Method of processing the output signals of an optical earth-hori

Details Method of processing the output signals of an optical earth-hori Method of processing the output signals of an optical earth-hori

1985-06-13

1987-06-09

Church, Craig E.

Radiant energy

Invisible radiant energy responsive electric signalling

Infrared responsive

250342, 250347, 250351, G01J 134

Patent

active

046722050

ABSTRACT:
The invention is directed to a method for determining the anomaly portion the output signal of a zero-seeking earth-horizon sensor for a geostationary satellite. The horizon sensor comprises a chopper disk operated with constant frequency, which chopper disk pictures the image of oppositely located earth horizons on a common infrared detector. When the thermal radiation of the two earth horizons is different the anomaly portion contained in the detector output signal can be determined in that the off-course signals are measured for different amplitudes of the chopper disk. Since the anomaly-dependent portion in the detector output signal depends on this chopper amplitude, correcting amounts can be determined for the measured values corresponding to the anomaly portion.

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

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