Sperry Marine Inc.

Dale W Jessen

Mark J Baginski

Michael A Starr

Ernest S Gasser

Jerald E Archambault

Thomas E Wood

Peter J Klotz

A beam sharpened, low sidelobe antenna is obtained by segmenting the antenna to provide two sub-antennas, one of which is arranged as an interferometer. The output signals of the two antennas are added and subtracted to provide sum and difference signals. The sum and difference signals and the output signals are then utilized to provide the desired beam sharpened, low sidelobe antenna.

Beam sharpened, low sidelobe antenna system

A threshold setting circuit receives a signal coupled to the signal terminal of a comparator, delays then amplifies the signal and couples the delayed-amplified signal through a switch to the threshold signal terminal of the comparator. Prior to the reception of a signal which exceeds the threshold, the threshold level is set at the amplified noise level which is stored in storage means coupled to the threshold signal terminal. When the signal exceeds the amplified noise level, the switch is opened prior to the time that the delayed amplified signal is coupled to the threshold signal terminal and stored with the amplified noise in the storage means. Sometime after the signal ceases to exceed the amplified noise threshold level the switch is closed and the storage means tracks the amplified noise to maintain a current threshold level.

Method and apparatus for establishing a threshold with the use of a

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Charlottesville, VA, United States of America

Dale W Jessen