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2 December 2010 Optical implementation for adaptive beamforming of array antenna
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It is difficult for the traditional phased array radar to process large array-element and high time-bandwidth-product signal in real time. An optical architecture of implement true time delay adaptive beamforming based on Stimulate Photon Echoes(SPE) is introduced. The principle of how to implement a true time delay based on SPE phenomenon with its theory models is established. the method of how to implement variable time delays using laser beams modulated by linear frequency chirped pulses is discussed, the relationship between chirp bandwidth and delay step is demonstrated by simulation results. As a result, it allows to filter thousands of simultaneous AOAs with 30 GHz dynamically in both spatial and spectral domains, which can be used to adaptively steer a large RF phased array antenna toward the direction of interest while minimizing the effects of unwanted interference signals.
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Ming Liu and Xiang quan Shi "Optical implementation for adaptive beamforming of array antenna", Proc. SPIE 7851, Information Optics and Optical Data Storage, 785112 (2 December 2010);

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