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We present a novel technique for ultrawideband RF disambiguation where we are able to determine the precise Nyquist band from which an optically sampled, and therefore downconverted signal originated. This is accomplished by applying a discrete perturbation to the sampling rate, and measuring the magnitude and direction of the shift in signal location within the fundamental Nyquist band. Once the Nyquist band has been determined, the exact signal frequency can also be recovered. We demonstrate extremely accurate multioctave signal recovery over 1 MHz-40 GHz.
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Harmon et al. (2014) studied this question.
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