A type of aviation navigation aid, it is a device that allows an aircraft in flight to know the distance between itself and a ground station. It is also called DME. An interrogator installed on an aircraft transmits an interrogation pulse radio wave, and a transponder at the ground station receives it, measuring the time of the response pulse radio wave that is transmitted, converting it into distance and displaying it on an instrument. Recently, however, a method using GPS (Global Positioning System) using artificial satellites has come into widespread use to know an aircraft's own position, destination, and the distance to target points along the way. (→ Navigation ) Source: Encyclopaedia Britannica Concise Encyclopedia About Encyclopaedia Britannica Concise Encyclopedia Information |
航空用航法援助方式の一種で,飛行中の航空機が地上局との間の距離を知る装置。 DMEともいう。航空機に搭載される質問器が質問パルス電波を発信し,それを受けた地上局の応答器 (トランスポンダ) が発信する応答パルス電波の時間を測定し,距離に換算して計器に示す。最近は,しかし,人工衛星を利用した GPS (全地球測位システム) によって,航空機の自分の位置や目的地,途中の目標地点までの距離を知る方法が多く使われている。 (→航法 )
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