Enhanced Performance Capability in a Dual Redundant Avionics Platform – Fault Tolerant Scheduling with Comparative Evaluation

Abstract

For mission critical applications like Avionics, dependability is to avoid consequences of catastrophic results. Traditionally fault tolerance is implemented using hardware redundancy, the higher the redundancy, greater the cost and possibilities of more failures occurring. In this paper, an adaptive fault tolerant scheduling mechanism developed earlier with augmented performance capability and online fault recovery for a dual redundant system has been extended for an avionics mission system. An algorithm has been developed, simulated and evaluated on the practical case study vis -a-vis a traditional dual redundant system. This paper also roposes an extension of earlier scheme to schedule arrival of either/and critical and non -critical aperiodic tasks. The augmented scheme helps to achieve full functionality when no fault occurs, a fail safe mechanism for a single fault and performance metrics highlights the better computational performance. It elucidates that the use of this adaptive model leverages better in terms of enhanced performance and throughput compared to the existing dual redundant systems.

Boosted System Performance based on Execution Time Using LiMca Scheduling Algorithm

“…Real-time control is essential to meet the requirements for different applications like aircraft, manufacturing, information processing systems, etc. The aeronautics mission system is one of the most real-time embedded systems to sense the various parameters with multiple sensors [10]. The system's functionality will depend on the type and length of the tasks along with their dependencies.…”

“…Criticalities of tasks have supported the consequences in a system based on the needs. Thirty three seconds taken by using Enhanced Fault Tolerant Scheme (EDFS) on two processors as compared to the dual redundant system (DRS) [10]. In a List scheduling algorithm, tasks arranged based on different strategies like List, earliest completion time (ECT), earliest starting time (EST), shortest processing time (SPT), and longest processing time (LPT) patterns.…”

Study on formal modeling and verification of safety computer platform

“…The feasibility and validity were proved by the results of laboratory testing. Sreekumar et al 20 developed an adaptive fault-tolerant scheduling mechanism for a dual redundant avionics mission system. The augmented scheme could achieve full functionality when no fault occurs, as well as providing a fail-safe mechanism for a single fault.…”