一种抑制严重非均匀杂波的机载MIMO-STAP方法  

An Airborne MIMO-STAP Method for Severely Non-Homogeneous Clutter Suppression

作　　者：李彩彩[1] 廖桂生[1] 朱圣棋[1] 吴孙勇[1] 

机构地区：[1]西安电子科技大学雷达信号处理重点实验室,陕西西安710071

出　　处：《电子学报》2011年第3期511-517,共7页Acta Electronica Sinica

基　　金：国家自然科学基金重点项目(No.60736009);国家杰出青年科学基金(No.60825104)

摘　　要：在机载MIMO雷达体制下,针对严重非均匀环境(包括斜视阵和前视阵近程段),提出了一种新的基于时域平滑的两级级联降维STAP方法,先后对杂波和孤立干扰进行抑制.第一级对少量独立同分布(IID)辅助样本进行平滑,用得到的所有样本估计杂波特性并用先时后空自适应级联处理器(称为mDT-SAP)中的3DT-SAP(简称3DT)方法进行抑制,第二级用待检测距离单元数据进行平滑估计孤立干扰特性并用3DT方法进行抑制.该方法克服了直接数据域(DDD)方法空时孔径损失大,误差鲁棒性差及没有充分利用统计信息的缺点,具有良好的性能.计算机仿真实验验证了其有效性和优越性.A two stage hybrid reduced rank STAP method is proposed for severely non-homogeneous environment in MIMO radar.It firstly suppresses the clutter and then rejects isolated interferers.In the first stage,forward/backward temporal smoothing technique is applied to the limited secondary samples to gain more samples from which clutter covariance matrix is estimated.And then 3DT or 3CAP method is used for clutter suppressing.In the second stage,upon applying forward/backward temporal smoothing technique to the sample obtained from the range gate of interest,the covariance matrix of isolated interferers can be estimated.Subsequently 3DT method is also made use of to reject isolated interferers.The presented method possesses small spatial temporal aperture loss,well robustness to errors and makes good use of statistical information.Computer simulations verify its validity and robustness.

关 键 词：STAP(Space-Time Adaptive Processing) MIMO(Multiple INPUT MULTIPLE Output)雷达 非均匀杂波 

分 类 号：TN958[电子电信—信号与信息处理]