A Method to Improve the Utilization Rate of Satellite Rays for Three-dimensional Water Vapor Tomography Using the ECMWF Data

• Main Authors: ZHAO Qingzhi, YAO Yibin, YAO Wanqiang, CHEN Peng, WU Manyi
• Format: Article
• Language: zho
• Published: Surveying and Mapping Press 2018-09-01
• Series: Acta Geodaetica et Cartographica Sinica
• Subjects: GNSS; water vapor tomography; radiosonde; ECMWF
• Online Access: http://html.rhhz.net/CHXB/html/2018-9-1179.htm

In order to overcome the disadvantage of traditional tomography method which only uses the signals passing from the top boundary of research area for reconstructing of three-dimensional water vapor information,a novel method is proposed which improve the utilization rate of signals used based on the European Centre for Medium-range Weather Forecasts (ECMWF) data.By introducing the scale factor,the slant water vapor content which derived from the signals penetrated from the side face of research area is obtained and participating the establishment of observation equation.The observed GPS observation from the satellite positioning reference station network (SatRef) and the corresponding meteorological data are selected to validate the feasibility and accuracy of the proposed method by combing the radiosonde data of 45004 and the grid point data from ECMWF.Experimental result shows that the utilization rate of rays used and the coverage rate of voxels crossed by rays are increased by 55.16% and 16.46%,respectively.The root mean square error,mean absolute error and relative error calculated from the proposed method are superior to that of traditional method,when the radiosonde data and ECMWF data are regarded as the references.