terrain-avoidance radar

terrain-avoidance radar

[tə′rān ə¦vȯid·əns ′rā‚där]
(navigation)
Airborne radar which provides a display of terrain ahead of a low-flying aircraft to permit horizontal avoidance of obstacles.

terrain-avoidance radar

terrain-avoidance radarclick for a larger image
The target spot represents the path with the aircraft should be following to clear the ground ahead by the required amount and the aiming mark is its present path. These representations are enlargements of head-up displays.
A special radar that permits aircraft to be flown safely at a preset clearance level. A normal PPI (plan position indicator) radar enables the terrain to be avoided in azimuth rather than in elevation. A specialist terrain avoidance radar, on the other hand, only displays terrain that penetrates above a preset clearance level.
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Once in the air, aircrews take maximum advantage of low-altitude flight profiles via the use of terrain-following and terrain-avoidance radars combined with the maximum use of terrain masking.