零陷加深的自适应波束形成技术研究

Research on Augment of Null Depth for Adaptive Beamformer

在干扰方向和功率稳定的情况下,传统的自适应数字波束形成器能有效抑制干扰、提高信干噪比,但在干扰功率起伏的环境下,自适应数字波束形成器不能持续可靠地抑制干扰。针对这一问题,给出了一种增强信号中的干扰分量,再进行自适应波束形成的处理方法。该方法能根据需要对自适应数字波束形成器的自适应零点的零深进行调整,提高系统的抗干扰性能。理论分析和仿真实验验证了该方法的可行性。

Conventional adaptive beamformers can suppress interferences and improve SINR effectively if the direction and power of interferences are stable.But,in the directions of interferences,the null depth of adaptive beamformer＇s pattern is in relation to the power of interferences.In the environment with fluctuant interference,Conventional adaptive beamformers cannot reliably suppress interferences continually.A method presented by which the interferences in the sampled data are augmented for lowering the null level.With the method,the depth of null can be changed flexibly.The validity of the method is verified by theory analysis and simulation,and the characteristic of null direction and convergence are analyzed.