区域GNSS高精度电离层建模研究与应用  

Research and application of regional GNSS high precision ionospheric delay model

作　　者：徐培云 XU Peiyun(China Railway Siyuan Survey and Design Group Co.,Ltd.,Wuhan 430063,China)

机构地区：[1]中铁第四勘察设计院集团有限公司,湖北武汉430063

出　　处：《甘肃科学学报》2024年第5期70-74,109,共6页Journal of Gansu Sciences

基　　金：中铁第四勘察设计院集团有限公司科研课题(2022K143)。

摘　　要：为了更精确地描述电离层变化,实现区域性实时电离层建模,基于区域连续运行参考系统(CORS),通过对比分析载波相位观测值直接计算的电离层延迟和相位平滑伪距计算的电离层延迟的精度,将精密单点定位(PPP)事后计算的电离层延迟当作真值,以穿刺点代替格网点,提出基于向量基(VIM)和GIMM的内插方式。将电离层产品和相位平滑伪距电离层产品进行约束PPP,并与传统无电离层组合进行比较分析,结果显示VIM的内插精度最高,在不同区域范围内的稳定性更强。与传统PPP进行对比,区域性实时电离层产品对收敛速度有很大提升,E方向的收敛速度提升了90%,相对相位平滑伪距电离层产品提高12%,在E定位精度上提高7%,有效改善了实时高精度电离层延迟模型,可用于提高精密单点定位PPP的收敛速度。In order to describe ionospheric changes more accurately and realize regional real-time ionospheric modeling,this paper is based on the continuously operating reference system(CORS).By comparing and analyzing the ionospheric delay calculated directly by carrier phase observation and the ionospheric delay calculated by phase smoothing pseudo-distance,the ionospheric delay calculated after PPP is taken as the true value,and the grid dot is replaced by the puncture point.Interpolation methods based on vector base interpolation model(VIM)and global ionosphere map model(GIMM)are proposed.The ionospheric products and phase-smoothed pseudo-distance ionospheric products were compared with the traditional ionosphere-free combination,and the interpolation accuracy of VIM was the highest,and the stability was stronger in different regions.Compared with traditional PPP,the convergence speed of regional real-time ionospheric products is greatly improved,the convergence speed in the E-direction is increased by 90%,the relative phase smooth pseudo-distance ionospheric products are increased by 12%,and the accuracy of E positioning is increased by 7%,which effectively improving the real-time high-precision ionospheric delay model.It can be used to improve the convergence speed of precise point positioning(PPP).

关 键 词：电离层延迟模型 载波相位平滑伪距 向量基内插模型 连续运行参考系统 精密单点定位 

分 类 号：P228.4[天文地球—大地测量学与测量工程]