Ground-Based GPS In Water Vapor Observation Data Processing And Analysis

Meteorology moisture observation based Global Positioning System satellite signal is applied longitudinally through the Earth’s atmosphere then reach the ground when the amount of delay caused by the receiver to invert the cumulative amount of the receiver area zenith atmosphere of water vapor. It has built a foundation of more than 1,000 stations nationwide GPS / MET observation network atmospheric water vapor, and supporting the data processing platform. Data processing core software uses solver GAMIT inversion software. In the actual operation of the business process,control files found stations to coordinate precision solver accuracy greatly influence the results, to improve the increase coordinate station is to improve the system solver accuracy effective technical means. This article is based on the national meteorological center of global satellite positioning vapor observation data processing platform of national construction projects, Kalman filtering, applying a median filter,an arithmetic mean filtering, limiting filtering performed in the coordinate update Discussion, improve the accuracy of a priori coordinate stations, thereby improving the accuracy of the inversion results. Through calculation and test, water vapor inversion accuracy has been greatly improved, gradually to meet the business requirements of the system.