Design and experimental research on shallow water volume reverberation signal acquisition system

2009 IEEE 8th International Conference on ASIC Pub Date : 2009-12-11 DOI:10.1109/ASICON.2009.5351539

Yongwei Liu, Qi Li, Mengying Chen

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Abstract

Volume reverberation is the main interference of active sonar in shallow coastal waters. This greatly limits the sonar's working range and the performance of parameter estimation. A lot of research on the properties of deep scattering layer, sea surface reverberation, sea bottom reverberation has been done. However, the research on volume reverberation at 10 to 40 kHz in shallow coastal waters is only a little. It is difficult to collect shallow water volume reverberation signal by conventional underwater acoustic signal acquisition equipments with an electrical switch, due to circuit obstruction. Therefore, based on the characteristic of volume reverberation, a signal acquisition system was designed. The control core was made up of Field Programmable Gate Array (FPGA). The signal acquisition system was tested in shallow coastal waters. The law of volume backscattering intensity with temperature, salinity, the concentration of suspended sediment particles, and frequency is summarized. The results demonstrate that the volume backscattering intensity may be changed by 30 dB, due to the concentration change of suspended sediment particles.1

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浅水体积混响信号采集系统的设计与实验研究

体积混响是浅海主动声呐的主要干扰。这极大地限制了声纳的工作范围和参数估计性能。对深散射层、海面混响、海底混响的特性进行了大量的研究。然而，对沿海浅海10 ~ 40khz的体积混响的研究还很少。传统的带开关的水声信号采集设备由于电路的阻塞，难以采集浅水体积混响信号。因此，基于体积混响的特点，设计了一种信号采集系统。控制核心由现场可编程门阵列(FPGA)组成。对信号采集系统进行了浅海测试。总结了体积后向散射强度随温度、盐度、悬浮颗粒浓度和频率的变化规律。结果表明，由于悬浮颗粒浓度的变化，体积后向散射强度可变化30 dB

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2009 IEEE 8th International Conference on ASIC

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