机载柱形共形阵低空风切变风速估计方法

Wind Speed Estimation of Low-Altitude Windshear Under Airborne Columnar Conformal Array

针对机载柱形共形阵气象雷达在探测低空风切变时,有用信号会受到强地杂波影响的问题,提出了一种机载柱形共形阵体制下的低空风切变风速估计方法。该方法首先从柱形共形阵特殊阵列流型引起杂波抑制困难的本质原因出发,利用空域角频率补偿法对各个距离单元的回波数据进行补偿,获得多个独立同分布(Independent and Identically Distributed,IID)的样本后估计杂波协方差矩阵,然后构造适用于低空风切变目标的空时自适应(Space-Time Adaptive Processing,STAP)处理器,在自适应抑制地杂波的同时积累风切变信号,最终实现风场速度的精确估计。仿真结果表明,该方法可有效实现地杂波的抑制并精确地估计风速。

When detecting low-attitude windshear with airborne columnar conformal array weather radar,the real signals are usually covered with strong clutter.In this paper,a method of low-altitude windshear wind speed estimation under the airborne columnar conformal array system is proposed.This method first starts from the essential reason for the difficulty of clutter suppression caused by the special array flow pattern of the columnar conformal array,and uses the spatial angular frequency compensation method to compensate the echo data of each distance unit to achieve the independent and identically distributed(IID)samples used in the clutter covariance matrix estimation.Then,the space-time adaptive processor for low-altitude windshear targets is constructed to accumulate windshear signal and suppress clutter.Finally,the accurate estimation of the wind speed is achieved.The experimental results show that the method can effectively suppress the clutter and accurately estimate the wind speed.