REPRESENTATION AND ANALYSIS OF COMPLEX CHIRP SIGNALS

In this paper, we present a difference equation model with time-varyin g coefficients for complex-valued multicomponent chirp signals. This m odel may be applied to real-valued signals as a special case. We show the relation between chirp parameters, i.e., instantaneous frequency ( IF) and amplitude (IA), and difference equation coefficients. We prese nt a recursive method for the estimation of the signal poles from whic h IF and IA are obtained. We show that the estimates may be improved b y proper choice of the initial values. We present examples to illustra te the performance of the proposed algorithms. (C) 1998 Elsevier Scien ce B.V. All rights reserved.