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21 May 2015 Nonlinear synthetic aperture radar imaging using a harmonic radar
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This paper presents synthetic aperture radar (SAR) images of linear and nonlinear targets. Data are collected using a linear/nonlinear step frequency radar. We show that it is indeed possible to produce SAR images using a nonlinear radar. Furthermore, it is shown that the nonlinear radar is able to reduce linear clutter by at least 80 dB compared to a linear radar. The nonlinear SAR images also show the system’s ability to detect small electronic devices in the presence of large linear clutter. The system presented here has the ability to completely ignore a 20-inch trihedral corner reflector while detecting a RF mixer with a dipole antenna attached.
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Kyle A Gallagher, Gregory J. Mazzaro, Kenneth I. Ranney, Lam H. Nguyen, Anthony F. Martone, Kelly D. Sherbondy, and Ram M. Narayanan "Nonlinear synthetic aperture radar imaging using a harmonic radar", Proc. SPIE 9461, Radar Sensor Technology XIX; and Active and Passive Signatures VI, 946109 (21 May 2015);

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