ABSTRACT
In the comment by Kaldmäe and Kotta [2018. Comments on ‘a new kind of nonlinear disturbance observer for nonlinear systems with applications to cruise control of air-breathing hypersonic vehicles’. International Journal of Control, 1–2 (just-accepted)], it is shown that the result in Yang, Meng, and Sun [2017. A new kind of nonlinear disturbance observer for nonlinear systems with applications to cruise control of air-breathing hypersonic vehicles. International Journal of Control, 90 (9), 1935–1950] is not practically usable and it cannot be corrected easily. In this note, it is shown how the result can be corrected. Previous work that enables such estimation is mentioned.
Disclosure statement
No potential conflict of interest was reported by the authors.