Radio altimeter and terrain warning
8 min read
Radio altimeter
Measures the height above the ground by comparing the transmitted and reflected frequency of a radio signal (FMCW, 4.2–4.4 GHz), which gives the signal's travel time; used at low height, typically up to 2,500 ft. It feeds the CAT II/III decision height, autoland, height callouts and terrain warning.
IN THIS LESSON
- Terrain warning (GPWS / TAWS)
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