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Transponder (aeronautics)
A transponder (short-for ''trans''mitter-res''ponder'' and sometimes abbreviated to XPDR, XPNDR, TPDR or TP) is an electronic device that produces a response when it receives a radio-frequency interrogation. Aircraft have transponders to assist in identifying them on air traffic control radar; and collision avoidance systems have been developed to use transponder transmissions as a means of detecting aircraft at risk of colliding with each other.〔Peppler, I.L.: ''From The Ground Up'', pages 238–239. Aviation Publishers Co. Limited, Ottawa Ontario, Twenty Seventh Revised Edition, 1996. ISBN 0-9690054-9-0〕
Air traffic control units use the term "squawk" when they are assigning an aircraft a transponder code, ''e.g.'', "Squawk 7421". Squawk thus can be said to mean "select transponder code" or "squawking" to mean "I have selected transponder code xxxx".〔
==Secondary surveillance radar==
(詳細はpressure altitude and a 4-digit octal identifier.〔
抄文引用元・出典: フリー百科事典『 ウィキペディア（Wikipedia）』
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