TY - GEN
T1 - Asynchronous ultrasonic trilateration for indoor positioning of mobile phones
AU - Filonenko, Viacheslav
AU - Cullen, Charlie
AU - Carswell, James D.
PY - 2012
Y1 - 2012
N2 - In this paper we discuss how the innate ability of mobile phone speakers to produce ultrasound can be used for accurate indoor positioning. The frequencies in question are in a range between 20 and 22 KHz, which is high enough to be inaudible by humans but still low enough to be generated by today's mobile phone sound hardware. Our tests indicate that it is possible to generate the given range of frequencies without significant distortions, provided the signal volume is not turned excessively high. In this paper we present and evaluate the accuracy of our asynchronous trilateration method (Lok8) for mobile positioning without requiring knowledge of the time the ultrasonic signal was sent. This approach shows that only the differences in time of arrival to multiple microphones (control points) placed throughout the indoor environment is sufficient. Consequently, any timing issues with client and server synchronization are avoided.
AB - In this paper we discuss how the innate ability of mobile phone speakers to produce ultrasound can be used for accurate indoor positioning. The frequencies in question are in a range between 20 and 22 KHz, which is high enough to be inaudible by humans but still low enough to be generated by today's mobile phone sound hardware. Our tests indicate that it is possible to generate the given range of frequencies without significant distortions, provided the signal volume is not turned excessively high. In this paper we present and evaluate the accuracy of our asynchronous trilateration method (Lok8) for mobile positioning without requiring knowledge of the time the ultrasonic signal was sent. This approach shows that only the differences in time of arrival to multiple microphones (control points) placed throughout the indoor environment is sufficient. Consequently, any timing issues with client and server synchronization are avoided.
KW - Indoor Mobile Positioning
KW - LBS
KW - Ultrasonic Trilateration
UR - https://www.scopus.com/pages/publications/84859718911
U2 - 10.1007/978-3-642-29247-7_4
DO - 10.1007/978-3-642-29247-7_4
M3 - Conference contribution
AN - SCOPUS:84859718911
SN - 9783642292460
T3 - Lecture Notes in Computer Science (including subseries Lecture Notes in Artificial Intelligence and Lecture Notes in Bioinformatics)
SP - 33
EP - 46
BT - Web and Wireless Geographical Information Systems - 11th International Symposium, W2GIS 2012, Proceedings
T2 - 11th International Symposium on Web and Wireless Geographical Information Systems, W2GIS 2012
Y2 - 12 April 2012 through 13 April 2012
ER -