Zt. Ding, GLOBAL ADAPTIVE OUTPUT-FEEDBACK STABILIZATION OF NONLINEAR-SYSTEMS OFANY RELATIVE DEGREE WITH UNKNOWN HIGH-FREQUENCY GAINS, IEEE transactions on automatic control, 43(10), 1998, pp. 1442-1446
This paper presents an algorithm for adaptive output feedback stabiliz
ation of nonlinear single-input/single-output, minimum phase systems o
f any relative degree which are linear with respect to input and unkno
wn constant parameter vector. The algorithm does not require the knowl
edge of the sign of the high-frequency gain.