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Amplitude weighting-based ground penetrating radar back projection imaging method

A ground-penetrating radar and back-projection technology, applied in the field of radar imaging, can solve problems such as poor imaging results, hyperbolic inability to focus, affecting target detection and positioning, etc., and achieve the effect of improving accuracy and suppressing ability

Active Publication Date: 2016-09-28
HARBIN INST OF TECH
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Problems solved by technology

The problem with this type of method is that when there is a layered medium, it does not meet the initial conditions of the method, so that the Stolt interpolation cannot find the echo value in the frequency domain well, resulting in poor imaging results, and the hyperbola cannot be focused, which seriously affects the target detection and localization

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specific Embodiment approach 1

[0026] The ground-penetrating radar back projection imaging method based on amplitude weighting in this embodiment, combined with Figure 6 The flow chart of described method is realized through the following steps:

[0027] Step 1. Set the total number of channels of the ground penetrating radar as M, and calculate the round-trip time delay from any imaging point A to each channel in the imaging area. Then, the round-trip time delay τ from imaging point A to the kth channel A,k Expressed as:

[0028] τ A , k = 2 ( x k - x A ) 2 ...

specific Embodiment approach 2

[0036] The difference from Embodiment 1 is that in the amplitude-weighted GPR backprojection imaging method of this embodiment, the process of calculating the scattering response amplitude of imaging point A in each channel described in step 2 is as follows. The echo of each channel of the ground radar is r k (t) means, and then get the scattering response amplitude x of imaging point A in each channel A,k x respectively A,k = r k (t), t=τ A,k ; In the formula, k represents the channel number, and k=1,2,...,M.

specific Embodiment approach 3

[0037] The difference from the specific embodiment 1 or 2 is that, in the amplitude-weighted ground-penetrating radar back-projection imaging method based on the amplitude weighting of this embodiment, the process of constructing the window function W described in step 3 is as follows:

[0038] Step 31. Set the horizontal area of ​​the hyperbola to correspond to m channels, respectively k 1 ,k 2 ,...,k m ; Edge extraction is performed on the obtained ground-penetrating radar B-scan image, and the response amplitudes corresponding to the points on the hyperbola are respectively u 1 ,u 2 ,..., u m , and construct a 1×M-dimensional vector W', and:

[0039]

[0040] Among them, M represents the total number of channels, and m represents the number of channels occupied by the ground-penetrating radar echo hyperbolic horizontal area;

[0041] Step 32, set the total channel number M and the channel number m corresponding to the hyperbola to be even numbers,

[0042] Step 33:...

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Abstract

The invention discloses an amplitude weighting-based ground penetrating radar back projection imaging method, which belongs to the field of radar imaging. The traditional back projection imaging method has the problem of insufficient clutter and noise suppression ability. According to the amplitude weighting-based ground penetrating radar back projection imaging method, as for any imaging point A, time delay is used for calculating a scattering response amplitude xA,k=rk(t), and t=tauA,k of the imaging point in each channel; a response amplitude corresponding to a point on hyperbolic echo is acquired through edge extraction to form a window function; weighting is carried out on the scattering response amplitude xA,k of each channel, and imaging on the A point is completed through coherent superposition; and all imaging points are traversed to complete the entire imaging process. The window function is used for carrying out weighting processing on the scattering amplitude, the target detection precision is improved, and the noise and clutter interference suppression ability is improved.

Description

technical field [0001] The invention belongs to the field of radar imaging, in particular to an amplitude-weighted ground-penetrating radar back projection imaging method. Background technique [0002] Ground Penetrating Radar (GPR) transmits high-frequency electromagnetic waves to the underground medium, and uses the reflection and scattering of electromagnetic waves at the discontinuity of the electromagnetic properties of the medium to achieve underground target detection and recognition. With the development of signal processing technology and the improvement of electronic devices, high-resolution data processing and target imaging technology have become the most promising processing methods for ground penetrating radar. [0003] The echo model of ground penetrating radar with respect to an ideal point target has a hyperbolic shape. In order to improve the azimuth resolution of the image, synthetic aperture imaging (SAR) is generally used to focus on the hyperbola to ac...

Claims

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Application Information

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IPC IPC(8): G01S13/88G01S13/90
CPCG01S13/885G01S13/904G01S13/9017
Inventor 李高鹏张明昊谢青青田文龙赵彬
Owner HARBIN INST OF TECH
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