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Train precise positioning method and system based on rail geometrical characteristic information matching

A technology of information matching and geometric features, applied in navigation calculation tools, navigation through velocity/acceleration measurement, etc., can solve the problems of high cost and difficulty in implementation, and achieve the effect of low construction cost, obvious features and rich varieties.

Active Publication Date: 2017-11-28
WUHAN UNIV
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Problems solved by technology

On the other hand, to improve the positioning accuracy from the current meter level to the decimeter level or even the centimeter level, it is extremely difficult and costly to rely on existing technologies

Method used

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  • Train precise positioning method and system based on rail geometrical characteristic information matching
  • Train precise positioning method and system based on rail geometrical characteristic information matching
  • Train precise positioning method and system based on rail geometrical characteristic information matching

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Embodiment Construction

[0059] The existing map matching methods rely on the characteristic signals such as the three-dimensional coordinates of the orbit or the radius of curvature. The characteristic signal on which the matching in the present invention depends is the measured value of the track geometry state parameter, which is also a significant difference between the present invention and the prior art.

[0060] Since the track cannot be staked out or fine-tuned to be absolutely smooth, there is always a certain amount of track deformation and track irregularity. Even the high-speed rail tracks in operation have small deformations, that is, unevenness. See figure 1 As shown, the fine-tuned track has met the smoothness requirements of the high-speed rail, but the actual gauge still has a deviation of about 2mm, which is also the deviation allowed by the technical specifications. Along the mileage direction, the actual gauge fluctuates around the standard gauge. Although the magnitude of the fl...

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Abstract

The invention discloses a train precise positioning method and system based on rail geometrical characteristic information matching. The method comprises the following steps of S1, performing time synchronization on the positioning data and the rail geometrical state parameters; S2, performing inertial navigation resolving according to IMU data; S3, performing melt resolving on the inertial navigation result and the rail mileage data; reckoning the mileage reckoning value; S4, on the basis of the time relevance, giving the mileage reckoning value to the rail geometrical state parameters to obtain a rail geometrical state parameter sequence; S5, performing matching on the rail geometrical state parameter sequence and the preset mileage related rail geometrical state parameter sequence to obtain a matched mileage value; S6, performing combined processing on the mileage reckoning value and the matched mileage value to obtain the optimum mileage estimation value. The rail geometrical state parameter is used as the characteristic signal; the characteristic signal and the preset mileage related rail geometrical state parameter sequence are subjected to relevance matching, so that the decimeter grade or even centimeter grade train positioning precision can be realized.

Description

technical field [0001] The invention belongs to the field of railway train and locomotive positioning, and relates to a precise train positioning method and system based on track geometric feature information matching. Background technique [0002] Train positioning is the basis of operation control and on-board state detection. Its accuracy and reliability are important factors for determining the safety protection distance of trains. It is related to the running interval of trains and affects the efficiency and scheduling of rail transit systems. Accurately determining the position of the train is of great significance to promote the research of train operation control system, optimize the operation efficiency of rail transit, and the development of rail transit system, so the precise positioning technology of train has always been paid attention to. [0003] The positioning of the train is essentially one-dimensional positioning, that is, to determine the milepost where t...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01C21/16G01C21/20
Inventor 陈起金牛小骥张提升周禹昆房博乐刘经南
Owner WUHAN UNIV
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