Method and circuit for processing the signals of an earth-horizo

Details Method and circuit for processing the signals of an earth-horizo Method and circuit for processing the signals of an earth-horizo

1985-06-13

1987-05-12

Fields, Carolyn E.

Radiant energy

Invisible radiant energy responsive electric signalling

Infrared responsive

250342, 250347, 250351, G01J 134

Patent

active

046653147

ABSTRACT:
A method and a circuit for processing the signals of an earth-horizon sen of a circularly orbiting earth satellite. The earth-horizon sensor operates in the infrared range and includes, in the focal plane of an input lens, a chopper disk which is periodically reciprocated with a determined chopper frequency (f) and has a diameter corresponding to the image of the earth, as well as a detector (1) receiving the periodically interrupted light radiation of oppositely located earth rims. The output signal of the detector (1) is demodulated synchronously with the chopper frequency (f) in order to derive an off-course signal. In order to suppress the influence of the earth anomaly, the amplified output signal of the detector (1) is additionally synchronously demodulated with the doubled chopper frequency (2f), according to the invention, in order to produce a symmetry signal.

REFERENCES:
patent: 3486024 (1969-12-01), Astheimer
patent: 3551681 (1970-12-01), Astheimer
patent: 3714432 (1973-01-01), Jalink, Jr.
patent: 3920994 (1975-11-01), Cargille
Van Dijk, P., "The Horizon Sensor", Philips Tech. Rev. 34, No. 8, p. 213.

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