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.
出处
《武汉大学学报（信息科学版）》
EI
CSCD
北大核心
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)~~
