认知水声通信中信号发生器的设计

Design of Signal Generator for Underwater Cognitive Acoustic Communication

水声信号发生器是认知水声通信中的关键设备之一,其宽频带输出功能是实现动态频谱接入的基础,但目前市面上的水声设备普遍存在价格昂贵,产生信号带宽窄的问题。为此,设计了一种用于认知水声通信的信号发生器,介绍了各个功能模块的具体实现。使用低成本的MSP430单片机、压控振荡器、电流及温度传感器等组成闭环控制系统,并设计了适用于宽频水声换能器的信号匹配电路。实际测试结果表明,系统能够有效实现宽频带内水声换能器的调谐匹配,稳定输出1KHz-200KHz频段内的2ASK信号。

Underwater acoustic signal generator is the key equipment of underwater cognitive acoustic communication,and its wideband output function is the basis of dynamic spectrum access. However,the current underwater acoustic equipment is expensive,and most of them just generate the narrow bandwidth signals. This paper presents a design of the signal generator for underwater cognitive acoustic communication. Every module is described in detail. A closed-loop control system using low-cost MSP430 microcontroller,voltage controlled oscillator,current and temperature sensors,as well as a matching circuit is proposed. The final results of the experiments prove that the acoustic signal generator can drive broadband underwater acoustic transducers efficiently with 2ASK signals in bandwidth of1KHz-200 KHz.