Method of multipath track reduction in an aircraft tracking syst

Details Method of multipath track reduction in an aircraft tracking syst Method of multipath track reduction in an aircraft tracking syst

1990-09-20

1992-04-21

Sotomayor, John B.

Communications: directive radio wave systems and devices (e.g.,

Air traffic control

342 37, 342 32, 342451, 342455, G01S 1380, G01S 1386

Patent

active

051072688

ABSTRACT:
In a Traffic Alert and Collision Avoidance System (TCAS), response to interrogations can result in normal, multipath (image), and mixed multipath (potential image) tracks. The method for reducing the number of false tracks includes the steps of selecting a track to be updated from an existing track list. The selected track has the shortest measured range within the highest priority category track. A reply which has not yet been utilized is selected which has parameters which are within predetermined windows of the selected track parameters. (The predetermined windows are equal to or smaller than the windows for lower priority targets.) The selected track is updated using .alpha..beta..gamma. range squared filter, and the selected reply is marked as used. After all tracks are updated, the unused replies are tested to generate new tracks. Then all the tracks are examined to insure that predetermined track category criteria are met, otherwise the track is recategorized.

REFERENCES:
patent: 4789865 (1988-12-01), Litchford
patent: 4816833 (1989-03-01), Ferguson et al.
patent: 4970518 (1990-11-01), Cole, Jr.

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