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Estimation method for train running state parameter based on time-frequency map processing of optical fiber sensing

A technology of operating status and optical fiber sensing, applied in image data processing, computing, image analysis, etc., can solve problems such as limited number of monitoring points, large environmental impact, complex system, etc.

Inactive Publication Date: 2018-11-23
UNIV OF ELECTRONICS SCI & TECH OF CHINA
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0004] The purpose of the present invention is to solve the problem that the real-time on-line monitoring method system of the current train running state is relatively complicated, and is greatly affected by the environment and local point-type monitoring. The problem of real-time monitoring of train running status is proposed, which can well adapt to the characteristics of long railway distance and large transportation volume. The installation and maintenance are simpler and more convenient than the traditional train running status perception method based on electrical sensors, and can realize long-distance and large-scale , Continuous spatio-temporal online monitoring and parameter estimation of train running status in strong noise environment

Method used

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  • Estimation method for train running state parameter based on time-frequency map processing of optical fiber sensing
  • Estimation method for train running state parameter based on time-frequency map processing of optical fiber sensing
  • Estimation method for train running state parameter based on time-frequency map processing of optical fiber sensing

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Embodiment 1

[0065] As a first embodiment, a phase-sensitive optical time-domain reflectometer is used to collect spatio-temporal vibration signals. like figure 1 As shown, one of the spare cores of the ordinary communication optical cable buried along the train track is connected to a phase-sensitive optical time domain reflectometer (Φ-OTDR). Partial composition. The detection optical cable is a single-mode optical fiber for ordinary communication. The optical cable is generally buried along the urban track, parallel to the track or at any angle (except 90°), and senses the ground vibration caused by passing trains on the track to realize the detection of trains near the optical cable. Online monitoring of track safety. Optical signal demodulation equipment is the core of the system. Its internal components mainly include optical devices and electrical devices. An ultra-narrow linewidth laser generates a continuous coherent optical signal, which is modulated into an optical pulse signa...

Embodiment 2

[0067] As the second embodiment, based on the method for estimating the parameters of the train running state based on optical fiber sensing time-frequency image processing, the phase of the pulsed light is demodulated by detecting the change of the interference fringe of Rayleigh scattered light at different times, that is, the optical time domain reflection track (OTDR track). Changes in the train, so as to perceive and locate the vibration caused by the train running, and obtain the time-frequency spectrum of each position from its vibration space-time response graph, and estimate the running state parameters such as the speed, direction and position of the train that generates the vibration signal in real time. Method flow chart as figure 2 As shown, the method steps are:

[0068] Step (1), the signal is collected in real time through the optical fiber buried along the train track, and the space-time vibration signal of the train running process along the track is obtaine...

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Abstract

The invention discloses an estimation method for train running state parameters based on time-frequency map processing of optical fiber sensing which comprises the following steps of: acquiring signals in real time through an optical fiber buried in the train track to acquire a time-space vibration signal of the running process of the train along the track; acquiring a time-frequency map of an observation time window signal when the train passes through each spatial position based on the acquired time-space vibration signals; performing NLM nonlinear de-noising on the time-frequency map to acquire a de-noised time-frequency map; performing image processing on the de-noised time-frequency map to obtain a train outline image; and extracting the basic outline and boundary parameters of the train based on the train outline image, and calculating train running state parameters according to the basic outline and boundary parameters estimated at different positions. According to the estimation method for train running state parameters based on time-frequency map processing of optical fiber sensing, the online detection and estimation of continuous time-space of train running states in long distance, large range and strong noise background are solved.

Description

technical field [0001] The invention belongs to the field of intelligent rail transit, and in particular relates to a method for estimating train operating state parameters based on optical fiber sensing time-frequency diagram processing. Background technique [0002] In railway transportation, the dispatching command based on the real-time running status of the train shoulders the important responsibility of organizing passenger and cargo transportation, ensuring key transportation and production safety, and improving the quality of transportation services. Reasonable train dispatching and correct command are important ways to ensure traffic safety, and real-time online monitoring of train running status is the premise for realizing reasonable dispatching and correct command. At present, the mainstream method is based on the global satellite positioning system GNSS fusion of multiple types of sensor data for train positioning and real-time status monitoring. For example, F...

Claims

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Application Information

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IPC IPC(8): G06K9/00G06T7/13G06T7/136G06T7/70G01H9/00
CPCG06T7/13G06T7/136G06T7/70G01H9/004G06F2218/02G06F2218/08
Inventor 吴慧娟王梦娇陈忠权陈吉平郑义饶云江
Owner UNIV OF ELECTRONICS SCI & TECH OF CHINA
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