相控阵天气雷达气象雷达方程修正研究

A Study on Weather Radar Equation Correction for Phased Array Weather Radar

气象雷达方程是天气雷达进行定量测量的基础,由于相控阵天气雷达特有的扫描特性,应对业务中应用的气象雷达方程进行修正。从天线方向图函数不同的角度出发,对雷达方程进行推导修正,并模拟相控阵天气雷达在窄发窄收、宽发四收两种不同探测模式下扫描带有降雹的气旋,得到回波强度图和速度图。在统计模拟扫描计算值与给定值误差基础上,定量分析天线方向图函数对修正后雷达方程计算的影响,得出在窄发窄收探测模式下计算误差值在测量精度范围内,经过修正的雷达方程在业务中应用是可行的。

Weather radar equation is the base of quantitative measurements, due to the unique scanning characteristics of phased array radar, it is necessary to make a correction with radar equation in business running. In order to correct weather radar equa- tion, the radar equation from the perspective of different antenna pattern function is deduced, a simulation of phased array radar is made scan a cyclone accompanied with strong hail in different detection mode and thus obtain the radar echo intensity diagram and velocity diagram. On the basis of the statistics of simulation scanning errors between the calculated value and the given value, the impact of the antenna pattern function on the calculation of revised radar equation is analyzed. The result shows that calculation er- rors could satisfy the requirement of measurement accuracy in the narrow transmitting beam and narrow receiving beam detection mode, and suggests that the revised radar equation is feasible in the application.