Aeronautics and astronautics – Missile stabilization or trajectory control – Automatic guidance
Patent
1991-09-23
1992-08-04
Jordan, Charles T.
Aeronautics and astronautics
Missile stabilization or trajectory control
Automatic guidance
F41G 726
Patent
active
051351838
ABSTRACT:
A birefringent prism (36) is disposed in front of the entrance aperture (26a) of a Cassegrain-type telescope (26) which constitutes the optical focussing assembly in a tracking system for a guided missile (10) or the like. The prism (36) refracts first radiation (O) having a first polarization in a first direction, and refracts second radiation (E) having a second polarization which is orthogonal to the first polarization in a second direction which is deviated from the first direction by a predetermined angle .DELTA..phi.. The telescope (26) focusses the first and second radiation (O,E) to form separate, laterally displaced first and second optical images (46,50) on first and second respective sections (34a,34b) of a focal plane photodetector array (34). Polarizing filters (56,58) which pass only the first and second polarizations therethrough are disposed in front of the respective sections (34a,34b) of the photodetector array (34) to eliminate optical crosstalk between the two images (46,50). Optical bandpass filters (54,52) having different wavelength passbands may also be provided in front of the two sections (34a,34b) of the photodetector array (34) such that the two images (46,50) constitute different color images of the scene (16).
REFERENCES:
patent: 3296443 (1967-01-01), Argyle
patent: 4028544 (1977-06-01), Jourdan et al.
patent: 4030686 (1977-06-01), Buchman
Brown C. D.
Denson-Low W. K.
Heald R. M.
Hughes Aircraft Company
Jordan Charles T.
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