Terrain-following radar is a military aerospace technology that enables aircraft to fly at very low altitudes, maintaining a constant distance above the ground. This low-level flight helps the aircraft use the surrounding terrain to mask its presence, thus making it more difficult for enemy radar systems to detect and track the aircraft. By flying between hills, mountains, and through valleys, aircraft can minimize their radar cross-section and avoid detection.
For example, systems like the "Silent Knight" radar used by the U.S. Special Operations Command are specifically designed to enhance situational awareness while reducing the probability of detection and interception by enemy radar (AFCEA International, Wikipedia).
This capability is particularly useful in stealth and covert operations, allowing aircraft to approach targets undetected by utilizing the natural cover provided by the terrain.
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