Frequency measuring circuit in a passive radar receiver

Details Frequency measuring circuit in a passive radar receiver Frequency measuring circuit in a passive radar receiver

1978-04-20

1980-02-12

Wilbur, Maynard R.

Communications: radio wave antennas

Antennas

Balanced doublet - centerfed

324 82, 324 83D, G01S 902

Patent

active

041886283

ABSTRACT:
Passive frequency measuring circuit comprising a number of frequency discriminators to obtain a digital code representing the frequency of an applied r.f. signal. Each discriminator is tuned to different frequency ranges, and provided with a plurality of similar frequency analysers for the phase detection of the applied r.f. signal passed through different delay lines. As each discriminator delivers an ambiguous code at the boundaries of its characteristic, a digital filter is incorporated to resolve the ambiguity. If such an ambiguity is established, an adjoining discriminator is activated to deliver information for obtaining a digital code representing an unambiguous frequency value.

REFERENCES:
patent: 3003107 (1961-10-01), Charbonnier
patent: 3189820 (1965-06-01), Lowman
patent: 3617900 (1971-11-01), Fink et al.
"Comment on Broadband Microwave Discriminator", by S. J. Robinson, IEEE Transactions on Microwave Theory and Techniques, vol. 12, Mar. 1964, pp. 255, 256.

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