摘要
北斗二号系统作为一种区域定位系统在其服务核心区域内发挥了越来越重要的作用,对于北斗二号系统非核心区域定位精度影响因素的研究也变得越来越重要。本研究使用GAMIT/GLOBK软件解算由多GNSS实验项目(MGEX)提供的位于北斗二号系统非核心区的17个IGS站数据,研究了不同精密星历以及基线解算策略中的干湿映射函数、观测量选择、卫星高度截止角、对流层天顶延迟估计时间间隔对北斗二号系统在非核心区域定位精度的影响。实验结果表明:北斗二号系统非核心区域定位标准差精度达到分米级;利用GAMIT/GLOBK软件对实验区域北斗数据进行解算时,使用欧洲定轨中心(CODE)提供的精密星历,干湿映射函数采用NMF函数,观测量采用电离层约束求解宽巷模糊度,卫星高度截止角设置为12°,对流层天顶延迟估计时间间隔设置为1 h,解算精度较高。制约北斗二号系统非核心区域定位精度的主要原因是非核心区域测站可观测到的北斗二号卫星数太少。研究表明,精密星历、干湿映射函数、观测量选择、卫星高度角设置和对流层天顶延迟估计时间间隔会影响北斗二号系统非核心区的定位精度,通过选择合适的精密星历和基线解算策略能够提高定位精度。
As a regional positioning system,BeiDouⅡsystem playing an increasingly important role in its core area services,research on factors affecting the positioning precision in non-core area of BeiDouⅡhas also become more and more significant.In this study,GAMIT/GLOBK software was used to process the data provided by MGEX of 17 IGS stations located in the non-core area of BeiDouⅡsystem.Factors affecting the positioning precision of BeiDouⅡin the non-core area were analyzed,including different precise ephemeris,mapping functions,choices of observation,satellite cut-off elevation angles,and time intervals on zenith tropospheric delay estimation.The results show that the standard deviation reaches the decimeter level.A higher positioning precision can be achieved by using the precise ephemeris provided by CODE,solving broad lane ambiguity based on ionospheric constraint,selecting NMF mapping function,and setting the satellite cut-off elevation angle as 12°and the time interval of zenith tropospheric dalay estimation as 1 h.The main reason for the lower positioning precision in non-core area of BeiDouⅡsystem is that only a few number of BeiDouⅡsatellites can be observed.The research shows that the positioning precision in non-core area of BeiDouⅡsystem were affected by the precise ephemeris,wet and dry mapping functions,choice of observation,satellite cut-off elevation angle,and time interval on zenith tropospheric delay,but it can be improved by selecting suitable precise ephemeris and baseline solution strategy.
作者
侯睿
郭金运
周茂盛
刘新
纪兵
刘智敏
HOU Rui;GUO Jinyun;ZHOU Maosheng;LIU Xin;JI Bing;LIU Zhimin(College of Geodesy and Geomatics,Shandong University of Science and Technology,Qingdao,Shandong 266590,China;Department of Navigation Engineering,Naval University of Engineering,Wuhan,Hubei 430033,China)
出处
《山东科技大学学报（自然科学版）》
CAS
北大核心
2021年第1期8-16,共9页
Journal of Shandong University of Science and Technology(Natural Science)
基金
国家自然科学基金项目(41774001,41374009,41774021)
国家科技基础性工作专项(2015FY310200)。
