Communications: radio wave antennas – Antennas – Balanced doublet - centerfed
Patent
1981-05-22
1984-03-27
Wilbur, Maynard R.
Communications: radio wave antennas
Antennas
Balanced doublet - centerfed
343 175, G01S 944
Patent
active
044397666
ABSTRACT:
A microwave radar signal is generated (12) for transmission through an antenna (20). Before transmission, the signal is phase modulated (18) by 0.degree. or 90.degree. amounts during each alternate half-cycles of an intermediate frequency (IF) clock signal (26). After transmission and return, the signal is again phase modulated (18) the same amounts during each alternate half-cycles. The return phase modulated signal is mixed (24) with a leakage signal component of the microwave signal, leaving an IF doppler. The IF doppler signal may then be amplified (30), removing any requirement that direct current level signals be amplified and also removing the effect of detector noise from the doppler signal.
REFERENCES:
patent: 2991471 (1961-07-01), Pritchard
patent: 3388398 (1968-06-01), Kratzer et al.
patent: 3634860 (1972-01-01), Rittenbach
patent: 3750171 (1973-07-01), Faris
patent: 3750172 (1973-07-01), Tresselt
patent: 4019185 (1977-04-01), Morgan
patent: 4042925 (1977-08-01), Albanese et al.
patent: 4184154 (1980-01-01), Albanese et al.
patent: 4241347 (1980-12-01), Albanese
Kobayashi Herbert S.
Rozas Patrick
Shores Paul W.
Gordon M.
Manning John R.
Matthews Marvin F.
The United States of America as represented by the Administrator
Wilbur Maynard R.
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