论文部分内容阅读
针对机载多输入多输出(MIMO)雷达杂波抑制问题,提出一种简化的杂波特征相消器(EC)。根据杂波在空时二维平面的先验分布离线构造杂波子空间,以此替代由协方差矩阵特征值分解(EVD)得到的杂波子空间,从而将最优权简化为一个确知投影矩阵与目标信号空时二维导向矢量的乘积,避免了传统EC方法中复杂的协方差矩阵估计和EVD运算,既消除了因协方差矩阵估计不准确而导致的性能损失又减小了运算量。仿真结果表明,在理想杂波模型条件下,简化MIMO-EC方法可获得接近最优的杂波抑制性能。
Aiming to the clutter suppression problem of airborne multiple input multiple output (MIMO) radar, a simplified clutter feature canceller (EC) is proposed. The clutter subspace is constructed off-line according to the prior distribution of clutter in space-time two-dimensional plane, so as to replace the clutter subspace obtained by EVD (EVD), so that the optimal weight is reduced to a known projection matrix And the space-time two-dimensional steering vector of the target signal, the traditional EC method avoids the complicated covariance matrix estimation and the EVD operation, which not only eliminates the performance loss and the computation complexity caused by the inaccurate estimation of the covariance matrix. Simulation results show that under the condition of ideal clutter model, the simplified MIMO-EC method can obtain near-optimal clutter suppression performance.