Method and apparatus for passive airborne collision avoidance and navigation
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Abstract
A passive method for an aircraft to use its on-board locating apparatus to monitor interrogation signals and ISLS signals transmitted by at least one secondary surveillance radar, and coded reply signals transmitted by at least one fixed ground transponder; to match said transponder reply signals with said ISLS signals, in order to associate said transponder reply signals with interrogations from said radar; to repetitiously compute said aircraft'"'"'s instantaneous position in space, said computations being based on hyperbolic and linear functions related to said aircraft, said radar, and said associated fixed transponder; and to display said positions for navigational purposes. Furthermore, having said computations, said passive method uses said locating apparatus to monitor coded reply signals from transponders of other aircraft; to match said other-aircraft reply signals with said ISLS signals to determine which other-aircraft transponder reply signals are associated with interrogations from said radar; to repetitiously compute the instantaneous positions of other aircraft in space, said computations being based on elliptic and linear functions related to said locating apparatus'"'"' own aircraft, said other aircraft, and said radar; and to display said positions for collision-avoidance purposes.
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Specification
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Current AssigneeBennett Flax
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Original AssigneeBennett Flax
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InventorsFlax, Bennett
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Primary Examiner(s)Lall, Parshotam S.
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Assistant Examiner(s)Black, Thomas G.
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Application NumberUS06/769,701Time in Patent Office1,162 DaysField of Search364/460, 364/461, 364/449, 364/451, 364/452, 364/456, 342/39, 342/40, 342/37, 342/29, 342/30, 342/32US Class Current701/301CPC Class CodesG01S 13/781 Secondary Surveillance Rada...G01S 13/933 of aircraft or spacecraftG01S 5/12 by co-ordinating position l...
