Communications: directive radio wave systems and devices (e.g. – Radar ew – Eccm
Patent
1981-03-18
1994-10-25
Barron, Jr., Gilberto
Communications: directive radio wave systems and devices (e.g.,
Radar ew
Eccm
342149, 342383, 342384, G01S 736, G01S 1344
Patent
active
053593294
ABSTRACT:
A system for cancelling jammer signals entering the mainlobe of a monopulse adar and providing target locations with respect to the jammer position comprising for a sequential lobing embodiment: measuring the angular position of the jammer in the radar's mainlobe via the use of monopulse sum and difference signals, pointing the radar antenna so that the jammer is positioned within the 3 dB points of the mainlobe of the monopulse antenna, converting the sum and difference echo signals received with the antenna in this position from the next radar transmission into a second set sum and difference signals, applying this second set of sum and second set of difference signals to the inputs of an adaptive canceller to cancel the jamming signal therein and storing these signals in time sequential order, changing the orientation of the radar antenna by a small arbitrary elevation angle, converting the sum and difference echo signals received with the antenna in this new position from a third radar transmission into a third set of sum and difference signals, applying this third set of sum signals and third set of difference signals in reverse order relative to the second set of signals to the inputs of an adaptive canceller to cancel the jamming signal therein, reading out the adaptively cancelled stored echo signals from the second radar transmission into one input of a divider in time coincidence with the application of the adaptively cancelled echo signals from the same targets from the third radar transmission to the other input of the divider to obtain ratio signals proportional to the elevation angle separating the individual targets from the jammer.
REFERENCES:
patent: 3710390 (1973-01-01), Kreinheder
patent: 3838423 (1974-09-01), DiMatteo
patent: 3947848 (1976-03-01), Carnaham et al.
patent: 4010469 (1977-03-01), Marcum
patent: 4042927 (1977-08-01), Helms
patent: 4051474 (1977-09-01), Mack et al.
patent: 4086592 (1978-04-01), Lewis et al.
patent: 4213130 (1980-07-01), Vaessen
patent: 4214244 (1980-07-01), McKay et al.
Kretschmer, Jr. Frank F.
Lewis Bernard L.
Barron Jr. Gilberto
McDonnell Thomas E.
The United States of America as represented by the Secretary of
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