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报告编号	NASA-CR-174168, NAS 1.26:174168
来源ID	NTRS_Document_ID: 19850005169
	A unified method for evaluating real-time computer controllers: A case study. [aircraft control]
	Shin, K. G.; Krishna, C. M.; Lee, Y. H.
英文摘要	A real time control system consists of a synergistic pair, that is, a controlled process and a controller computer. Performance measures for real time controller computers are defined on the basis of the nature of this synergistic pair. A case study of a typical critical controlled process is presented in the context of new performance measures that express the performance of both controlled processes and real time controllers (taken as a unit) on the basis of a single variable: controller response time. Controller response time is a function of current system state, system failure rate, electrical and/or magnetic interference, etc., and is therefore a random variable. Control overhead is expressed as a monotonically nondecreasing function of the response time and the system suffers catastrophic failure, or dynamic failure, if the response time for a control task exceeds the corresponding system hard deadline, if any. A rigorous probabilistic approach is used to estimate the performance measures. The controlled process chosen for study is an aircraft in the final stages of descent, just prior to landing. First, the performance measures for the controller are presented. Secondly, control algorithms for solving the landing problem are discussed and finally the impact of the performance measures on the problem is analyzed.
英文关键词	AIRCRAFT CONTROL COMPUTER SYSTEMS PERFORMANCE CONTROLLERS FLIGHT CONTROL NUMERICAL CONTROL REAL TIME OPERATION AIRCRAFT LANDING MULTIPROCESSING (COMPUTERS) PERFORMANCE PREDICTION RESPONSE TIME (COMPUTERS)
出版年	1982
报告类型	Technical Report
语种	英语
国家	美国
URL	http://hdl.handle.net/2060/19850005169
资源类型	科技报告
条目标识符	http://119.78.100.177/qdio/handle/2XILL650/258908
推荐引用方式 GB/T 7714	Shin, K. G.,Krishna, C. M.,Lee, Y. H.. A unified method for evaluating real-time computer controllers: A case study. [aircraft control],1982.