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Sensors 2011, 11(10), 9989-10009; doi:10.3390/s111009989

Collaborative Localization Algorithms for Wireless Sensor Networks with Reduced Localization Error

1,*  and 2,3
Received: 23 August 2011 / Revised: 12 October 2011 / Accepted: 18 October 2011 / Published: 21 October 2011
(This article belongs to the Special Issue Collaborative Sensors)
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Localization is an important research issue in Wireless Sensor Networks (WSNs). Though Global Positioning System (GPS) can be used to locate the position of the sensors, unfortunately it is limited to outdoor applications and is costly and power consuming. In order to find location of sensor nodes without help of GPS, collaboration among nodes is highly essential so that localization can be accomplished efficiently. In this paper, novel localization algorithms are proposed to find out possible location information of the normal nodes in a collaborative manner for an outdoor environment with help of few beacons and anchor nodes. In our localization scheme, at most three beacon nodes should be collaborated to find out the accurate location information of any normal node. Besides, analytical methods are designed to calculate and reduce the localization error using probability distribution function. Performance evaluation of our algorithm shows that there is a trade off betweendeployed number of beacon nodes and localization error, and average localization time of the network can be increased with increase in the number of normal nodes deployed over a region.
Keywords: wireless sensor networks; localization; error estimation wireless sensor networks; localization; error estimation
This is an open access article distributed under the Creative Commons Attribution License which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited.

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Sahoo, P.K.; Hwang, I.-S. Collaborative Localization Algorithms for Wireless Sensor Networks with Reduced Localization Error. Sensors 2011, 11, 9989-10009.

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