机载共形阵雷达杂波抑制方法研究

 共形阵机载相控阵雷达由于其特殊的几何配置导致杂波统计特性随距离的变化而变化,即杂波呈现严重的非均匀性,从而使得传统空时自适应处理(STAP)方法的性能严重下降.本文首先分析了共形阵机载相控阵雷达的杂波特性,通过对共形阵杂波多普勒频率的数学变换,从理论上说明了共形阵配置导致机载雷达杂波非均匀性的机理,并给出了一种衡量杂波非均匀性强弱的定量准则,然后提出了一种借助最小二乘(LS)参数估计修正传统SMI的共形阵机载相控阵雷达杂波抑制方法,最后针对几种典型共形阵列,通过仿真实验验证了本文方法的有效性.

Study on Clutter Suppression Method for Airborne Radar with Conformal Arrays

The radar clutter statistics for airborne conformal arrays varies by range,i.e.the clutter distributions are nonstationary,which causes performance degradation for the conventional space-time adaptive processing (STAP).After analyzing the clutter characteristic for conformal arrays,by mathematically transforming the clutter Doppler frequency,a criterion to quantificationally scale the clutter nonstationarity is presented,which illuminates the essential reason of the clutter nonstationarity for airborne radar with conformal arrays.And a clutter suppression method for airborne phased radar with conformal arrays is proposed,which takes a form of corrected sample matrix inversion (SMI) through the clutter covariance matrix (CCM) estimated by the least square (LS) estimation.Simulation results verify the effectivity of the presented method for the several typical conformal arrays.