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Maximum entropy principle-based shallow sea water flow field acoustic tomography method

A technology of maximum entropy and flow field, applied in the field of acoustic tomography of shallow sea flow field, can solve problems such as inverse medium problem that cannot be obtained analytical solution, propagation model error, etc.

Inactive Publication Date: 2016-07-20
ZHEJIANG UNIV
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Problems solved by technology

[0004] Due to the noise in the observation superposition and the error in the propagation model, the analytical solution of the inverse medium problem cannot be obtained, and the optimal solution can only be obtained under appropriate criteria. Finding the best solution also needs to be achieved through iterative recursion

Method used

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  • Maximum entropy principle-based shallow sea water flow field acoustic tomography method
  • Maximum entropy principle-based shallow sea water flow field acoustic tomography method
  • Maximum entropy principle-based shallow sea water flow field acoustic tomography method

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Embodiment Construction

[0049] The present invention will be further described below in conjunction with the accompanying drawings and specific examples to verify the effectiveness of the present invention. figure 1 It is the working flow chart of the shallow sea acoustic tomography method based on the principle of maximum entropy in the present invention, and the specific implementation process is as follows (the calculation part adopts the corresponding formula in the content of the invention):

[0050] (1) Conduct acoustic tomography experiments in a certain sea area to measure the velocity field. The marine environment is a square area with a depth of 100 meters and a side length of 10 km. On the four sides of the area, 16 sending and receiving reciprocal nodes are placed on average. The sound propagation path is as figure 2 shown.

[0051] (2) The real flow field is the inversion target flow field such as image 3 As shown, according to the prior information, it is assumed that the sound vel...

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Abstract

The invention discloses a maximum entropy principle-based shallow sea water flow field acoustic tomography method. According to the method, transmitting-receiving nodes are arranged in a sea area to be tested, so that measured acoustic signals can be obtained; the transmission delay difference of the same path in an opposite direction is obtained; prior flow field information is utilized to construct the relationship of the measured delay difference and flow field distribution, and an inversion mathematical model is constructed; the inversion mathematical model is solved by using the maximum entropy principle; and a convergence solution is obtained by using an iterative method. As indicated by simulation instances, the maximum entropy principle-based shallow sea water flow field acoustic tomography method can be utilized to construct two-dimensional flow field information of the target sea area by using the transmission delay difference and achieve higher least-square accuracy.

Description

technical field [0001] The invention belongs to the acoustic tomography method of shallow sea current field, in particular to an ocean acoustic tomography method based on the maximum entropy method. Background technique [0002] Ocean acoustic monitoring technology is an important technical field in the process of human understanding, development and utilization of the ocean. For mesoscale and large-scale ranges, ocean acoustic tomography technology is the most concerned. Similar to computer tomography (CT) in medicine to detect lesions in the human body, ocean acoustic tomography uses propagation delay or other acoustic observations to calculate the internal information of the ocean that the sound field passes through, mainly including the sound velocity field and flow velocity field in the ocean. Since the information such as the propagation time delay of the observation is a function of the ocean parameters such as the sound velocity profile, the reconstruction of the oce...

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01S7/539
CPCG01S7/539
Inventor 吴宇威赵航芳
Owner ZHEJIANG UNIV
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