兵工自动化2025，Vol.44Issue(10)：35-39,55,6.DOI:10.7690/bgzdh.2025.10.008
基于EMD和时频分析的遥测振动信号降噪方法
Telemetry Vibration Signal Denoising Method Based on EMD and Time-frequency Analysis
摘要
Abstract
Aiming at the problem that it is difficult to denoise the telemetry vibration signal with rich frequency content in aircraft test,a denoising method of telemetry vibration signal based on empirical mode decomposition(EMD)and time-frequency analysis is proposed,and the noisy signal is decomposed by multi-scale EMD.The intrinsic mode function(IMF)at different scales are obtained,and the corresponding time-frequency representation is obtained by short-time Fourier transform(STFT),and the filtering threshold is set according to the time-frequency energy distribution.Filtering is performed in the time-frequency domain.And performing STFT inverse transformation on the filtered time-frequency representation,and accumulating and summing to obtain a denoised signal.The method has better noise suppression capability and protects the detail information in the signal from being lost.Computer simulation and real data processing results show that compared with EMD denoising and wavelet denoising,this method improves the SNR by 2.8 and 2.4 dB in the simulation condition,and improves the SNR by 14.3 and 10.1 dB in the real signal,which proves that this method has practical application value in the telemetry vibration signal preprocessing.关键词
遥测/振动信号/EMD/时频分析/降噪Key words
telemetry/vibration signal/EMD/time-frequency analysis/noise reduction分类
信息技术与安全科学引用本文复制引用
李振兴,李冬,刘建男..基于EMD和时频分析的遥测振动信号降噪方法[J].兵工自动化,2025,44(10):35-39,55,6.基金项目
国家自然科学基金项目(61703408) （61703408）
