机载圆柱形共形阵雷达杂波抑制方法

A Clutter Suppression Method for Airborne Radar with Cylindrical Conformal Array

针对机载圆柱形共形阵雷达非均匀杂波抑制问题,首先建立了圆柱形共形阵雷达的空时二维杂波模型,分析了共形阵雷达所面临的非均匀杂波环境的特性。然后提出了一种基于最小二乘(Least Square,LS)估计的修正的SMI杂波抑制方法,该方法通过最小二乘方法估计得到杂波协方差矩阵,并以此修正常规SMI算法。仿真表明:与平面阵相比圆柱形共形阵的非均匀引起了杂波自由度的大幅增加,较传统算法具有较强的非均匀杂波抑制能力,且运算量不随系统维数的增加而上升。

This paper focuses on the problem of the suppression of nonhomogeneous clutter of airborne radar with cylindrical conformal array.First,the clutter model of airborne radar with cylindrical conformal array is presented,and the characteristics of nonhomogeneous clutter are analyzed based on the model.Then,a clutter suppression method of correctional Sample Matrix Inversion（SMI） based on the Least Square（LS） is presented.The Clutter Covariance Matrix（CCM） is estimated via LS,and the SMI algorithm is corrected by the CCM.The simulation result indicated that： 1） compared with the panel phased array,the degrees of freedom of clutter in cylindrical conformal array are increased greatly;and 2） the proposed algorithm is more effective in suppression of nonhomogeneous clutter than the traditional STAP algorithms,and the computation load will not improve with the increasing of dimension the system.