Title :
An ultrasonic local positioning system using four base stations
Author :
Ohtani, Kozo ; Baba, Mitsuru ; Tanii, Yosuke
Author_Institution :
Hiroshima Inst. of Technol., Hiroshima, Japan
Abstract :
The purpose of tracking technology as it is currently used is to detect the position of a moving object. The leading position detection methods are classified as active type and passive type methods. Typical active type methods include radiofrequency identification (RFID) tags and ultrasonic waves, and passive type methods are global positioning systems (GPS) and cameras. RFID tags are being used indoors in many businesses. Though the ultrasonic wave method is advantageous because of the lower cost, there has been less research into this method than into the use of RFID tags. However, when the measurement environment changes such as the speed of sound, attenuation of the ultrasonic wave causes signal-to-noise (S/N) ratio decrease, pulse waveform is distorted by obstacles. Therefore, we propose a position detecting system using a time of arrival (ToA) method to improve the accuracy.
Keywords :
Global Positioning System; object detection; object tracking; radiofrequency identification; time-of-arrival estimation; ultrasonic waves; GPS; RFID; active type method; base stations; global positioning systems; moving object position detection; passive type method; pulse waveform; radiofrequency identification tags; time of arrival method; tracking technology; ultrasonic local positioning system; ultrasonic waves; Acoustics; Area measurement; Measurement uncertainty; Position measurement; Receivers; Transmitters; Ultrasonic variables measurement; Position detection; Time of arrival; Ultrasonic sensor;
Conference_Titel :
SICE Annual Conference (SICE), 2011 Proceedings of
Conference_Location :
Tokyo
Print_ISBN :
978-1-4577-0714-8