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.