地震计阶跃标定信号去除方法研究

Study on Method of Eliminating Seismometer Step Calibration Signal

为去除地震计记录信号中的阶跃标定信号,将理论阶跃信号与多项式拟合方法相结合,提出一种去除阶跃标定信号的方法。通过对比不同时段地脉动信号的功率谱密度(PSD)发现,应用本文方法去除阶跃标定信号后的地震信号的PSD与真实信号的PSD较为接近,同时地震信号的各种震相可被清晰还原。

This paper combines the theoretical step signal with the polynomial fitting method to propose a method to eliminate the step calibration signal in the seismometer record.Comparing the power spectral density(PSD)of the micro-tremor signals at different times,we find that the signal which is eliminated by the proposed method is close to the PSD of the real signal.At the same time,all phases of the step calibration signal eliminated by this method are clearly restored.