针对微震信号的非平稳宽频带特征,采用环境噪声层相关阈值,基于固有时间尺度分解(ITD),建立了一种高效的去噪算法。与小波变换为基础的去噪对比结果表明,ITD算法去噪彻底,去噪波形与原始波形峰值位置精确一致、到时突变细节保留完整,适用于对初至波到时精确拾取和判断。 Aiming at the characteristics of non-stationary broadband of microseismic signals, an effective denoising algorithm based on ITD is proposed by using the threshold of ambient noise level. Compared with the wavelet transform, the result of denoising shows that the denoising of ITD algorithm is complete and the denoising waveform is exactly the same as the peak position of the original waveform. The detail of the mutation remains intact and is suitable for picking up and judging the arrivals of the first arrivals.