A design method of causal reduced-order observer-based controllers for sing
ular systems is presented. A new state-space representation of the Bezout i
dentity for singular systems is developed. A parameterization of all causal
reduced-order controllers is also given. The general results given here ca
n be extended to various cases including minimal and full order observer-ba
sed controllers. (C) 2001 Published by Elsevier Science Ltd.