Title :
Localization of Diffusive Sources Using Distributed Sequential Bayesian Methods in Wireless Sensor Networks
Author :
Zhao, Tong ; Nehorai, Arye
Author_Institution :
Dept. of Electr. & Comput. Eng., Illinois Univ., Chicago, IL
Abstract :
We develop an efficient distributed sequential Bayesian estimation method to localize a diffusive source in wireless sensor networks. Potential applications include security, environmental monitoring, pollution control, and explosives detection. We first derive the physical model of the substance dispersion by solving the diffusion equations under different environmental scenarios. We then integrate the derived dispersion models into the distributed processing technologies, and propose a distributed sequential Bayesian localization technique, in which the state belief is transmitted in the wireless sensor networks and updated using the measurements from the new sensor node. In order to decrease the required communication burden we propose two parameterizable belief approximations: a Gaussian approximation and a new linear combination of polynomial Gaussian approximation. We also apply the idea of information-driven sensor scheduling and select the next sensor node according to certain criterions to reduce the response time and save energy consumption of the sensor network
Keywords :
Bayes methods; Gaussian processes; polynomial approximation; scheduling; sequential estimation; wireless sensor networks; diffusive sources; distributed sequential Bayesian methods; information-driven sensor scheduling; localization technique; parameterizable belief approximations; polynomial Gaussian approximation; substance dispersion; wireless sensor networks; Bayesian methods; Differential equations; Dispersion; Distributed processing; Explosives; Gaussian approximation; Monitoring; Pollution control; Pollution measurement; Wireless sensor networks;
Conference_Titel :
Acoustics, Speech and Signal Processing, 2006. ICASSP 2006 Proceedings. 2006 IEEE International Conference on
Conference_Location :
Toulouse
Print_ISBN :
1-4244-0469-X
DOI :
10.1109/ICASSP.2006.1661136