Rail roadbed settlement measurement method based on mileage and image measurement

Abstract

The invention discloses a rail roadbed settlement measurement method based on mileage and image measurement, and relates to the field of settlement measurement. According to the rail roadbed settlement measurement method, the rail roadbed sparse three-dimensional reconstruction is completed through image feature matching and binocular intersection, the adjacent frame sparse reconstruction point splicing is achieved through a mileage measurement device and feature matching, and therefore automatic monitoring and rapid measurement of rail roadbed settlement are completed. The rail roadbed settlement measurement method has the advantages of being low in cost, high in work efficiency, result repeatability and measurement accuracy, and the like.

Description

technical field [0001] The invention relates to the field of settlement measurement, in particular to a method for measuring railway subgrade settlement based on mileage and image measurement. Background technique [0002] In the modern transportation industry, railways are responsible for important transportation tasks. Since the roadbed is frequently in a state of elastic deformation, long-term accumulation will cause roadbed settlement, and roadbed settlement will make the track uneven. The phenomenon of "jumping" occurs; especially, uneven settlement will cause the train to have a greater additional dynamic effect on the line, aggravate the settlement, accelerate the destruction of the roadbed, cause a vicious cycle of the line, and bring safety hazards to the operation of heavy-duty trains. [0003] The existing subgrade settlement methods mainly include: the method of measuring CPIII points with a total station and the measurement method based on camera, satellite posi...

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Problems solved by technology

[0004] The problems existing in the method of measuring CPIII points with a total station are: low measurement efficiency, when the measurement interval is 2 meters, the processing time of each measurement point is 1 minute, the actual measurement speed is about 150 meters per hour, and the operation efficiency is low , far from meeting the needs of railway subgrade settlement measurement; unable to obtain attitude change parameters such as the current track inclination; only discrete values ​​of railway subgrade settlement at each measurement point can be obtained, and continuous measurement of the entire road section cannot be realized

[0005] The existing problems of the measurement method based on camera, satellite positioning and inertial navigation are: the price is expensive, the inertial navigation device needs to be used for continuous dynamic measurement between two satellite positioning base stations, the price of the satellite positioning base station is relatively high, and the price of the inertial navigation device is also With the improvement of precision requirements, it grows geometrically. Therefore, this type of system is expensive, which is not conducive to large-scale application; the measurement results cannot be repeated, and the measurement process of inertial navigation devices is irreproducible, so it is not conducive to the measurement results. Retrospection after the event; inheritance is poor, the camera measurement sign station did not make full use of the well-built measurement positions along the railway line and the CPⅢ points that related enterprises have produced, so the waste is huge and the promotion cost is high

[0006] To sum up, the existing subgrade settlement measurement methods have disadvantages such as low measurement efficiency, inability to achieve continuous measurement, and high price.

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