High-speed rail running speed estimation method utilizing amplitude spectrum autocorrelation

Abstract

The invention discloses a high-speed rail running speed estimation method utilizing amplitude spectrum autocorrelation. The method comprises the following steps that: signals excited when a high-speedrail passes through are intercepted from the seismic data of a single-detector; Fourier transform is performed on the intercepted signals, so that the amplitude spectrum of the intercepted signals can be obtained; the energy spectrum cumulative function of the signals intercepted in the previous step is calculated, and an energy frequency interval is determined; the autocorrelation function of the amplitude spectrum of the signals is calculated; a maximum peak value, a second peak value and frequencies corresponding to the maximum peak value and the second peak value are searched in the autocorrelation function, so that a frequency interval between the maximum peak value and the second peak value can be obtained; and the estimation of the running speed of the high-speed train is obtainedbased on the frequency interval between the maximum peak value and the second peak value and the length of each carriage of the high-speed train.

Description

Technical field [0001] The invention belongs to the field of exploration geophysics, and particularly relates to a method for estimating the operating speed of a high-speed railway using amplitude spectrum autocorrelation. Background technique [0002] Up to now, China's high-speed rail operating mileage has reached 31,000 kilometers, close to 70% of the world's total high-speed rail operating mileage. Starting at 0:00 on July 10, 2019, national railways have implemented a new train operation map, with more than 3,000 pairs of mobile trains operating every day. High-speed rail trains run on high-speed rail lines at high speed, and their operating speed is not only an important parameter reflecting the safety of train operation, but also the key to subsequent use of high-speed rail trains to cause vibration signals. The existing methods for obtaining the operating speed of high-speed trains mainly include: [0003] Existing technology 1: Use on-board equipment to obtain the train ...

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Problems solved by technology

[0005] Existing technology 3: A method based on amplitude spectrum template matching, that is, a geophone is embedded outside the isolation area of ​​the high-speed rail line, and then the amplitude spectrum of the signal received by the geophone is used to make cross-correlation coefficients with a series of preset amplitude spectrum templates , select the speed corresponding to the maximum cross-correlation function as the estimation of the train running speed, this method requires a large number of amplitude spectrum template functions, and requires two speed scanning processes at the same time, which requires a large amount of calculation

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