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A railway 25hz phase-sensitive track signal detection method and system based on channel multiplexing

A technology of track signals and detection methods, applied in the field of detection, can solve problems such as inapplicability

Active Publication Date: 2021-08-17
MIANYANG WEIBO ELECTRONICS
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

But when there is a vehicle passing by on the phase-sensitive track, the track voltage and the local voltage amplitude suddenly change. At this time, the quasi-synchronous phase difference method fails, and the existing phase-sensitive track signal detection technology is not suitable for the situation where there is a vehicle passing on the phase-sensitive track.

Method used

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  • A railway 25hz phase-sensitive track signal detection method and system based on channel multiplexing
  • A railway 25hz phase-sensitive track signal detection method and system based on channel multiplexing
  • A railway 25hz phase-sensitive track signal detection method and system based on channel multiplexing

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Effect test

Embodiment 1

[0027] Such as figure 1 As shown, a kind of railway 25Hz phase-sensitive track signal detection method based on channel multiplexing provided by the present invention, the specific steps include:

[0028] S1. Obtain the information of whether there is a vehicle passing by the 25Hz phase-sensitive track circuit;

[0029] S2. Obtain a 25Hz phase-sensitive track signal, the 25Hz phase-sensitive track signal includes a local voltage signal and a track voltage signal;

[0030] S3. Using N periodic signal waveforms of the local voltage signal and the track voltage signal, respectively estimate and obtain predicted frequencies of the local voltage signal and the track voltage signal;

[0031] S4. When the 25Hz phase-sensitive track circuit has no vehicles passing by, first use the predicted frequency and adopt the quasi-synchronous phase difference iteration method to iterate successively to obtain the actual frequencies of the local voltage signal and the track voltage signal, and ...

Embodiment 2

[0036] Such as figure 2 As shown, this embodiment is an improvement on the existing technology. When no vehicle passes by, the estimated frequency is used, and the quasi-synchronous phase difference iteration method is used to obtain the actual frequency f1' of the local voltage signal and the track The actual frequency f2' of the voltage signal can finally approach the actual frequency.

[0037] When the phase-sensitive track circuit passes a vehicle, the track coil and the local voltage amplitude suddenly change. At this time, the quasi-synchronous phase difference method fails, and the signal phase is obtained by performing a sliding short-time Fourier transform with the predicted frequency as the center frequency.

Embodiment 3

[0039] Such as image 3 As shown, a kind of railway 25Hz phase-sensitive track signal detection system based on channel multiplexing provided by the present invention includes a signal acquirer, a budgeted frequency estimator, an actual frequency calculator, a phase calculator, and a phase difference calculator, and is characterized in that , the detection system also includes a passing calculator, which is used to use the predicted frequency as the center frequency to perform sliding short-time Fourier transform to obtain the real-time frequency and real-time phase of the local voltage signal and the track voltage signal.

[0040] This embodiment is specifically: a signal acquirer, configured to acquire a local voltage signal and a track voltage signal. The predicted frequency estimator is used to estimate the predicted frequency f1 of the local voltage signal and the predicted frequency f2 of the track voltage signal by using N periodic signal waveforms of the local voltage ...

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Abstract

The invention discloses a method and system for detecting railway 25Hz phase-sensitive track signals based on channel multiplexing. The method obtains reliable and accurate railway 25Hz phase-sensitive track signals when no vehicles pass by, and also according to local voltage signals and track signals. The current waveform of the voltage signal is added with a 10ms Hanning window, and the sliding short-time Fourier transform is performed to obtain the real-time frequency and real-time phase of the local voltage signal and the track voltage signal, so that the 25Hz phase-sensitive track signal can be obtained even when there is a car passing by The real-time frequency and real-time phase of the system, the system includes a signal acquirer, a budgeted frequency estimator, an actual frequency calculator, a phase calculator, a phase difference calculator, and a passing calculator.

Description

technical field [0001] The invention relates to a detection method and system, in particular to a method and system for detecting railway 25Hz phase-sensitive track signals based on channel multiplexing. Background technique [0002] Today, the 25Hz phase-sensitive track circuit, as the basic equipment for the automatic control of railway signals, is one of the key signal equipment to ensure the safety of railway traffic. It is usually necessary to detect the phase-sensitive characteristics of the 25Hz phase-sensitive track circuit to rule out track abnormalities. [0003] In the existing detection methods for railway 25Hz phase-sensitive track signals, it is necessary to extract effective 25Hz phase-sensitive signals from the track signals containing a lot of interference, and quickly and accurately calculate the local voltage and The frequency and phase difference of the track voltage. A phase-sensitive track signal detection method currently used is a phase-sensitive tr...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G01R31/28
CPCG01R31/282
Inventor 雍鸿程戚继飞张松
Owner MIANYANG WEIBO ELECTRONICS
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