The Cricket location-support system
MobiCom '00 Proceedings of the 6th annual international conference on Mobile computing and networking
Dynamic fine-grained localization in Ad-Hoc networks of sensors
Proceedings of the 7th annual international conference on Mobile computing and networking
Localization from mere connectivity
Proceedings of the 4th ACM international symposium on Mobile ad hoc networking & computing
Localization for mobile sensor networks
Proceedings of the 10th annual international conference on Mobile computing and networking
EURASIP Journal on Wireless Communications and Networking
Connectivity and RSSI based localization scheme for wireless sensor networks
ICIC'05 Proceedings of the 2005 international conference on Advances in Intelligent Computing - Volume Part II
Relative location estimation in wireless sensor networks
IEEE Transactions on Signal Processing
RSSI-based relative localisation for mobile robots
Ad Hoc Networks
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It is common that a small group of autonomous mobile units requires location information of each other, but it is often not applicable to build infrastructure for location service. Hence, mobile units use RF signals to determine their relative positions within the group. Several techniques have been proposed for localization, but none of them consider both units mobility and anchor unavailability. In this paper we develop a propagation scheme for spreading the signal strength information through the network, and filtering techniques are employed to process the noisy signal. We use Floyd-Warshall algorithm to generate pairwise signal distance of each pair of units. Then Multidimensional Scaling technique is used to generate relative position from pairwise distances. Due to anchor unavailability, relative positions are adjusted by certain rules to reflect the continuous mobility. We verify our methods in MICAz platform. Experimental results show that we can obtain smooth relative positions under mobility and manage moving patterns of mobile units.