Abstract
Particle filtering (PF) has been widely used in solving nonlinear/non Gaussian filtering problems. Inferring to the target tracking in a wireless sensor network (WSN), distributed PF (DPF) was used due to the limitation of nodes’ computing capacity. In this paper, a novel filtering method—asynchronous DPF (ADPF) for target tracking in WSN is proposed. There are two keys in the proposed algorithm. Firstly, instead of transferring value and weight of particles, Gaussian mixture model (GMM) is used to approximate the posteriori distribution, and only GMM parameters need to be transferred which can reduce the bandwidth and power consumption. Secondly, in order to use sampling information effectively, when target moving to the next cluster head region, the GMM parameters are transfer to the next cluster head, and combine with the new local GMM parameters to compose the new GMM parameters incrementally. The ADPF can also deal with the situation of different number of nodes in different cluster when using the dynamic cluster structure. The proposed ADPF is compared to some other DPF for WSN target tracking, and the experimental results show that not only the precision is improved, but also the bandwidth and power is reduced.
Highlights
IntroductionThe problem concerned is performing on-line state estimation for multi-dimensional signals that can be modeled using markovian state-space models that are nonlinear and non-Gaussian, Particle filter is one of the widely used tracking algorithms in non-linear/ Gaussian dynamic systems
One of the major goals of wireless sensor network (WSN) is to detect and track changes
In order to use sampling information effectively, when target moving to the cluster head region, the Gaussian mixture model (GMM) parameters are transfer to the cluster head, and combine with the new local GMM parameters to compose the new GMM parameters incrementally
Summary
The problem concerned is performing on-line state estimation for multi-dimensional signals that can be modeled using markovian state-space models that are nonlinear and non-Gaussian, Particle filter is one of the widely used tracking algorithms in non-linear/ Gaussian dynamic systems. When using such algorithm in sensor networks the energy cost related to computation in each sensor node and communication between sensor nodes is significant. A novel filtering method – asynchronous DPF (ADPF) for target tracking in WSN is proposed.
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