Improvement and Performance Analysis of 3-D Localization TDOA System
Date Issued
2011
Date
2011
Author(s)
Chang, Yen-Wen
Abstract
This work established a 3-D ultrasonic position measurement system which is composed of five ultrasonic transducers. The signal processing method is based on acoustic time-difference-of-arrival (TDOA) and improved according to our positioning system. A new algorithm of four differences of arrival time to locate the unknown acoustic source was used. Compare to the original algorithm, our method is simpler and of higher reliability. Our method of time signal processing is different from the traditional one which fetch the time signal correspond to maximum signal amplitude. We presented a new method with higher accuracy of fetching the average time correspond to 50%~90% amplitude of signal. The experimental positioning system was established with different receiver array size and different time acquisition method. The experiment results, confirm that our system using new algorithm and new time acquisition method is well operated. Finally we analyzed the system performance by examining the error percentages and standard deviation of arbitrary source locations. The highly reliable spatial region in which the location performance is well was then identified.
Subjects
indoor localization
ultrasonic
time difference of arrival
Type
thesis
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