摘要
为高精度识别定点潮汐形变观测中干扰信号的时频响应特征,提出一种基于小波分解和同步挤压变换的形变干扰数据分频时频分析方法。首先,选用合适的小波基和分解层数对原始数据做多尺度分解和重构,提取出目标异常干扰分量信号;其次,基于分频策略采用高频分辨率较好的同步挤压广义S变换处理高频干扰分量,采用低频分辨率较好的同步挤压小波变换处理中低频干扰分量,同步挤压变换可以在传统方法结果基础上进一步“挤压”瞬时频带,获得更高精度的时频谱结果。利用该方法处理分析2016—2020年西昌小庙台形变观测中受调零标定、人为进洞、道路施工交通、抽水、降雨、地震波等因素影响的典型干扰数据,得到各类形变观测手段在不同干扰因素下的时频响应特征,为准确识别干扰及异常特征提供时频谱特征方面的参考。
To accurately distinguish the time-frequency response characteristics of interference signals in fixed-point tidal deformation observation data,we propose a frequency division time-frequency analysis method based on wavelet decomposition and the synchrosqueezing transform.First,the original data were decomposed and reconstructed by selecting the appropriate wavelet basis and decomposition levels,and the target interference component signal was extracted.Second,based on the frequency division strategy,the high-frequency interference component was processed using the synchrosqueezing generalized S-transform with a good high-frequency resolution,and the medium-and low-frequency interference components were processed using the synchrosqueezing wavelet transform with a good low-frequency resolution.The synchrosqueezing transform can further“squeeze”the instantaneous frequency band on the basis of the results of the traditional method and obtained time-frequency spectrum results with higher precision.The proposed method was used to process and analyze typical interference data affected by many factors in the deformation observation of Xiaomiao station in Xichang from 2016 to 2020,such as zeroing and calibration,cavern entrance,road construction and traffic,pumping,rainfall,and seismic waves.The time-frequency response characteristics of various deformation observation methods under different interference factors were obtained,thus providing a reference for the accurate identification of interference and abnormal characteristics.
作者
杨志鹏
陈秀清
余洋洋
张御阳
巫萌飞
徐建明
赵晶
张正伟
YANG Zhipeng;CHEN Xiuqing;YU Yangyang;ZHANG Yuyang;WU Mengfei;XU Jianming;ZHAO Jing;ZHANG Zhengwei(Xichang Seismic Central Station,Sichuan Earthquake Agency,Xichang 615022,Sichuan,China;Sichuan Earthquake Disaster Risk Prevention and Control Center,Sichuan Earthquake Agency,Chengdu 610041,Sichuan,China;Sichuan Seismic Station,Chengdu 610041,Sichuan,China)
出处
《地震工程学报》
CSCD
北大核心
2022年第5期1192-1206,共15页
China Earthquake Engineering Journal
基金
2021年度中国地震局地震监测、预报、科研三结合课题(3JH-2021041)
国家自然基金联合基金项目(U19A2098)。
关键词
西昌小庙地震台
形变干扰
同步挤压变换
小波分解
时频响应特征
Xiaomiao station in Xichang
deformation interference
synchrosqueezing transform
wavelet decomposition
time-frequency response characteristics
