基于空时采样矩阵的机载MIMO雷达杂波抑制方法  

Clutter Suppression for Airborne MIMO Radar Based on Space Time Sampling Matrix

作　　者：熊元燚 谢文冲[2] 王永良[1,2] 高勋章[1] XIONG Yuanyi;XIE Wenchong;WANG Yongliang;GAO Xunzhang(College of Electronic Science and Technology,National University of Defense Technology,Changsha,Hunan 410073,China;Department of Early Warning Technology,Air Force Early Warning Academy,Wuhan,Hubei 430019,China)

机构地区：[1]国防科技大学电子科学学院,湖南长沙410073 [2]空军预警学院预警技术系,湖北武汉430019

出　　处：《信号处理》2023年第5期774-785,共12页Journal of Signal Processing

基　　金：国防科技卓越青年科学基金项目(2019-JCJQ-ZQ-006)资助课题。

摘　　要：相对于传统机载相控阵雷达单输入多输出(SIMO)体制,多输入多输出(MIMO)机载雷达中的空时自适应处理(STAP)技术可以获得杂波抑制和动目标检测性能的大幅提升。但是传统机载MIMO雷达空时自适应处理所需要的计算量和样本需求量巨大,无法满足非均匀杂波环境和实时性要求。为了解决这一问题,本文提出了一种机载MIMO雷达空时自适应杂波抑制方法(clutter suppression based on space time sampling matrix,CSBSM)。该方法利用了杂波协方差矩阵的低秩特性,基于空时采样矩阵构造杂波协方差矩阵,并通过空时滑窗处理对杂波功率进行估计,在非均匀杂波环境下CSBSM方法仅需要单个样本即可实现对杂波的有效抑制。同时,由于空时采样矩阵和独立采样点位置可离线计算,因此CSBSM方法的运算量较小,适用于极端非均匀杂波环境。计算机仿真结果验证了所提方法的有效性。Compared with the traditional airborne phased array radar single input multiple output system,the space time adaptive processing(MIMO-STAP)technology in the multiple input multiple output radar can greatly improve the performance of clutter suppression and moving target detection.However,traditional MIMO-STAP requires a large amount of computation and training samples,which cannot meet the requirements of non-homogeneous clutter environment and realtime processing.In order to solve this problem,this paper proposes a space-time adaptive clutter suppression method for airborne MIMO radar,namely CSBSM method.This method makes use of the low rank property of the clutter covariance matrix,constructs the clutter covariance matrix based on the space-time sampling matrix,and estimates the clutter power through subaperture smoothing.In the non-uniform clutter environment,CSBSM only needs a single sample to effectively suppress clutter.At the same time,since the space-time sampling matrix and the position of independent sampling points can be calculated offline,the CSBSM method requires less computation and is suitable for extremely non-uniform clutter environments.Computer simulation results verify the effectiveness of the proposed method.

关 键 词：机载MIMO雷达 空时采样矩阵 杂波抑制 运算量 

分 类 号：TN957[电子电信—信号与信息处理]