江苏省区域电离层模型的建立和精度分析

Development and Accuracy Analysis of Regional Ionospheric Model in Jiangsu Province

利用江苏省连续运行卫星定位参考站综合服务系统的双频GPS载波相位观测数据,分别采用曲面拟合法、神经网络方法建立区域电离层模型,并详细分析不同模型的精度。计算结果表明,当基准站间距为200~300 km时,曲面拟合模型的平均外符合精度为0.21 m,神经网络电离层模型的平均外符合精度为0.06 m;基于神经网络电离层模型的单频GPS精密单点定位4 h静态时段解可以达到cm级精度。

Regional ionospheric models of JSCORS using polynomial and neural network are develped in this paper,and the accuracy of the models is analyzed in detail.The numerical result shows that the external accordant accuracy of the regional ionospheric delay model using polynomial and neural network is better than 0.21 and 0.06 meters,respectively,when the distances of base stations are between 200 and 300 km.The accuracy of single precise point positioning with four hour static single frequency observation can reach centimeter level based on neural network ionospheric model.