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Indoor Location System based on TDOA between RF and Ultrasonic Signal  

Seo, Young-Dong ((주)피앤이솔루션 기술연구소)
Song, Moon-Kyou (원광대학교 전자및제어공학부)
Publication Information
The Journal of Korean Institute of Communications and Information Sciences / v.34, no.6C, 2009 , pp. 611-618 More about this Journal
Abstract
Recently, an indoor location-aware technology has been focused on as a key technology for context awareness in ubiquitous computing environments. The conventional Cricket system was designed with a non-centralized architecture, which has advantages in terms of user privacy, deployment, scalability, decentralized administration, network heterogeneity, and low cost. In this paper, an indoor location system based on TDOA between RF and ultrasound signals is designed, which improves the Cricket system. A 2.4GHz frequency is employed for transmitting RF messages, which is in an ISM band. The beaconing frequency is doubled to enhance the channel utilization rate. The ultrasonic pulse duration is optimized to increase the coverage of ultrasonic signals. The function of calculating location coordinates is embedded in a listener. The location-update rate and location accuracy are also improved.
Keywords
TDOA; Context-Aware; Location; Positioning System; Ubiquitous System;
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