摘要
目前使用的天气雷达方程不能用于雨区边界附近。为了研究数字雷达平均回波强度的分布、畸变和探测分辨率等规律的需要,本文发展出了可用于雨区边界的天气雷达方程。新建立的方程和已有的把波束限制在半功率点范围内,並假设半功率点范围内天线增益为常数的同类方程不同,它既考虑了半功率点以外的波束能量,也考虑了波束内天线增益的不均匀分布。本文以713天气雷达为例,从保证波束在降水区内时雷达方程能给出一定精度的回波强度和波束边缘进入降水区时能产生可探测回波这两个方面,利用新得到的方程,计算了有意义的波束范围,得到了一些在分析、使用雷达观测资料时值得注意的结果。
For the demands of studying the rules of returned echo distribution, distortion detective resolution and so on of a digitized radar, a weather radar equation suitable to the boundary region of precipitation field was developed.The new equation has been on the bases of considering unisotropically transmitted energy and for both of within and without the beamwidth between half-power points in contrast with the convention which was on an assumption of isotropically transmitted energy within half-power beamwidth only.
For model 713 weather radar as an example,the calculations of the effective limits of a radar beam have been done with the new equation considering a given detective accuracy when the radar beam is totally within a precipitation field or a detectable echo intensity when the radar beam is near a boundary region of precipitation. The results were useful for analysing and utilizing radar observation data.
出处
《高原气象》
CSCD
北大核心
1989年第3期261-272,共12页
Plateau Meteorology
关键词
雷达方程
波束范围
降雨遥测
Radar equation
Remote detection of precipitation
