A high-speed rail speed estimation method using 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, in particular to a method for estimating the running speed of a high-speed rail using amplitude spectrum autocorrelation. Background technique [0002] Up to now, the operating mileage of China's high-speed rail has reached 31,000 kilometers, which is close to 70% of the total operating mileage of the world's high-speed rail. From 0:00 on July 10, 2019, the national railways will implement a new train diagram, and more than 3,000 pairs of trains will be operated every day. High-speed trains run at high speed on high-speed rail lines, and their running speed is not only an important parameter reflecting the safety of train operation, but also the key to subsequent use of high-speed trains to cause vibration signals. Currently existing methods for obtaining the running speed of high-speed trains mainly include: [0003] Existing technology 1: Use on-board equipment to obtain the train runnin...

AI Technical Summary

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

Images