一种低复杂度的稳健宽带SDL波束形成算法

针对存在期望信号指向误差时宽带波束形成性能下降等问题,提出一种基于最差性能准则和空间响应变化(SRV)的稳健阵元延迟线(SDL)宽带波束形成算法。该算法首先建立SDL宽带阵列模型;然后基于最差性能准则,设置多个约束条件,并通过对阵列波束波动附加离散SRV约束,用一参考频率上的约束条件代替一组不同频率上的约束条件;最后将稳健宽带波束形成问题转化为二阶锥规划问题,利用内点法有效求解。仿真实验表明,存在期望信号指向误差的情况下,该算法具有较好的稳健性,恒定束宽性能良好,且计算复杂度较低。

Low Complexity Robust Wideband Beamforming Algorithm for Sensor Delay Lines

Look direction errors can severely degrade performance of the wideband beamformer. To improve robustness of the wideband beamformer against look direction error, a novel robust wideband beamforming algorithm with sensor delay lines is proposed by employing the spatial response variation constraints and worse case performance optimization method. Based on the SDL wideband model, the SRV element is constrained to the fluctuation of array spatial responses within the desired frequency band, after that a group of worse case performance constraints imposed on the sampled frequency points can be replaced by one single constraint at a reference sampled frequency point. This wideband beamforming optimization formula can be solved with interior point method after being reformed to the form of standard second order cone programming . Simulations illustrate the effectiveness of the proposed algorithm.