Relative-Localization Identification of Random Distributed Wireless Sensor Network Nodes
Date Issued
2010
Date
2010
Author(s)
Wei, Ying-Feng
Abstract
In the past few years, localization technology has gained more and more attentions. Wireless sensor network is one of best solutions since nodes can be easily distributed around monitored environment and relay the required sensors information. Most methods require a pre-built infrastructure with anchor nodes, whose positions are known, to locate the blind nodes (unanchored nodes). These kinds of methods would take user much time to construct the system. For example, if user wants to move the locating system from one place to another, user should re-build all the anchor nodes due to the different environment. The most ideal method is to let user randomly distribute all the nodes and they will be located automatically.
In this thesis, a relative-localization identification of random deployed non-anchored nodes will be presented. Based on relative RSSI information, the system can identify which sensor nodes are placed in locations that are planned on the map. The method can let user put any nodes anywhere (random distributed), and the nodes will locate themselves without knowing the coordinate (absolute or relative) beforehand.
The main idea of this paper is: “Further nodes would get weaker signal strength, and vice versa.” Because the relationship between RSSI value and distance is not always fixed, the RSSI can not be transformed to distance directly. Nevertheless, we still can use the RSSI value to know which node is closer and which is further by the idea mentioned above. The distance relationship can draw the map which includes the relative locations of all the nodes. The algorithm and experimental verification of this method will all be detailed in this paper.
Subjects
Wireless Sensor Network (WSN)
Non-Anchor Node
Self-Localization
Random distributed
Received Signal Strength Indicator(RSSI)
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