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Research on Improved Localization Algorithm Based on RSSI for Wireless Sensor Network in 3D

Author: CuiXiuFeng
Tutor: FengXiuFang
School: Taiyuan University of Technology
Course: Applied Computer Technology
Keywords: Wireless sensor networks Node localization IRSSI - 3D Trilateration
CLC: TN929.5
Type: Master's thesis
Year: 2011
Downloads: 280
Quote: 2
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Abstract


The emergence of wireless sensor networks (Wireless Sensor Network WSN) has aroused worldwide attention. As today's information hot areas of research involving multiple disciplines, a variety of techniques, including: network communication protocol, the core support technology, self-organization and management, development and application. Rich core support technology makes wireless sensor networks constitute a specific network systems for specific applications. As one of the core support technology in wireless sensor network node positioning technology is the basis of all applications, do not know the location information corresponding to the sensor data often does not make sense. WSN node localization algorithm, different classification results according to different classification criteria, based on the positioning algorithm by physical measurements to get the distance between nodes (or angle), the localization algorithm can be divided into two categories: distance positioning algorithm and is independent of the distance positioning algorithm. After the study shows, the former general can achieve better positioning accuracy Therefore, this paper focuses on the distance-based localization algorithms. The main work of this paper are summarized as follows: (1) a brief introduction of wireless sensor networks research status and developments, in-depth study of the knowledge and the basic principles of the existing wireless sensor network node positioning algorithm, introduced these algorithms, analysis, classification and comparison summary of their advantages and disadvantages. (2) analysis and comparison of commonly used Ranging method: infrared, ultrasonic, GPS and RSSI, focusing on the localization algorithm based on RSSI ranging, no additional hardware support, using only the strength of the wireless signal receiving end the distance between the sending and receiving nodes, RSSI-based location algorithm cheapest positioning method, RSSI-based location algorithm is more frequently used in the wireless sensor network localization process, however, the practical application due to multipath complex and non-line-of-sight propagation caused by the signal propagation model, will often lead to the RSSI ranging having great instability, resulting in a larger range of positioning error. To solve the above problem, this paper proposes the use of the principle of locality to cut ranging instability, that communication between the anchor node to its location attenuation coefficient. (3) At present, most of the localization algorithm is based on the algorithm of the two-dimensional plane. In practical applications, the node distribution is often in the terrain is more complex three-dimensional space environment, the algorithm application in a two-dimensional plane will be many problems. Therefore, the three-dimensional space node localization algorithm is necessary for a range of applications, this paper presents the RSSI ranging extended to the practical application of the three-dimensional environment. (4) In this paper, multiple nodes position estimation of objective and subjective reasons may manifest error, these estimates location filter, when the majority of the estimated location of more concentrated, while a small number of the estimated location is quite far away from the central location, we think that this The position of the few reliable estimated position, you can get rid of the other locations that are reliable, in order to improve the positioning accuracy. (5) Finally, experiments to verify the performance of the improved algorithm to locate. The MATLAB7.1 simulation tools RSSI-based location algorithm in two-dimensional space (RSSI-2D), RSSI-based location algorithm in three-dimensional space (RSSI-3D), improved RSSI-based location algorithm in three-dimensional space (irssi -3D) simulation. The simulation results show that the proposed improved RSSI-based three-dimensional positioning algorithm to improve the the node positioning accuracy, a wide range of applications.

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