terrain-following system

terrain-following system

terrain-following systemclick for a larger image
The target spot represents the path the aircraft should be following to clear the ground ahead by the required amount and the aiming mark is its present path.
A system that provides the pilot or autopilot of an aircraft with climb or descend signals so that the aircraft will maintain, as closely as possible, a selected height above a ground contour in a vertical plane through the flight vector. The system enables the aircraft to follow closely all ground contours during elevation.
An Illustrated Dictionary of Aviation Copyright © 2005 by The McGraw-Hill Companies, Inc. All rights reserved
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Basically, the LANA system is based on a FLIR pod and an automatic terrain-following system. The former forwards to the crew's Head-Up Display a night-time target picture as clearly as if it were a daylight scene.