Document Type
Article
Publication Date
1-1-2022
Abstract
We provide new reduced order observer designs for a key class of nonlinear dynamics. When continuous output measurements are available, we prove that our observers converge in a fixed finite time in the absence of perturbations, and we prove a robustness result under uncertainties in the output measurements and in the dynamics, which bounds the observation error in terms of bounds on the uncertainties. The observers contain a dynamic extension with only one pointwise delay, and they use the observability Gramian to eliminate an invertibility condition that was present in earlier finite time observer designs. We also provide analogs for cases where the measurements are only available at discrete times, where we prove exponential input-to-state stability. We illustrate the advantages of our new observers using a DC motor dynamics.
Publication Source (Journal or Book title)
IEEE Control Systems Letters
First Page
1561
Last Page
1566
Recommended Citation
Mazenc, F., & Malisoff, M. (2022). New finite-time and fast converging observers with a single delay. IEEE Control Systems Letters, 6, 1561-1566. https://doi.org/10.1109/LCSYS.2021.3123688