TIME–FREQUENCY SPECTRA FOR FREQUENCY-MODULATED PROCESSES

✍ Scribed by S.A. Dalianis; J.K. Hammond

• Book ID: 102615724
• Publisher: Elsevier Science
• Year: 1997
• Tongue: English
• Weight: 362 KB
• Volume: 11
• Category: Article
• ISSN: 0888-3270
• DOI: 10.1006/mssp.1997.0100

✦ Synopsis

Time-frequency spectra are accepted as a useful approach to characterising non-stationary phenomena. However, most applications are empirical and there is interest in constructing analytical models of such phenomena. This paper addresses the analytic modeling of a class of non-stationary stochastic processes exhibiting frequency-modulated forms. This includes acoustic phenomena with Doppler shifts and vehicle vibrational motion at variable speed. Wigner distributions are derived for specific velocity-time histories and compared with sample empirical calculations using the concept of covariance equivalence.