Reference
OpenAI's Answer
The purpose of developing Terrain Following Radar (TFR) is to enable aircraft to fly at low altitudes while automatically maintaining a constant altitude above the ground. This capability allows them to navigate difficult terrains safely at high speeds. TFR is particularly useful in military operations, where low-level flight can help avoid radar detection.
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For more details, you can explore the topic further on Radartutorial.eu.
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