Messerschmitt-boelkow-blohm Gesellschaft MIT Beschraenkter Haftung

Rupert Breithaupt

Fridbert Kilger

Gunter Zeifang

Jupp Menke

Siegfried Roth

In scanning an image field, for example an image field radiating infrared diation sensed by an infrared sensor, at least one, preferably two, electronically controlled scanners are used. The respective scanning directions extend perpendicularly relative to each other. Changes in these scanning directions are determined with the aid of a reference signal generator providing horizontal and vertical deviation signals with reference to a central or mean view direction. The central or mean view direction of at least one of the scanners, preferably of both scanners is then varied or corrected in a closed loop feedback circuit in response to the deviation signals so that the central or mean view direction is restored and maintained. Preferably, any horizontal or azimuth scanning deviation from the central or mean viewing direction is corrected by shifting the respective image points stored in a memory in a correction direction in response to the respective horizontal or azimuth deviation signal. The vertical or elevational scanning direction is corrected by correcting the drive signal for the vertical scanner in response to a respective vertical or elevational deviation signal.

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Egmating, Germany

Rupert Breithaupt