High-accuracy train positioning system based on radio frequency technology and positioning method thereof

Abstract

The invention provides a high-accuracy train positioning system based on the radio frequency technology and a positioning method thereof. The high-accuracy train positioning system comprises a radio frequency card arranged on a trackside fixed object and a reader and a processing computer which are arranged on a rail train, wherein the radio frequency card responds to a transmitting signal sent by the reader and returns a reflected signal; the reader receives and processes the reflected signal returned by the radio frequency card to acquire the card number of the radio frequency card and sends the card number to the processing computer; and the processing computer invokes the database of the radio frequency card to identify the positioning information corresponding to the card number of the radio frequency card. The train positioning system and the positioning method carry forward various advantages of the radio frequency technology, overcome the defects of the prior art and can operate accurately and effectively in severe environment. In addition, the invention also provides an error correction scheme for the positioning system, which further increases the detection accuracy of the train positioning system and meets the high requirements of current rail transit development for the detection system.

Description

technical field [0001] The invention relates to the technical field of rail transit facility detection, in particular to a radio frequency technology-based high-precision train positioning system and a positioning method thereof. Background technique [0002] The track inspection vehicle is a large-scale dynamic testing equipment for checking track defects, eliminating hidden dangers of accidents, guiding line maintenance, improving track smoothness, and ensuring driving safety. It is mainly used in rail transit fields such as trains, subways, and trams. The track detection system installed on the track inspection vehicle can dynamically detect the geometric parameters of the track, and the detection data and overruns play a very important role in guiding road maintenance and maintenance in public works sections and ensuring driving safety. The overrun data detected by the track inspection vehicle needs to be marked with mileage, so that the engineering section can accurate...

AI Technical Summary

Problems solved by technology

[0005] The disadvantage of this manual mileage setting method is that it increases the workload of the inspectors and makes the inspection task more onerous; the operator may input the mileage incorrectly when correcting, resulting in system mileage errors; sooner or later, different people press the correction key. The difference increases the system error; the detection is restricted by the environment, and the mileage sign cannot be corrected manually in an environment with poor visual distance at night; the train speed is too fast, which may also cause the mileage sign to be unable to be seen manually, resulting in the inability to perform mileage correction fix

[0007] The shortcoming of this kind of photoelectric encoder detection method is: the long-term operation of the train, the wear and tear of the wheel itself will cause the circumference to become smaller, and the distance represented by each pulse will become smaller, resulting in errors in the detection data; when the train brakes and other actions, the wheel It will slip, and the axle will not drive the photoelectric encoder to rotate, which will cause detection errors; due to reasons such as on-site construction and line changes, the long chain, short chain or connecting line of the line will have a mileage jump, which will cause the detection system. Discrepancy between calculated mileage and actual mileage on the line

[0009] The disadvantage of the GPS mileage calibration method is that: the GPS receiver is greatly affected by the railway environment, and the GPS mileage calibration system will not work in tunnels, valleys or even bridges that block satellite signal reception; the positioning error of the GPS system is relatively large. On the line, it can reach 5 meters. With the increase of train speed, the positioning error of GPS system will further increase, which cannot meet the requirements of dynamic detection of train detection accuracy.

[0010] In summary, in view of the various problems existing in the mileage positioning technology of various track inspection vehicles, it cannot fully meet the needs of actual track train mileage detection.

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