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A Fast Microwave Imaging Method

A microwave imaging and fast technology, applied in the radio wave measurement system, radio wave reflection/re-radiation, instruments, etc., can solve the problems of slow inversion speed, achieve high inversion speed, high image quality, and reduce the amount of calculation Effect

Active Publication Date: 2021-10-08
杭州泛利科技有限公司
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Problems solved by technology

[0005] The technical problem to be solved by the present invention is the slow inversion speed of the traditional three-dimensional microwave imaging method, and a fast microwave imaging method is proposed, which uses the modified MS-DBIM based on the deformed Born approximation (DBIM) inversion algorithm On the basis of , an efficient direct problem solver is integrated. The solver uses an interpolation algorithm independent of the integral kernel, that is, the multi-layer Green's function interpolation algorithm (MLGFIM). This solver can be named MLGFIM-Solver .The advantage is that in each iteration of the DBIM algorithm, by calling this efficient direct problem solver, we can calculate the direct problem relatively quickly to improve the inversion speed

Method used

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  • A Fast Microwave Imaging Method

Examples

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Embodiment 1

[0083] like Figure 4 Example 1 is a ball having two radius of 0.5λ, and the relative dielectric constant of two balls is 1.5, and their center coordinates are (0, 0.5λ, 0), (0, 0.5λ, 0). During the iteration of MS-DBIM-MLGFIM, the imaging area was discrete to 32 × 32 × 32 mesh, through 18 iterations, Figure 5 For the imaging result of the method of the invention, Figure 5 (A), (b), (c) are cross-sectional views of Z = 0, x = 0, y = -0.5λ, respectively, respectively. It can be seen that the inversion algorithm MS-DBIM-mLGFIM can accurately perform the position and size of two balls, and can estimate that their relative dielectric constant is approximately 1.5.

[0084] Simulation Example 2

[0085] In order to further verify the effectiveness of the proposed method, the method is tested with a more complex design goal. This unknown consists of two spheres and U-shaped structures, such as Image 6 Indicated. The balls of the two spheres are located in (0, -0.5λ, 0.4λ), (0, 0.5λ, 0.4λ...

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Abstract

The invention discloses a fast microwave imaging method. In each iteration of the DBIM algorithm, the inversion speed is improved by calling this efficient direct problem solver to calculate the direct problem. At the same time, in order to make the whole inversion algorithm perform iterative inversion stably, the truncated singular value decomposition (TSVD) technique is adopted, which avoids a large number of numerical tests to determine the regularization term. In order to further reduce the amount of calculation, in the cost function of the inversion algorithm, the incident field is used instead of the total field. Therefore, the invention can perform inversion quickly and stably, ensuring the image inversion speed and quality.

Description

Technical field [0001] The present invention belongs to the technical field of microwave imaging, microwave imaging, a fast method. Background technique [0002] Microwave imaging techniques to study a variety of complex media microwave propagation and scattering, based on the measurement data measured by the fringe field of the external medium, the complex dielectric constant reconstructed image of the interior of the test medium. The measured scattered field carries a lot of information about the scatterer, scattering using a priori knowledge about the target, after appropriate mathematical treatment of the scattering body can be extracted itself has certain characteristics, such as the shape of the scattering body, a dielectric constant of distribution. Because microwave imaging enables nondestructive testing of the target, while the target can be imaged and physical imaging geometry, and with a higher resolution, and therefore a wide range of microwave imaging techniques use ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G01S13/89G01S7/41
CPCG01S7/41G01S13/89
Inventor 徐魁文刘林春赵鹏王高峰
Owner 杭州泛利科技有限公司
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