摘要
针对提高多频模糊度固定解的GNSS精密单点定位的可靠性与稳定性的问题,该文基于实时非组合相位偏差产品,对三频非差非组合GPS/Galileo PPP的浮点解、固定解模型进行深入研究,并设计了3种定位策略,选取了17个MGEX跟踪站7d的实测数据,分析了三频非差模糊度固定解对静态、仿动态PPP定位精度与滤波收敛时间的影响。结果表明,滤波收敛后,与浮点解策略相比较,固定三频模糊度对高程、水平方向定位精度均有提高,在静态定位模式中提升幅度分别约为20.45%和37.50%,在仿动态定位模式中提升幅度分别约为22.41%和33.33%。在滤波收敛时间方面,相较于浮点解策略的收敛时间,静态与仿动态定位中模糊度固定策略的收敛时间分别提升了约12.57%和6.41%。
In order to improve the reliability and stability of precise point positioning(PPP)based on the multi-frequency integer ambiguity resolution(AR),the float-ambiguity and fixed-ambiguity of triplefrequency undifferential and uncombined observations PPP model were analyzed based on uncombined phase biases in this paper.To verify the effectiveness and performance of triple-frequency PPP AR in the static and kinematic model,datasets from 17 Multi-GNSS Experiment(MGEX)lasting for 7 days were analyzed with three data processing methods.Numerous experiment results showed that the triple-frequency PPP AR method could improve significantly the positioning precision in the vertical and horizontal direction after filter convergence,compared with the float-ambiguity method,the improvement rate reached 20.45% and 37.50%in the static positioning model,and the improvement rate reached 22.41% and 33.33%in the kinematic model.In terms of convergence time,the improvement rate reached 12.57% and 6.41%in the static and kinematic model respectively in comparison to float-ambiguity method.
作者
吕伟才
高井祥
刘天骏
LV Weicai;GAO Jingxiang;LIU Tianjun(School of Geomatics,Anhui University of Science&Technology,Huainan,Anhui 232001,China;Key Laboratory of Aviation-aerospace-ground Cooperative Monitoring and Early Warning of Coal Mining-induced Disasters of Anhui Higher Education Institutes,Huainan,Anhui 232001,China;School of Environmental Science and Spatial Informatics,China University of Mining and Technology,Xuzhou,Jiangsu 221116,China)
出处
《测绘科学》
CSCD
北大核心
2019年第11期195-204,共10页
Science of Surveying and Mapping
基金
国家自然科学基金项目(41474026)
淮南矿业(集团)有限责任公司项目(HNKY-JTJS(2018)-178,HNKY-JTJS(2017)-122,HNKY-JTJS(2013)-28)
关键词
整数相位钟
实时精密单点定位
非差模糊度固定
非差非组合
integer phase clock
real-time precise point position(PPP)
undifferenced integer ambiguity resolution
undifferential and uncombined observations
