The Research and Analysis of the Tropospheric Delay Correction Models in Precise Point Positioning

In Precise Point Positioning,the key problem is to reduce the influence of errors for positioning accuracy through the effectual methods.Saastamoinen and Niell are nice to reduce the tropospheric delay.The paper mainly focuses on the introduction of this two kinds of models,and analyses their correction effect of tropospheric delay in PPP through the positioning results.Positioning results are given in the form of the STD and RMS,it shows that Saastamoinen and Niell both can improve the positioning results,but the effect of Niell is much better.