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Due to increasing applications using location information, localization has been one of important research issues in Wireless Sensor Networks (WSN). A straight-forward approach is to add the GPS receivers to all nodes. Because of the strict H/W restrictions of WSN applications, localization schemes, which do not need expensive H/W devices, may be feasible in WSN. The authors propose a localization method using mobile anchor trajectory. When the mobile anchor broadcasts its locations periodically, sensor nodes pair them with RSSIs and estimate the trajectory of the mobile anchor. If sensor nodes have two different trajectories, their locations can be calculated. In their method, sensor nodes do not need additional H/W devices. The experimental results show better performance compared with other mobile anchor based methods.
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