Scanning horizon sensors using an inner and an outer radiation s

Details Scanning horizon sensors using an inner and an outer radiation s Scanning horizon sensors using an inner and an outer radiation s

1989-09-11

1992-03-10

Nelms, David C.

Radiant energy

Photocells; circuits and apparatus

Photocell controlled circuit

2502036, 250211J, 250347, H01J 4014

Patent

active

050951998

ABSTRACT:
Method and apparatus for accurately determining the horizon position of a celestial body is disclosed in the form of inner and outer detector portions arranged generally-concentrically relative to an optical axis. Difference-determining electrical circuitry determines a difference between the outputs of the two detectors.

REFERENCES:
patent: 3557369 (1971-01-01), Waban
patent: 4118622 (1978-10-01), David
patent: 4629882 (1986-12-01), Matsuda et al.
patent: 4654518 (1987-03-01), Astheimer
patent: 4792684 (1988-12-01), Savoca

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