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arXiv 0812.3742cs.ITmath.ITmath.STstat.TH
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传感器阵列上马尔可夫过程的最快变化检测

Quickest Change Detection of a Markov Process Across a Sensor Array

Vasanthan Raghavan, Venugopal V. Veeravalli

摘要:

最近的注意力在多传感器设置中的最快变化检测一直在观察的密度在所有传感器由于中断而在同一时刻改变的情况下。在这项工作中,一个更一般的情况下被认为是在传感器的变化传播,其传播可以建模为马尔可夫过程。一个集中的,贝叶斯版本的这个问题,与融合中心,具有完善的信息的观测和先验知识的变化过程的统计,被认为是。最小化平均检测时延的问题,虚警约束制定为部分可观测马尔可夫决策过程(POMDP)。洞察的最佳停止规则的结构。在限制的情况下,罕见的中断,我们表明,结构的最佳测试减少到阈值的后验概率的假设,没有发生变化。我们建立的渐近最优性(在消失的虚警概率制度)的阈值测试在一定条件下的Kullback-Leibler(KL)的分歧后,和前的变化密度。在传感器上的近瞬时变化传播的特殊情况下,该条件降低到K-L发散为正的温和条件。数值研究表明,这种低复杂度阈值测试的结果在一个天真的测试,如一个单一的传感器测试或测试,错误地假设的变化瞬间传播的性能有很大的改善。

英文摘要:

Recent attention in quickest change detection in the multi-sensor setting has been on the case where the densities of the observations change at the same instant at all the sensors due to the disruption. In this work, a more general scenario is considered where the change propagates across the sensors, and its propagation can be modeled as a Markov process. A centralized, Bayesian version of this problem, with a fusion center that has perfect information about the observations and a priori knowledge of the statistics of the change process, is considered. The problem of minimizing the average detection delay subject to false alarm constraints is formulated as a partially observable Markov decision process (POMDP). Insights into the structure of the optimal stopping rule are presented. In the limiting case of rare disruptions, we show that the structure of the optimal test reduces to thresholding the a posteriori probability of the hypothesis that no change has happened. We establish the asymptotic optimality (in the vanishing false alarm probability regime) of this threshold test under a certain condition on the Kullback-Leibler (K-L) divergence between the post- and the pre-change densities. In the special case of near-instantaneous change propagation across the sensors, this condition reduces to the mild condition that the K-L divergence be positive. Numerical studies show that this low complexity threshold test results in a substantial improvement in performance over naive tests such as a single-sensor test or a test that wrongly assumes that the change propagates instantaneously.

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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