NTCM广播电离层模型性能评估

Performance Analysis of NTCM Ionospheric Broadcast Models

对于全球卫星导航系统单频用户而言,广播电离层模型是改正电离层误差的主要方法之一。对NTCM-BC模型、MNTCM-BC模型、NTCM-Klobuchar模型和传统Klobuchar模型的性能进行了对比分析。结果表明,在一个太阳活动周期内,NTCM-BC和MNTCM-BC模型计算的垂直总电子含量精度相当,且精度最高,NTCM-Klobuchar模型次之,Klobuchar模型最低。在低纬度测站,NTCM系列模型较Klobuchar模型最高能减少20 TECU左右的误差。与Klobuchar模型相比,采用NTCM-BC和MNTCM-BC模型进行伪距单点定位,高程精度提高约38%,特别是太阳活动高峰期间,低纬度测站最高能提高3 m左右。

The performance of NTCM-BC model,MNTCM-BC model,NTCM-Klobuchar model and traditional Klobuchar model are compared and analyzed.The results show that:In a solar cycle,the accuracy of the vertical total electron content calculated by the NTCM-BC model and MNTCM-BC model is consistent and the highest,followed by the NTCM-Klobuchar model and the Klobuchar model is the lowest.At low-latitude stations,the NTCM models can reduce the error about 20 TECU compared with the Klobuchar model at most.In comparison to use the Klobuchar model,the single point positioning using NTCM-BC and MNTCM-BC model can improve the height accuracy of about 38%,especially at low-latitude stations,the maximum can be reduced by about 3 m.