21 May 2015 Instantaneous, stepped-frequency, nonlinear radar
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Researchers have recently developed radar systems capable of exploiting non-linear target responses to precisely locate targets in range. These systems typically achieve the bandwidth necessary for range resolution through transmission of either a stepped-frequency or chirped waveform. The second harmonic of the reflected waveform is then analyzed to isolate the non-linear target response. In other experiments, researchers have identified certain targets through the inter-modulation products they produce in response to a multi-tone stimulus. These experiments, however, do not exploit the phase information available in the inter-modulation products. We present a method for exploiting both the magnitude and phase information available in the inter-modulation products to create an “instantaneous” stepped frequency, non-linear target response. The new approach enables us to both maintain the unambiguous range dictated by the fundamental, multi-tone separation and obtain the entire target signature from a single transmitted waveform.
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Kenneth Ranney, Kenneth Ranney, Kyle Gallagher, Kyle Gallagher, Anthony Martone, Anthony Martone, Gregory Mazzaro, Gregory Mazzaro, Kelly Sherbondy, Kelly Sherbondy, Ram Narayanan, Ram Narayanan, } "Instantaneous, stepped-frequency, nonlinear radar", Proc. SPIE 9461, Radar Sensor Technology XIX; and Active and Passive Signatures VI, 946122 (21 May 2015); doi: 10.1117/12.2186620; https://doi.org/10.1117/12.2186620

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