This paper deals with the problem of stabilizing a system in the presence of
small measurement errors. It is known that, for general stabilizable systems,
there may be no possible memoryless state feedback which is robust with
respect to such errors. In contrast, a precise result is given here, showing
that, if a (continuous-time, finite-dimensional) system is stabilizable in any
way whatsoever (even by means of a dynamic, time varying, discontinuous,
feedback) then it can also be semiglobally and practically
stabilized in a way which is insensitive to
small measurement errors, by means of a hybrid strategy based on the idea of
sampling at a “slow enough” rate.