| 摘要 |
A warning system and method for providing a warning to pilots of aircraft when out of radio contact with air traffic control, the system comprises: a ground station 3 which comprises a surveillance radar 5 for transmitting interrogation pulses to an aircraft, a control unit 9 for controlling operation of the surveillance radar; the control unit is operative to configure the interrogation pulse which is transmitted to the identified aircraft to include a warning code; and an airborne station which is fitted to the aircraft comprises a warning unit 19 for providing a visual and/or audible warning to the pilot, an input unit 7 for inputting an identification code such as a squawk code, a transponder 15 for receiving an interrogation pulse from the surveillance radar of the ground station and transmitting a reply pulse, which includes the identification code; a monitoring unit 17 for monitoring the interrogation pulse as received from the surveillance radar, the monitoring unit is operative to compare the warning code and the identification code, and based on a predetermined relationship there between, provide a warning to the pilot. |
