High-speed railway earthquake early warning system single/double-seismometer interference identification method

Abstract

The invention discloses a high-speed railway earthquake early warning system single / double-seismometer interference identification method and belongs to the field of railway engineering technologies.The method comprises the following steps that: 1) an event trigger starting point is determined on the basis of the increase rate change of earthquake acceleration in a certain direction; 2) single-seismometer waveform characteristic analysis is carried out on data in a time window with a preset length which come from two seismometers after an event is triggered, so that whether the signals of thetwo seismometers are interference signals is judged, if it is judged that the signals of the two seismometers are effective seismic signals, the method shifts to the next step; and 3) data preprocessing is performed on the signals from the two seismometers through discrete wavelet transformation, and correlation analysis is carried out through a post-preprocessing wavelet coefficient, and whetheran earthquake event occurs is judged according to judgment on whether similarity meets a preset condition. With the method adopted, interference data can be effectively identified with the timelinessof earthquake early warning ensured.

Description

technical field [0001] The present invention relates to railway engineering technology. Background technique [0002] In the environment of high-speed railway operation, the earthquake early warning and monitoring system needs to quickly identify whether the event waveform is a real earthquake event in a short period of time (usually within 3 seconds after the arrival of the seismic wave), and at the same time have a high recognition rate and a low There are several ways to reduce the false alarm rate at this stage: [0003] 1. Analysis method based on time domain. Based on the actual shape analysis after the arrival of the seismic P wave, it is a method to judge whether it is an interference event by analyzing the parameters such as the peak value distribution and the maximum energy change rate of the P wave in the next few seconds. [0004] 2. Analysis method based on frequency domain. After performing various transformations on the waveform in the time domain, extract ...

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Problems solved by technology

[0005] Comparing the above two methods, (1) the method has the highest calculation efficiency, but it only processes the time series at the time domain level, and cannot identify the interference waveforms whose shape is similar to the seismic wave in the first few seconds; (2) the method is based on various This kind of mathematical transformation decomposes the signal and extracts features, but it is greatly affected by the length of the recorded data

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