Device for estimating the operating frequency of a source of rec

Details Device for estimating the operating frequency of a source of rec Device for estimating the operating frequency of a source of rec

1982-06-24

1985-06-11

Malzahn, David H.

Boots, shoes, and leggings

364485, G06F 1531, G01R 2316

Patent

active

045232911

ABSTRACT:
A device for estimating the scanning frequency of an unfriendly tracking radar of the conically scanning type comprises input circuitry for eliminating the d-c component of a detected radar signal and a sampler deriving a train of amplitude pulses from that signal which, after digitization, are fed to a calculator performing a Fourier analysis thereon. The index of the term of the resulting Fourier series with the largest sum of the absolute values of its real and imaginary coefficients is selected and weighted with a corrective factor obtained from the numerical values of the coefficients of a limited number of preceding and succeeding terms in the series; the corrected index yields the estimated scanning frequency.

REFERENCES:
patent: 3803390 (1974-04-01), Schaepman
patent: 3989938 (1976-11-01), Auth
patent: 4093989 (1978-06-01), Flink et al.
patent: 4188628 (1980-02-01), Langeraar et al.
patent: 4234880 (1980-11-01), Klemm
patent: 4301404 (1981-11-01), Ley
patent: 4321680 (1982-03-01), Bertrand et al.
patent: 4408284 (1983-10-01), Kijesky et al.

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