联合单站地基GNSS和空基掩星近实时反演电离层电子密度

Near Real-Time Inversion of Ionospheric Electron Density by Combining with Singular Ground-Based GNSS Receiver and Space-Based Occultation

采用非组合精密单点定位技术估算VTEC,并选取一系列与测站共址的COSMIC掩星电离层产品共同作为约束条件,利用函数模型近实时地探测GNSS测站上空电离层电子密度剖面特性。为了验证新方法的可行性,选取东亚11个IGS跟踪站2016年4个季节中3月、6月、9月和12月最后一周的观测数据及与测站共址的COSMIC掩星ionPrf产品进行实验。将每一个反演结果与同一时刻COSMIC掩星探测的电离层电子密度(作为真值)进行比较。结果表明,新方法实时反演的电子密度剖面与掩星电离层产品相比具有很好的一致性,所获得的f_0F_2与h_mF_2参数精度皆优于IRI2016模型。

The vertical total electron content(VTEC)is obtained using uncombined precise point positioning technique,while a series of COSMIC ionospheric occultation products which are near GNSS stations are collected.Both are used as common constraint conditions to retrieve electron density profile above these stations using functional model in near real-time.To verify the feasibility of this new method,GNSS observation data from the last weeks of March,June,September,and December in 2016 at 11 IGS stations in east Asia,as well as corresponding COSMIC ionospheric products(ionprf)occurring in or near these stations are collected.The results are compared with COSMIC occultation electron density profile products,which are seen as true values.The preliminary statistical results show a good consistency between the retrieved electron density profile using the ground-based singular GNSS station and space-based occultation products.The precision of f 0F 2 and h mF 2 parameters are both better than those of IRI2016.