Embedded real-time systems in cyber-physical applications: a frequency domain analysis methodology

被引:2
作者
Aciti, Claudio [1 ]
Cayssials, Ricardo [2 ,3 ]
Ferro, Edgardo [3 ]
Urriza, Jose [4 ]
Orozco, Javier [3 ]
机构
[1] Univ Nacl Ctr Prov Buenos Aires, Fac Cs Exactas, Tandil, Argentina
[2] Univ Tecnol Nacl, Fac Reg Bahia Blanca, Bahia Blanca, Buenos Aires, Argentina
[3] Univ Nacl Sur, Dept Ingn Elect & Comp, Bahia Blanca, Buenos Aires, Argentina
[4] Univ Nacl Patagonia San Juna Bosco, Dept Informat, Puerto Madryn, Argentina
关键词
Real-time systems; cyber-physical systems; frequency domain analysis;
D O I
10.1080/03081079.2019.1703701
中图分类号
TP301 [理论、方法];
学科分类号
081202 ;
摘要
Cyber-Physical Systems (CPSs) use sensors and actuators to interface between an embedded system and the physical world. The time-continuous domain of the physical world should be periodically sampled by real-time tasks in an embedded system to preserve its dynamic properties in the time-discrete domain. Because the task execution pattern may vary during runtime, a jitter in the execution of a real-time task hinders the periodicity of its execution. The effects of jitters in CPSs are difficult to determine when the premises of the Nyquist-Shannon sampling theorem are not satisfied. This paper proposes using frequency domain analysis to determine the perturbations that a real-time system produces on real-world applications; accordingly, the paper defines both a design and an evaluation criterion for real-time systems in CPS applications. The Fixed Priority discipline is analysed through simulations to conclude that no special design techniques are required when the utilization factors are less than 20%.
引用
收藏
页码:201 / 221
页数:21
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