Real-time correction method for dynamic displacement of track circuit reader signal carrier frequency

Abstract

The invention relates to a real-time correction method for the dynamic displacement of the track circuit reader signal carrier frequency, which belongs to the railway field and is used for solving the problem that the track circuit reader signal carrier frequency generates dynamic displacement. The real-time correction method comprises the following steps of: obtaining a standard value fc of the track circuit reader signal carrier frequency; calculating a compensation capacitor impedance in a track circuit; obtaining a train equivalent shunt resistance Rf; calculating a carrier frequency displacement factor beta; obtaining a train running speed vs; calculating the dynamic displacement delta fc of the track circuit reader signal carrier frequency at the running speed; calculating the frequency spectrum of the receiving signal of the track circuit reader by the track circuit reader; and according to the calculation result of the dynamic displacement delta fc, moving the integral frequency spectrum to the zero-frequency direction for delta fc, i.e. subtracting the dynamic displacement delta fc from the carrier frequency f'c in the frequency spectrum so as to realize a corresponding correction process. Information required by the correction method is directly from railway field equipment and can be directly integrated to rail circuit reader equipment, and therefore reliability and accuracy on extracting train target speed information are improved in the high-speed running process of a train.

Description

technical field [0001] The invention relates to the field of railways, and relates to a correction method, in particular to a real-time correction method for the dynamic offset of the signal carrier frequency of a track circuit reader. technical background [0002] Train operation control system (abbreviation: train control system), as an important equipment to ensure traffic safety, plays a vital role in the train speed control of railways, especially high-speed railways. As one of the key equipment of the system, the track circuit reader forms the corresponding track circuit reader signal through electromagnetic induction with the ground track circuit, and then uses the corresponding algorithm to extract the target speed information contained in the signal ahead of the train running , and further transmit it to the host computer of the train control system as the basis for controlling the running speed of the train. It can be seen that the generation quality and change la...

AI Technical Summary

Problems solved by technology

Therefore, during the high-speed operation of the train, the corresponding carrier frequency may deviate from its normal index range, which will eventually affect the extraction of the target speed information ahead of the train.

[0004] It can be seen that it is necessary to correct the dynamic offset of the carrier frequency of the track circuit reader signal in real time during the operation of the train, but there is no corresponding research result or solution.

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