摘要
定义了在天气雷达天线座水平度数值非0条件下的"实用坐标系",并提出该坐标系与"理想坐标系"之间的解析关系;在此基础上通过严格数学分析,得出天气雷达探测目标的方位、仰角在"实用坐标系"中的读数与其在"理想坐标系"中对应的方位、仰角数值之间的多元函数关系;定义了方位误差分析函数和仰角误差分析函数,并利用定义的误差分析函数对天气雷达天线座水平度影响目标定向进行了深入的解析分析。结果表明:仰角读数在45°以下,天线座水平度引起的方向定位误差不大于天线座水平度自身的数值;当仰角读数大于45°后,天线座水平度引起的方向定位误差迅速增大。尤其在接近天顶的空间区域,天线座水平度引起的方向定位误差可达天线座水平度数值本身的数百倍以上。
The Practical Coordinate System （PCS） had been originally defined under the condition which the value of the horizontality of the antenna pedestals was nonzero. The analytic relationship between the PCS and the Theo- retical Coordinate System （TCS） was also provided strictly. Base on the above relationship and the adoption of rigorous mathematical analysis, the multivariate functional relations of the azimuth-elevation numerical readings of the target which was detected by weather radar between the PCS and the TCS were presented. Additionally, the er- ror-analysis functions of azimuth and elevation were defined, and the analytical analysis on the problem of how the value of the horizontality of antenna pedestals of weather radar affected the target-orientation, had finally been made. The results indicate that the inaccuracy of the target-orientation caused by the horizontality of antenna pedes- tals of weather radar wouldn＇ t be greater than the value of the horizontality of antenna pedestals itself when the reading of the elevation is below 45 geometric degrees, while it increases rapidly when the value is above 45 geo- metric degrees. Particularly, within the vicinal space of the zenithal region, the values could exceed over hundreds of times compared with the value of the horizontality of antenna pedestals itself.
出处
《气象与环境学报》
2014年第2期93-100,共8页
Journal of Meteorology and Environment
基金
2011年辽宁省第一批科学技术计划项目"辽宁暖云人工增雨催化技术研究"(2011210001)资助
关键词
天气雷达
天线座水平度
实用坐标系
目标定向
解析分析
Weather radar
Horizontality of antenna pedestals
Practical coordinate system
Target-orientation
Ana-lytical analysis
