一种宽带恒定束宽自适应波束形成算法

A Broadband Constant Beam Width Adaptive Beamforming Method

在宽带恒定束宽波束形成中,强干扰信号是导致波束性能下降的一个重要原因。为了抑制强干扰信号特别是快速运动中的强干扰信号,提出了一种宽带恒定束宽自适应波束形成算法。首先采用一种具有零陷控制特性的自适应波束形成技术形成参考波束图,然后利用二阶锥规划的方法计算出其它子带上与参考波束图既有相同主瓣响应又有相同零陷响应的自适应权向量,同时通过对白噪声增益的限制来保证算法的稳健性。不仅具有恒定束宽波束的特性,而且具有自适应波束零陷控制的特性,从而保证对强干扰信号有较强的抑制能力。仿真结果验证了该算法的有效性。

Strong interferers are important factors which lead to serious performance degradation in the broadband constant beam width beamforming.In this paper,a broadband constant beam width adaptive beamforming method is proposed for eliminating these interferers even fast-moving ones.At first,a null control adaptive beamforming method is used for a beam pattern of reference frequency.Then the adaptive weight vectors for their beam patterns of other subband,which have the same mainloble and nulls as the reference beam pattern,are calculated using Second-Order Cone programming.At the same time,the white-noise gain constraint is used for the robust of the method.This method has the two important characteristics ： constant beam width and adaptive null control.So it can have the stronge ability of eliminating fast-moving interferers.The validity is investigated through a series of simulations.