛时间快速缩短,由单系统GPS卫星的17.1 min分别降至4.7 min、2.1 min、1.5 min,收敛时间分别缩短67.3%、84.4%、89.5%;3)E方向上的RMS值分别提升34.4%、59.4%、72.9%,N方向上分别提升37.4%、60.3%、67.3%,U方向上分别提升55.9%、71.7%、79.6%。LEO星座对GPS PPP的性能提升巨大,对于指导LEO星座增强GPS系统设计及拓展精密单点定位的应用场景具有一定价值。To solve the problem of the slow convergence speed of the existing single-system,GPS PPP,we select the LEO constellation system composed of different numbers of satellites.According to the observational value simulation principle,we obtain the pseudorange observations and phase observations of the points to be estimated from low-orbit satellites.To analyze the enhancement effect of LEO constellation,we select CPVG,WUH2,KOUG,IISC,FUCN stations,and use GPS and LEO constellation observation data with additional orbital error to perform static precise single-point positioning.The results show that:1)After adding the LEO constellation to the original GPS system,the average number of visible satellites increased by 9.7,19.4 and 31.3,and the PDOP value decreased by 0.7,0.9 and 1.1,respectively;2)The convergence time was shortened rapidly,the single system of GPS satellites were reduced from 17.1 min to 4.7 min,2.1 min,and 1.5 min,respectively,and the convergence time was shortened by 67.3%,84.4%,and 89.5%,respectively;3)The RMS value in the N direction was increased by 37.4%,60.3%,and 67.3%,respectively,the E direction increased by 34.4%,59.4%,and 72.9%,respectively,and the U direction increased by 55.9%,71.7%,and 79.6%.LEO constellation greatly improves the performance of GPS PPP,which is of great significance for guiding the design of LEO constellation enhanced GPS system and the expansion of application scenarios for precise single-point positioning.

关 键 词：LEO PPP 轨道误差 卫星数量 

分 类 号：P228[天文地球—大地测量学与测量工程]