Facsimile and static presentation processing – Facsimile – Specific signal processing circuitry
Patent
1979-07-23
1980-11-18
Rosenberger, Richard A.
Facsimile and static presentation processing
Facsimile
Specific signal processing circuitry
358 88, 358109, G02B 2717
Patent
active
042342414
ABSTRACT:
A 45.degree. rotary mirror illuminates a detector through an optical colling system and while facing downwards picks up a direct or primary line scan of objects located below in the plane of scanning. While facing upwards, the rotary mirror picks up a secondary line scan indirectly from below by reflection from a non-revolving plane mirror at an acute angle to the axis of rotation of the rotary mirror, which angle corresponds to the base angle of stereo scanning when the primary line scans are correlated with corresponding secondary line scans that respectively precede them by an interval corresponding to the travel time of the movable craft upon which the line scanner is carried along a base line distance determined by the inclination of the non-revolving plane mirror. That inclination is adjustable about a hinge axis perpendicular to the direction of travel of the carrying aircraft or spacecraft. The average angle of sight of scanned objects is adjustable in elevation and also, for drift compensation purposes, in azimuth. The laser of the heightfinding system can be incorporated into the scanner, directing its light to another 45.degree. mirror rotating back to back with the first, so that back-scattered laser light will be picked up by the scanner's detector to make possible calibration of the stereoscopic parameters, as well as showing the ground track on stereoscopic pictures produced by processing the detector output.
REFERENCES:
patent: 2988953 (1961-06-01), Barnett
patent: 3004464 (1961-10-01), Leighton et al.
patent: 3109057 (1963-10-01), Slavecki et al.
Deutsche Forschungs -und Versuchsanstalt fur Luft -und Raumfahrt
Rosenberger Richard A.
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