利用标准单点定位技术评价电离层模型

针对电离层模型的评价问题,提出了标准单点定位的方法,验证了该方法的可行性,并深入分析了GIM模型/Klobuchar模型在空域、时域上对SPP定位精度的影响。实验结果表明:选择GIM模型或Klobuchar模型,中纬地区SPP定位精度最高,低纬地区最差。与Klobuchar模型相比,高、中、低纬地区选择GIM模型的三维定位精度均有较大幅度提升,最大改进达34.20%;在太阳活跃期、低谷期,GIM模型的三维定位精度也明显高于Klobuchar模型,且活跃期GIM模型相对Klobuchar模型的改进率达20.14%,比低谷期高12.25%。从定位精度看,SPP解算选择GIM模型整体优于采用Klobuchar模型。

Evaluation of ionospheric model based on standard point positioning technique

In order to evaluate the ionosphere model,the method of standard point positioning was introduced.Its feasibility is verified.GIM/Klobuchar model's effects on SPP were analyzed in different latitudes and different solar periods respectively.The results show that the SPP precision is the best in middle latitudes regardless of GIM model or Klobuchar model,the worst in the low latitudes.Compared with Klobuchar model,the 3D positioning accuracy is greatly improved with GIM model in all regions,which the maximum increase rate is up to 34.20％.The accuracy selecting GIM model is significantly better than Klobuchar model in all solar periods.Meanwhile,GIM model's increase rate reaches 20.14％ in active period which is 12.25％ higher than that in trough period.From 3D positioning accuracy perspective,GIM model is generally superior to Klobuchar model in SPP.