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We present a novel scheme for node localization in a Delay-Tolerant Sensor Network (DTN). In a DTN, sensor devices are often organized in network clusters that may be mutually disconnected. Some mobile robots may be used to collect data from the network clusters. The key idea in our scheme is to use this robot to perform location estimation for the sensor nodes it passes based on the signal strength of the radio messages received from them. Thus, we eliminate the processing constraints of static sensor nodes and the need for static reference beacons. Our mathematical contribution is the use of a Robust Extended Kalman Filter (REKF)-based state estimator to solve the localization. Compared to the standard extended Kalman filter, REKF is computationally efficient and also more robust. Finally, we have implemented our localization scheme on a hybrid sensor network test bed and show that it can achieve node localization accuracy within 1m in a large indoor setting.
Localization, delay-tolerant sensor networks, Robust Extended Kalman Filter, mobile robot, mobility.

N. Bulusu, P. N. Pathirana, A. V. Savkin and S. Jha, "Node Localization Using Mobile Robots in Delay-Tolerant Sensor Networks," in IEEE Transactions on Mobile Computing, vol. 4, no. , pp. 285-296, 2005.
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