Pulse or digital communications – Receivers
Patent
1997-11-05
2000-02-29
Chin, Stephen
Pulse or digital communications
Receivers
375324, 375325, 36472501, 36472603, 370210, 324 7621, 324 7622, H03K 900, H04L 2706, H04L 2714, H04L 2722
Patent
active
060318791
ABSTRACT:
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 f.sub.si 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 m.sub.i =(f.sub.si)(T.sub.Li) where T.sub.Li is the integration time for the discrete Fourier transform for each digital processing channel. The lengths of the Fourier spectra (m.sub.i) 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-to-decimal algorithm is then applied to the detected bin values (a.sub.i) to determine the numerical value of the frequency f of the analog waveform. The receiver resolves all undersampling ambiguities exactly, thereby relaxing the speed requirements on the digital section of the receiver.
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W. McCormick, J. B. Y. Tsui, V. L. Bakke, "A Noise INsensitive Solution to n Ambiguity Problem in Spectra Estimation," IEEE Transactions on Aerospace and Electronic Systems, Sep. 1989, vol. 25, No. 5, pp. 729-732, Sep. 1989.
W. McCormick, D. F. Miller, J. B. Y. Tsui, "Resolution of a 2-Pi Ambiguity Problem in Multiple Frequency Spectral Estimation," IEEE Transactions on Aerospace and Electronic Systems, Sep. 1989, vol. 31, No. 1, pp. 2-8, Sep. 1989.
Leino Richard E.
Pace Phillip E.
Styer David
Chin Stephen
Lincoln Donald E.
Maddox Michael W.
The United States of America as represented by the Secretary of
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