Ground penetrating radar echo signal de-noising algorithm based on automatic anti-phase correction and peak value comparison
A ground penetrating radar, echo signal technology, applied in electromagnetic wave detection, radio wave measurement systems, instruments, etc., can solve the problems of signal phase uncertainty, low efficiency, etc., to avoid phase uncertainty, improve calculation efficiency and eliminate The effect of the noise effect
Active Publication Date: 2017-09-01
CENT SOUTH UNIV
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In the above processing methods, the denoising algorithm based on ICA has the problem of signal phase uncertainty, while the denoising algorithm based on CEEMD needs to distinguish each IMF component by manual interpretation, and then reconstruct the signal, which is inefficient
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[0030] The present invention will be described in further detail below in conjunction with the accompanying drawings and specific embodiments.
[0031] GPR forward modeling such as figure 2 As shown, the underground medium has three layers, the thickness of the first and second layers is 15cm, the relative permittivity of the first, second and third layers are 20, 10 and 15 respectively, a metal pipe with a radius of 4cm is buried in the second layer, The center of the metal pipe is 6cm away from the upper surface of the second layer, and the transmitting and receiving antennas are located directly above the center of the metal pipe, with a height of 5cm from the ground surface. The transmitted signal is a Ricker wavelet with a center frequency of 900 MHz, and the time window is set to 40 ns. The scattered echo of the underground area received by the receiving antenna is simulated by using the finite difference time domain method, as shown in image 3As shown, the duration i...
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The invention discloses a ground penetrating radar echo signal de-noising algorithm based on automatic anti-phase correction and peak value comparison. The method comprises steps that random fitting of a ground penetrating original echo signal and a zero mean value white noise signal having identical length is carried out to acquire two paths of signals; an independent composition analysis algorithm is utilized to carry out separation of the two paths of signals, the signal with a relatively large output peak value is marked as x'(m), and the signal with a relatively small output peak value is marked as n'(m); automatic anti-phase correction for the x'(m) is carried out, a complete total experience modal algorithm is utilized to decompose the signal after anti-phase correction to acquire P signal components, and a peak value of each signal component is calculated; a peak value of the n'(m) is calculated and is taken as a threshold; all the signal components of which peak values are greater than the threshold are accumulated and are taken as a signal of the original echo signal after de-noising. The method is advantaged in that calculation efficiency and the de-noising effect are improved.
Description
technical field [0001] The invention belongs to the technical field of ground penetrating radar detection and application, and in particular relates to denoising processing of ground penetrating radar echo signals. Background technique [0002] Ground Penetrating Radar (GPR) transmits broadband electromagnetic waves to the ground through the transmitting antenna, and the receiving antenna receives the scattered echoes. By processing the scattered echoes, non-destructive detection and parameter inversion are performed on unknown underground areas. When the electromagnetic wave propagates in the underground medium, it will scatter when it encounters an interface with electrical differences, and invert parameters such as the location, shape, and burial depth of anomalous bodies in unknown underground areas based on the received electromagnetic scattering echoes. As an important tool for detecting underground targets, GPR detects signs of life underground in humanitarian rescue,...
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Login to View More IPC IPC(8): G01V3/12G01S7/292
CPCG01S7/292G01V3/12
Inventor 雷文太梁琼施荣华
Owner CENT SOUTH UNIV