Abstract
This paper investigates techniques to enhance the continuity of operations of the enroute air traffic control system. First the issues of software reliability and fault tolerance in realtime systems are discussed. Next, a list of problems associated with nonstop operations of flight dataprocessing (FDP) subsystem of the enroute air traffic control system are assumed, based on limited knowledge of the system; and possible solutions are suggested and analyzed. Implementation issues of recovery block scheme such as architecture, design of alternates and acceptance tests, and cost vs. reliability are studied. Four architectures of recovery block scheme are analyzed, and results of a simulation study using flight data processing subsystem as a test case are discussed.
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