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Research and Realization of the RSSI-based Positioning Technology for WSN

Author: LiuGuangZuo
Tutor: YuHongYi
School: PLA Information Engineering University
Course: Communication and Information System
Keywords: Wireless sensor networks Received signal strength Locate Coal mine tunnel
CLC: TN929.5
Type: Master's thesis
Year: 2009
Downloads: 250
Quote: 2
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Abstract


Wireless sensor network is considered to be one of the most important technologies of the 21st century, has a broad application in the military, the environment, industry and other fields. Positioning technologies directly associated with a lot of practical applications of particular attention. Aiming WSN low cost, high flexibility characteristics, the use of the received signal strength indication (RSSI, Received Signal Strength Indicator) positioning technology has been studied, and in the existing software and hardware platform for mine roadway a positioning system. This paper studies the positioning signal attenuation model-based method. Based on RSSI location technology study is divided into two areas, signal attenuation-based positioning method is one of them. Fully studied the research status on the basis of the paper by a large number of field measurement experiment, the RSSI probability characteristics, and then given a weighted least squares method to determine the weights. Unknown parameters for signal attenuation model or estimate inaccurate, and put forward a method to calculate the location of two RSSI difference. Occlusion is a major problem affecting the RSSI positioning accuracy, this paper carried out a series of experiments, the human randomized block the signal propagation path through the statistical analysis of data, and ultimately given a weighted probability model maximum likelihood estimation method The experiment confirmed that the method in the shielding case, representing ML estimation can significantly improve positioning accuracy. Secondly, RSSI-based location technology is a major aspect of - empirical model positioning method commenced. The existing empirical model positioning methods (including neural networks), there can not be a good problem to adapt to changes in the application environment. For this deficiency, this paper presents a dynamic database-based method and location of the beacon positioning, and conservative criteria and open standards to control the dynamic adjustment process of the database, by selecting different criteria can achieve better positioning. The use of multiple positioning the correlation characteristic of the space between the results, the introduction of the Bayesian filter, so that the positioning accuracy further increase. Cramer - Rao lower bound (CRLB) as a branch of the algorithm research paper using a separate chapter on the position estimation is derived, and in accordance with the The CRLB nature gives a measure of the reference node laying positioning error factor - - regional average positioning variance lower bound. Established a mathematical model for solving the reference node topological forms by this measure factor, obtained by solving the lower bound of the minimum significance under the reference node laying the regional average positioning variance. Its conclusions node layout and other issues has theoretical significance. In implementation section combined for RSSI location technology to complete the the positioning subsystem design and implementation work in the coal mine position monitoring and management system. The NesC language were used in the embedded operating system TinyOS and windows operating system and the Microsoft Visual C compiler environment complete access to information in the positioning subsystem, cable transmission and positioning of each module. The long-term test results show that the system is stable, able to provide users with high positioning accuracy.

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CLC: > Industrial Technology > Radio electronics, telecommunications technology > Wireless communications > Mobile Communications
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