线列阵甚宽频带恒定束宽的数字实现方法  

Digital implementation of constant beamwidth for line array over a very wide frequency range

作　　者：方华[1] 吴国清[1] 马力[1] 

机构地区：[1]中国科学院声学研究所,北京100080

出　　处：《应用声学》2006年第4期222-228,共7页Journal of Applied Acoustics

摘　　要：线性嵌套阵可以很好地在很宽的频率(N个倍频程,N=7)上实现恒定束宽。这种方法设计简单,又节省线阵阵元。本文给出了线性嵌套阵具体的数字化实现方法,解决了FIR滤波器设计,滤波器时间延迟等问题。由于数字化实现过程中使用了很多组FIR滤波器,计算量很大,文章采用了DSP信号处理板实现数字化算法,利用DSP处理板可以多任务同时处理优势,解决了计算量大的问题。经过实验验证,在DSP上实现的数字化的线性嵌套阵宽带恒定束宽方法满足了工程上实时处理的需要。A nesting line array can maintain the constant beamwidth over a very wide frequency range （N octaves, N = 7）. The nesting array is simple and needs fewer transducers. This paper realizes the digital implementation of a nesting line array for maintaining the constant beamwidth and solves the problem of the design of FIR filters as well as that of the time delay of filters. The magnitude of calculation of the implemen- tation is very large because of the using of many FIR filters. ADSP has the advantage of processing multitasks at a time. The paper gives the program of achieving the N-octaves constant beamwidth on DSP. It is proved by experimental results that the calculation speed on a DSPcan meet the real-time speed of project application.

关 键 词：恒定宽度波束 宽频带 线形嵌套阵 FIR滤波器 DSP 

分 类 号：TP271.6[自动化与计算机技术—检测技术与自动化装置] TN911.7[自动化与计算机技术—控制科学与工程]