北斗卫星导航系统Klobuchar模型精度评估  

Evaluation on the Precision of Klobuchar Model for BeiDou Navigation Satellite System

作　　者：张强[1] 赵齐乐[1] 章红平[1] 胡志刚[1] 伍岳[2] 

机构地区：[1]武汉大学卫星导航定位技术研究中心,湖北武汉430079 [2]三峡大学土木与建筑学院,湖北宜昌443002

出　　处：《武汉大学学报（信息科学版）》2014年第2期142-146,共5页Geomatics and Information Science of Wuhan University

基　　金：国家自然科学基金资助项目(41231174;41004010);高等学校学科创新引智计划资助项目(B07037)~~

摘　　要：目前,我国北斗卫星导航系统已完成星座区域组网,系统每2h提供一组电离层延迟Klobuchar模型参数。利用欧洲定轨中心(CODE)的高精度电离层格网数据作为参考,对北斗卫星导航系统电离层参数性能进行了精度评估分析,并进行了定位分析。数据表明,其修正精度一般在70%以上,北半球的修正误差在1.5m左右,而南半球的修正误差在3.5m左右;在北半球中纬度地区的修正精度比高纬度、低纬度地区高;北斗单频伪距定位采用北斗Klobuchar模型在平面上的精度为3m左右,高程上为7m左右,与采用GPS的Klobuchar模型相比较,定位精度提高了约10%,高程方向尤为明显。At present, China＇s BeiDou Navigation Satellite System （BDS） has completed a constellation of regional network. The system provides a set of ionospheric parameters for the BeiDou Klobuchar model every two hours. Using a high precision GIM model for CODE as a reference, the performance of ionospheric parameters and positioning assessment of BDS are evaluated. The data shows that correction accuracy is generally 70% or more, the correction error in the Northern Hemisphere is about 1.5 meters, and 3.5 meters in the Southern Hemisphere. In the Northern Hemisphere, the correction precision in mid-latitude region is higher than high-latitude and low-latitude region. The precision for BDS SPP on frequency B1 is about 3 meters in the horizontal direction, and about 7 meters in the vertical direction using BDS Klobuchar model. In comparison to use GPS Klobuchar model, precision increased by about 10 percent, especially in the vertical direction.

关 键 词：北斗卫星导航系统 电离层 KLOBUCHAR模型 格网模型 单点定位中图法 

分 类 号：P228.41[天文地球—大地测量学与测量工程]