GPS双差模糊度在实时精密单点定位中的应用  

Application of GPS double-difference ambiguity in real-time pecise point positioning

作　　者：刘小明 刘俊钊 李浩军 LIU Xiaoming;LIU Junzhao;LI Haojun(Geological Environment Monitoring Station of Guangxi Zhuang Autonomous Region,Wuzhou,Guangxi 543000,China;ASR Microelectronics(Shanghai)Co.,Ltd.,Shanghai 201203,China;College of Surveying and Geo-informatics,Tongji University,Shanghai 200092,China)

机构地区：[1]广西壮族自治区地质环境监测站,广西梧州543000 [2]翱捷科技(上海)有限公司,上海201203 [3]同济大学测绘与地理信息学院,上海200092

出　　处：《导航定位学报》2023年第1期134-141,共8页Journal of Navigation and Positioning

基　　金：国家自然科学基金项目(41974025,42174019);中央高校基本科研业务费专项资金资助项目。

摘　　要：针对小范围全球定位系统(GPS)实时精密单点定位(PPP)收敛速度慢、外部观测信息依赖较高等问题,提出一种适用于小范围的实时PPP应用算法:利用GPS非组合双频观测值计算单个PPP用户星间单差模糊度;通过引入少量参考站单差模糊度建立双差约束,消除卫星端小数偏差,从而恢复模糊度参数的整数特性;此外,通过该方法恢复的模糊度参数同双差观测模型解算的模糊度参数等价,可直接进行整数固定,提高PPP解算效率。实验结果表明,该方法可加快实时PPP参数收敛速度,提高PPP的最终收敛精度。Aiming at the problems of slow convergence speed and high dependence on external observation information in small-scale global positioning system(GPS)real-time precise point positioning(PPP),a real-time PPP application algorithm suitable for small-scale deformation monitoring is proposed.The method uses GPS uncombined dual-frequency observations to calculate the single-difference ambiguity between satellites of a single PPP user,establishes a double-difference constraint by introducing the single-difference ambiguity of the reference station,eliminates the satellite-side decimal deviation,and restores the integer characteristics of the ambiguity parameters.In addition,the ambiguity parameters recovered by this method are equivalent to the ambiguity parameters solved by the double-difference observation model,and can be directly fixed by integers to improve the efficiency of PPP solution.Finally,the IGS real-time observation station data is used to analyze the results.The data processing results show that this method can speed up the convergence speed of real-time PPP parameters and improve the final convergence accuracy of PPP.

关 键 词：精密单点定位 相位模糊度 定位精度 

分 类 号：P228[天文地球—大地测量学与测量工程]