Journal of Jilin University(Earth Science Edition) ›› 2019, Vol. 49 ›› Issue (6): 1788-1794.doi: 10.13278/j.cnki.jjuese.20180349

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Extended Diffraction CT Technique for Inversion of Acoustic Parameters of Porous Seabed

Zhang Peizhen1, Mo Bingge1, Wang Bin2   

  1. 1. College of Electronics and Information Engineering, Guangdong Ocean University, Zhanjiang 524088, Guangdong, China;
    2. State Key Laboratory of Ocean Engineering, Collaborative Innovation Center for Advanced Ship and Deep-Sea Exploration, Shanghai Jiao Tong University, Shanghai 200240, China
  • Received:2018-12-29 Published:2019-11-30
  • Supported by:
    Supported by National Natural Science Foundation of China (11774229) and Guangdong Province Educational Science Planning Project (2017GXJK066)

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Abstract: Acoustic parameters such as sound velocity, density, and porous structure of seafloor sediments are important for describing seabed, and are necessary for engineering application in sound field numerical prediction and coastal engineering. Based on the backscattering characteristics of the seabed, we extended the diffraction CT technique and re-deduced the relationship between the target scattering intensity and the relevant image spectral sample of the bistatic system. Quartet structure generation set is used to construct the image model of the sound field. When LFM wave is incident from a single direction, the image inversion is retrieved by using the finite sparse sample of the bistatic sound field. The frequency interval and direction number, which affect the acoustic parameter accuracy, are obtained. The porosity and mean impedance indices of sediments are further inversed. Compared with the classical numerical calculation method, the computational efficiency of this method is increased by about two orders of magnitude.

Key words: diffraction CT, bistatic system, porous sediments, quartet structure generation set (QSGS)

CLC Number: 

  • O427.2
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