TIME-FREQUENCY REPRESENTATION OF MULTICOMPONENT CHIRP SIGNALS

This work deals with the analysis of chirp signals by means of time-fr equency representation. We propose a chirp adapted time-frequency repr esentation (CA) in which the interferences are significantly reduced. This method is applied to the analysis of acoustic echoes of a sphere target. Comparison of the results to other types of time-frequency dis tribution of the Cohen's class shows that the identification of the si gnal features with CA representation is clearer than with other types of bilinear time-frequency distributions. (C) 1997 Elsevier Science B. V.