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浙江大学学报(工学版)  2020, Vol. 54 Issue (5): 972-977    DOI: 10.3785/j.issn.1008-973X.2020.05.015
地球科学     
宽带参量阵在浅地层剖面测量中的应用
周晗昀(),黄善和*()
浙江大学 海洋学院,浙江 舟山 316022
Application of broadband parametric array in sub-bottom profile measurement
Han-yun ZHOU(),Shan-he HUANG*()
Ocean College, Zhejiang University, Zhoushan 316022, China
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摘要:

为了提高宽带参量阵的探测精度,提出参量阵浅地层剖面仪的系统设计. 以换能器阵列作为声发射装置,相较单个换能器能显著提高声源的指向性,有效抑制旁瓣. 利用参量阵的非线性自解调模型,对比分析线性调频信号自解调前、后的波形与频谱变化,分析得出自解调信号的频宽扩展为原信号的2倍,且带宽内信号幅值满足每倍频程12 dB的增长态势. 据此设计改进匹配滤波器来进行脉冲压缩,并通过频谱修正来抑制频谱变化. 仿真结果表明,该宽带参量阵的换能器阵列具有较好的指向性,根据自解调信号和原频信号同指向性的原理,保证自解调信号的高指向性. 提出的改进脉冲压缩技术能进一步提高探测分辨率,通过选择合适的调频范围,距离分辨率可以达到7.5 cm,可以实现高精度的海底地层探测.

关键词: 宽带参量阵地层探测指向性线性调频信号脉冲压缩    
Abstract:

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.

Key words: broadband parametric array    sub-bottom profile measurement    directivity    linear frequency modulation signal    pulse compression
收稿日期: 2019-04-19 出版日期: 2020-05-05
CLC:  TB 566  
基金资助: 国家科技重大专项资助项目(2017YFC0307703)
通讯作者: 黄善和     E-mail: 11634017@zju.edu.cn;davidhuang@zju.edu.cn
作者简介: 周晗昀(1994—),女,博士生,从事地层探测与反演研究. orcid.org/0000-0002-5574-0749. E-mail: 11634017@zju.edu.cn
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引用本文:

周晗昀,黄善和. 宽带参量阵在浅地层剖面测量中的应用[J]. 浙江大学学报(工学版), 2020, 54(5): 972-977.

Han-yun ZHOU,Shan-he HUANG. Application of broadband parametric array in sub-bottom profile measurement. Journal of ZheJiang University (Engineering Science), 2020, 54(5): 972-977.

链接本文:

http://www.zjujournals.com/eng/CN/10.3785/j.issn.1008-973X.2020.05.015        http://www.zjujournals.com/eng/CN/Y2020/V54/I5/972

图 1  参量阵浅地层剖面仪系统组成
图 2  单个换能器指向性
图 3  5×5换能器阵列指向性
图 4  LFM和PALFM在时域上的比较
图 5  LFM和PALFM在频域上的比较
图 6  传统匹配滤波器脉冲压缩结果
图 7  传统和改进匹配滤波器脉冲压缩对比
图 8  频谱修正前、后信号频谱对比
图 9  PALFM频谱修正后脉冲压缩结果
图 10  模拟地层回波信号
图 11  改进匹配滤波地层剖面测量结果图
图 12  PALFM与回波信号互相关结果图
图 13  不同频宽的PALFM脉冲压缩对比
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