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Method for inversing railway base track bed contamination rate by using ground penetrating radar

A technology of ground penetrating radar and railway roadbed, which can be used in electromagnetic wave detection, re-radiation, reflection/re-radiation of radio waves, etc. Effect

Active Publication Date: 2017-01-18
CENT SOUTH UNIV
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Problems solved by technology

The above method extracts the fouling rate of the ballast bed through two-dimensional wavelet analysis and the method of extracting the dielectric constant value, which is easily interfered by random signals
Moreover, in the process of detecting the railway embankment by ground penetrating radar, random interference signals always exist and fluctuate

Method used

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  • Method for inversing railway base track bed contamination rate by using ground penetrating radar
  • Method for inversing railway base track bed contamination rate by using ground penetrating radar
  • Method for inversing railway base track bed contamination rate by using ground penetrating radar

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Embodiment 1

[0040] In this example, the ground penetrating radar collects data along the [32.580 32.065] km interval of the downlink railway line. The ground penetrating radar transmits broadband electromagnetic waves with a fixed pulse repetition frequency and receives scattered echoes. The length of this interval is 515m, the total number of sampling points in the transverse dimension is 10301 points, and the sampling interval between two adjacent mileage points is 5mm. The longitudinal dimension is the time dimension, the total number of sampling points is 512, and the total sampling time is 15ns. For the original radar record profile, see figure 2 , the size of the data is a two-dimensional matrix of 512×10301, and different color scales are used to represent the values ​​of each element of the matrix. The corresponding relationship between colors and values ​​is shown in the color scale column on the right side of the figure. see a certain data image 3 As shown, its length is 512 ...

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Abstract

The invention discloses a method for inversing railway base track bed contamination rate by using a ground penetrating radar. The method includes the following steps that: original data acquired by a vehicle-mounted ground penetrating radar are preprocessed; sectional imaging is performed on the pre-processed data according to track mileage intervals, so that two-dimensional imaging results of each section interval can be obtained; imaging results of a certain set depth interval at mileage points in each section interval are extracted; the energy values of the imaging results of the depth interval are calculated, and are adopted as railway base track bed contamination rates corresponding to the mileage points; and the railway base track bed contamination rates corresponding to the mileage points in each section interval are averaged, and an obtained result is adopted as the estimated value of the railway base track bed contamination rate of the corresponding section interval. The method of the invention has the advantages of high calculation speed and low relative error.

Description

technical field [0001] The invention belongs to the technical field of ground-penetrating radar detection and application, and in particular relates to a method for inverting the pollution rate of railway subgrade and bed by using ground-penetrating radar. Background technique [0002] Ground Penetrating Radar (GPR) is a non-destructive detection instrument that transmits broadband electromagnetic waves to the ground through the transmitting antenna, receives scattered echoes by the receiving antenna, and processes the scattered echoes to realize the detection and parameter inversion of unknown underground areas. When the electromagnetic wave propagates in the underground medium, it will scatter when encountering the interface with electrical difference, and invert the position, shape, burial depth and other parameters of the abnormal body in the unknown underground area according to the received electromagnetic scattering echo, which is widely used in Road engineering, cons...

Claims

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Application Information

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IPC IPC(8): G01S13/89G01V3/12
CPCG01S13/89G01V3/12
Inventor 雷文太梁琼
Owner CENT SOUTH UNIV
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