区域电离层建模的单频伪距定位验证  

Single-frequency pseudo-range positioning validation based on regional ionospheric modeling

作　　者：胡弦[1] 郑福[1] 梅懿芳 王印彤 

机构地区：[1]武汉大学卫星导航定位技术研究中心,武汉430079 [2]湖北省地图院,武汉430074

出　　处：《测绘科学》2017年第4期43-47,共5页Science of Surveying and Mapping

基　　金：国家自然科学基金青年项目(41504028);湖北省自然科学基金青年项目(2015CFB326)

摘　　要：针对电离层单层模型无法满足单频用户定位精度要求的问题,该文建立了区域电离层斜路径模型和单星多项式函数模型。基于河北省区域CORS站的实验结果表明:该文建立的区域电离层模型的拟合精度比CODE中心的格网电离层模型提高了近80%。并将其应用于北斗、GPS单频伪距单点定位,得出北斗的单点定位高程和平面定位精度分别优于3和2m,GPS的单点定位高程和平面定位精度分别优于1.5和1m;相对于CODE,GPS和北斗在平面及高程方向的定位精度均提高了50%左右。结果证明,采用斜路径电离层模型和多项式函数模型,可以较好地反映区域电离层的精细结构。Aiming at the problem that the single-layer ionospheric model cannot meet the positioning accuracy for single-frequency user, the regional slant ionospheric model and single satellite polynominal function model were proposed in this paper. Experimental results of the observation of CORS in Hebei province showed that comparing with the GIM model of CODE, the fitting precision of regional ionospher- ic model increased by 80%. The accuracy of SPP applying the regional slant ionosphere model could reach within 3 m in vertical direction and 2 m in horizontal direction for BDS and less than 1.5 m in vertical direc- tion and 1 m in horizontal direction for GPS; comparing with CODE, the improvements in vertical direc- tion and horizontal direction exceed by 50% for GPS and BDS. The models can improve the phenomenon of accuracy losing by using traditional single-layer ionospheric model and reveal regional ionospheric fine structure.

关 键 词：斜路径电离层模型 单星多项式函数模型 非差非组合观测值 单频伪距单点定位 

分 类 号：P223[天文地球—大地测量学与测量工程]