基于FPGA嵌入式设计的水声信号采集系统

Underwater Acoustic Signal Acquisition System Based on FPGA Embedded Design

通过对水声信号采集,实现水声测量、回波模拟和多通道的水声数据记录分析,为进行水下兵器的试验分析提供数据基础。提出一种基于FPGA嵌入式设计的水声信号采集系统设计方法,首先进行系统的总体设计构架和功能模块分析,系统对水声信号的采样通道设置为8通道同步、异步输入,A/D分辨率大于12位,信号放大量为80dB,回放信号形式包括CW、LFM、HFM等多种形式。在硬件模块化设计中,主要对AD模块、复位电路、滤波电路、接收机电路等进行了详细描述,数据采集与处理采用FPGA作为逻辑处理芯片,进行嵌入式设计,在DSP模块进行水声信号采集和实时处理。最后进行系统调试和测试分析,结果表明,该系统进行水声信号采集的抗干扰性较好,漂移失真较小,设计结果能满足水声信号实时准确采集的要求。

By collecting the underwater acoustic signal,underwater acoustic measurement,echo simulation and multichannel acoustic data record analysis is realized,the data base is provided for underwater weapon test analysis.This paper proposes a design method of underwater acoustic signal acquisition system based on embedded FPGA design,first the overall structure design and function modules of the system are analyzed,the sampling channel system of the underwater acoustic signal is set to 8channel synchronous,asynchronous input,A/D resolution is higher than 12,signal gain is 80 dB,the playback signal includes CW,LFM,HFM form and so many forms.In the hardware module design,mainly on the AD module,reset circuit,filter circuit,receiver circuit are described in detail,data acquisition and processing use FPGA as the logic chip to carry out embedded design,acoustic signal acquisition and real-time processing are carried out in DSP.Finally,the system debugging and test analysis results show that the system anti-interference acoustic signal acquisition can drift less distortion,the design results can meet the requirements of real-time and accurate acoustic signal acquisition.