Wideband Undersampling Digital Receiver

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Author
Pace, Phillip E.
Leino, Richard E.
Styer, David
Date
2000-02-29Metadata
Show full item recordAbstract
An antenna receives an analog waveform and an analog
signal indicative of the amplitude and frequency of the
analog waveform. The analog signal is processed in a
plurality of parallel digital processing channels each
arranged to digitize the analog signal at a corresponding
sampling frequency fsi to produce a plurality of digital
signals. A discrete Fourier transform is applied to each of the
digital signals output to produce a corresponding plurality of
unique Fourier spectra of length mi=(fs;)(TL;) where TLi is
the integration time for the discrete Fourier transform for
each digital processing channel. The lengths of the Fourier
spectra (m;) are selected to be pairwise relatively prime. The
discrete Fourier transform encodes the signals in same form
as the symmetrical number system (SNS). A SNS-todecimal
algorithm is then applied to the detected bin values
(a;) to determine the numerical value of the frequency f of
the analog waveform. The receiver resolves all undersampiing
ambiguities exactly, thereby relaxing the speed
requirements on the digital section of the receiver.
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This publication is a work of the U.S. Government as defined in Title 17, United States Code, Section 101. Copyright protection is not available for this work in the United States.Collections
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