The New PWV Conversion Models Based on GNSS and Meteorological Elements in the China Region

To address the problems of cumbersome processes, large data, and error accumulation in calculation conventional GNSS precipitable water volume (PWV), multi-factor PWV conversion models were established using multiple linear regression fitting method. This paper analyzed correlation between zenith tropospheric delay (ZTD), surface temperature (T), atmospheric pressure (P) based on data from 38 stations China region 2017 to 2018. The research results showed that mean deviation one-factor model GNSS-ZTD was 12.16 mm, its RMS 14.30 mm. After adding as an independent variable form two-factor model, decreased 9.07 mm 11.15 0.31 0.39 three-factor temperature, pressure, 0.33 0.38 accuracies similar. external precision assessment verified by 12 unused for modelling establishment. two both less than 0.16 which proves their widespread applicability region.