Interference identification method of single and double seismometers in high-speed railway earthquake early warning system

Abstract

Disclosed is a single-dual seismometer interference identification method for a high-speed railway earthquake early warning system, involving railway engineering technology. The present invention comprises the following steps: 1) determining the starting point of event triggering by the amplitude change in a certain direction of the seismic acceleration; 2) analyzing the waveform characteristics of a single seismometer on data from two seismometers within a time window of a predetermined length after event triggering Judging whether the signal is disturbed, if both seismometers are judged to be valid seismic signals, then enter the next step; 3) For the signals from the two seismometers, use discrete wavelet transform for data preprocessing, and use the preprocessed wavelet coefficients to correlate Based on the similarity analysis, it is determined whether a seismic event occurs or not based on whether the similarity meets the preset conditions. The invention can effectively identify the interference data on the basis of ensuring the timeliness of earthquake early warning.

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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