The anatomy of a context-aware application
MobiCom '99 Proceedings of the 5th annual ACM/IEEE international conference on Mobile computing and networking
The Cricket location-support system
MobiCom '00 Proceedings of the 6th annual international conference on Mobile computing and networking
The cricket compass for context-aware mobile applications
Proceedings of the 7th annual international conference on Mobile computing and networking
A Novel Broadband Ultrasonic Location System
UbiComp '02 Proceedings of the 4th international conference on Ubiquitous Computing
A High Performance Privacy-Oriented Location System
PERCOM '03 Proceedings of the First IEEE International Conference on Pervasive Computing and Communications
On the Usability of Secure Association of Wireless Devices Based on Distance Bounding
CANS '09 Proceedings of the 8th International Conference on Cryptology and Network Security
A novel acoustic indoor localization system employing CDMA
Digital Signal Processing
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We present an improvement to ultrasound-based indoor location systems like Cricket (Priyantha et al. The Cricket location-support system, 2000). By encoding and modulating the ultrasound pulses, we are able to achieve greater accuracy in distance measurements. Besides improving the distance measurements, we improve the position update rate by synchronising the active beacons. We also propose a method that could further improve the update rate by superimposing encoded ultrasound pulses. Further, an experimental evaluation of our improvements is presented.