非差/双差模式GNSS精密定轨处理策略对比及精度分析  

Processing Strategy Comparison and Accuracy Analysis of Zero-Difference/Double-Difference GNSS Precise Orbit Determination

作　　者：杨宇飞[1,2] 徐君毅 许扬胤 YANG Yufei;XU Junyi;XU Yangyin(Information Engineering University,Zhengzhou 450001,China;Beijing Satellite Navigation Center,Beijing 100094,China;32021 Troops,Beijing 100094,China)

机构地区：[1]信息工程大学 [2]北京卫星导航中心 [3]32021部队

出　　处：《测绘科学技术学报》2018年第3期221-225,230,共6页Journal of Geomatics Science and Technology

基　　金：国家重点研发计划项目(2016YFB0501700; 2016YFB0501701);国家自然科学基金项目(41374019)

摘　　要：介绍了非差/双差模式数据处理的原理及特点,重点分析了两种模式观测模型,梳理了计算流程的差异;基于全球均匀分布的89个IGS监测站7 d的GPS观测数据计算精密定轨,分析了轨道结果外符合精度、重叠轨道精度和天不连续性,并测试了两种模式的耗时。实验结果表明:两种差分模式的三维位置均方根误差均优于4 cm;非差模式径向、迹向和法向重叠轨道精度分别为0.9、1.4和1.0 cm,双差模式分别为0.7、1.7和1.5 cm;非差模式的天不连续性均值为4.3 cm,双差模式为4.8 cm。两种差分模式精度相当,但是非差模式的计算量小于双差模式,尤其是随着测站数量增加,优势更加明显。The principle and characteristics of zero-difference and double difference GNSS precise orbit determination are introduced,and the difference of observation model and calculation process are discussed.Then,the precise orbits are calculated based on the 7 days GPS observation of 89 IGS stations.The accuracy,orbital overlap difference and day discontinuity are analyzed and the time consumption is tested.The results show that the 3D RMSs of both ZD and DD models are less than 4 cm.Radial,along-track and cross-track orbital overlap difference RMS of ZD model are about 0.9 cm,1.4 cm and 1.0 cm,and those of DD model are 0.7 cm,1.7 cm and 1.5 cm respectively.Discontinuities positional difference of ZD model is 4.3 cm,and 4.8 cm for that of DD model.POD accuracies of the two differential models are equivalent.However,the computing time of the zero-difference model is much shorter,especially as the number of stations increases.

关 键 词：非差 双差 全球导航卫星系统 精密定轨 精度分析 

分 类 号：P228[天文地球—大地测量学与测量工程]