A New Discrete Spectrum Correction Method for Ultra-Low Frequency Signals with Negative Frequency Contribution
The traditional analysis and correction method for discrete spectrum has greater error for the extreme frequency signal which widely existing in vibration engineering such as ultra low frequency signal, short time signal and ultra high frequency signal(close to the Nyquist frequency). In this paper we analyze the typical situation of extreme frequency signal and put forward a new discrete spectrum method based on accounting the influence of ultra low frequency. This method based on Blackman window sets up a discrete spectrum correction model involving the contribution of positive-negative frequency by utilizing the three spectral line near the local spectral peak. The frequency, amplitude and phase can be got by the solution of the model. The result coming from the simulation verification of the spectrum correction formula using frequency scanning indicates that this method efficiently lowers the influence of negative spectrum, and has higher precision for the frequency, amplitude and phase of the ultra low frequency.
Spectrum Correction Extremely low frequency Extreme frequency Negative Frequency Blackman Window
MAO Yuwen TU Yaqing Niu Penghui
Dept of Information Engineering, Logistical Engineering University, Chongqing 401311 Army Aviation Institute of PLA, Beijing 101123, China
国际会议
The 31st Chinese Control Conference(第三十一届中国控制会议)
合肥
英文
7570-7575
2012-07-01（万方平台首次上网日期，不代表论文的发表时间）