CAJ | 학술논문

针对机载气象雷达在探测低空风切变时，有用信号会淹没在强杂波背景中的问题，该文提出一种基于空时自适应处理(STAP)的低空风切变风速估计方法。该方法首先利用空时插值原理校正机载前视阵地杂波的距离依赖性，获得多个独立同分布(IID)样本后估计地杂波协方差矩阵，然后构造适用于分布式低空风切变目标的空时自适应处理器，在自适应抑制地杂波的同时积累低空风切变信号，最终实现风场速度的精确估计。仿真结果表明，在高杂噪比、低信噪比的情况下，该方法可有效地自适应抑制地杂波并精确地估计风场速度。
침대궤재기상뢰체재탐측저공풍절변시，유용신호회엄몰재강잡파배경중적문제，해문제출일충기우공시자괄응처리(STAP)적저공풍절변풍속고계방법。해방법수선이용공시삽치원리교정궤재전시진지잡파적거리의뢰성，획득다개독립동분포(IID)양본후고계지잡파협방차구진，연후구조괄용우분포식저공풍절변목표적공시자괄응처리기，재자괄응억제지잡파적동시적루저공풍절변신호，최종실현풍장속도적정학고계。방진결과표명，재고잡조비、저신조비적정황하，해방법가유효지자괄응억제지잡파병정학지고계풍장속도。
When detecting low-attitude windshear with airborne weather radar, the real signals are usually covered with strong clutter. In this paper, a novel method of low-attitude windshear speed estimation based on Space-Time Adaptive Processing (STAP) is proposed to solve the above problem. The proposed method handles the range-dependence of clutter of airborne forward looking array with space-time interpretation theory to achieve the Independent and Identically Distributed (IID) samples used in the clutter covariance matrix estimation; then the space-time adaptive processor is constructed which is applicable to a distributed low-attitude windshear target to suppress clutter and accumulate windshear signal; finally the accurate estimation of wind speed is got. The experimental results show that the proposed method can achieve a superior clutter suppression performance and an accurate wind speed estimation in high clutter-to-noise ratio and low signal-to-noise ratio.