A Novel Broadband Ultrasonic Location System
UbiComp '02 Proceedings of the 4th international conference on Ubiquitous Computing
An Introduction to the Kalman Filter
An Introduction to the Kalman Filter
RF Free Ultrasonic Positioning
ISWC '03 Proceedings of the 7th IEEE International Symposium on Wearable Computers
Tracking moving devices with the cricket location system
Proceedings of the 2nd international conference on Mobile systems, applications, and services
Accuracy characterization for metropolitan-scale Wi-Fi localization
Proceedings of the 3rd international conference on Mobile systems, applications, and services
Place lab: device positioning using radio beacons in the wild
PERVASIVE'05 Proceedings of the Third international conference on Pervasive Computing
An Ultrasonic 3D Positioning System Using a Single Compact Receiver Unit
LoCA '09 Proceedings of the 4th International Symposium on Location and Context Awareness
Localizing tags using mobile infrastructure
LoCA'07 Proceedings of the 3rd international conference on Location-and context-awareness
Ultrasound-based movement sensing, gesture-, and context-recognition
Proceedings of the 2013 International Symposium on Wearable Computers
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In this paper we present a user-centric position sensing system that is based on asynchronous, independent ultrasonic beacons. These stationary transmitter units are small, cheap to manufacture, and have power requirements low enough to run each from a small solar cell and a nearby light source. Each beacon is programmed to emit a short, 40 kHz ultrasonic signal with a unique transmission period. The mobile receiver unit first associates a received signal with a beacon based on the observed periodicity, then measures the Doppler shift in the periodicity that results from movements of the receiver. Using Doppler shifts from a number of different beacons, the receiver is able to estimate both its position and velocity by employing a particle filter. In this paper, we describe our positioning algorithm, the hardware, and proof-of-concept results.