The design and implementation of a self-calibrating distributed acoustic sensing platform
Proceedings of the 4th international conference on Embedded networked sensor systems
BeepBeep: a high accuracy acoustic ranging system using COTS mobile devices
Proceedings of the 5th international conference on Embedded networked sensor systems
Identifying and facilitating social interaction with a wearable wireless sensor network
Personal and Ubiquitous Computing
Collaborative PDR Localisation with Mobile Phones
ISWC '11 Proceedings of the 2011 15th Annual International Symposium on Wearable Computers
Near ultrasonic directional data transfer for modern smartphones
Proceedings of the 13th international conference on Ubiquitous computing
On the feasibility of real-time phone-to-phone 3D localization
Proceedings of the 9th ACM Conference on Embedded Networked Sensor Systems
Audio location: accurate low-cost location sensing
PERVASIVE'05 Proceedings of the Third international conference on Pervasive Computing
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We present a method for proximity detection with mobile phones that is based on a combination of Bluetooth communication (for the detection of coarse proximity) and sound beacons in an inaudible spectrum around 18kHz for a finer spatial resolution. The system performs a real-time recognition of personal encounters in two common situations: standing together and walking by each other. We evaluate our approach in a variety of settings ranging from office corridor, through a busy street to a shopping mall.