G - Physics – 01 – S
Patent
G - Physics
01
S
340/124.4
G01S 3/78 (2006.01) G01C 3/08 (2006.01)
Patent
CA 1308179
ABSTRACT OF THE DISCLOSURE A device for the selective detection of objects, such as aircraft, missiles and helicopters, by means of rays from the objects, preferably IR-rays, comprises at least one sensor unit. The device comprises at least two optical entrances at a distance relative to each other across a sight line from the device to the object. The sensor unit comprises at least one focusing means for focusing the rays to a focal plane. The sensor unit is equipped with at least one radiation-sensitive detector element arranged to emit signals corresponding to the radiation. The device is arranged to variably scan an angular field in azimuth and/or elevation. The device further comprises an evaluation unit arranged to receive said signals. The evaluation unit is arranged to select objects which seem to be of similar size with regard to the angle measured from the position of the device, large objects being at a greater distance, such as aircraft, and small objects being at a small distance, such as birds, by sup- pressing signals whose amplitude as a function of the scanned azimuth or elevation angle shows a relatively great extension compared with signals which show a relatively small extension.
586345
Marks & Clerk
Saab Missiles Aktiebolag
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