TGD改正对BDS-3新频点单点定位的影响分析  

Influence of Timing Group Delay on BDS-3 New Signals Single Point Positioning

作　　者：杜彦君 贾小林[2] 姚顽强[1] 李佳豪 DU Yanjun;JIA Xiaolin;YAO Wanqiang;LI Jiahao(College of Geomatics,Xi’an University of Science and Technology,58 Mid-Yanta Road,Xi’an 710054,China;Xi’an Institute of Surveying and Mapping,1 Mid-Yanta Road,Xi’an 710054,China;School of Geological Engineering and Geomatics,Chang’an University,126 Yanta Road,Xi’an 710054,China)

机构地区：[1]西安科技大学测绘科学与技术学院,西安市710054 [2]西安测绘研究所,西安市710054 [3]长安大学地质工程与测绘学院,西安市710054

出　　处：《大地测量与地球动力学》2023年第5期447-451,共5页Journal of Geodesy and Geodynamics

基　　金：国家自然科学基金(41874041)。

摘　　要：为探究BDS-3单、双频SPP TGD改正对定位的影响,选取10个MGEX测站连续30 d的观测数据进行SPP实验。结果表明,BDS-3 DCB产品在1个月内的日解值稳定,未出现明显跳变,月稳定性优于0.2 ns。TGD参数与DCB产品的符合度较高,大部分卫星差异优于2 ns。单、双频SPP经TGD校正后水平和高程方向上的精度均大幅提升,其中单频SPP提升率为17%~70%,双频SPP提升率为66%~90%,可见硬件延迟偏差对单点定位的影响较大,在定位解算中不可忽视。To explore the influence of BDS-3 single-and dual-frequency SPP TGD correction on positioning,we select the observation data of 10 MGEX stations for 30 days to carry out SPP experiments.The results show that the BDS-3 DCB product is stable within one month without noticeable jumps,and the monthly stability is better than 0.2 ns.The TGD parameters are more consistent with the DCB products,and most satellite differences are better than 2 ns.After TGD correction,the accuracy of single-frequency and dual-frequency SPP is greatly improved in both horizontal and vertical components.The improvement rate of single-frequency SPP is 17%to 70%,and dual-frequency SPP is 66%to 90%.The hardware delay deviation has a great influence on single point positioning and cannot be ignored in the positioning solution.

关 键 词：北斗三号系统 时间群延迟 差分码偏差 单点定位 定位精度 

分 类 号：P228[天文地球—大地测量学与测量工程]