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Author(s): |
Ting Gao, Department of system engineering, Beijing university of Aeronautics and Astronautics, BUAA, Beijing, China
Yufeng Sun, Department of system engineering, Beijing university of Aeronautics and Astronautics, BUAA, Beijing, China
Mei Li, School of Geophysics and Geoinformation Systems, China university of Geosciences, CUGB, Beijing, China |
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Abstract: |
To study the transfer characteristics of a system, the most commonly method is to measure phase-frequency and amplitude-frequency characteristics of its transfer function. It is easy to obtain amplitude- frequency characteristics, but the measure and analysis of the phase-frequency characteristics is much more difficult. However, the phase information is necessary when evaluates the impulse characteristics of a system using results of frequency measurement. For a minimum phase system, the method of impulse and step response reconstruction using amplitude and phase information is presented in this paper, where the phase information is estimated from amplitude-frequency characteristics based on Hilbert transform. The paper also gives a kind of realization of the method using virtual instrument based on Labview platform, and the validity of the method is verified by means of a practical application finally.
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