Radar altimeter Altimeter

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a radar altimeter measures altitude more directly, using time taken radio signal reflect surface aircraft. alternatively, frequency modulated continuous-wave radar can used. greater frequency shift further distance traveled. method can achieve better accuracy pulsed radar same outlay , radar altimeters use frequency modulation industry standard. radar altimeter used measure height above ground level during landing in commercial , military aircraft. radar altimeters component of terrain avoidance warning systems, warning pilot if aircraft flying low, or if there rising terrain ahead. radar altimeter technology used in terrain-following radar allowing fighter aircraft fly @ low altitude.



the altimeter on piper pa-28 seen on top row of instruments, second right







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