405,424 research outputs found
Reconfiguration of Distributed Information Fusion System ? A case study
Information Fusion Systems are now widely used in different fusion contexts,
like scientific processing, sensor networks, video and image processing. One of
the current trends in this area is to cope with distributed systems. In this
context, we have defined and implemented a Dynamic Distributed Information
Fusion System runtime model. It allows us to cope with dynamic execution
supports while trying to maintain the functionalities of a given Dynamic
Distributed Information Fusion System. The paper presents our system, the
reconfiguration problems we are faced with and our solutions.Comment: 6 pages - Preprint versio
On the genericity properties in networked estimation: Topology design and sensor placement
In this paper, we consider networked estimation of linear, discrete-time
dynamical systems monitored by a network of agents. In order to minimize the
power requirement at the (possibly, battery-operated) agents, we require that
the agents can exchange information with their neighbors only \emph{once per
dynamical system time-step}; in contrast to consensus-based estimation where
the agents exchange information until they reach a consensus. It can be
verified that with this restriction on information exchange, measurement fusion
alone results in an unbounded estimation error at every such agent that does
not have an observable set of measurements in its neighborhood. To over come
this challenge, state-estimate fusion has been proposed to recover the system
observability. However, we show that adding state-estimate fusion may not
recover observability when the system matrix is structured-rank (-rank)
deficient.
In this context, we characterize the state-estimate fusion and measurement
fusion under both full -rank and -rank deficient system matrices.Comment: submitted for IEEE journal publicatio
Minimum information loss fusion in distributed sensor networks
A key assumption of distributed data fusion is
that individual nodes have no knowledge of the global network
topology and use only information which is available locally.
This paper considers the weighted exponential product (WEP)
rule as a methodology for conservatively fusing estimates with
an unknown degree of correlation between them. We provide a
preliminary investigation into how the methodology for selecting
the mixing parameter can be used to minimize the information
loss in the fused covariance as opposed to reducing the Shannon
entropy, and hence maximize the information of the fused
covariance. Our results suggest that selecting a mixing parameter
which minimizes the information loss ensures that information
which is exclusive to the estimates from one source is not lost
during the fusion process. These results indicate that minimizing
the information loss provides a robust technique for selecting the
mixing parameter in WEP fusion
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