时频联合分析地震计正弦标定数据

Time-frequency joint analysis on sine calibration data of seismometer

介绍短时傅里叶变换,分析地震计正弦标定信号的特点,提出基于时间域和频率域联合分析正弦标定波形组起始点的方法,可以准确找出每组正弦标定信号的频率和振幅,计算地震计的速度响应灵敏度。

In this article,the authors describe the short-time Fourier transform.Introduce the char-acteristics of the sine calibration signal of seismometer in time domain and frequency domain, propose an algorithm for identifying the starting and ending points in calibration data base on the joint of time-domain and frequency domain first time.Using this algorithm,we can accu-rately identify each sine calibration signal frequency and amplitude,and then calculate the velocity response sensitivity of seismometer.