Design And Implementation Of The Underwater Acoustic Communication Transceiver

This paper designs an underwater acoustic communication transceiver,which can cooperate with underwater equipment to complete the functions of communication and distance measurement.It can realize three functions: transponder remote control command detection,transponder distance measurement and high-speed underwater acoustic communication.Firstly,this paper expounds the design basis of underwater acoustic communication transceiver from the perspective of design demand analysis and overall system design.On this basis,this paper expounds the design idea of underwater acoustic communication transceiver,and completes the scheme design.The electronic platform architecture of the system is designed,the software design of signal processing and control unit,the hardware design and implementation of receiver unit and the software development of signal generation unit are completed,and the functions of data acquisition,data storage and signal processing are realized at the same time.Then,the algorithms used in underwater acoustic communication transceiver were simulated.For the remote control command signal,this paper selects the adaptive notch filter for filtering,and uses the Variance-of-Instantaneous-Fequency Detector(VIFD)and energy detector to jointly detect the command signal.Underwater acoustic communication transceiver uses time delay for distance measurement,so this paper studies the copy correlation algorithm and its fast implementation.The transceiver uses orthogonal frequency division multiplexing(OFDM)technology to realize high-speed underwater acoustic communication.This paper studies the synchronization technology,channel coding,channel estimation and equalization,guard interval.Then this paper introduces the software platform of underwater acoustic communication transceiver.The software platform is written by QT,and the main interface of the software is built.The pulse width modulation(PWM)signal transmitting function of the signal transmitting module,the acquisition function of the signal acquisition module,the storage function of the data storage module,the command detection,distance measurement and high-speed underwater acoustic communication signal receiving and decoding of the data processing module are all realized.Finally,some functions of the underwater acoustic communication transceiver designed in this paper are tested,mainly including PWM signal transmission test,receiving circuit test,data acquisition function test and signal processing function test.