Communications: radio wave antennas – Antennas – Balanced doublet - centerfed
Patent
1974-11-20
1977-04-26
Wilbur, Maynard R.
Communications: radio wave antennas
Antennas
Balanced doublet - centerfed
324 78D, 324 79D, 331 14, G01S 944, G01R 2314
Patent
active
040204901
ABSTRACT:
Apparatus is provided for determining the frequency of unknown periodic input signals and primarily generally sinusoidal signals which may be accompanied by substantial noise. More particularly a unique traffic radar or doppler radar is provided employing such frequency measuring apparatus. The apparatus includes a phase locked loop in which a frequency multiplier effect is produced and in which a frequency 12 times the periodic input signal being subjected to measurement is employed for taking two independent samples of the input signal and providing a synthetic representation of that signal. The two samples are centered about quadrature time references and are preferably conterminous. This signal can be measured and utilized for speed measuring purposes and other purposes where the accurate measurement of a periodic signal accompanied by noise is desired. The system includes two sampling gates to control the frequency of a variable controlled oscillator in a manner which accurately matches the oscillator output to a harmonic of the input and selects portions thereof to eliminate harmonic ambiguities. Circuit means is also provided for signal verification and for improved long-term noise rejection by utilizing variable time constants.
REFERENCES:
patent: 3077594 (1963-02-01), McKay et al.
patent: 3438031 (1969-04-01), Fathauer
patent: 3594655 (1971-07-01), Reisfeld
patent: 3715751 (1973-02-01), Mead
patent: 3721977 (1973-03-01), Darboven
patent: 3885238 (1975-05-01), Klein et al.
Buczinski S. C.
Decatur Electronics Inc.
Wilbur Maynard R.
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