Process for en route aircraft conflict alert determination and prediction
Patent 4839658 Issued on June 13, 1989. Estimated Expiration Date: 
July 28, 2006. Estimated Expiration Date is calculated based on simple USPTO term provisions. It does not account for terminal disclaimers, term adjustments, failure to pay maintenance fees, or other factors which might affect the term of a patent.
July 28, 2006. Estimated Expiration Date is calculated based on simple USPTO term provisions. It does not account for terminal disclaimers, term adjustments, failure to pay maintenance fees, or other factors which might affect the term of a patent.Patent References 3808598 Satellite-based vehicle position determining system Collision avoidance apparatus Patent #: 4623966 InventorsApplicationNo. 06/891435 filed on 07/28/1986US Classes:342/455, Having collision avoidance342/29, AIRCRAFT COLLISION AVOIDANCE SYSTEM (CAS)342/30, With transponder701/301Collision avoidanceExaminersPrimary: Blum, Theodore M.Assistant: Cain, David Attorney, Agent or FirmInternational ClassesG08G 5/00 (20060101)G08G 5/04 (20060101) AbstractA process is provided for establishing when selected pairs of airborne aircraft are in en route conflict or are in potential en route conflict. The process includes a number of "filtering" steps arranged in three branches. At each step, different conditions, such as height separation, lateral separation, height convergence, lateral convergence and "look-ahead" projections are examined for each aircraft pair. Criteria are established for each "filtering" step such that aircraft pairs not passing the filter to the next step are exited as either "no conflict", "current conflict" as "potential conflict". Sixteen such filtering steps are provided, one of which establishes a "current conflict" status and four of which establish a "potential conflict" status.Other References
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