PURPOSE:To automatically discriminate an aircraft by a method wherein position information on an airport surface detection radar (ASDE) is correlated with discrimination information on the aircraft which has been discriminated by a direction finder. CONSTITUTION:When an aircraft 9 (a starting aircraft) parked at a spot in an airport starts to meve to a taxiway and enters the coverage region of an ASDE, its reflected waves are received by an ASDE receiver 23, and the sight of the aircraft is displayed on a radarscope. In addition, the sight is computer- processed in a position detector 24, and a precise distance up to the aircraft 9 is decided. When the aircraft 9 starts a call with a control tower 13, radio waves are radiated. The radio waves are received by direction finders 20 to 22 at three places, and a radio-wave source region is estimated. On the other hand, the call content of the aircraft 9 is input to a voice recognition device 25, and discrimination information on an airline name and a flight name is selected. The discrimination information, on the aircraft 9, which is decided in this manner and position information, from the position detector 24, which is obtained by the ASDE are correlated by a position correlation device 27.
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