Multi-passband filtering method of railroad bed disease detection ground penetrating radar signals

Abstract

The invention discloses a multi-passband filtering method of railroad bed disease detection ground penetrating radar signals. The filtering method comprises steps of automatically acquiring roadbed original radar data through a vehicle-mounted roadbed detection radar; extracting radar reflection signals at joints of all scanning channel sleepers so as to form a digital sequence, and obtaining frequency spectrum features of the sleepers and the rail strong reflection interference signals by carrying out frequency spectrum analysis on the digital sequence; designing a multi-passband filter used for inhibiting strong interference of the sleepers and the rails; and using the filter to successively filter the radar signals according to sampling points so as to remove interference signal. According to the invention, by analyzing the strong reflection interference signals of the rails and the sleepers in the railroad bed disease detection ground penetrating radar signals for the first time, sleeper identification device is not required, radar signal acquisition is carried out without avoiding the rails, and the multi-passband filter designed on the basis of strong interference frequency spectrum features of the rails and the sleepers is used for removing strong reflection interference of the sleepers and the rails, the signal to noise ratio of reflection radar signals of the roadbed medium is improved.

Description

technical field [0001] The invention belongs to the field of exploration geophysics data processing, in particular to a multi-passband filtering method for detecting ground-penetrating radar signals of railway embankment diseases. Background technique [0002] The railway is the main artery of the national economy and an important support for economic construction and social development. Railway embankment disease is one of the important factors that threaten the safe operation of railways. With the increase of traffic mileage and service life, traditional roadbed disease detection methods (such as equidistant digging method, light dynamic penetrating method, Rayleigh wave surface wave method, nuclear density instrument method, high-density resistivity method, etc.) have the common characteristics of low efficiency, or damage to existing lines, and cannot provide detailed information on long-distance lines. Ground-penetrating radar technology is a high-resolution, high-effi...

AI Technical Summary

Problems solved by technology

[0009] The purpose of the present invention is to propose a ground penetrating radar signal for railway roadbed disease detection in view of the problem that the radar signal of railway roadbed disease detection is annihilated by the strong reflection interference of rails and sleepers, and the signal-to-noise ratio of the radar signal reflected from railway roadbed disease is low. The unique multi-passband filtering method can effectively suppress various interferences and facilitate roadbed disease identification

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