Software And Hardware Design Of Vector Acoustic Signal Acquisition And Analysis System

The development and utilization of the ocean is inseparable from the acquisition and research of marine environmental information.In order to obtain marine environmental information,underwater acoustic signal acquisition system is essential.With the emergence of vector hydrophone,people began to use vector hydrophone to collect and record underwater acoustic vector field information.Therefore,the research of vector underwater acoustic acquisition system has become a hot topic.This paper designs a vector underwater acoustic signal acquisition and analysis system,which provides a complete set of software and hardware solutions.It provides a high-performance,high reliability and high portability integrated acquisition and recording equipment for vector hydrophone,vector sound field,vector signal processing and other research fields.This paper is mainly divided into four parts: Overall,hardware,software design and system testing.First of all,the overall scheme design is carried out according to the use requirements,the selection of vector hydrophone,the design of hydrophone suspension structure,system interface,system functions and indicators.System hardware design is mainly divided into two parts,signal conditioning,acquisition and transmission.In signal conditioning,the very weak signals of 4 channels,which are composed of 3 vibration velocity channels and 1 sound pressure channel,are pre amplified and band-pass filtered.The analog signals are digitized and collected by ad7606,and the attitude information of the three-dimensional electronic compass is received by serial port,and then transmitted by FPGA.The software part also includes two parts,FPGA Software and display and control software.FPGA software includes the design and implementation of analog signal acquisition between FPGA and ad7606,RS485 serial communication with sensor and network transmission interface with PHY chip;The display and control software is designed with Lab VIEW,including the design and implementation of parameter configuration,time domain waveform display,spectrum display,attitude display,data storage and playback.Finally,the function realization and performance indicators of the system are tested,and the system circuit self noise,channel consistency,gain and other indicators,acquisition,transmission,storage,data analysis(time domain waveform,spectrum display)and other functions are verified.The test results show that the system design meets the expectations.