Estimation of evolutionary spectrum based on STFT and modified group delay

Narasimhan, SV and Pavanalatha, S (2003) Estimation of evolutionary spectrum based on STFT and modified group delay. In: IEEE TENCON 2003: Conference on Convergent Technologies for the Asia-Pacific Region, 15-17 Oct 2003, Bangalore, India.

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Abstract

This paper proposes a new estimator for Evolutionary Spectrum (ES) based on short time Fourier transform (STFT) and modified group delay (MGD). Here, the STFT enables crossterm suppression and the MGD preserves the frequency resolution of the rectangular window. It is applicable to deterministic and random signals generated by time varying systems. The proposed method provides signal to noise ratio enhancement due to the use of MGD. The results indicate that for linear chirp signals and for time varying random process, its frequency resolution is close to that of WVD and better than Evolutionary periodogram (EP) and STFT. Further, its noise immunity is better than those of EP and STFT.

Item Type: Conference or Workshop Item (Paper)
Uncontrolled Keywords: Fourier transform;Rectangular window
Subjects: AERONAUTICS > Aerodynamics
Division/Department: Aerospace Electronics and Controls Division, Other
Depositing User: M/S ICAST NAL
Date Deposited: 29 Mar 2007
Last Modified: 24 May 2010 09:55
URI: http://nal-ir.nal.res.in/id/eprint/4100

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