聚焦波束形成的一阶零点约束权  

One order null constrained weight of focused beamforming

作　　者：周伟 梅继丹 惠俊英 孔琦 

机构地区：[1]哈尔滨工程大学水声技术国防重点实验室,黑龙江哈尔滨150001

出　　处：《华中科技大学学报（自然科学版）》2010年第5期45-48,共4页Journal of Huazhong University of Science and Technology(Natural Science Edition)

基　　金：哈尔滨工程大学水声技术国防科技重点实验室基金资助项目(9140C200101080C2005)

摘　　要：为解决由于强亮点源(以下称为干扰)的存在影响对弱亮点源(以下称为目标)的测量和分析,甚至无法得到弱目标噪声源声图的问题,给出了一种聚焦波束形成的零阶和一阶导数共同约束的零陷权(以下称为一阶零点约束权).该权可以在任意给定的多个位置形成零点,取得目标的位置和波形,并抑制干扰的旁瓣,且仅取决于干扰的位置,无需实时解算,运算量小、稳健性高.不同信噪比和信干比条件下,单个和多个干扰的仿真结果表明,该算法在常规的聚集波束形成无法得到目标噪声源声图的情况下,可以在单个或多个干扰位置形成零点,得到目标噪声源的声图.A weight constrained by zero and first derivative （one order null） based on focused beamforming was proposed. The weight was used to receive weak source＇s （target） acoustic image, when the strong source （coherence interference） interferences exist. The performance of acoustic image measurement technique （focuse beamforming） was poor. The weight can put null on the given positions which were only decided by the interference s positions. The weight also has advantages in high robustness and low computation account which doesn＇t have to be calculated on real time. Simulations of single and multiple interferences on the condition of different signal interference ratio were given. Results show that the new weight can get target＇s image while putting nulls on the coherent interference s position.

关 键 词：声图 聚焦波束形成 零点约束权 相干干扰 目标 

分 类 号：TB566[交通运输工程—水声工程]