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A high-accuracy, low-cost localization system for wireless sensor networks
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Proceedings of the 5th international conference on Mobile systems, applications and services
Tracking mobile nodes using RF Doppler shifts
Proceedings of the 5th international conference on Embedded networked sensor systems
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Proceedings of the 6th ACM conference on Embedded network sensor systems
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InTrack: high precision tracking of mobile sensor nodes
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LoCA'07 Proceedings of the 3rd international conference on Location-and context-awareness
Bilateration: an attack-resistant localization algorithm of wireless sensor network
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MSN'07 Proceedings of the 3rd international conference on Mobile ad-hoc and sensor networks
Distributed inference for network localization using radio interferometric ranging
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RF doppler shift-based mobile sensor tracking and navigation
ACM Transactions on Sensor Networks (TOSN)
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Using RF received phase for indoor tracking
Proceedings of the 6th Workshop on Hot Topics in Embedded Networked Sensors
Stochastic radio interferometric positioning in the 2.4 GHz range
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Proceedings of the 15th Workshop on Mobile Computing Systems and Applications
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This paper presents an enhanced version of a novel radio interferometric positioning technique for node localization in wireless sensor networks that provides both high accuracy and long range simultaneously. The ranging method utilizes two transmitters emitting radio signals at almost the same frequencies. The relative location is estimated by measuring the relative phase offset of the generated interference signal at two receivers. Here, we analyze how the selection of carrier frequencies affects the precision and maximum range. Furthermore, we describe how the interplay of RF multipath and ground reflections degrades the ranging accuracy. To address these problems, we introduce a technique that continuously refines the range estimates as it converges to the localization solution. Finally, we present the results of a field experiment where our prototype achieved 4~cm average localization accuracy for a quasi-random deployment of 16 COTS motes covering the area of two football fields. The maximum range measured was 170~m, four times the observed communication range. Consequently, node deployment density is no longer constrained by the localization technique, but rather by the communication range.