基于SHF的全球电离层模型建立

Establishment of SHF-based Global Ionosphere Model

为研究全球电离层的时空变化特征以及建模精度,实验基于球谐函数模型,采用全球CORS网2019年第305天-第334天的GPS双频观测数据,建立全球电离层模型。并对GPS卫星的DCB进行可靠性、稳定性分析,对欧洲区域电离层的VTEC进行精度分析与评价。实验结果表明:GPS卫星的DCB与欧洲定轨中心(CODE)偏差在所选时段RMS值保持在0.25ns以内。第305天-第334天的电离层计算结果与CODE的VTEC差值的RMS保持2.52TECU以内。

In order to study the spatio-temporal variation characteristics and modeling accuracy of the global ionosphere,based on the spherical harmonic model,the global ionospheric model is established by using the GPS dual-frequency observation data of the global CORS network from 305th to 334th days in 2019.The reliability and stability of the DCB of the GPS satellite are analyzed,and the accuracy of the ionospheric VTEC in the European region is analyzed and evaluated.The test results show that the deviation between the DCB of GPS satellite and the Centre for Orbit Determination in Europe(CODE)is within 0.25ns in the selected period.The RMS of the difference between the ionospheric calculation and the VTEC of CODE on the 305-334th days is kept within 2.52TECU.