一种低复杂度的稳健宽带SDL波束形成算法  

Low Complexity Robust Wideband Beamforming Algorithm for Sensor Delay Lines

作　　者：汪婉秋[1] 刘成城[1] 赵拥军[1] 陈晖[1] 

机构地区：[1]信息工程大学导航与空天目标工程学院,河南郑州450052

出　　处：《信息工程大学学报》2013年第1期72-77,共6页Journal of Information Engineering University

基　　金：国家863计划资助项目(2011AA7031015)

摘　　要：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。Look direction errors can improve robustness of the wideband severely degrade performance of beamformer against look direction the wideband beamformer. To error, a novel robust wideband beamforming algorithm with sensor delay lines （SDL） is proposed by employing the spatial response variation （SRV） 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 af- ter being reformed to the form of standard second order cone programming （SOCP）. Simulations il- lustrate the effectiveness of the proposed algorithm.

关 键 词：阵元延迟线 稳健宽带波束形成 空间响应变化 恒定束宽波束形成器 

分 类 号：TN911.7[电子电信—通信与信息系统]