Comments on ‘Differentiator application in altitude control for an indoor blimp robot’

Abstract

Comparison of several types of differentiation algorithms has been performed in the paper Wang, Zheng, Efimov, and Perruquetti [(2018). Differentiator application in altitude control for an indoor blimp robot. International Journal of Control, 1–10. Retrieved from https://doi.org/10.1080/00207179.2018.1441549] with application to a robotic blimp altitude control. Unfortunately, one of the differentiation methods, the algebraic differentiator, has not been applied properly. The clarifications and the new comparison results are given in this note.