CN114236536B - Railway roadbed ground penetrating radar data processing system and method thereof - Google Patents

Abstract

The invention discloses a railway subgrade ground penetrating radar data processing system and a method thereof. The system comprises: a data processing module, a mileage correction module, an automatic analysis module, an abnormal area analysis module and a horizon tracking module; the method comprises the following steps: S1. data processing; S2. mileage correction; S3. automatic analysis; S4. abnormal area analysis. The invention can effectively improve the processing speed and accuracy of the data detected by the railway roadbed, and solve the technical problem of low manual interpretation efficiency in the prior art.

Description

A railway subgrade ground penetrating radar data processing system and method

technical field

The invention relates to the technical field of railway subgrade ground penetrating radar, and more particularly to a railway subgrade ground penetrating radar data processing system and method thereof.

Background technique

In the process of rapid detection of railway subgrade ground penetrating radar, due to the large amount of data detected by railway subgrade, which mainly includes 3 survey lines, each 30km is about 26GB, the more mature ground penetrating radar processing software currently on the market cannot meet the data processing requirements. The efficiency of manual interpretation is low, and the level tracking and mileage correction consume a lot of manpower and time.

Therefore, how to provide a railway subgrade ground penetrating radar data processing system and a method thereof is an urgent problem to be solved by those skilled in the art.

SUMMARY OF THE INVENTION

In view of this, the present invention provides a railway subgrade ground penetrating radar data processing system and method thereof, the purpose of which is to improve the processing speed and accuracy of the data detected by the railway subgrade.

In order to achieve the above object, the present invention adopts the following technical solutions:

A railway roadbed ground penetrating radar data processing system, comprising: a data processing module, a mileage correction module, an automatic analysis module, an abnormal area analysis module and a horizon tracking module;

The data processing module is used to determine the appropriate frequency range of band-pass filtering, complete digital filtering and whole-process background filtering, analyze the waveform characteristics of defects, bridge positions and tunnel positions, and send the processed data to the mileage correction. module;

The mileage correction module is used to determine the mileage corresponding to each spectral line according to the processed data, correct the mileage corresponding to each channel in the data through a bridge with a known center position and length, and perform a normalization check, After the normalization check is met, a data file with mileage information is generated, and the positions of bridges and tunnels are marked;

The automatic analysis module is used to select and perform automatic abnormal area analysis on the data under multiple sub-paths, obtain preliminary abnormal area analysis results, and send them to the abnormal area analysis module;

The abnormal area analysis module is used to display the preliminary abnormal area analysis results and the known positions of bridges and tunnels, and provide a method for selecting abnormal areas, so as to perform abnormal data on the left, center and right position measurement points of the track. Area analysis, get the type of abnormal area, the starting spectral line position, cut-off spectral line position, starting depth and cut-off depth of the abnormal area, and obtain the analysis result of the abnormal area.

Preferably, the mileage correction module includes a marked mileage file acquisition unit, a precise mileage positioning unit and a normalization check unit;

The marked mileage file acquisition unit is used to obtain the marked mileage settings recorded in the test process, and obtain the approximate starting mileage and mileage direction;

The precise mileage positioning unit is used to find the spectral line corresponding to the bridge center mileage according to the known bridge center mileage, and complete the precise mileage positioning;

In the equidistant mileage marking mode, accurate mileage correction is carried out according to the spacing of the marking lines and the starting mileage;

Generate a mileage mark file; the mileage mark file contains the identified bridge center mileage, corresponding spectral line position, corresponding bridge length, tunnel center mileage, corresponding spectral line position, corresponding tunnel length, long chain or short chain The starting mileage of the chain, the spectral line position corresponding to the starting mileage, and the corresponding long or short chain length;

According to the mileage mark file, calculate the exact mileage corresponding to each waveform from the original data file;

The normalization checking unit is used to check whether the spectral line spacing and the standard spacing between the bridges are consistent. If they are inconsistent, calculate and display the number of different spectral lines, and allow changing the serial number of the center spectral line corresponding to the bridge.

Preferably, it also includes that the data processing module includes a preprocessing unit, a corrected data processing unit and a data backup unit;

The preprocessing unit is used to check whether the data lengths of the three measuring points of the same road section are consistent, align the data lengths when they are inconsistent, and preprocess the data before the mileage correction;

The corrected data processing unit is used to perform time domain or frequency domain analysis on a certain waveform, a continuous multi-channel waveform or an average curve of the continuous multi-channel waveform, and process the data;

Among them, the processing data includes: compressing or expanding the sampled data, evenly sampling or averaging the waveform data; setting the data of the specified channel to zero; performing digital filtering and whole-process background filtering; performing integral or differential transformation according to the settings; or the characteristics of the bridge tunnel waveform;

The data backup unit is used for saving the data processed by the preprocessing unit and the corrected data processing unit, and backing up the original data.

Preferably, the automatic analysis module includes a path selection unit, a parameter selection unit and an automatic abnormal area analysis unit;

The path selection unit is used for selecting and modifying data under multiple sub-paths;

The parameter selection unit is used to select the depth range of automatic analysis in the parameter column;

The automatic abnormal area analysis unit is used for preliminary automatic analysis of defects, and sends the preliminary abnormal area analysis result to the abnormal area analysis module.

Preferably, the abnormal area analysis module includes an abnormal area positioning unit, a defect property selection unit, a defect analysis unit, a gain adjustment unit and a result output unit;

The abnormal area locating unit is used to determine the upper, lower, left, and right boundaries of the abnormal area, and locate the abnormal area;

The defect property selection unit is used for selecting the defect properties of the determined abnormal area, and supplementing the defect properties through remarks when supplementation is required;

The defect analysis unit is used to select measuring points at different positions for defect analysis, and obtain data corresponding to the defect;

The gain adjustment unit is used to select a gain method and perform gain adjustment according to the gain method, wherein the starting depth, the cut-off depth, the target depth, and the target gain are set, local gain adjustment is performed, and the local gain and the original global gain are multiplied to realize the global gain. gain adjustment;

The result output unit is used for exporting tables and outputting analysis reports.

Preferably, the table derived by the result output unit includes an uplink defect list, a downlink defect list and defect properties;

The output analysis report is divided into single-channel display and multi-channel display:

The output analysis report of the single-channel display includes the defect data table of the current channel measurement point and all abnormal area bitmaps;

The output analysis report of the multi-channel display includes: unified integration of multi-channel defects, when two or more defects overlap locally, unified starting and ending mileage, unified starting depth and ending depth, and pressing a defect. Output the defect data table and abnormal area bitmap, and indicate the channel corresponding to the defect in the defect data table and abnormal area bitmap.

Preferably, it also includes a horizon tracking module, and the horizon tracking module includes a layer number determination unit and an automatic layering unit;

The layer number determining unit is used to select the layer number that needs to be determined currently;

The automatic stratification unit is used for automatically stratifying the orbit ground-based data according to the input starting depth and cut-off depth according to the determined number of layers.

A railway subgrade ground penetrating radar data processing method, comprising the following steps:

S1. Data processing; determine the appropriate frequency range of band-pass filtering, complete digital filtering and whole-process background filtering, and analyze the characteristics of waveforms at defects, bridge positions and tunnel positions;

S2. Mileage correction: According to the processed data, determine the mileage corresponding to each spectral line, correct the mileage corresponding to each channel in the data through the bridge with known center position and length, and perform a normalization check to meet the normalization After inspection, a data file with mileage information is generated, and the locations of bridges and tunnels are marked;

S3. Automatic analysis; choose to perform automatic abnormal area analysis on the data under multiple sub-paths to obtain preliminary abnormal area analysis results;

S4. Abnormal area analysis; combined with the preliminary abnormal area analysis results, skip bridges and tunnels according to the known positions of bridges and tunnels, and perform abnormal area analysis on the data of the left, center and right positions of the track to obtain abnormal areas. type, the starting spectral line position, cutoff spectral line position, starting depth and cutoff depth of the abnormal area to obtain the analysis result of the abnormal area.

As can be seen from the above technical solutions, compared with the prior art, the present invention provides a railway roadbed ground penetrating radar data processing system and method thereof, including the following beneficial effects:

The present invention can further perform mileage correction by analyzing the geological radar measurement data in the original file format, thereby further completing the processing of the ground penetrating radar data;

Some spectrum lines can be marked, and the corresponding mileage can be set for the marked spectrum lines, thereby judging whether the change of the mileage is increasing or decreasing, and preliminarily calculate the starting mileage. Supports the identification method of mileage and equal intervals. For the identification method with equal intervals of mileage, the difference between the spectral lines of the file after mileage correction is equal, and the difference distance is obtained according to the setting.

The mileage can be calibrated according to the center mileage and bridge length of the bridge, and the mileage calibration supports long-chain and short-chain identification. The mileage correction result can be normalized and checked to determine whether the mileage correction result is reasonable. When there is no known bridge information, the location of the bridge can still be marked, but the bridge location is not used for mileage correction at this time. After mileage calibration, the location of bridges and tunnels can be marked during analysis, and bridges and tunnels can be skipped during analysis of abnormal areas.

It can easily identify abnormal disease areas, derive relevant information about disease abnormalities, and achieve rapid processing and interpretation of GPR data.

It can perform automatic and semi-automatic layer tracking, and output layered tables according to the set interval. According to the set different wave speed of each layer, the exact depth of each layer under each section is calculated.

It can copy images, save bitmaps, save tables, and automatically output the whole analysis report.

Detailed ways

The technical solutions in the embodiments of the present invention will be described clearly and completely below. Obviously, the described embodiments are only a part of the embodiments of the present invention, rather than all the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those of ordinary skill in the art without creative efforts shall fall within the protection scope of the present invention.

The embodiment of the invention discloses a railway subgrade ground penetrating radar data processing system, comprising: a data processing module, a mileage correction module, an automatic analysis module, an abnormal area analysis module and a horizon tracking module;

The data processing module is used to determine the appropriate frequency range of band-pass filtering, complete digital filtering and full background filtering, analyze the waveform characteristics of defects, bridge positions and tunnel positions, and send the processed data to the mileage correction module;

The mileage correction module is used to determine the mileage corresponding to each spectral line according to the processed data, correct the mileage corresponding to each channel in the data through the bridge with the known center position and length, and perform a normalization check to meet the normalization requirements. A data file with mileage information is generated after inspection, and the location of bridges and tunnels is marked;

The automatic analysis module is used to select and perform automatic abnormal area analysis on the data under multiple sub-paths, obtain preliminary abnormal area analysis results, and send them to the abnormal area analysis module;

The abnormal area analysis module is used to display the preliminary abnormal area analysis results and the known positions of bridges and tunnels, and provide a way to select the abnormal area, so as to perform abnormal area analysis on the data of the left, center and right position measuring points of the track , get the type of the abnormal area, the starting spectral line position, cut-off spectral line position, starting depth and cut-off depth of the abnormal area, and obtain the analysis result of the abnormal area.

It should be noted:

The automatic analysis module in this embodiment obtains preliminary abnormal area analysis results by automatically performing abnormal analysis on the data under multiple sub-paths by the system itself, while the abnormal area analysis module provides a platform for users to select abnormal areas and realizes semi-automatic manual The analysis, combined with the preliminary abnormal area analysis results, finally obtains the complete content of the abnormal area analysis.

In order to further implement the above technical solution, the mileage correction module includes a marked mileage file acquisition unit, a precise mileage positioning unit and a normalization check unit;

The marked mileage file acquisition unit is used to obtain the marked mileage settings recorded in the test process, and obtain the approximate starting mileage and mileage direction;

The precise mileage positioning unit is used to find the spectral line corresponding to the center mileage of the bridge according to the known center mileage of the bridge, and complete the precise mileage positioning;

In the equidistant mileage marking mode, accurate mileage correction is carried out according to the spacing of the marking lines and the starting mileage;

Generate a mileage mark file; the mileage mark file contains the center mileage of the identified bridge, the corresponding spectral line position, the corresponding bridge length, the central mileage of the tunnel, the corresponding spectral line position, the corresponding tunnel length, and the length of the long or short chain. The starting mileage, the spectral line position corresponding to the starting mileage, and the corresponding long or short chain length;

According to the mileage mark file, calculate the exact mileage corresponding to each waveform from the original data file;

The normalization check unit is used to check whether the spectral line spacing and the standard spacing between each bridge are consistent. If they are inconsistent, the number of the difference spectral lines is calculated and displayed, and the serial number of the corresponding central spectral line of the bridge is allowed to be changed.

It should be noted:

The mileage mark file contains the center mileage of the identified bridge (this data is immutable and obtained from the ledger table file), the corresponding spectral line position (identified by the software), the corresponding bridge length (identified by the software, which is actually a track guard length); the central mileage of the tunnel (this data is immutable, obtained from the ledger table file), the corresponding spectral line position (calculated from the bridge center spectral line), the corresponding tunnel length (this data is immutable, obtained from the ledger table file); the starting mileage of the long chain or short chain (this data is immutable and obtained from the ledger table file), the spectral line position corresponding to the starting mileage (calculated from the bridge center spectral line), the corresponding long chain or The length of the short chain (this data is immutable and obtained from the ledger table file).

The new file after mileage correction will be saved at equal intervals, and the corrected mileage will be recorded for each data.

If mileage correction is not required, manually input the starting mileage in the preprocessing unit, determine the direction of mileage change, and then perform other processing.

In order to further implement the above technical solution, it also includes that the data processing module includes a preprocessing unit, a corrected data processing unit and a data backup unit;

The preprocessing unit is used to check whether the data lengths of the three measuring points on the same road section are consistent, if they are inconsistent, align the data lengths, and preprocess the data before mileage correction;

The corrected data processing unit is used to perform time domain or frequency domain analysis on a certain waveform, continuous multi-channel waveform or average curve of continuous multi-channel waveform, and process the data;

Among them, the processing data includes: compressing or expanding the sampled data, evenly sampling or averaging the waveform data; setting the data of the specified channel to zero; performing digital filtering and whole-process background filtering; performing integral or differential transformation according to the settings; or the characteristics of the bridge tunnel waveform;

The data backup unit is used for saving the data processed by the preprocessing unit and the corrected data processing unit, and backing up the original data.

It should be noted:

If a road segment has multiple measurement points and the data lengths are inconsistent, preprocessing must be performed. Preprocessing can ensure that the data lengths of multiple measuring points are consistent. Preprocessing can compress the waveform, compress or expand the data of each section, zero the data of some sections, perform background filtering, bandpass filtering, and data conditioning (integration or differentiation). The preprocessing module only performs the background filtering of the whole process, but not the background filtering of the local sliding, which is to take into account the abnormal area analysis and the hierarchical analysis at the same time. The preprocessed file eliminates the need for digital filtering of the data when analyzing abnormal areas, which can speed up the analysis.

In order to further implement the above technical solution, the automatic analysis module includes a path selection unit, a parameter selection unit and an automatic abnormal area analysis unit;

The path selection unit is used to select and change the data under multiple sub-paths;

The parameter selection unit is used to select the depth range of automatic analysis in the parameter column;

The automatic abnormal area analysis unit is used for preliminary automatic analysis of defects, and sends the preliminary abnormal area analysis results to the abnormal area analysis module.

It should be noted:

The automatic analysis module can choose to perform mileage correction on the data under multiple sub-paths, perform data preprocessing in batches according to the set parameters, and automatically perform abnormal area analysis. Whether to set automatic mileage correction, preprocessing and abnormal area analysis. The automatic abnormal area analysis can obtain the preliminary analysis results, and when the abnormal area analysis is performed, the analysis speed can be improved.

In order to further implement the above technical solution, the abnormal area analysis module includes an abnormal area positioning unit, a defect property selection unit, a defect analysis unit, a gain adjustment unit and a result output unit;

The abnormal area positioning unit is used to determine the upper, lower, left, and right boundaries of the abnormal area, and locate the abnormal area;

The defect nature selection unit is used to select the defect nature of the determined abnormal area, and to supplement the defect nature through remarks if it needs to be supplemented;

The defect analysis unit is used to select measuring points at different positions for defect analysis, and obtain the corresponding data of the defect;

The gain adjustment unit is used to select the gain method and adjust the gain according to the gain method, in which the starting depth, cut-off depth, target depth, and target gain are set, local gain adjustment is performed, and the local gain and the original global gain are multiplied to realize the global gain adjustment. ;

The result output unit is used to export tables and output analysis reports.

It should be noted:

The result output unit can integrate the analysis results of different mileage intervals under multiple sub-paths into one analysis report during actual use.

In order to further implement the above technical solution, the table derived by the result output unit includes an uplink defect list, a downlink defect list and defect properties;

The output analysis report is divided into single-channel display and multi-channel display:

The output analysis report of the single-channel display includes the defect data table of the current channel measurement point and the bitmap of all abnormal areas;

The output analysis report of multi-channel display includes: unified integration of multi-channel defects, when two or more defects overlap locally, unified start and end mileage, unified start depth and end depth, and output defects by one defect Data table and abnormal area bitmap, and indicate the channel corresponding to the defect in the defect data table and abnormal area bitmap.

In order to further implement the above technical solution, a horizon tracking module is also included, and the horizon tracking module includes a layer number determination unit and an automatic layering unit.

The layer number determination unit is used to select the layer number that needs to be determined at present;

The automatic stratification unit is used to complete the automatic stratification of the orbit ground-based data according to the input starting depth and cut-off depth according to the determined number of layers.

It should be noted:

The layered results are output in the form of a table according to the set interval.

A railway subgrade ground penetrating radar data processing method, comprising the following steps:

S1. Data processing module; determine the appropriate frequency range of band-pass filtering, complete digital filtering and whole-process background filtering, and analyze the waveform characteristics of defects, bridge positions and tunnel positions;

S2. Mileage correction module: According to the processed data, determine the mileage corresponding to each spectral line, correct the mileage corresponding to each channel in the data through the bridge with known center position and length, and perform a normalization check to meet the normalization requirements. A data file with mileage information is generated after inspection, and the location of bridges and tunnels is marked;

S3. Automatic analysis; choose to perform automatic abnormal area analysis on the data under multiple sub-paths to obtain preliminary abnormal area analysis results;

S4. Abnormal area analysis; combined with the preliminary abnormal area analysis results, skip bridges and tunnels according to the known positions of bridges and tunnels, and perform abnormal area analysis on the data of the left, center and right positions of the track to obtain abnormal areas. type, the starting spectral line position, cutoff spectral line position, starting depth and cutoff depth of the abnormal area to obtain the analysis result of the abnormal area.

The various embodiments in this specification are described in a progressive manner, and each embodiment focuses on the differences from other embodiments, and the same and similar parts between the various embodiments can be referred to each other. As for the device disclosed in the embodiment, since it corresponds to the method disclosed in the embodiment, the description is relatively simple, and the relevant part can be referred to the description of the method.

The above description of the disclosed embodiments enables any person skilled in the art to make or use the present invention. Various modifications to these embodiments will be readily apparent to those skilled in the art, and the generic principles defined herein may be implemented in other embodiments without departing from the spirit or scope of the invention. Thus, the present invention is not intended to be limited to the embodiments shown herein, but is to be accorded the widest scope consistent with the principles and novel features disclosed herein.

Claims (7)

1. a railway roadbed ground penetrating radar data processing system, is characterized in that, comprises: data processing module, mileage correction module, automatic analysis module, abnormal area analysis module and horizon tracking module; The data processing module is used to determine the appropriate frequency range of band-pass filtering, complete digital filtering and whole-process background filtering, analyze the waveform characteristics of defects, bridge positions and tunnel positions, and send the processed data to the mileage correction. module; The mileage correction module is used to determine the mileage corresponding to each spectral line according to the processed data, correct the mileage corresponding to each channel in the data through a bridge with a known center position and length, and perform a normalization check, After the normalization check is met, a data file with mileage information is generated, and the positions of bridges and tunnels are marked; The automatic analysis module is used to select and perform automatic abnormal area analysis on the data under multiple sub-paths, obtain preliminary abnormal area analysis results, and send them to the abnormal area analysis module; The abnormal area analysis module is used to display the preliminary abnormal area analysis results and the known positions of bridges and tunnels, and provide a method for selecting abnormal areas, so as to perform abnormal data on the left, center and right position measurement points of the track. Area analysis, obtain the type of abnormal area, the starting spectral line position, cutoff spectral line position, starting depth and cutoff depth of the abnormal area, and obtain the analysis result of the abnormal area; The mileage correction module includes a marked mileage file acquisition unit, a precise mileage positioning unit and a normalization check unit; The marked mileage file acquisition unit is used to obtain the marked mileage settings recorded in the test process, and obtain the approximate starting mileage and mileage direction; The precise mileage positioning unit is used to find the spectral line corresponding to the bridge center mileage according to the known bridge center mileage, and complete the precise mileage positioning; In the equidistant mileage marking mode, accurate mileage correction is carried out according to the spacing of the marking lines and the starting mileage; Generate a mileage mark file; the mileage mark file contains the identified bridge center mileage, the corresponding spectral line position, the corresponding bridge length, the tunnel center mileage, the corresponding tunnel length, the starting mileage of the long or short chain, The spectral line position corresponding to the starting mileage and the corresponding long or short chain length; According to the mileage mark file, calculate the exact mileage corresponding to each waveform from the original data file; The normalization checking unit is used to check whether the spectral line spacing and the standard spacing between the bridges are consistent. If they are inconsistent, calculate and display the number of different spectral lines, and allow changing the serial number of the center spectral line corresponding to the bridge. 2. A railway roadbed ground penetrating radar data processing system according to claim 1, wherein the data processing module comprises a preprocessing unit, a corrected data processing unit and a data backup unit; The preprocessing unit is used to check whether the data lengths of the three measuring points of the same road section are consistent, align the data lengths when they are inconsistent, and preprocess the data before the mileage correction; The corrected data processing unit is used to perform time domain or frequency domain analysis on a certain waveform, a continuous multi-channel waveform or an average curve of the continuous multi-channel waveform, and process the data; Among them, the processing data includes: compressing or expanding the sampled data, evenly selecting or averaging the waveform data; setting the data of the specified channel to zero; performing digital filtering and full background filtering; performing integral or differential transformation according to the settings; or the characteristics of the bridge tunnel waveform; The data backup unit is used for saving the data processed by the preprocessing unit and the corrected data processing unit, and backing up the original data. 3. A railway roadbed ground penetrating radar data processing system according to claim 1, wherein the automatic analysis module comprises a path selection unit, a parameter selection unit and an automatic abnormal area analysis unit; The path selection unit is used for selecting and modifying data under multiple sub-paths; The parameter selection unit is used to select the depth range of automatic analysis in the parameter column; The automatic abnormal area analysis unit is used for preliminary automatic analysis of defects, and sends the preliminary abnormal area analysis result to the abnormal area analysis module. 4. A railway subgrade ground penetrating radar data processing system according to claim 1, wherein the abnormal area analysis module comprises an abnormal area positioning unit, a defect property selection unit, a defect analysis unit, a gain adjustment unit and a result output unit; The abnormal area locating unit is used to determine the upper, lower, left, and right boundaries of the abnormal area, and locate the abnormal area; The defect property selection unit is used for selecting the defect properties of the determined abnormal area, and supplementing the defect properties through remarks when supplementation is required; The defect analysis unit is used to select measuring points at different positions for defect analysis, and obtain data corresponding to the defect; The gain adjustment unit is used to select a gain method and perform gain adjustment according to the gain method, wherein the starting depth, the cut-off depth, the target depth, and the target gain are set, local gain adjustment is performed, and the local gain and the original global gain are multiplied to realize the global gain. gain adjustment; The result output unit is used for exporting tables and outputting analysis reports. 5. A kind of railway subgrade ground penetrating radar data processing system according to claim 4, is characterized in that, The table exported by the result output unit includes an uplink defect list, a downlink defect list and defect properties; The output analysis report is divided into single-channel display and multi-channel display: The output analysis report of the single-channel display includes the defect data table of the current channel measurement point and all abnormal area bitmaps; The output analysis report of the multi-channel display includes: unified integration of multi-channel defects, when two or more defects overlap locally, unified start and end mileage, unified start depth and end depth, and press a defect. Output the defect data table and abnormal area bitmap, and indicate the channel corresponding to the defect in the defect data table and abnormal area bitmap. 6. A railway roadbed ground penetrating radar data processing system according to claim 1, wherein the horizon tracking module comprises a layer number determination unit and an automatic layering unit; The layer number determining unit is used to select the layer number that needs to be determined currently; The automatic layering unit is used for automatically layering the orbit ground-based data according to the determined layer number and the input starting depth and cut-off depth. 7. A railway subgrade ground penetrating radar data processing method, based on a railway subgrade ground penetrating radar data processing system described in any one of claims 1-6, characterized in that, comprising the following steps: S1. Data processing; determine the appropriate frequency range of band-pass filtering, complete digital filtering and whole-process background filtering, and analyze the characteristics of waveforms at defects, bridge positions and tunnel positions; S2. Mileage correction: According to the processed data, determine the mileage corresponding to each spectral line, correct the mileage corresponding to each channel in the data through the bridge with known center position and length, and perform a normalization check to meet the normalization After inspection, a data file with mileage information is generated, and the locations of bridges and tunnels are marked; S3. Automatic analysis; choose to perform automatic abnormal area analysis on the data under multiple sub-paths to obtain preliminary abnormal area analysis results; S4. Abnormal area analysis: Combined with the preliminary abnormal area analysis results, skip bridges and tunnels according to the known positions of bridges and tunnels, and perform abnormal area analysis on the data of the left, center and right positions of the track to obtain abnormal areas. type, the starting spectral line position, cutoff spectral line position, starting depth and cutoff depth of the abnormal area to obtain the analysis result of the abnormal area.