刚性球上圆阵波束设计及性能仿真  

Beam Pattern Design for Circular Array with a Rigid Sphere and Performance Simulation

作　　者：张成[1] 陈克安[1] 杨志兴[2] 

机构地区：[1]西北工业大学航海学院,西安710072 [2]中国电子科技集团公司第四十一研究所,山东青岛266555

出　　处：《火力与指挥控制》2010年第11期125-128,137,共5页Fire Control & Command Control

摘　　要：分析刚性球对圆阵响应的影响。设计两个特征波束形成阵列,推导了阵列白噪声增益和指向性指数的定量表达式,并和延迟求和波束形成阵列以及不存在刚性球时的白噪声增益和指向性进行了对比分析。仿真结果表明,所设计的两个特征波束形成阵列具有频率不变的指向性,但在低频段牺牲了阵列的鲁棒性;延迟求和波束形成处理在整个频率段具有较好的鲁棒性,但随频率的降低其波束指向性下降。刚性球可以改善阵列的鲁棒性,并能提高延迟求和波束形成阵列的指向性。The influence of a rigid spherical baffle on a Uniform Circular microphone Array （UCA） response is analyzed. Expressions of White Noise Gain （WNG） and Directivity Index （DI） are derived for the arrays designed in this paper. The WNG and DI of designed arrays are compared with those of delay-and-sum beamforming array using UCA with and without a rigid cylindrical baffle respectively. Computer simulations demonstrate that the designed array have frequency-independent directivity,which is achieved at the cost of reduced robustness at low frequency band. The delay-and-sum beamforming array has constant WNG throughout the whole frequency band,while the DI is reduced in low frequency band. The WNG of all these arrays are improved and the DI of the delay-and-sum beamforming array is increased with a certain extent when there is a rigid spherical baffle.

关 键 词：圆阵 波束形成 白噪声增益 指向性指数 

分 类 号：TN911.7[电子电信—通信与信息系统]