Communications: directive radio wave systems and devices (e.g. – Aircraft collision avoidance system – With transponder
Patent
1995-07-17
1997-01-21
Sotomayor, John B.
Communications: directive radio wave systems and devices (e.g.,
Aircraft collision avoidance system
With transponder
342 32, 342 37, 342 40, 342 46, G01S 1387, G01S 1376
Patent
active
055963269
ABSTRACT:
A communication system is provided for identifying the position of aircraft in a surveillance area. The communication system includes a dual-frequency interrogator which produces two signals at different frequencies. These signals are transmitted over a narrow beam, scanning antenna, the antenna being located within the surveillance area. A transponder is provided on the aircraft with an auxiliary antenna assembly tuned to a frequency equivalent to the difference between the dual frequencies. The transponder produces a signal containing aircraft identification information. A processing unit is co-located on the aircraft with the transponder to receive the two signals transmitted by the interrogator and produce a signal equivalent to the difference between those signals. The difference signal produced by the processing unit is coupled with the transponder and is used to identify the position of aircraft on the ground. A stationary antenna and receiver are tuned to the frequency of the transponder response and receive the transponder response. The stationary receiver transmits information to a position-estimating computer regarding the time of arrival of the aircraft signal. The position-estimating computer also receives information from the interrogator regarding the time of interrogation and the position of the antenna at the interrogation time. The position-estimating computer processes this information to identify the position of the aircraft on the airport surface.
REFERENCES:
patent: 3714650 (1973-01-01), Fuller et al.
patent: 4364049 (1982-12-01), Moore et al.
patent: 4647931 (1987-03-01), Mawhinney
patent: 5001488 (1991-03-01), Joguet
patent: 5245346 (1993-09-01), Nishimura et al.
patent: 5400031 (1995-03-01), Fitts
Northrop Grumman Corporation
Sotomayor John B.
Sutcliff Walter G.
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