The instantaneous frequency estimation is required in various applications involving radar, audio and seismic signals. It becomes a hard task in case of multicomponent signals having interfering single modes. The existing non-linear methods, such as reassignment and synchrosqueezing, enhance the readability of time-frequency representations, but they are effective only under the assumption of separability of the modes, i.e. they fail to discriminate modes in case of strong interference. In this work, a non-parametric approach for separating the single modes of a multicomponent frequency modulated signal is presented. It is mainly based on the Radon Transform of signal spectrogram which has the ability to discriminate between the single modes. Hence, the inverse Radon transform of a small selection of Radon distribution allows us to separate each component by isolating the ridge curves even in the non-separable case.

Instantaneous frequency modes separation via a spectrogram-radon based approach / Bruni, V.; Tartaglione, M.; Vitulano, D.. - 2019-:(2019), pp. 347-351. ((Intervento presentato al convegno 11th International Symposium on Image and Signal Processing and Analysis, ISPA 2019 tenutosi a Centre for Advanced Academic Studies, hrv [10.1109/ISPA.2019.8868843].

Instantaneous frequency modes separation via a spectrogram-radon based approach

Bruni V.;Tartaglione M.
;
Vitulano D.
2019

Abstract

The instantaneous frequency estimation is required in various applications involving radar, audio and seismic signals. It becomes a hard task in case of multicomponent signals having interfering single modes. The existing non-linear methods, such as reassignment and synchrosqueezing, enhance the readability of time-frequency representations, but they are effective only under the assumption of separability of the modes, i.e. they fail to discriminate modes in case of strong interference. In this work, a non-parametric approach for separating the single modes of a multicomponent frequency modulated signal is presented. It is mainly based on the Radon Transform of signal spectrogram which has the ability to discriminate between the single modes. Hence, the inverse Radon transform of a small selection of Radon distribution allows us to separate each component by isolating the ridge curves even in the non-separable case.
11th International Symposium on Image and Signal Processing and Analysis, ISPA 2019
Instantaneous frequency; Non-separable interfering multicomponent signals; Radon Transform; Ridge curves; Spectrogram
04 Pubblicazione in atti di convegno::04b Atto di convegno in volume
Instantaneous frequency modes separation via a spectrogram-radon based approach / Bruni, V.; Tartaglione, M.; Vitulano, D.. - 2019-:(2019), pp. 347-351. ((Intervento presentato al convegno 11th International Symposium on Image and Signal Processing and Analysis, ISPA 2019 tenutosi a Centre for Advanced Academic Studies, hrv [10.1109/ISPA.2019.8868843].
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Utilizza questo identificativo per citare o creare un link a questo documento: https://hdl.handle.net/11573/1336817
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