Direction determining method and apparatus

Details Direction determining method and apparatus Direction determining method and apparatus

1974-07-29

1976-07-20

Tubbesing, T.H.

Optics: measuring and testing

Angle measuring or angular axial alignment

With photodetection remote from measured angle

356 4, 356172, 33286, 33287, G01B 1126

Patent

active

039703916

ABSTRACT:
A direction finding system is disclosed in which a predetermined horizontal plane is established by the projection from one location of an image having illuminated and unilluminated portions corresponding to the predetermined horizontal plane. A receiver at a remote location detects the image at two spaced points amd produces an indication of the center of the transition zone between the illuminated and unilluminated portions of the projected image.

REFERENCES:
patent: 3046681 (1962-07-01), Kutzler
patent: 3471234 (1969-10-01), Studebaker
patent: 3588249 (1971-06-01), Studebaker
patent: 3588255 (1971-06-01), Alexander
patent: 3819273 (1974-06-01), Unema et al.

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