Title :
Semi-Global Multi-Frequency Estimation in the Presence of Deadzone and Saturation
Author :
Carnevale, D. ; Astolfi, A.
Author_Institution :
Dipt. di Inf., Sist. e Produzione (DISP), Univ. di Roma Tor Vergata, Rome, Italy
Abstract :
A hybrid observer to estimate the frequencies of a signal composed of a finite number of sinusoids and measured through saturation and deadzone nonlinearities is proposed. The observer design exploits the Immersion and Invariance technique combined with a classic high-gain approach, yielding semi-global exponential convergence to zero of the estimation errors. Simulation results are provided to illustrate the effectiveness of the observer.
Keywords :
convergence; frequency estimation; observers; signal processing; deadzone nonlinearities; estimation errors; high-gain approach; hybrid observer; immersion technique; invariance technique; saturation; semiglobal exponential convergence; semiglobal multifrequency estimation; signal frequency estimation; sinusoids; Convergence; Estimation error; Frequency estimation; Lyapunov methods; Observers; Time measurement; Vectors; Adaptive hybrid observer; frequency estimation; saturated output;
Journal_Title :
Automatic Control, IEEE Transactions on
DOI :
10.1109/TAC.2013.2294818
