9 November 1993 Photorefractive phased-array-radar processor dynamics
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We derive, and experimentally verify the dynamic and steady state behavior of a high- bandwidth, large degree-of-freedom adaptive phased-array-radar optical processor. The large number of adaptive weights necessary for processing in a complex radar signal environment with large arrays are computed in the form of dynamic three-dimensional volume holograms in a photorefractive crystal. The processor computes the angles-of-arrival of multiple interfering narrowband radar jammers and adaptively steers nulls in the antenna pattern in order to extinguish the jammers. The theoretical model developed provides analytical expressions relating system parameters such as feedback gain and phase to suppression depth and convergence rates for multiple narrowband jammers of arbitrary spatial profile. We have obtained experimental verification of the system behavior showing excellent agreement with the theoretical model and experimental jammer suppression as high as -35 dB.
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Anthony W. Sarto, Robert T. Weverka, and Kelvin H. Wagner "Photorefractive phased-array-radar processor dynamics", Proc. SPIE 2026, Photonics for Processors, Neural Networks, and Memories, (9 November 1993); doi: 10.1117/12.163620; https://doi.org/10.1117/12.163620


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