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A system for measuring an RF input signal frequency includes a sampling optical pulse train with a frequency-dithered repetition-rate, and a sub-sampled analog link coupled to the optical pulse train whereby the RF input signal frequency is determined. This frequency dither imparts well-characterized modulation sidebands onto the input RF signal to be measured. By measuring the amplitude of these sidebands relative to the incoming aliased signal amplitude the frequency of the original signal is readily determined. The use of optical sampling dramatically increases the bandwidth over which the disambiguation technique is applied, and coarse disambiguation is achieved in a single acquisition.