不等式约束宽带自适应恒定束宽波束形成算法  

An adaptive wideband constant beamwidth beamforming algorithm based on inequality constrain

作　　者：陈辉[1] 李冬海[1] 赵拥军[1] 刘成城[1] 

机构地区：[1]解放军信息工程大学,郑州450001

出　　处：《高技术通讯》2014年第4期394-400,共7页Chinese High Technology Letters

基　　金：863计划(2011AA7031015)资助项目

摘　　要：针对传统宽带自适应波束形成算法存在预延迟补偿误差时性能恶化的问题,提出一种基于不等式约束的宽带自适应恒定束宽波束形成算法。该算法首先对期望方向上不同频点阵列响应施加不等式约束,再通过空间响应变化(SRV)约束实现恒定束宽特性,将期望方向上的阵列响应约束简化为对某一参考频点的约束,实现无需预延迟补偿的宽带恒定束宽波束形成,最后将算法转化为二阶锥规划问题,并通过内点法求解得到其复数域权系数。仿真结果表明该算法无需预延迟补偿,具有良好的恒定束宽特性及较高的阵列输出性能,且可以自适应地抑制强干扰信号。To solve the performance degradation of traditional wideband beamformers when there exist pre-steering errors,an adaptive broadband constant beamwidth beamforming algorithm based on inequality constrain is proposed.The algorithm is described below.Inequality constrains are imposed at differentfrequencies and a preferable frequency invariance performance is obtained by imposing the spatial response variation （SRV） constrain.Then,the wideband constant beamwidth beamforming needing not pre-steering delay compensation is achieved by simplifying the constraints of look direction inte a constraint at a reference frequency.The proposed algorithm can be transformed into the resolution of the standard second order cone programming （SOCP）,and its complex weights can be obtained with the interior-point method.The simulation results illustrate that without using pre-steering delays,the proposed algorithm can suppress strong jamming adaptively,and achieve a preferable constant beamwidth performance and a high output signal to interference plus noise ratio（SINR）.

关 键 词：宽带自适应波束形成 预延迟误差 不等式约束 空间响应变化(SRV)约束 恒定束宽 

分 类 号：TN911.7[电子电信—通信与信息系统]