The active badge location system
ACM Transactions on Information Systems (TOIS)
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
People, places, things: Web presence for the real world
WMCSA '00 Proceedings of the Third IEEE Workshop on Mobile Computing Systems and Applications (WMCSA'00)
Challenge: ubiquitous location-aware computing and the "place lab" initiative
Proceedings of the 1st ACM international workshop on Wireless mobile applications and services on WLAN hotspots
Tracking moving devices with the cricket location system
Proceedings of the 2nd international conference on Mobile systems, applications, and services
Ubiquitous Computing Using Wireless Broadcast
WMCSA '04 Proceedings of the Sixth IEEE Workshop on Mobile Computing Systems and Applications
Audio Networking: The Forgotten Wireless Technology
IEEE Pervasive Computing
MobiUS: enable together-viewing video experience across two mobile devices
Proceedings of the 5th international conference on Mobile systems, applications and services
E-Textiles for Autonomous Location Awareness
IEEE Transactions on Mobile Computing
BeepBeep: a high accuracy acoustic ranging system using COTS mobile devices
Proceedings of the 5th international conference on Embedded networked sensor systems
Attack-tolerant localization via iterative verification of locations in sensor networks
ACM Transactions on Embedded Computing Systems (TECS)
Sonar-based measurement of user presence and attention
Proceedings of the 11th international conference on Ubiquitous computing
Indoor localization without infrastructure using the acoustic background spectrum
MobiSys '11 Proceedings of the 9th international conference on Mobile systems, applications, and services
Detecting driver phone use leveraging car speakers
MobiCom '11 Proceedings of the 17th annual international conference on Mobile computing and networking
International Journal of Communication Networks and Distributed Systems
TWEET: an envelope detection based broadband ultrasonic ranging system
Proceedings of the 14th ACM international conference on Modeling, analysis and simulation of wireless and mobile systems
Harvesting of location-specific information through wifi networks
LoCA'06 Proceedings of the Second international conference on Location- and Context-Awareness
BeepBeep: A high-accuracy acoustic-based system for ranging and localization using COTS devices
ACM Transactions on Embedded Computing Systems (TECS)
Virtual compass: relative positioning to sense mobile social interactions
Pervasive'10 Proceedings of the 8th international conference on Pervasive Computing
Asynchronous ultrasonic trilateration for indoor positioning of mobile phones
W2GIS'12 Proceedings of the 11th international conference on Web and Wireless Geographical Information Systems
Centaur: locating devices in an office environment
Proceedings of the 18th annual international conference on Mobile computing and networking
Push the limit of WiFi based localization for smartphones
Proceedings of the 18th annual international conference on Mobile computing and networking
Indoor pseudo-ranging of mobile devices using ultrasonic chirps
Proceedings of the 10th ACM Conference on Embedded Network Sensor Systems
RoomSense: an indoor positioning system for smartphones using active sound probing
Proceedings of the 4th Augmented Human International Conference
Guoguo: enabling fine-grained indoor localization via smartphone
Proceeding of the 11th annual international conference on Mobile systems, applications, and services
Acoustical ranging techniques in embedded wireless sensor networked devices
ACM Transactions on Sensor Networks (TOSN)
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In this paper, we propose a system that uses the wireless networking and microphone interfaces of mobile devices to determine location to room-level accuracy. The wireless network provides a synchronizing pulse along with information about the room. This is accompanied by an ultrasound beacon that allows us to resolve locations to the confines of a physical room (since audio is mostly bounded by walls). We generate the wireless data and ultrasound pulses from the existing PCs in each room; a PDA carried by a user listens for both signals. Thus, our approach does not require special hardware. We do not use ultrasound to send data. As a result we dramatically reduce the computational burden on the mobile device while also decreasing the latency of location resolution. Our results indicate that (i) ultrasound detection is robust even in noisy environments with many reflective surfaces; and (ii) that we can determine the correct room within a couple of seconds with high probability even when the ultrasound emitting PCs are not synchronized.