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Imaging method used for ground penetrating radar concentric circle echo data

A technology of echo data and ground penetrating radar, which is applied in the field of high-resolution two-dimensional imaging, can solve the problem that the imaging algorithm cannot process echo data and imaging, and achieve the effect of fast calculation speed and simple imaging process.

Active Publication Date: 2014-03-12
NAT UNIV OF DEFENSE TECH
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Problems solved by technology

At this time, the classical imaging algorithm cannot be directly used for the processing and imaging of the echo data, and special imaging methods need to be studied

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  • Imaging method used for ground penetrating radar concentric circle echo data
  • Imaging method used for ground penetrating radar concentric circle echo data
  • Imaging method used for ground penetrating radar concentric circle echo data

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Embodiment Construction

[0013] Specific embodiments of the present invention will be described in detail below in conjunction with the accompanying drawings.

[0014] figure 1 is the imaging flow chart.

[0015] refer to figure 2 , it is known that the echo data of GPR concentric circles are distributed in concentric circles in space, where the number of concentric circles is M, the maximum radius of the concentric circles is L and the concentric circles are distributed on the same plane with the same interval Δr, that is M=L / Δr, there is no echo data at the center of the circle; N echoes are evenly distributed on the circumference of each concentric circle with the same angular interval Δθ, then N=2π / Δθ. The distance from the target center to the concentric circle plane is R 0 , filled with a medium with relative permittivity ε. Let the radar transmit signal be continuous wave with equal amplitude, and the center frequency is f 0 , the wavelength in the medium is in c=3×10 8 m / s is the wa...

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Abstract

The invention provides an imaging method used for ground penetrating radar concentric circle echo data. The technical scheme comprises the following steps: firstly correcting phase of the GPR (ground penetrating radar) concentric circle echo data, then removing carrier frequency of the concentric circle echo data with corrected phase, then carrying out Fourier transform along the diameter direction of the concentric circle echo data to obtain echo frequency domain data, finally drawing a circle to each point of the concentric circle echo data by taking a connection line from the center of an concentric circle to the point as a diameter, and overlapping the echo frequency domain data near the circumference of the circle for averaging to be used as an output value of the point so as to obtain an imaging result. By utilizing the imaging method, echo data having concentric circle distribution can be imaged, and the concentric circle echo data is identically treated in every direction by the imaging method, thus the imaging method has isotropy, the imaging treatment process is simple, and the computing speed is high.

Description

technical field [0001] The present invention relates to a ground-penetrating radar imaging method, and more specifically relates to detecting a target by using the radar to penetrate the medium under near-field conditions and collecting echo data distributed in concentric circles, and processing the echo data to realize high-resolution two-dimensional method of dimensional imaging. Background technique [0002] Ground penetrating radar (GPR) imaging refers to the technology that the radar emits electromagnetic waves to penetrate one or more layers of media to observe the target and collect the echoes for processing to obtain the target image. GPR imaging technology has the following characteristics: first, the target is in the near-field area, because the electromagnetic wave has a large attenuation after penetrating the medium, and the distance from the radar to the target is generally relatively short; second, the target is generally a stationary or slow-moving target. GP...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G01S13/89
Inventor 粟毅朱宇涛黄春琳陆珉李禹唐涛
Owner NAT UNIV OF DEFENSE TECH
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