| 利用ECMWF改善射线利用率的三维水汽层析算法 |
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| 引用本文： | 赵庆志,姚宜斌,姚顽强,陈鹏,吴满意.利用ECMWF改善射线利用率的三维水汽层析算法[J].测绘学报,2018,47(9):1179-1187. |
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| 作者姓名： | 赵庆志 姚宜斌 姚顽强 陈鹏 吴满意 |
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| 作者单位： | 1. 西安科技大学测绘科学与技术学院, 陕西 西安 710054;2. 武汉大学测绘学院, 湖北 武汉 430079;3. 国家测绘地理信息局第一地形测量队, 陕西 西安 710054 |
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| 基金项目： | 西安科技大学优秀青年科技基金（2018YQ3-12）；西安科技大学博士启动金项目（2017QDJ041） |
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| 摘 要： | 针对传统水汽层析技术只能利用完整穿过研究区域射线重构三维水汽的缺陷，提出了一种利用欧洲中尺度天气预报中心格网产品改善三维水汽反演射线利用率的方法。该方法通过引入比例因子，计算出侧面穿出射线在层析区域内的水汽含量，并参与观测方程的建立。利用香港卫星定位参考站网的实测全球定位系统和气象数据，结合该区域的无线电探空站45004和ECMWF格网点数据，对该方法的可行性及精度进行验证。试验结果表明：相对于传统方法，该方法的射线利用率和网格覆盖率分别提高了55.16%和16.46%；分别以探空数据和ECMWF格网数据为参考基准，发现提出的方法其均方根误差、平均绝对偏差和相对误差等均优于传统方法。
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| 关 键 词： | GNSS 水汽层析 无线电探空 ECMWF |
| 收稿时间： | 2017-07-20 |
| 修稿时间： | 2018-05-03 |
A Method to Improve the Utilization Rate of Satellite Rays for Three-dimensional Water Vapor Tomography Using the ECMWF Data |
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| ZHAO Qingzhi,YAO Yibin,YAO Wanqiang,CHEN Peng,WU Manyi.A Method to Improve the Utilization Rate of Satellite Rays for Three-dimensional Water Vapor Tomography Using the ECMWF Data[J].Acta Geodaetica et Cartographica Sinica,2018,47(9):1179-1187. |
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| Authors: | ZHAO Qingzhi YAO Yibin YAO Wanqiang CHEN Peng WU Manyi |
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| Institution: | 1. College of Geomatics, Xi'an University of Science and Technology, Xi'an 710054, China;2. School of Geodesy and Geomatics, Wuhan University, Wuhan 430079, China;3. The First Topographic Surveying Brigade of National Administration of Surveying, Mapping and Geoinformation of China, Xi'an 710054, China |
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| Abstract: | 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. |
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