Design Of Signal Acquisition,transmission And Processing Circuit For Acoustic Wave Glider

Acoustic wave glider is a kind of unmanned offshore platform equipped with acoustic detection equipment.In recent years,with the deepening of ocean exploration,acoustic wave gliders have gradually attracted the attention of various countries because of their advantages of unmanned,autonomous and intelligent.The load capacity,energy supply capacity and communication support capacity of the acoustic wave glider is limited.In terms of load and power supply,it contradicts the requirements of the acoustic array for deep towing,continuous acquisition of ocean acoustic signals,and real-time extraction of important features of the target.Based on the above requirements,this paper studies the acoustic data acquisition,transmission,and processing technology under high depth and low power consumption.A small size,low power consumption,and high-precision self contained storage distributed acquisition,transmission,and processing circuit has been designed.Firstly,starting from the demand for acoustic information acquisition of acoustic wave gliders,the technical indicators for data acquisition,transmission,and storage of AWG are proposed based on the characteristics of wave glider.Secondly,the data acquisition and processing technology of wave glider under the constraints of energy,volume and processing capacity is studied.The data acquisition technology based on AWG,data error correction calibration technology,PL-PS interaction technology based on AXI interface,data self-contained storage technology,ZYNQ and PC interaction technology based on Ethernet are studied.Thirdly,the low-voltage DC carrier transmission technology based on AWG was studied.This section studies time synchronization technology,and by analyzing and comparing three time synchronization schemes,it is determined to use the water surface time synchronization method,which can achieve synchronization accuracy of less than 29μs.By studying the transmission characteristics of coaxial cables,a data transmission method that adjusts the transmission power according to different communication frequencies is proposed.This method can significantly reduce the energy loss caused by long-distance small data transmission.Finally,the equipment was debugged and verified at sea.It is verified that the acquisition,transmission and processing technology of the whole circuit can meet the use requirements.This set of equipment has carried out long-term experiments in the South China Sea and the Yellow Sea.The equipment has normal acquisition,transmission and processing functions,and can accurately obtain the feature information of the target.