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A Waveform Inversion Method for Layered Media Based on Simulated Annealing Algorithm

A simulated annealing algorithm and waveform inversion technology, applied in radio wave reflection/re-radiation, radio wave measurement systems, instruments, etc., can solve the problems of unrecognizable thin-layer media, slow convergence speed, high complexity, etc., and achieve improved Effects of inversion efficiency, parameter reduction, and enhanced adaptability

Active Publication Date: 2019-05-10
GUILIN UNIV OF ELECTRONIC TECH
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Problems solved by technology

However, the existing waveform inversion methods for layered media have shortcomings such as inability to identify thin-layer media, high complexity, slow convergence speed, and low efficiency.

Method used

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  • A Waveform Inversion Method for Layered Media Based on Simulated Annealing Algorithm
  • A Waveform Inversion Method for Layered Media Based on Simulated Annealing Algorithm
  • A Waveform Inversion Method for Layered Media Based on Simulated Annealing Algorithm

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Embodiment

[0039] A waveform inversion method for layered media based on a simulated annealing algorithm, comprising the following steps:

[0040] 1) if figure 1 The underground layered medium model is constructed as shown, and the constructed model is detected by ground penetrating radar, and the original echo signal is processed by the matched filtering method to obtain the actual echo signal;

[0041] 2) Extract the two-way time delay information from the actual echo signal, set the loop control variable, initialize the estimated value of the dielectric constant of each layer of medium, and then obtain the estimated thickness of each layer of medium according to the two-way time delay information and the wave velocity formula;

[0042] 3) Use the estimated parameter values ​​to carry out forward modeling on the constructed model to obtain the simulated echo signal, and obtain the error between the actual echo signal and the simulated echo signal according to the error formula;

[004...

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Abstract

The invention discloses a layered medium waveform inversion method based on a simulation annealing algorithm and brings forward a layered medium waveform inversion method based on a simulation annealing algorithm, for the purposes of reducing the algorithm complexity, improving the convergent speed and enhancing the thin layer identification capability of the method. The method has the following advantages: 1, by use of prior information of a double-pass time delay of electromagnetic waves in each medium layer, parameters of waveform inversion are reduced, the algorithm solving complexity is reduced, and the inversion efficiency is improved; 2, by use of a non-uniform variation idea, through improving a disturbance model of the simulation annealing algorithm, the convergent speed is substantially improved; and 3, through differences between actual echo signals and simulation echo signals, time-delay information covered by strong echoes is extracted, the capability of the algorithm to thin layer medium parameter inversion is enhanced, and the practicality of the algorithm is improved.

Description

technical field [0001] The invention belongs to the technical field of waveform inversion, and in particular relates to a waveform inversion method of a layered medium based on a simulated annealing algorithm. Background technique [0002] Ground Penetrating Radar (GPR) is a non-destructive detection tool widely used in the fields of civil engineering, national defense, archaeology and geological detection. Its basic principle is to obtain the reflected echo due to the inhomogeneity of the underground medium by launching electromagnetic waves into the underground medium. In the practical application of GPR, the waveform inversion method of layered media plays an extremely important role, which can effectively help the detector personnel to obtain the dielectric property information of the near-surface geological structure in the detection area without other prior information and thickness and other parameter information. However, the existing waveform inversion methods for...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G01S13/88
CPCG01S13/885
Inventor 欧阳缮吕昌民谢跃雷晋良念刘庆华姚连明李浩然汪瑞李贝贝王鲁豫
Owner GUILIN UNIV OF ELECTRONIC TECH
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