... instantaneous frequency (IF) of a signal is a param-eter of practical importance in situations such as seis-mic, radar, sonar, communications, and biomedical appli-cations [1, 2, 3, 4]. In all ... Recommended for Publication by John SorensenAnalysis of nonstationary signals is a challenging task. True nonstationary signal analysis involves monitoring the frequencychanges of the signal over ... spectralpeaks) are varying with time. These signals are often referredto as nonstationary signals. A chirp signal is a simple exam-ple of a nonstationary signal, in which the frequency of thesinusoidal...