Optimized data rate allocation for dynamic sensor fusion over resource constrained communication networks |
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Authors: | Hyunho
Jung Ali Reza Pedram Travis C Cuvelier Takashi Tanaka |
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Affiliation: | 1. Walker Department of Mechanical Engineering, University of Texas at Austin, Austin, Texas, USA;2. Department of Electrical and Computer Engineering, University of Texas at Austin, Austin, Texas, USA;3. Department of Aerospace Engineering and Engineering Mechanics, University of Texas at Austin, Austin, Texas, USA |
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Abstract: | This article presents a new method to solve a dynamic sensor fusion problem. We consider a large number of remote sensors which measure a common Gauss–Markov process. Each sensor encodes and transmits its measurement to a data fusion center through a resource restricted communication network. The communication cost incurred by a given sensor is quantified as the expected bitrate from the sensor to the fusion center. We propose an approach that attempts to minimize a weighted sum of these communication costs subject to a constraint on the state estimation error at the fusion center. We formulate the problem as a difference-of-convex program and apply the convex-concave procedure (CCP) to obtain a heuristic solution. We consider a 1D heat transfer model and a model for 2D target tracking by a drone swarm for numerical studies. Through these simulations, we observe that our proposed approach has a tendency to assign zero data rate to unnecessary sensors indicating that our approach is sparsity-promoting, and an effective sensor selection heuristic. |
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Keywords: | control over communications information theory and control sensor fusion sparsity-promoting wireless sensor network |
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