Communications: radio wave antennas – Antennas – Balanced doublet - centerfed
Patent
1977-04-29
1979-01-30
Wilbur, Maynard R.
Communications: radio wave antennas
Antennas
Balanced doublet - centerfed
343 171PF, G01S 942, G01S 730
Patent
active
041375327
ABSTRACT:
A low PRF pulse doppler radar system utilizing a VIP digital filter bank signal processor to suppress echoes from terrain, rain, and chaff, and pass echoes from aircraft moving at higher speeds is disclosed.
Each of a plurality of VIP filters individually provides high attenuation to undesired signals over designated frequency bands, the width of which are a large fraction of 1/T.sub.av where T.sub.av is the average interpulse period. Little or no attenuation of desired signals having doppler frequencies greater than 1/T.sub.av occurs. The outputs of the plurality of filters are desensitized to prevent false alarm from clutter, and the presence of a desired radar pulse echo is determined by a comparison with a threshold level.
REFERENCES:
patent: 3343162 (1967-01-01), Evans
patent: 3404399 (1968-10-01), Eschner, Jr.
patent: 3480953 (1969-11-01), Shreve
patent: 3560972 (1971-02-01), Taylor, Jr.
patent: 3566402 (1971-02-01), Taylor, Jr.
patent: 3787851 (1974-01-01), Hughes
patent: 4057800 (1977-11-01), Ganz
Martin Raymond G.
Taylor, Jr. John W.
Goodwin Lawrence
Patterson H. W.
Westinghouse Electric Corp.
Wilbur Maynard R.
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