Nonlinear radar has proven to be a viable means of detecting devices that contain electrical nonlinearities. Electrical nonlinearities are present in dissimilar metals, metal to oxide junctions, semiconductors and more. This paper presents a linear and nonlinear synthetic aperture radar (SAR) system capable of imaging linear and nonlinear targets. The system creates images using data collected from a fixed 16 channel receiver with a single transmitter. A custom 16:1 switching network was developed to collect the SAR data from a 16 antenna receive array. SAR images presented show a nonlinear target placed directly on the ground and imaged in multiple range and cross-range locations. Data is also presented showing the clutter rejection properties of nonlinear radar. Images show that the harmonic radar is able to ignore the strong linear response from a corner reflector, while retaining the nonlinear response from a target.
Kyle A. Gallagher, Kenneth I. Ranney, Gregory J. Mazzaro, Anthony F. Martone, Kelly D. Sherbondy, and Ram M. Narayanan, "Recent non-linear radar research at the Army Research Laboratory," Proc. SPIE 10188, Radar Sensor Technology XXI, 101881B (Presented at SPIE Defense + Security: April 12, 2017; Published: 25 May 2017); https://doi.org/10.1117/12.2266266.
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