地基GPS水汽反演及水汽層析研究
[Abstract]:GPS meteorology has laid a theoretical foundation for GPS to detect atmospheric water vapor. Ground-based GPS atmospheric water vapor monitoring network and GPS continuous observation station provide excellent conditions for ground-based GPS water vapor inversion. Currently, meteorology is gradually moving from technical research to operational application. Therefore, the precision of ground-based GPS water vapor inversion is improved, meteorological application and three-dimensional tomography accuracy is improved. The main contents are as follows: 1. Based on the sounding data of Hong Kong from 2014 to October 2016, a weighted mean temperature model for Hong Kong region is established. The local model is used to calculate October. The weighted average temperature error is kept within 3.4 degrees, and the PWV error is kept within 1 mm. 2. When the terrain is fitted according to the coordinate information of GPS observatories, it is found that although the fitting error of the third model is small, the error of the unfitted stations is large, so the actual terrain situation should be considered in the process of terrain fitting. Through the study of PWV fitting, it is found that the quadratic model is the best for terrain fitting in Hong Kong, and the plane direction gradient factor does not improve the precision of PWV fitting significantly. The difference is controlled within 1 mm. In the time series analysis chart of PWV plane fitting based on the ground fitting, it is found that the plane PWV fitting can not only guarantee the precision, but also judge the water vapor trend and movement state obviously by this method. 4. In view of the problem of plane stratification in traditional tomography method, the difference between stations can not be considered. In this paper, a three-dimensional tomographic scheme based on terrain fitting is proposed, and the filtering times, the length of planar grid division and the terrain fitting model are considered respectively. The results show that the three-dimensional tomographic method based on terrain fitting can improve the water vapor density in the region below 3 km and above 6 km in the upper layer more precisely than the traditional tomographic method. But the accuracy in the middle layer of 3km-6km region is worse than that in the traditional plane tomography. Finally, a combination scheme is proposed to calculate the vapor density, and the results show that the method can effectively improve the accuracy of the results.
【學位授予單位】:西南交通大學
【學位級別】:碩士
【學位授予年份】:2017
【分類號】:P228.4;P407
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