附加GGOS对流层产品约束的PPP-AR模型及精度分析  

PPP-AR with additional GGOS tropospheric grid product constraints and accuracy analysis

作　　者：庞宇奇 秘金钟[2] 谷守周[2] 李博 陈一彪 PANG Yuqi;BEI Jinzhong;GU Shouzhou;LI Bo;CHEN Yibiao(College of Geodesy and Geomatics,Shandong University of Science and Technology,Qingdao,Shandong 266590,China;Chinese Academy of Surveying and Mapping,Beijing 100036,China;Beijing Fangshan Satellite Laser Ranging National Observation and Research Station,Beijing 102488,China)

机构地区：[1]山东科技大学测绘与空间信息学院,山东青岛266590 [2]中国测绘科学研究院,北京100036 [3]北京房山人卫激光国家野外科学观测研究站,北京102488

出　　处：《测绘科学》2023年第2期28-35,共8页Science of Surveying and Mapping

基　　金：国家重点研发计划项目(2021YEC3000504);国家自然基金重点基金项目(41930535);全球连续监测评估系统项目(CFZX0301040308-06);自然资源部国土卫星遥感应用重点实验室基金项目(KLSMNR-202109)。

摘　　要：针对因估计对流层延迟导致固定模糊度的精密单点定位(PPP-AR)收敛时间长的问题,该文基于全球大地测量观测系统(GGOS)格网产品,利用双线性二次内插的方法构建了顾及高程补偿的对流层延迟虚拟观测值,提出了一种顾及高程补偿附加对流层约束的PPP-AR方法。将其与传统估计对流层延迟值的PPP-AR及附加国际GNSS服务(IGS)对流层产品约束的PPP-AR进行对比,分别从定位精度、收敛时间和模糊度固定率3个方面进行了分析。结果表明:与传统估计对流层延迟相比,该文提出的方法在U方向定位精度提升明显,平均可提升2.94 cm,提升11.2%;收敛时间平均缩短14.5%;模糊度固定率平均提升1.9%。To address the problem of long convergence time of PPP-AR(precise point positioning-ambiguity resolution)due to the estimated tropospheric delay,a bilinear quadratic interpolation method was used to construct virtual observations of tropospheric delay with elevation compensation based on the GGOS(global geodetic observing system)grid product,and a PPP-AR method with elevation compensation and tropospheric constraints was proposed in this paper.It was compared with the traditional PPP-AR for estimating tropospheric delay and the PPP-AR with additional IGS tropospheric product constraint in terms of localization accuracy,convergence time and ambiguity fixation rate,respectively.The results showed that compared with the traditional estimation of tropospheric delay,the proposed method could significantly improve the localization accuracy in the U-direction by 2.94cm and 11.2%on average;shorten the convergence time by 14.5%on average;and improve the ambiguity fixation rate by 1.9%on average.

关 键 词：固定模糊度 对流层建模 附加对流层约束 双线性二次内插 

分 类 号：P228.4[天文地球—大地测量学与测量工程]