Method for eliminating interference during signal detection of railway roadbed radar
A technology for detecting signals and railway subgrades, applied to radio wave measurement systems, instruments, etc., can solve the problems of limited suppression effect, loss of useful signals or recording tracks, complex calculations, etc., achieve obvious effects and avoid loss of recording tracks
Inactive Publication Date: 2012-11-28
CENT SOUTH UNIV
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Problems solved by technology
The first one is complicated to calculate, because the adjacent sleepers interfere with each other, and the suppression effect of independent sleeper interference is limited; the second one, due to the difference between the simulated signal and the measured signal, the radar record after direct subtraction often has a large residual ; The third type loses a large number of useful signals or recording tracks, which reduces the resolution ability of the radar recording profile to a certain extent
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Embodiment 1
[0036] Such as Figure 1 to Figure 8 , figure 2 is a radar record track, the abscissa is the radar response amplitude, and the ordinate is the sampling time point number, the radar detection record profile obtained on the actual railway is the original radar detection record profile and is recorded as the first record profile, image 3 For the radar detection original record profile synthesized by 1328 radar records, it is the radar detection record profile obtained on the actual railway when the radar detection speed is 5m / s (when other speeds, also can adopt the method of the present invention), Judging from the marks on the profile, the interference effects of radar antenna direct coupling waves, rails and sleepers are very prominent on the record profile;
[0037] Figure 4 for the reason image 3 After subtracting the average value of all the recorded tracks from the original records shown, the radar detection record profile that suppresses the direct coupled wave and...
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The invention discloses a method for eliminating interference during signal detection of a railway roadbed radar. The method comprises the following steps of: pressing an antenna direct coupling wave and a rail response interference signal; determining a rail number corresponding to the central position of a sleeper by searching a rail number where a sleeper radar response maximum value is positioned; performing space resampling on a radar recording rail between two adjacent sleepers; acquiring an interference standard rail set having a fixed window width; acquiring a radar recording section from which the direct coupling wave interference, the rail interference and the sleeper interference are eliminated; and performing space back-sampling to form a new radar section for subsequent analysis and processing of a radar signal. By the interference elimination algorithm, the radar antenna direct coupling wave and rail and sleeper response interference waves including multiples can be eliminated at the same time. The algorithm is simple and convenient; diffracted waves and multiples which are produced by the sleepers or the rails can be pressed well; and the method is suitable to be popularized and applied to the signal detection and processing of the railway roadbed radar.
Description
technical field [0001] The invention belongs to the field of optimization processing of railway subgrade radar detection signals, and relates to an interference removal method in railway subgrade radar detection signals. Background technique [0002] Considering the rapid, non-destructive and high-precision requirements of railway subgrade detection, radar detection methods are widely used at home and abroad, and the ability of radar systems to distinguish hidden dangers in subgrades has also been widely recognized at home and abroad. [0003] Rails and sleepers are fixed components along the railway line, and have obvious differences in electrical parameters such as the dielectric constant and surrounding media such as air and ballast. The radar antenna transmits a strong response signal on the sleeper medium, which not only has strong energy, but also has many The emergence of secondary waves seriously affects the post-processing of radar signals and the identification of ...
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IPC IPC(8): G01S7/36
Inventor 朱德兵
Owner CENT SOUTH UNIV