Single sampler heterodyne method for wideband frequency measurem

Details Single sampler heterodyne method for wideband frequency measurem Single sampler heterodyne method for wideband frequency measurem

1977-07-15

1979-01-16

Atkinson, Charles E.

Boots, shoes, and leggings

235 92FQ, 324 79D, 328134, G01R 2314

Patent

active

041352432

ABSTRACT:
An input signal of unknown frequency is applied to a sampler which is driven by a sampling signal of frequency f.sub.O to produce an intermediate signal of frequency f.sub.IF. The sampling frequency f.sub.O varies in response to a randomly, or pseudo-randomly varying signal which in turn causes the signal of frequency f.sub.IF to also vary. f.sub.IF will vary in the same way as f.sub.O, but with a scale factor of .+-. N, where N is the harmonic number. Correlation techniques are used to determine the harmonic number and the sideband to enable calculation of the input frequency. Errors in the determination of the harmonic number and sideband due to frequency modulation of the input signal are reduced, due to the variation imposed on the sampling frequency f.sub.O.

REFERENCES:
patent: 2896162 (1959-07-01), Berger et al.
patent: 3403338 (1968-09-01), Martin
patent: 3750014 (1973-07-01), Gaw, Jr.
patent: 3838338 (1974-09-01), Khoury
patent: 3984770 (1976-10-01), Chu
patent: 3991365 (1976-11-01), Takeuchi
Boff, "Frequency Meter Uses Digital Counters", Electronics, Jun. 1954, pp. 189-191.

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