北斗全球系统广播电离层模型性能初步评估

Preliminary Performance Evaluation of BeiDou Global Ionospheric Delay Correction Model

北斗三号系统于2017年正式启动建设,将采用新的北斗全球电离层延迟修正模型(BeiDou global ionospheric delay correction model, BDGIM)。使用高精度格网电离层数据和双频实测电离层延迟数据作为参考,对北斗试验卫星系统播发的BDGIM模型精度进行了相应分析和评估,并与北斗Klobuchar和GPS Klobuchar模型精度进行了比较。研究结果表明,在中国区域,BDGIM模型和北斗Klobuchar模型精度相当,优于GPS Klobuchar模型;在全球范围内,BDGIM模型精度优于北斗Klobuchar和GPS Klobuchar模型。采用不同电离层模型进行伪距单频单点定位,并对定位结果进行对比分析,结果显示,使用BDGIM模型比北斗Klobuchar模型的定位精度有13%的提高,比GPS Klobuchar模型有7%~10%的提高。

The BeiDou global navigation system was officially launched in 2017 and will adopt a new BeiDou global ionospheric delay correction model(BDGIM).Using high-precision grid ionospheric data released by CODE and the Slant ionospheric delay derived from dual-frequency observations as a reference,the accuracy of the BDGIM model is analyzed and evaluated,and compared with the BeiDou Klobuchar and GPS Klobuchar models.The results show that in the region of China,the BDGIM model and the BeiDou Klobuchar model are comparable in accuracy and superior to the GPS Klobuchar model.On a global scale,the accuracy of the BDGIM model is better than that of the BeiDou Klobuchar and the GPS Klobuchar models.Different ionospheric models are implemented for single point positioning.The results show that the BDGIM model has a 13%improvement over the positioning accuracy of the BeiDou Klobuchar model,and a 7%-10%improvement over the GPS Klobuchar model.