Research Regional Water Vapor Based On Continuously Operating Reference Stations

Water vapor in the Earth’s atmosphere is an important part, although the proportion of the share in the whole atmosphere just only0.1%to3%, but it is the most active atmospheric components and changes its spatial and temporal distribution is quite complex. Many of the earth’s weather and natural disasters in atmospheric water vapor content has a close relationship. Conventional means of atmospheric water vapor detection influenced by space and time resolution or detection precision, limit the high space-time resolution, high precision of water vapor information retrieval. Therefore, effective for high precision, high spatial and temporal resolution of atmospheric water vapor information for accurate analysis of small and medium scale formation and evolution of the bad weather, and in a timely manner to the weather forecast and disaster prevention and mitigation has an important guiding role. This paper revolves around the various aspects content study:1. Introduced the GPS water vapor inversion method and theoretical basis, the atmospheric water vapor for subsequent tomography Hong Kong areas to provide the theoretical basis.2. In this paper, based on the observation collected data from the Hong Kong CORS station as the research foundation, Uses the BERNESE software calculating zenith wet delay of each station, then inversion of each station to atmospheric precipitation PWV, this Kings Parks radiosonde station and the nearest HKSC station are compared and analyzed.Analyzing the error of GPS inversion zenith wet delay is studied, on the basis of the BERNESE software and analyzed by experiments using different ephemeris and ocean models zenith wet delay correction for impact analysis.3. For in the tomography equations to calculate, using the traditional method of least squares in the lack of a sparse matrix inversion, this paper we study the iterative reconstruction algorithm in the application of tomography solution, while modify MART algorithm and applied to the calculation of tomography equations. Research results show that:the modified MART algorithm can be used in tomography equations of calculating.4. To study the effect of vertical resolution on the tomography results, the design of the vertical resolution of425m and850m on the Hong Kong region tomography. The results show that:425m vertical resolution on improving the distribution of water vapor is more reasonable.5. To study the effects of vertical priori information on the tomographic results. Designed two two kinds of solutions,1: choose the mean time five days before tomography as vertical sounding data prior information; Option Two:Using tomography moment last last vertical sounding data as a priori information. The results show that:the choice of programs one pair of atmospheric water vapor distribution has certain improvement.6. According to the Hong Kong Satellite Positioning Reference Station Network can receive GPS and GLONASS satellite signals simultaneously, the proposed use GLONASS integration of GPS satellite signal was applied to the atmospheric water vapor tomography studied using satellite signals to improve the integration of atmospheric water vapor tomography results.The results show that compared with single GPS, the fusion of satellite signals through tomography area, the number of grid was improved, but in the aspect of water vapor tomographic results to improve the effect is not obvious.