高阶电离层对低纬度区域CORS网的影响

Impact of higher-order ionospheric delay on the CORS network in the low-latitude regions

为了评估高阶电离层对低纬度区域连续运行参考站(CORS)网的影响,该文利用GAMIT/GLOBK处理深圳市北斗连续运行卫星定位服务系统(SZBDCORS)2017—2020年的观测数据,分析了高阶电离层对该区域参考站坐标的影响规律。实验结果表明:通过施加高阶电离层改正,北方向、东方向和高程方向加权均方根值改善幅度依次为20.6%、22.5%、26.8%;在空间尺度上,高阶电离层对SZBDCORS各测站影响呈现为向南偏移,其平均偏移量可达4.75 mm;从时间尺度上看,夏季受到的影响最大,冬季受到的影响最小。因此,低纬度区域CORS网的数据处理必须考虑高阶电离层改正。

To assess the impact of higher-order ionospheric delay on CORS network in the low-latitude regions,in this discussion,the continuous data of Shenzhen Beidou continuously operating reference stations(SZBDCORS)during 2017-2020 were processed with GAMIT/GLOBK,and analyses were conducted by using the coordinate time series of reference stations.The results indicated that the weighted root mean square value tended to decrease after the higher-order ionospheric delay correction was performed,and the WRMS for the east,north and up coordinate component was improved by 20.6%,22.5%and 26.8%,respectively.Furthermore,on spatial scale,the higher-order ionospheric delayed triggers a southward displacement on SZBDCORS,and the mean displacement for the north coordinate component was 4.75 mm.On time scale,the higher-order ionospheric delay had maximum influence in summer and minimum influence in winter.As a consequence,higher-order ionospheric correction was critical for the data processing of CORS network in the low-latitude regions.