一种机载非正侧视阵雷达近程杂波对消方法  

Short-range clutter elimination method for non-side looking airborne radar

作　　者：文珺[1] 史林[1] 廖桂生[1] 

机构地区：[1]西安电子科技大学电子工程学院,陕西西安710071

出　　处：《系统工程与电子技术》2013年第10期2069-2073,共5页Systems Engineering and Electronics

基　　金：国家重点基础研究发展计划(973计划)(2010CB731903);中央高校基本科研业务费专项资金(K5051202035)资助课题

摘　　要：机载预警雷达发射中高脉冲重复频率信号时,会导致接收杂波存在距离模糊现象。对于机载非正侧视阵雷达(non-side looking airborne radar,non-SLAR),其近程回波具有强烈的距离依赖性,导致通过统计方法估计的杂波协方差矩阵不准确,使得空时自适应处理(space-time adaptive processing,STAP)的杂波抑制性能急剧下降。接收天线为均匀线阵条件下,由于阵列没有俯仰维自由度,无法直接对近程杂波进行抑制。针对这种情况,提出了一种近程杂波对消方法,该方法首先估计出近程模糊距离门对应的俯仰角,然后利用空时二维杂波谱的先验信息对近程的杂波进行估计,最后对原始的接收数据进行近程杂波对消。该方法能够对近程杂波进行有效抑制,获得的杂波抑制性能高于直接处理法。仿真实验结果验证了该方法的有效性。The short-range clutter presents severe range dependence for non-side looking airborne radar （non-SLAR）. Due to the absence of elevation degree of freedom, the uniform linear array cannot directly sup press the short-range clutter with range ambiguity. As a result, the clutter plus noise covariance matrix cannot be estimated accurately which greatly declines the clutter suppression performance by space-time adaptive pro- cessing （STAP）. To overcome this problem, a short-range clutter elimination method is proposed. Firstly, the elevation angle of the short range i evaluated. Then the short-range clutter is reconstructed by the information of the clutter spectrum, and the short-range clutter to all received channels by adaptive processing is eliminated. Finally, reduced demensional space-time adaptive processing （RD-STAP） technique is adopted to suppress the residual clutter. The proposed method can eliminate the short-range clutter effectively. Simulation results dem-nstrate the validity of the method.

关 键 词：机载非正侧视阵雷达 距离模糊 杂波距离依赖性 空时自适应处理 杂波抑制 

分 类 号：TN957.52[电子电信—信号与信息处理]