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15 April 2008 Narrowband frequency-hopping radars for the range estimation of moving and vibrating targets
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An important task in urban sensing operation is accurate estimation and positioning tracking of moving targets. Equally important is target identifications and classifications based on distinctions in the respective motion signatures, such as targets encountering translation versus rotation or vibration motions or targets exhibiting linear versus nonlinear motions. Dual-frequency radars, which estimate the range of a target based on the phase difference between two closely spaced frequencies, have been shown to be a cost-effective method for this purpose. In particular, when time-frequency signal representation techniques are incorporated, Doppler signature enhancement and localization in the time-frequency domain enables robust range estimation of multiple targets with different motion profiles and small radar cross-sections. In this paper, the dual-frequency radar concept is extended to develop a narrowband (NB) frequency-hopping (FH) radar. The proposed NB-FH radar provides multifold advantages such as low probability of intercept, low interference to/from other systems, and flexible bandwidth usage for the improvement of range accuracy and phase unwrapping.
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Yimin Zhang, Moeness G. Amin, and Fauzia Ahmad "Narrowband frequency-hopping radars for the range estimation of moving and vibrating targets", Proc. SPIE 6947, Radar Sensor Technology XII, 694709 (15 April 2008);

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