Instrument landing system

Details Instrument landing system Instrument landing system

G - Physics

01

S

343/11

G01S 13/76 (2006.01) G01S 13/78 (2006.01) G01S 13/86 (2006.01)

Patent

CA 1267206

IMPROVED INSTRUMENT LANDING SYSTEM Abstract of the Disclosure In a single-frequency precision guidance landing system, the use of a DME interrogator (50) in the aircraft and a DME receiver (60) at the ground installation, each tuned to the same DME channel frequency, to uniquely interrogate a selected ground station (29,32,21,22,33,34) and hence identify it by virtue of its replies being synchronous in the aircraft (3,8) with the interrogations, the interrogations and the replies also being used to obtain range to the ground installation. This technique uses airborne already-installad DME interrogators (50) for selective interrogation of a desired landing installation (60,29,32), thereby to eliminate any need to add additional special purpose equipment to the aircraft to accomplish the desired uniqueness of interrogation and ground installation identification achieved by this invention.

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