Abstract
In his recent work, Monopoli seems to have established the design method for model reference adaptive control for single-input single-output linear systems. The basis of his method is validated mainly in the design of a special system of which the difference between the degrees of the denominator and the numerator polynomials of the plant transfer function, so called the “relative degree”, is one. It has been seen that the design method becomes extremely complicated with an increase of the relative degree. A design method for model reference adaptive control systems using an adaptive observer to avoid this difficulty is discussed in this paper.