Frequency measurement receiver with means to resolve two folding frequencies of complex signals

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The The United States Of America As Represented By The Secretary Of The Air Force patent solves the following problem:

The present invention relates generally to a digital frequency measuring receiver to resolve an ambiguity in many frequency estimation, and particularly in the way of resolving the two folding frequencies in complex signal.

Our analysis of this patent is as follows:

The United States Of America As Represented By The Secretary Of The Air Force’s patent US 5323103 A deals with Frequency measurement receiver with means to resolve two folding frequencies of complex signals.
This is an arrangement to find two folding frequency fold into a frequency bin, to save hardware. The input frequency is converted to I and Q channels. Each channel requires a pair (two) in the A / D converters. A total of three pairs of A / D converters needed. All three pairs of A / D converters SAME sampling frequency FS. There is a time delay before the second set of A / D converters, and 2 before the third pair. The outputs of the A / D converters FFT units followed by a signal processor used to seek input frequencies by solving the non-linear simultaneous equations.

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