Frequency and Offset Online Estimation of Sinusoidal Signals Based on High-Order Nonlinear Continuous Differentiator |
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Authors: | WANG Hongwei ZHANG Wei ZUO Junyi WANG Heping |
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Affiliation: | 1. School of Aeronautics, Northwestern Polytechnical University, Xi'an 710072, China;Experimental Aircraft Design and Flight Testing Laboratory of Shaanxi, Xi'an 710072, China;2. School of Aeronautics, Northwestern Polytechnical University, Xi'an 710072, China |
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Abstract: | Real-time parameter identification of si-nusoidal signals is an essential research topic due to its broad utilization in both theoretical studies and engineer-ing practice. A tracking differentiator based online estima-tion framework has been proposed to simultaneously iden-tify frequencies and offset of given multi-sinusoidal signal. Tracking differentiator is exploited in presented framework to track the time derivatives of measurements which are then utilized to estimate the frequencies and offset. We introduce a tracking differentiator called high-order non-linear continuous differentiator into the framework, giving birth to a new estimation algorithm. Comparative exper-iments on both single and two sinusoidal signal are sim-ulated, indicating the superiority of proposed method on both convergent speed and estimation accuracy. |
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Keywords: | Frequency estimation Offset estimation High-order nonlinear continuous differentiator Sinusoidal signal Multi-sinusoidal signal |
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