Radar/radio altimeters measure absolute terrain clearance by transmitting frequency-modulated continuous-wave (FMCW) RF signals and computing the round-trip propagation delay, covering LRU assemblies that integrate transceiver modules, directional antenna arrays, signal processing ASICs, and ARINC 552/707-compliant interfaces used in low-range radio altimeter (LRRA) and ground proximity applications.
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