Parameter estimation-based observers are a new kind of state reconstruction methods
where the state observation task is translated into an on-line parameter estimation problem.
A key step for its application is the transformation of the system dynamics into a particular
cascade form, which involves the solution of a partial differential equation that, moreover,
should satisfy some injective requirement. In this note we use a recently proposed technique
of signal injection to generate new outputs and simplify these tasks. In this way, we make …