互相关干扰中的宽带自适应波束形成

Broadband Adaptive Beamforming in Correlated Interferences

信号间的互相关干扰导致对期待信号的部分抵消。针对这种情况,提出了内插酉阵列最小均方无畸变响应(UIA-MVDR)宽带自适应波束形成技术以抑制这种干扰从而获取所需信号。UIA-MVDR不受贝塞尔函数展开阶数的限制,使得即使在中小规模阵列情形下,也能获得很精确的阵列流型逼近。相对于传统方法而言,UIA-MVDR能更好地消除互相关干扰。仿真实验表明它具有更佳的性能。

The problem of broadband adaptive beamforming is discussed in this paper aimed to avoid the signal cancellation caused by signal-correlated interferences. The proposed approach, referred to as unitalily interpolated array MVDR （UIA-MVDR）, is distinguished by imposing a unitary constraint on the transform matrix. It releases the restriction on the order of Bessel function expansion so that a very accurate array manifold approximation can be achieved even in the case of small or middle arrays. Compared with other related approaches, UIA-MVDR destroys the correlation more completely and achieves better performance. Its excellent performance is confirmed via a number of numerical examples.