基于调零技术的相干干扰抑制方法

摘要

在干扰信号相干的情况下,一般波束形成方法不能准确地对相干信号和期望信号进行到达角(DOA)估计,干扰抑制效果较差.通过对相干信号和加权矢量二次型性能函数的分析,提出了一种相干干扰抑制方法,即基于多约束最小均方(multiple constrained least mean square,MC-LMS)算法的空域调零抗干扰技术.该方法利用MC-LMS算法迭代计算权值,并对阵列信号自适应加权输出,通过频谱分析可以得到抑制干扰的效果.计算机仿真和工程实现表明该方法在复杂的电磁环境下能对相干干扰进行抑制,并通过抗干扰的数量和抗干扰性能验证了该方法的有效性.%In the environment with coherent interferences,the common beamforming method has poor ability to suppress coherent interferences by estimating accurately the direction of arrival (DOA) of coherent signal and desired signal.This paper proposed the new anti-jamming technology based on multiple constrained least mean-square (MC-LMS) algorithm by the analysis of the coherent signal and the weighted vector two quadratic performance functions.The method used MC-LMS algorithms calculate the weights for weighting the output of array signals,so suppressed the coherent interferences by analyzing its spectrum.The algorithm has low computational complexity,high robustness and convergence.The results of simulation show that the coherent interference could be suppressed,the effectiveness of the proposed method are demonstrated with the complex electromagnetic environment.