Real-Time Information Processing of Environmental Sensor Network Data

Osborne, Michael A and Roberts, Stephen J and Rogers, Alex and Jennings, Nicholas R (2012) Real-Time Information Processing of Environmental Sensor Network Data. ACM Transactions on Sensor Networks, 9 (1). (In Press)

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Abstract

In this paper, we consider the problem faced by a sensor network operator who must infer, in real-time, the value of some environmental parameter that is being monitored at discrete points in space and time by a sensor network. We describe a powerful and generic approach built upon an efficient multi-output Gaussian process that facilitates this information acquisition and processing. Our algorithm allows effective inference even with minimal domain knowledge, and we further introduce a formulation of Bayesian Monte Carlo to permit the principled management of the hyperparameters introduced by our flexible models. We demonstrate how our methods can be applied in cases where the data is delayed, intermittently missing, censored and/or correlated. We validate our approach using data collected from three networks of weather sensors and show that it yields better inference performance than both conventional independent Gaussian processes and the Kalman filter. Finally, we show that our formalism efficiently re-uses previous computations by following an online update procedure as new data sequentially arrives, and that this results in a four-fold increase in computational speed in the largest cases considered.

Item Type:	Article
Subjects:	Topics > Agent-based Computing Work Areas > Applications Work Areas > Incentive Engineering
Divisions:	University of Oxford University of Southampton
Depositing User:	Angela Westley
Date Deposited:	14 Nov 2011 09:54
Last Modified:	22 Mar 2012 09:40
URI:	http://www.orchid.ac.uk/eprints/id/eprint/11

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