Device for the detection and elimination of unwanted images crea

Details Device for the detection and elimination of unwanted images crea Device for the detection and elimination of unwanted images crea

1985-08-28

1987-07-21

Jordan, Charles T.

Aeronautics and astronautics

Missile stabilization or trajectory control

Automatic guidance

F41G 726

Patent

active

046812822

ABSTRACT:
A device for the detection and elimination of unwanted images created by the pyramidal IR dome of an infra-red auto-director for a missile which is not roll-stabilized and the analysis of whose field has as its result, a succession of frames of period T. According to the invention, the levels of the frame of rank N-1 preceding any frame of rank N are stored in a frame memory, the levels at two points corresponding to the same geographical localization of the scene at an instant t and at the instant t-T are transmitted to the inputs of a differential detector, the absolute value of whose output level is compared with a threshold level. The output from the comparator provides a logic signal which is used to inhibit the taking into account of the unwanted image when the absolute value of the output level from detector is greater than the threshold value.

REFERENCES:
patent: 3064924 (1962-11-01), Fairbanks
patent: 3293437 (1966-12-01), Boydell
patent: 4244540 (1981-01-01), Vollmerhausen

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