陕西省北斗三号区域电离层TEC建模与精度评估

Modeling and accuracy assessment of regional ionospheric TEC over Shaanxi province based on BDS-3

基于陕西省北斗地基增强监测站数据,利用4阶球谐函数建立了陕西区域电离层总电子含量(TEC)模型,生成区域TEC格网产品.实验结果表明:以欧洲定轨中心(CODE)全球电离层图(GIM)产品作为参考,利用BDS-3数据获得的陕西区域北斗电离层产品精度为2.54 TECu,与CODE产品标称精度相当.在单频精密单点定位(SF-PPP)性能方面,BDS-3区域电离层产品可以提升定位精度35%,优于CODE全球电离层产品改正效果(27%).综合而言,BDS-3单系统在区域电离层建模方面具备较为优异的性能水平.

Based on data from BeiDou ground-based augmentation monitoring station in Shaanxi province,a Shaanxi regional ionospheric total electron content(TEC)model is established using the fourth-order spherical harmonic function to generate regional TEC grid products.The experimental results show that the accuracy of the Shaanxi regional ionospheric products obtained from BDS-3 data is 2.54 TECu,which is comparable to the nominal accuracy of the Global Ionospheric Map(GIM)product of the Center for Orbit Determination(CODE).In terms of single frequency precise point positioning(SF-PPP)performance,the BDS-3 regional ionospheric product improves the positioning accuracy by 35%,which is better than the correction performance of the CODE global ionospheric product(27%).Overall,the BDS-3 single system has superior performance in regional ionospheric modeling.