In order to describe ionospheric changes more accurately and realize regional real-time iono-spheric modeling,this paper is based on the continuously operating reference system(CORS).By compa-ring 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 ion-osphere-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 i-onospheric 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 i-onospheric delay model.It can be used to improve the convergence speed of precise point positioning(PPP).
维普
万方数据