We propose a method to "create" a new measurement output by exciting the system with a high-frequency oscillation. This new "virtual" measurement may be useful to facilitate the design of a suitable control law. The approach is especially interesting when the observability from the actual output degenerates at a steady-state regime of interest. The proposed method is based on second-order averaging and is illustrated by simulations on a simple third-order system.
@article{arxiv.1510.00338,
title = {Adding virtual measurements by signal injection},
author = {Pascal Combes and Al Kassem Jebai and François Malrait and Philippe Martin and Pierre Rouchon},
journal= {arXiv preprint arXiv:1510.00338},
year = {2016}
}