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Design and Implementation of Receiving and Transmitter Element for Image Sonar

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Tutor: LuFengChun
School: Harbin Engineering University
Course: Underwater Acoustics
Keywords: Imaging sonar,Sonar receiver,Data acquisition,Sonar transmitter
CLC: U666.7
Type: Master's thesis
Year:  2012
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Abstract:
Imaging sonar sonar system as the branch, in the seabed topography, vision navigation,dam monitoring, bridge inspection, pipeline and seabed detection and other applications.Based on this background, through the research of low noise detection theory and high-powertransmission technology, completed the design of imaging sonar system for receiving andtransmitting unit.Papers from the low noise design point of view, combined with the system specifications,design of the160channel signal pretreatment circuit, achieving low noise amplifier, gaincontrol and filtering and other functions. Use reasonable means and methods carefullydebugging, guarantee the multi channel pre processing circuit for consistent characteristics. Inaddition, the paper from the noise and interference sources based on system, grounding andshielding design, effectively reduce the system circuit noise and interference, to ensure theperformance of the system. Imaging receiving unit acquisition circuit based on FPGA chip,completed the A/D acquisition, high speed data transmission and the large capacity datamemory and other hardware circuit design, and through the process to verify the reliability ofthe circuit.Papers from the technical indicators and imaging transmitter characteristics, combinedwith the circuit theory and engineering practice, gives the emission unit detailed designprocess, including power amplifier circuit and power selection of MOSFET, driving circuit,transformer design and each functional circuit design. Realize the system efficiency, highpower transmitter.Experimental results show that the design of pool complete hardware circuit debugging,stable and reliable work, various technical indicators have reached the requirements of thesystem.
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