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Finite-horizon scheduling of radar dwells with online template construction

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5 Author(s)
Gopalakrishnan, S. ; Dept. of Comput. Sci., Illinois Univ., Urbana, IL, USA ; Caccamo, M. ; Chi-Sheng Shih ; Chang-Gun Lee
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Timing constraints for radar tasks are usually specified in terms of the minimum and maximum temporal distance between successive radar dwells. We utilize the idea of feasible intervals for dealing with the temporal distance constraints. In order to increase the freedom that the scheduler can offer a high-level resource manager, we introduce a technique for nesting and interleaving dwells online while accounting for the energy constraint that radar systems need to satisfy. Further, in radar systems, the task set changes frequently and we advocate the use of finite horizon scheduling in order to avoid the pessimism that is inherent in schedulers that assume a task executes forever. We also develop the notion of modular schedule update which allows portions of a schedule to be altered without affecting the entire schedule, thereby simplifying the scheduler. Through extensive simulations, we validate our claims of providing greater scheduling flexibility without compromising on performance when compared with earlier work based on templates constructed offline.

Published in:

Real-Time Systems Symposium, 2004. Proceedings. 25th IEEE International

Date of Conference:

5-8 Dec. 2004

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