DocumentCode :
3705365
Title :
A rapid and accurate time-synchronization technique for acoustic localization using modulated illumination
Author :
Hayato Kumaki;Masanori Sugimoto;Hiromichi Hashizume;Takayuki Akiyama;Taishi Saito
Author_Institution :
Hokkaido University, Sapporo, Japan
fYear :
2015
Firstpage :
1
Lastpage :
10
Abstract :
This paper presents a rapid and accurate time-synchronization technique for acoustic localization. Two LED arrays for modulated illumination and an off-the-shelf camera are used. An equation that specifies the time difference between them accurately and precisely is proposed. Experiments in real environments show that the proposed technique using rectangular signals can achieve time synchronization to within 29.4 μs (5.94 μs standard deviation) and acoustic ranging to within 9.9 mm (2.01 mm standard deviation) for a measurement period of 0.1 s. Because of the smaller standard deviation in comparison with the error, it is indicated that there exist systematic errors to be removable. This technique will enable the implementation of an acoustic 3D localization system for mobile devices such as tablet PCs and smartphones based on time-of-arrival trilateration, which is more accurate than positioning taking a time-difference-of-arrival approach. Theoretical analyses for modulated illumination considering a camera exposure time clarify how an optimally modulated signal is designed for achieving rapid and accurate time synchronization.
Keywords :
"Synchronization","Cameras","Acoustics","Lighting","Light emitting diodes","Smart phones","Clocks"
Publisher :
ieee
Conference_Titel :
Indoor Positioning and Indoor Navigation (IPIN), 2015 International Conference on
Type :
conf
DOI :
10.1109/IPIN.2015.7346963
Filename :
7346963
Link To Document :
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