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Characteristic extraction of underwater targets by using fractional Fourier transform

Yu Qin

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Abstract

A new method of time-frequency analysis,Fractional Fourier Transform (FRFT),is proposed for the target characteristics extraction.Shown by the results of simulation and experimental data with the chirp signal being transmitted,FRFT can concentrate the energy of target echo into the corresponding fractional domain which results in the properties of the fractional Fourier spectrum of target echo quite different from that of the reverberation,and contribute higher recognition accuracy than other time-frequency methods do.

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What this paper is about

A new method of time-frequency analysis,Fractional Fourier Transform (FRFT),is proposed for the target characteristics extraction.Shown by the results of simulation and experimental data with the chirp signal being transmitted,FRFT can concentrate the energy of target echo into the corresponding fractional domain which results in the properties of the fractional Fourier spectrum of target echo quite different from that of the reverberation,and contribute higher recognition accuracy than other time-frequency methods do.

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Available abstract

A new method of time-frequency analysis,Fractional Fourier Transform (FRFT),is proposed for the target characteristics extraction.Shown by the results of simulation and experimental data with the chirp signal being transmitted,FRFT can concentrate the energy of target echo into the corresponding fractional domain which results in the properties of the fractional Fourier spectrum of target echo quite different from that of the reverberation,and contribute higher recognition accuracy than other time-frequency methods do.

Key concepts: Fractional Fourier transform, Short-time Fourier transform, Fourier transform, Chirp, Energy (signal processing), Reverberation, Frequency domain, Computer science

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