期刊
IEEE TRANSACTIONS ON INSTRUMENTATION AND MEASUREMENT
卷 60, 期 9, 页码 3222-3229出版社
IEEE-INST ELECTRICAL ELECTRONICS ENGINEERS INC
DOI: 10.1109/TIM.2011.2124770
关键词
Chirplet transform (CT); instantaneous frequency (IF); polynomial chirplet transform (PCT); short-time Fourier transform (STFT); time-frequency analysis
资金
- University of China [NCET-10-0548]
- Natural Science Foundation of China [10902068, 10732060]
- State Key Laboratory of Mechanical System and Vibration (MSV), China [MSV-ZD-2010-01]
- Shanghai Pujiang Program [10PJ1406000]
In this paper, a new time-frequency analysis method known as the polynomial chirplet transform (PCT) is developed by extending the conventional chirplet transform (CT). By using a polynomial function instead of the linear chirp kernel in the CT, the PCT can produce a time-frequency distribution with excellent concentration for a wide range of signals with a continuous instantaneous frequency (IF). In addition, an effective IF estimation algorithm is proposed based on the PCT, and the effectiveness of this algorithm is validated by applying it to estimate the IF of a signal with a nonlinear chirp component and seriously contaminated by a Gaussian noise and a vibration signal collected from a rotor test rig.
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