In this work an interval observer is proposed for on-line estimation of differentiation errors in some class of highorder differentiators (like a high-gain differentiator from [26], or homogeneous nonlinear differentiator from [23], or super-twisting differentiator [15]). The results are verified and validated on the telescopic link of a robotic arm for forestry applications in which the mentioned approaches are used to estimate the extension velocity while the interval observer gives bounds to this estimation.
['Matteo Guerra', 'Carlos Vazquez', 'Denis V. Efimov', 'Gang Zheng', 'Leonid B. Freidovich', 'Wilfrid Perruquetti']
Interval differentiators: On-line estimation of differentiation accuracy