基于TMS320C5416的CZT鉴频系统的实现

Development of CZT Demodulation System Based on TMS320C5416 Chip

为了满足水声跳频通信对鉴频系统分辨率的要求,本文提出了利用线性调频变换的方法进行频谱分析,给出了基于TMS320C5416芯片线性调频变换(CZT)快速实现的硬件和软件解决方案,并对工程实现中遇到的几个具体问题进行了详细说明.研究表明,该系统满足水声跳频通信对鉴频速度和分辨率的要求,并已应用于水下E-mail传输系统中.

Underwater acoustic （UWA） channel is a random time-varying and frequency-varying channel. Frequency hopping （FH） technology is a simple and efficient way to solve the problem of inter-symbol interference （ISI） caused by the multipath. But underwater acoustic frequency hopping communication requires high resolution of frequency demodulation. In order to meet this requirement, the present article discusses Chirp-Z transformation method. The arithmetic of Chirp-Z transformation as well as the hardware and software implementation is illustrated in the paper. The system consists of TMS320C5416 digital signal processor,PCM3002 A/D converter and extended output circuit. Because the traditional executing flow is not efficient enough, four optimizing methods are illustrated. As a result, this system can meet the speed and resolution requirement of underwater frequency hopping communication. It is also applied to underwater E-mail transportation project.