一种窄带水声信号数字处理系统

针对窄带水声接收机参数估计精度低、目标识别能力差的弱点,提出了数字鉴宽的概念及方法,利用复杂可编程逻辑器件(Complex Programmable Logic Device, CPLD)实现对窄带水声信号宽度的精确识别.该方法可广泛适用于数字滤波和机械滤波窄带水声接收电路,鉴宽结果性能稳定、可靠,可满足大多数窄带水声系统对信号及其宽度识别的精度要求.同时,根据实际水声系统对水声接收机增益调节的需要,提出了利用MSP430单片机及 D/A器件实现水声接收机手动及自动增益控制的方法,它可应用于各种水声接收电路中.所提出的窄带水声信号处理方法有算法简便、实用的优点,使用的理想效果在实际应用中得到了验证.

A system of narrowband underwater acoustic digital signal processing

Aiming at the defects of the low precision of parameter estimation and the pool ability of target identification of narrow band underwater acoustic receiver, this paper introduces the concept and method of digital width differentiator and utilizes CPLD(Complex Programmable Logic Device) to realize the exact differentiation of narrowband signal width. The method can be used for the underwater acoustic receiver with digital filter and machine filter. The result of the width differentiation indicates that the method is stable and reliable, which satisfies the demand for most underwater acoustic systems in the precision of width differentiation and the ability of signal identification. Meanwhile, for the need of gain adjustment in practical underwater acoustic receiver, the MSP430 and D/A device are used to realize manual and automatic gain control, which can be used for all kinds of underwater acoustic receiver. The algorithm proposed in this paper is simple and convenient, and the effect is validated in the practical application.