自适应数字波束空域相干干扰抑制方法

在干扰相干背景下,接收信号协方差矩阵中信号空间的一些向量收敛到噪声空间中,仅利用二阶信息不能准确地得到干扰的方向信息,因而干扰抑制效果较差。为此,提出了一种自适应数字波束空域相干扰抑制方法。该方法是首先基于高阶累积量估计出广义方向矢量,然后根据最优均方逼近原则,结合切比雪夫加权系数形成波束,来抑制相干干扰。仿真结果表明,所提方法能够有效地抑制相干干扰。

Interference suppression based on coherent interference by adaptive digital beam forming

In the coherent interference environment, the jammer's information can not be completely obtained only by the second order covariance information because the vector of signal subspace will converge into noise subspace, and it is difficult to get a good result of interference suppression. A new technique is presented for synthesizing an antenna array pattern based on high-order cumulants. In order to suppress the interference in case of coherent interference, the generalized steer vectors are estimated firstly, then the array pattern synthesis problem is formulated as a least-square null constrained optimization problem. Some simulation results show that coherent interference can be rejected effectively by the presented method.