北斗卫星导航系统Klobuchar模型精度评估
Evaluation on the Precision of Klobuchar Model forBeiDou Navigation Satellite System
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摘要: 目的 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 Klo-buchar模型相比较,定位精度提高了约10%,高程方向尤为明显。Abstract: Objective At present,China’s BeiDou Navigation Satellite System(BDS)has completed a constella-tion of regional network.The system provides a set of ionospheric parameters for the BeiDou Klobu-char model every two hours.Using a high precision GIM model for CODE as a reference,the perform-ance of ionospheric parameters and positioning assessment of BDS are evaluated.The data shows thatcorrection accuracy is generally 70% or more,the correction error in the Northern Hemisphere isabout 1.5meters,and 3.5meters in the Southern Hemisphere.In the Northern Hemisphere,the cor-rection precision in mid-latitude region is higher than high-latitude and low-latitude region.The preci-sion for BDS SPP on frequency B1is about 3meters in the horizontal direction,and about 7meters inthe vertical direction using BDS Klobuchar model.In comparison to use GPS Klobuchar model,preci-sion increased by about 10percent,especially in the vertical direction.
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