Model reference adaptive control with unknown high-frequency gain

摘要

An indirect model reference adaptive control for minimum-phase linear systems of arbitrary order with unknown high-frequency gain is presented. It is proved that the (modified) estimate of the high-frequency gain has a uniform positive lower bound. The problem has been solved by using the least squares covariance matrix properties to define an appropriate modification of the parameter estimates. The proposed algorithm requires neither signal normalization nor the definition of an augmented error.