Design And Implementation Of Software And Hardware For Underwater Acoustic Acquisition And Storage Unit

There is a large amount of noise generated by ships,organisms,geological changes,etc.in the ocean,which is the main interference source of underwater acoustic channels when conducting underwater exploration or communication.At the same time,various marine environmental information can also be obtained through inversion of marine environmental noise.Therefore,it is very important to obtain the characteristics and working models of marine environmental noise by analyzing a large amount of effective noise data.In order to obtain a large amount of noise data with a wide frequency range,the acquisition and storage unit designed in this article uses a high sampling rate analog-to-digital conversion chip,and stores the collected data into a large capacity TF card.At the same time,a remote control unit has been designed for remotely controlling the startup of equipment and monitoring its storage status in real-time.A underwater acoustic acquisition and storage unit with underwater acoustic remote control function was designed by combining the acquisition and storage unit with the remote control unit.This article specifically completes the hardware design,functional simulation,and FPGA based logical function design of the acquisition and storage unit and remote control unit.Among them,the hardware part has completed the device selection,schematic drawing,and PCB drawing of analog-to-digital conversion circuits,storage circuits,data cache circuits,control circuits,and analog-to-digital conversion circuits;The simulation section used relevant software and MODELSIM to complete the simulation of the BFSK demodulation algorithm based on Notch filtering;The logic function design section uses Verilog language to design analog-to-digital conversion logic,data cache logic,data storage logic,address storage logic,Notch filtering logic,adaptive threshold logic,remote control instruction logic for detection,and response signal logic.The collection and storage unit designed in this article has an adjustable sampling rate of up to 1MSPS,three channels for simultaneous collection,and a storage capacity of 2TB.At the same time,the remote control unit can detect underwater acoustic remote control commands,then perform corresponding operations and reply to corresponding response signals based on the command content,and the remote control distance that can be achieved is not less than 2km.