Patent ID: 7236901

Claim:
A digital frequency measurement device comprising: a filter, where the filter receives an input RF signal and transmits an output signal centered around a desired frequency; a limiting amplifier downstream of the filter, where the amplifier receives and amplifies the output signal; a deserializer downstream of the amplifier that continuously samples the output signal from the limiting amplifier; and a digital frequency measurement processor (DFM), where the DFM receives data at a rate of 1/16 of the deserializer sample rate and transforms the data into multiples stages that are combined in order to produce an estimate of the input signal, where the DFM is implemented through a digital processing device, where the DFM comprises a Hilbert transform, a plurality of correlations, a means for creating a plurality of complex products for each correlation, a means to calculate in-phase data and quadrature data, a means to determine phase and frequency for each correlation and a means to resolve and combine the correlations to produce the estimate of the input signal and wherein said means to calculate in-phase data and quadrature data, includes deriving the in-phase data by taking every even sample and deriving the quadrature data from real data by a logical function that looks at the odd data around the desired sample.