High resolution spectrograms using a component optimized short-term fractional Fourier transform

Authors:
Aled T. Catherall;Duncan P. Williams
Affiliations:
Defence Science & Technology Laboratory, Physical Sciences, Porton Down, Salisbury SP4 0JQ, UK;Defence Science & Technology Laboratory, Physical Sciences, Porton Down, Salisbury SP4 0JQ, UK
Venue:
Signal Processing
Year:
2010

Citing 6
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Abstract

We present an algorithm based on a short-term representation of the fractional Fourier transform which is highly suited to signals that contain multiple non-stationary components. To compare the time-frequency resolution of such signals using our proposed technique, we analyze several signals which contain multiple non-stationary components, including a synthetic signal and a bat echolocation signal. We demonstrate that our technique offers time-frequency representations with superior time-frequency resolution than several other established methods.