Distributed Least-Squares Estimation of a Remote Chemical Source via Convex Combination in Wireless Sensor Networks

Sensors

Ming Zeng¹  Wei Li¹  Qing-Hao Meng¹  Meng-Li Cao¹  Biao Sun¹  Cheng-Jun Ding² 

[1] Institute of Robotics and Autonomous Systems, Tianjin Key Laboratory of Process Measurement and Control, School of Electrical Engineering and Automation, Tianjin University, No. 92,Weijin Road, Tianjin 300072, China;School of Mechanical Engineering, Hebei University of Technology, Dingzigu Road No.1,Tianjin 300130, China;

关键词: chemical source localization;    wireless sensor networks;    distributed estimation;    nonlinear least-squares estimation;    collaborative in-network processing;   

DOI  :  10.3390/s140711444

来源: DOAJ

【 摘 要 】

This paper investigates the problem of locating a continuous chemical source using the concentration measurements provided by a wireless sensor network (WSN). Such a problem exists in various applications: eliminating explosives or drugs, detecting the leakage of noxious chemicals, etc. The limited power and bandwidth of WSNs have motivated collaborative in-network processing which is the focus of this paper. We propose a novel distributed least-squares estimation (DLSE) method to solve the chemical source localization (CSL) problem using a WSN. The DLSE method is realized by iteratively conducting convex combination of the locally estimated chemical source locations in a distributed manner. Performance assessments of our method are conducted using both simulations and real experiments. In the experiments, we propose a fitting method to identify both the release rate and the eddy diffusivity. The results show that the proposed DLSE method can overcome the negative interference of local minima and saddle points of the objective function, which would hinder the convergence of local search methods, especially in the case of locating a remote chemical source.

【 授权许可】

Unknown