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                <term xml:lang="en">SPECTROGRAM</term>
                <term xml:lang="en">TIME-FREQUENCY ANALYSIS</term>
                <term xml:lang="en">MICRO-DOPPLER</term>
                <term xml:lang="en">FEATURE EXTRACTION</term>
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                <term xml:lang="fr">ANALYSE TEMPS-FREQUENCE</term>
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              <p>A preliminary Doppler analysis in the UHF-band on a man walking in free space is presented in this paper. Firstly, the back-scattered response of the moving target has been provided at 1 GHz by a simulation tool based on physical optics theory. Then, a short-time Fourier transform (STFT), a reassignment spectrogram (RE-Spect) and a Wigner-Ville distribution (WVD) have been employed to the data, in order to characterize the micro-Doppler signature of the human body walking. The results are based entirely on numerical tests. The investigation on the time variations of the Doppler spectrum of moving targets in UHF-band is of interest for the emerging radar applications devoted to the detection and tracking of people in highly cluttered environment.</p>
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