Communications: radio wave antennas – Antennas – Balanced doublet - centerfed
Patent
1981-09-28
1985-08-27
Cangialosi, Sal
Communications: radio wave antennas
Antennas
Balanced doublet - centerfed
343 18E, G01S 736, G01S 1334
Patent
active
045381488
ABSTRACT:
A coherent radar including separate transmitting and receiving chains. The transmitting chain includes a master oscillator providing a signal at frequency F0. A multiplier multiplies F0 by a predetermined amount to produce a signal at a frequency F1. A second multiplier multiplies the signal at frequency F1 to produce a signal at frequency F2, F1 and F2 being coherent with F0. A first mixer mixes F1 with F0 and a second mixer mixes F2 with the product of the first mixer to produce a transmission signal. In the receiving chain, a received signal is amplified and filtered and then mixed in a third mixer with the second signal at frequency F2 from the transmitting chain. The mixing product of the third mixer is amplified and filtered and mixed in a fourth mixer with the first signal. The fourth mixer product is then coupled to a processor for producing a radar display.
REFERENCES:
patent: 3121868 (1964-02-01), Hausz et al.
patent: 3163862 (1964-12-01), Jenny
patent: 3713153 (1973-01-01), van Popta
patent: 3725917 (1973-04-01), Sletten et al.
patent: 4142189 (1979-02-01), Gleason
patent: 4271412 (1981-06-01), Glass et al.
patent: 4342998 (1982-08-01), Easter
patent: 4379295 (1983-04-01), Lewis et al.
Gary Blake Jordan, "Comparison of Two Major Classes of Coherent Pulsed Radar Systems", May 1975, vol.-AES-11, No. 3, pp. 363-371, (IEE Transactions on Aerospace and Electronic Systems).
Marchand Maurice
Petitjean Christian
Barron Jr. Gilberto
Cangialosi Sal
LMT Radio Professionnelle
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