The active badge location system
ACM Transactions on Information Systems (TOIS)
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The HiBall Tracker: high-performance wide-area tracking for virtual and augmented environments
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The Cricket location-support system
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GHT: a geographic hash table for data-centric storage
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Data-centric storage in sensornets
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Wireless LAN location-sensing for security applications
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Data-centric storage in sensornets with GHT, a geographic hash table
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Seamless User-Level Handoff in Ubiquitous Multimedia Service Delivery
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Distributed regression: an efficient framework for modeling sensor network data
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Low-dimensional embedding with extra information
SCG '04 Proceedings of the twentieth annual symposium on Computational geometry
From devices to tasks: automatic task prediction for personalized appliance control
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Localization in sensor networks
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VOR base stations for indoor 802.11 positioning
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ELF: an efficient log-structured flash file system for micro sensor nodes
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IPDPS '05 Proceedings of the 19th IEEE International Parallel and Distributed Processing Symposium (IPDPS'05) - Workshop 12 - Volume 13
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Proceedings of the 2005 ACM SIGPLAN conference on Programming language design and implementation
A programming language for ad-hoc networks of mobile devices
LCR '04 Proceedings of the 7th workshop on Workshop on languages, compilers, and run-time support for scalable systems
A relative positioning system for co-located mobile devices
Proceedings of the 3rd international conference on Mobile systems, applications, and services
A wireless LAN-based indoor positioning technology
IBM Journal of Research and Development
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IEEE Pervasive Computing
Sensing and visualizing spatial relations of mobile devices
Proceedings of the 18th annual ACM symposium on User interface software and technology
Error analysis of localization systems for sensor networks
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Broadband Ultrasonic Location Systems for Improved Indoor Positioning
IEEE Transactions on Mobile Computing
Semidefinite programming based algorithms for sensor network localization
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Robotics-based location sensing using wireless Ethernet
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COMPASS: A probabilistic indoor positioning system based on 802.11 and digital compasses
WiNTECH '06 Proceedings of the 1st international workshop on Wireless network testbeds, experimental evaluation & characterization
Multi-sensory and Multi-modal Fusion for Sentient Computing
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Calibration-free WLAN location system based on dynamic mapping of signal strength
Proceedings of the 4th ACM international workshop on Mobility management and wireless access
The design and implementation of a self-calibrating distributed acoustic sensing platform
Proceedings of the 4th international conference on Embedded networked sensor systems
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Service-Oriented Network Sockets
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Ubiquitous Home Security Robot Based on Sensor Network
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Applying algebraic approaches for modeling workflows and their transformations in mobile networks
Mobile Information Systems
Robust system multiangulation using subspace methods
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Robust node localization for wireless sensor networks
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Localization for anchoritic sensor networks
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OTMCL: orientation tracking-based Monte Carlo localization for mobile sensor networks
INSS'09 Proceedings of the 6th international conference on Networked sensing systems
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Indoor Positioning Using FM Radio
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ALO: An ultrasound system for localization and orientation based on angles
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Hi-index | 0.01 |
The ability to determine the orientation of a device is of fundamental importance in context aware and location-dependent mobile computing. By analogy to a traditional compass, knowledge of orientation through the Cricket compass attached to a mobile device enhances various applications, including efficient way-finding and navigation, directional service discovery, and “augmented-reality” displays. Our compass infrastructure enhances the spatial inference capability of the Cric ketindoor location system [20], and enables new pervasive computing applications.Using fixed active beacons and carefully placed passive ultrasonic sensors, we show how to estimate the orientation of a mobile device to within a few degrees, using precise, sub-centimeter differences in distance estimates from a beacon to each sensor on the compass. Then, given a set of fixed, active position beacons whose locations are known, we describe an algorithm that combines several carrier arrival times to produce a robust estimate of the rigid orientation of the mobile compass.The hardware of the Cricket compass is small enough to be integrated with a handheld mobile device. It includes five passive ultrasonic receivers, each 0.8cm in diameter, arrayed in a “V” shape a few centimeters across. Cricket beacons deployed throughout a building broadcast coupled 418MHz RF packet data and a 40KHz ultrasound carrier, which are processed by the compass software to obtain differential distance and position estimates. Our experimental results show that our prototype implementation can determine compass orientation to within 3 degrees when the true angle lies between ±30 degrees, and to within 5 degrees when the true angle lies between ±40 degrees, with respect to a fixed beacon.