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arXiv 0710.4847math.PRcs.ITmath.ITmath.STstat.TH
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贝叶斯序贯变化诊断

Bayesian sequential change diagnosis

Savas Dayanik, Christian Goulding, H. Vincent Poor

摘要:

序列变化诊断是检测和识别随机序列分布中突然的、不可观测的变化的联合问题。在这个问题中,i.i.d.随机变量在某个无序时刻突然改变为众多选择中的一个。这个无序时间标志着一个新制度的开始,其指纹是新的观察定律。无序时间和新政权的身份都是未知和不可观测的。目的是尽快发现政权更迭,同时尽可能准确地确定其身份。及时和正确的诊断对于快速执行最适当的措施以应对新制度至关重要,例如工业过程中的故障检测和隔离,以及国防中的目标检测和识别。该问题是制定在贝叶斯框架。找到了一个最优的顺序决策策略,并描述了一个精确的数值方案,其实施。通过数值例子说明了该最优策略的几何性质。传统的贝叶斯变化检测和贝叶斯序贯多假设检验问题作为特例得到解决。此外,获得了一个解决方案的问题的检测和识别的组件故障(S)在一个系统与假死。

英文摘要:

Sequential change diagnosis is the joint problem of detection and identification of a sudden and unobservable change in the distribution of a random sequence. In this problem, the common probability law of a sequence of i.i.d. random variables suddenly changes at some disorder time to one of finitely many alternatives. This disorder time marks the start of a new regime, whose fingerprint is the new law of observations. Both the disorder time and the identity of the new regime are unknown and unobservable. The objective is to detect the regime-change as soon as possible, and, at the same time, to determine its identity as accurately as possible. Prompt and correct diagnosis is crucial for quick execution of the most appropriate measures in response to the new regime, as in fault detection and isolation in industrial processes, and target detection and identification in national defense. The problem is formulated in a Bayesian framework. An optimal sequential decision strategy is found, and an accurate numerical scheme is described for its implementation. Geometrical properties of the optimal strategy are illustrated via numerical examples. The traditional problems of Bayesian change-detection and Bayesian sequential multi-hypothesis testing are solved as special cases. In addition, a solution is obtained for the problem of detection and identification of component failure(s) in a system with suspended animation.

机构、总结、中文摘要均由AI分析而来,可能存在错误,请以论文正文为准。

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