Abstract:The troposphere delay is one of the most important sources of error in GNSS positioning. In this paper, the zenith tropospheric delay measured by water vapor radiometer (WVR) is used to evaluate the performance of four types of widely used troposphere models: Saastamoinen, GPT2, EGNOS and UNB3M, in Shanghai. Furthermore, the troposphere delays obtained from WVR and the four troposphere models are applied in GNSS precise point positioning (PPP). Data processes show that GPT2 shows the best performance in troposphere delay correction, as compared with the other three models; the mean ZHD bias of GPT2 is -0.11 cm with RMS of 0.75 cm; the mean ZWD bias is -2.34 cm with RMS of 7.67 cm. The position accuracy of PPP results from the ZHD and ZWD observed by WVR is improved by 16%, as compared with the conventional PPP model, in which the tropospheric parameter is estimated.
CHEN Meng,CHEN Junping,HU Congwei. Performance Evaluation of Troposphere Models and Application in GNSS Precise Point Positioning[J]. jgg, 2016, 36(3): 229-234.