초록 ▼

An integrated airport terminal area surveillance system, including a plurality of spaced apart interrogating and receiving stations and central equipment for controlling the stations operates in search and track modes by transmitting interrogation messages and receiving resulting replies. In the sea

An integrated airport terminal area surveillance system, including a plurality of spaced apart interrogating and receiving stations and central equipment for controlling the stations operates in search and track modes by transmitting interrogation messages and receiving resulting replies. In the search mode the stations interrogate by directional beams all aircraft operating within the entire terminal area and enrolling the position and identification of replying aircraft into a system memory. In the track mode those aircraft enrolled in the system memory are individually interrogated. A system map is divided into memory cells corresponding to predetermined geographical cells. The means by which an aircraft is interrogated is determined by the geographical cell in which the aircraft is located.

대표청구항 ▼

A surveillance system for an airport terminal control area including a plurality of spaced apart interrogating and receiving stations and wherein transponder equipped aircraft cooperate with said stations, said stations being able to direct an interrogation message into a selected portion of said te

A surveillance system for an airport terminal control area including a plurality of spaced apart interrogating and receiving stations and wherein transponder equipped aircraft cooperate with said stations, said stations being able to direct an interrogation message into a selected portion of said terminal control area and determine, in response to a reply to said interrogation message, the location of a transponder equipped aircraft which replies to said interrogation message by any of a plurality of algorithms for determining location in response to a reply to an interrogation and additionally including means for recording the location of said transponder equipped aircraft which replies to said interrogation message; and, means responsive to the recorded location for selecting which of said plurality of algorithms is to be used for determining the location of said aircraft in response to a subsequent reply.