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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