PROBLEM TO BE SOLVED: To reduce the overlap of response signals from an airplane and to monitor the airplane quickly and surely. ;SOLUTION: By following the departure/arrival estimated time of an airplane supplied from a flight-plan information processor (FDP), a controller 12 generates a beam control signal by which the beam of an antenna device in a TX/RX station 1 and that in an RX station 2 are directed to the airplane, and the beam control signal is transmitted to the TX/RX station 1 and the RX station 2. In addition, by following the departure/arrival estimated time, a transmission control signal is transmitted to the TX/RX station 1. A transmission part in the TX/RX station 1 generates an SSR question signal by following the transmission control signal so as to be transmitted from the antenna device. SSR response signals which are received by the TX/RX station 1 and the RX station 2 are transmitted to a processing/integrating part 13 via a transmission part 11. By a correlation with position information from an airport-face detecting radar apparatus (ASDE), display data by which a discimination number is given to position information on the airplane is generated so as to be supplied to, and displayed on, a display part 14.;COPYRIGHT: (C)2000,JPO
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