Multi-channel Transponder Design And Implementation

Target strength is an important parameter of sonar equation,which provides a reliable reference for the study of sonar design,target detection and target characteristics research.The trial of the underwater target strength is generally carried out in shallow water,and "transponder method" is most accurate among the three commonly used methods,but it will still be subject to the space fluctuation of the sound field,especially when the target scale is large,it is difficult to accurately measure accurately.In such cases we design a set of multi-channel transponder system combing multiple transponders and highlights of the targets,reaction launch capability in different parts of the test target.According commonly transponder configuration,the system is designed a filter multi-channel receiver filter amplifier circuit,the transmitter is designed with excellent linearity Class AB amplifier,and through impedance matching method achieve the amplifier and transducer matching work,accomplished the above the circuit schematic and PCB diagram.Digital signal processing platform as the core to the transponder,using DSP and FPGA architectures for hardware circuit to achieve real-time for the system,after launching and initializing of ADSP-TS201,copy-related and dual-Alpha filter is utilized for signal detection.FPGA controls the Timing the of audio acquisition chip CS5386 and data playback chip DAC8331.Finally,the signal acquisition,signal detection in real-time,data acquisition and storage,hardware circuit receiver module and performance testing and launching the module are tested of the system software.All above achieved the design indicators and achieved functionality.