Application of broadband parametric array in sub-bottom profile measurement

被引：0
|
作者：
Zhou H.-Y. [1 ]
Huang S.-H. [1 ]
机构：
[1] Ocean College, Zhejiang University, Zhoushan
来源：
Zhejiang Daxue Xuebao (Gongxue Ban)/Journal of Zhejiang University (Engineering Science) | 2020年 / 54卷 / 05期
关键词：
Broadband parametric array; Directivity; Linear frequency modulation signal; Pulse compression; Sub-bottom profile measurement;
D O I：
10.3785/j.issn.1008-973X.2020.05.015
中图分类号：
学科分类号：
摘要：
A system design of a parametric array sub-bottom profiler was proposed to improve the detection accuracy of the broadband parametric array. Transducer array is used as the acoustic emission device, which can significantly improve the directivity of the sound and effectively suppress side lobes compared with a single transducer. The waveform and spectrum changes of the linear frequency modulation (LFM) signals before and after demodulation were compared and analyzed based on the nonlinear self-demodulation model of the parametric array. The bandwidth of the self-demodulated signal was doubled relative to its original value, and the amplitude of the high-frequency component was higher than that of the low-frequency component, which basically accorded with the growth trend of 12 dB per octave. Based on this, an improved matched filter was designed to perform pulse compression, and the spectrum correction method was introduced to countervail spectrum change. Simulation shows that the transducer array has high directivity and ensures the high directivity of the self-demodulated signal due to the fact that the self-demodulated signal has the same directivity with the primary frequency signal. The improved pulse compression technique can further improve the detection resolution by selecting appropriate bandwidth of LFM signal. The resolution is up to 7.5 cm, enabling high-precision sub-bottom profile measurement. © 2020, Zhejiang University Press. All right reserved.
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页码：972 / 977and995
相关论文
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