The Design And Implementation Of High-precision Underwater Acoustic Signal Acquisition And Playback Module Circuit

With the continuous development of modern integrated circuits as well as thetheory of digital signal processing technology increasingly sophisticated and mature, thedigitized signal processing with its obvious advantages have been more and morewidely used. Digital signal processing has played a major role in the field of biomedicalengineering, acoustic engineering, seismic, radar, communications, voice, and image.The majority of the nature of the signal is an analog signal, therefore, the signal isdigitized processing often requires digital to analog conversion, analog-to-digitalconversion. This subject of underwater acoustic signal synchronous capture-playbackcircuit module main function is the collection, storage and playback of high speedprecise acoustic signals. It is the core component of the sonar system. At the time ofdata processing, the circuit module adopts18bit resolution,2MHz sampling rate of theADC and DAC. Real-time storage and playback massive amounts of data using a largecapacity FLASH, which generated by the high-speed and high-precision conversion. Inaddition, also designed a standard RS-485communication interface can facilitate therealization of the remote multi-point signal acquisition system. The main feature of thecircuit module is a wide range of signal processing frequency, covering all sonic range.In the full amplitude and full frequency range, to ensure have the0.5dB gain error, withhigh precision indicators.The module circuit uses a forward approach to design and development. It is adedicated circuit for underwater acoustic acquisition and playback system, The corecomponent of the digital signal processing, Can completely replace the old-fashionedanalog tape machine storage.This thesis describes the overall design of the architecture and design principles ofthe entire circuit module, and then discusses the specific design of the functional circuit,followed by the description of the procedures of analog signal processing and the designand development of the FPGA program. Finally, the layout design and debugging testresults and make a design summary.