Method of correcting errors in horizon sensors caused by radianc

Details Method of correcting errors in horizon sensors caused by radianc Method of correcting errors in horizon sensors caused by radianc

1986-12-09

1988-11-15

Howell, Janice A.

Radiant energy

Invisible radiant energy responsive electric signalling

Infrared responsive

250342, G01J 134

Patent

active

047851694

ABSTRACT:
A horizon sensor having a pair of adjacent infrared detectors which view the earth's horizon either statically or by scanning is provided with a second order radiance correction to reduce errors in determining the true position of the horizon due to radiance variations of the earth due to changes in latitude and seasons particularly at lower altitudes. The second order correction is empirically determined from a large number of horizon profiles, and in two illustrative examples for different types of sensors, the correction may be readily obtained from a linear function related to the peak radiance of the horizon profiles.

REFERENCES:
patent: 3486024 (1969-12-01), Astheimer
patent: 3551681 (1970-12-01), Astheimer
patent: 3714432 (1973-01-01), Jalink, Jr.
patent: 4665314 (1987-05-01), Haberl

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