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The radio altimeter has many names: radar altimeter, electronic altimeter and reflection altimeter.

The radio altimeter has many names: radar altimeter, electronic altimeter and reflection

altimeter.
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Three main parts of the radio altimeter are: transmitter, receiver and height indicator

Three main parts
of the radio altimeter are: transmitter,
receiver and
height

indicator
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Use in civil aviation In civil aviation, radio altimeters are used

Use in civil aviation

In civil aviation, radio altimeters are used to

accurately determine flight altitude and safe approach in difficult weather conditions, when the barometric altimeter has a large error.  

The radio altimeter is also used in the crew alert system for dangerous approach to the ground.

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Use in Military Aviation In military aviation, radio altimeters are used

Use in Military Aviation

In military aviation, radio altimeters are used in

aiming systems for dropping bombs and systems of flight with a circumflex of terrain