  In this brief note we present two new parameter identifiers whose estimates
converge in finite time under weak interval excitation assumptions. The main
novelty is that, in contrast with other finite-convergence time (FCT)
estimators, our schemes preserve the FCT property when the parameters change.
The previous versions of our FCT estimators can track the parameter variations
only asymptotically. Continuous-time and discrete-time versions of the new
estimators are presented
