Photoelectric direction finder

Details Photoelectric direction finder Photoelectric direction finder

1979-11-20

1981-09-01

Nelms, David C.

Radiant energy

Photocells; circuits and apparatus

Photocell controls its own optical systems

356152, G01J 120

Patent

active

042874122

ABSTRACT:
A photoelectric direction finder in which the modulating and spatial filtering functions produced by the reticles are separated from the deviation measurement function resulting from a four quadrant detection, provided with a view to permitting a passive or semi-active bimodal operation. The reticles are determined transparent for the radiation emmited by an auxiliary laser illuminator modulated according to a modulation different from that provided by the reticles in the passive mode, while the processing and deviation measurement circuits have additional laser signal demodulation circuits and automatic or priority mode selection and switching circuits.

REFERENCES:
patent: 4112294 (1978-09-01), Pressiat
patent: 4129775 (1978-12-01), O'Meara
patent: 4134008 (1979-01-01), De Corlieu

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