The active badge location system
ACM Transactions on Information Systems (TOIS)
Proceedings of the 25th annual conference on Computer graphics and interactive techniques
The Cricket location-support system
MobiCom '00 Proceedings of the 6th annual international conference on Mobile computing and networking
Timing-sync protocol for sensor networks
Proceedings of the 1st international conference on Embedded networked sensor systems
Adaptive clock synchronization in sensor networks
Proceedings of the 3rd international symposium on Information processing in sensor networks
The flooding time synchronization protocol
SenSys '04 Proceedings of the 2nd international conference on Embedded networked sensor systems
Fine-grained network time synchronization using reference broadcasts
OSDI '02 Proceedings of the 5th symposium on Operating systems design and implementationCopyright restrictions prevent ACM from being able to make the PDFs for this conference available for downloading
WiPS: Location and Motion Sensing Technique of IEEE 802.11 Devices
ICITA '05 Proceedings of the Third International Conference on Information Technology and Applications (ICITA'05) Volume 2 - Volume 02
The Emerging Ethics of Humancentric GPS Tracking and Monitoring
ICMB '06 Proceedings of the International Conference on Mobile Business
The Lighthouse Location System for Smart Dust
Proceedings of the 1st international conference on Mobile systems, applications and services
Hidden Issues in Deploying an Indoor Location System
IEEE Pervasive Computing
Robust estimator for non-line-of-sight error mitigation in indoor localization
EURASIP Journal on Applied Signal Processing
Redundant positioning architecture
Computer Communications
Guiding support for ‘way-finding' in unknown buildings: design and evaluation
ICCHP'06 Proceedings of the 10th international conference on Computers Helping People with Special Needs
Ethically aware design of a location system for people with dementia
ICCHP'06 Proceedings of the 10th international conference on Computers Helping People with Special Needs
Temporal orientation panel for special education
ICCHP'06 Proceedings of the 10th international conference on Computers Helping People with Special Needs
AmbienNet: an intelligent environment to support people with disabilities and elderly people
Proceedings of the 10th international ACM SIGACCESS conference on Computers and accessibility
Indoor Localization Based on Neural Networks for Non-dedicated ZigBee Networks in AAL
IWANN '09 Proceedings of the 10th International Work-Conference on Artificial Neural Networks: Part I: Bio-Inspired Systems: Computational and Ambient Intelligence
Towards an intelligent and supportive environment for people with physical or cognitive restrictions
Proceedings of the 2nd International Conference on PErvasive Technologies Related to Assistive Environments
Managing Intelligent Services for People with Disabilities and Elderly People
UAHCI '09 Proceedings of the 5th International on ConferenceUniversal Access in Human-Computer Interaction. Part II: Intelligent and Ubiquitous Interaction Environments
An architecture for assisted navigation in intelligent environments
International Journal of Communication Networks and Distributed Systems
Using mobiles for on campus location tracking
Proceedings of the 7th International Conference on Advances in Mobile Computing and Multimedia
Wireless sensor networks for healthcare: A survey
Computer Networks: The International Journal of Computer and Telecommunications Networking
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Many techniques have been developed to perform indoor location. Each strategy has its own advantages and drawbacks, with the application demanding location information the main determinant of the system to be used. In this paper, a system is presented that serves location to innovative services for elderly and disabled people, ranging from alarm and monitoring to support for navigation and leisure. The system uses ZigBee and ultrasound to fulfill the application requirements, differing in this respect from all other existing systems. ZUPS (ZigBee and ultrasound positioning system) provides wide multicell coverage, easy extension, robustness even in crowded scenarios, different levels of precision depending on the user's profile and service requirements (from a few centimeters to meters), limited infrastructure requirements, simple calibration, and cost-effectiveness. The system has been evaluated from the technical, functional, and usability standpoints, with satisfactory results, and its suitability has also been demonstrated in a residence for people with disabilities located in Zaragoza, Spain.