基于SRTM数据的天气雷达探测环境分析研究

Research on Weather Radar Environment Detection Based on SRTM Elevation Data

利用SRTM高程数据作为选址基础数据,结合天气雷达工作方式和探测方法,计算得到天气雷达在0.5°、1.0°、2.4°仰角上地物遮挡情况;利用高程格点数据获得3个仰角的地物剖面数据,提高了SRTM数据利用精度和运算速度;分析中结合地球曲率和电磁波折射影响,改进算法获得站点遮蔽角图,站点上空1km、海拔3和6km等射束高度图及数据,该分析结果充分体现了SRTM数据的高分辨率特点。最后将结果数据与GIS地图结合,完成了四川省天气雷达网探测环境分析,并给出了各个台站评估结果。

The sites were selected based on SRTM elevation data to effectively extract the locations where the electromagnetic wave was obstructed by surface features when the weather radar was placed at 0.5°,1.0° and 2.4° in line with the working mode and detection principle of the weather radar.The obstructing conditions of surface features under the 3 elevations were obtained by means of elevation lattice data,so as to make SRTM data more precision and increase its arithmetic speed.The blind angle diagram of the sites,diagram of iso-beam heights and data at the elevations of 1 km,3 km and 6 km at the site were finally obtained.This method fully reflects the high resolution characteristics of SRTM data.Finally,by combining with GIS map,the analysis on environment detection by using weather radar network in Sichuan which was taken as an example was finished.The analysis results at each site were provided.