optical horizon

optical horizon

[′äp·tə·kəl hə′rīz·ən]
(geodesy)
Locus of points at which a straight line from the given point becomes tangential to the earth's surface.
References in periodicals archive ?
The research concerns the use of this recognition algorithm for the development of an optical horizon sensor.
The aircraft navigation algorithm is based on optimal error estimation of the subsystems, such as SINS, GPS receiver, an optical horizon sensor, and a magnetometer.
The optical horizon sensor and magnetometer integration decreases the SINS vertical line analytical modelling errors [DELTA][[phi].