Indoor location and communication system for the last-ten-meter information services

Author

Itoh, Hideo ; Nakada, Toyohisa ; Hiratsuka, Shigeyoshi ; Nakamura, Yoshiyuki ; Nishimura, Takuichi ; Kunifuji, Susumu ; Nakashima, Hideyuki ; Iwasaki, Nobuyoshi

Author_Institution

Cyber Assist Res. Center, Nat. Inst. of Adv. Sci. & Technol., Japan

Volume

1

fYear

2003

fDate

28-30 Aug. 2003

Firstpage

482

Abstract

A novel free space locating and communicating system is described for an implementation of indoor location-based information services at the last-ten-meter area. The communication system, named "i-lidar system", is composed of base stations, i-lidars, and handheld communication terminals, My Buttons. Reflectivity modulating communication technique using a corner reflecting device and a liquid crystal light modulator is used to reduce power consumption of the terminal. Direction (position) and transferred data of the terminal are measured by a high-speed machine vision camera and photodetectors. Steered and modulated eye-safe laser beams are used to feed data to the terminals separately. Validity of the i-lidar system is evaluated by human tracking experiments.

Keywords

cameras; information services; laser beams; liquid crystal devices; modulators; optical radar; optical tracking; photodetectors; power consumption; My Button device; communication system; corner reflecting device; free space locating system; handheld communication terminals; human tracking experiments; i-lidar system; indoor location-based information services; last-ten-meter information services; liquid crystal light modulator; machine vision camera; modulated eye-safe laser beams; photodetectors; power consumption reduction; reflectivity modulating communication technique; steered eye-safe laser beams; Base stations; Cameras; Energy consumption; Laser beams; Liquid crystal devices; Machine vision; Optical modulation; Photodetectors; Position measurement; Reflectivity;

fLanguage

English

Publisher

ieee

Conference_Titel

Communications, Computers and signal Processing, 2003. PACRIM. 2003 IEEE Pacific Rim Conference on

Print_ISBN

0-7803-7978-0

Type

conf

DOI

10.1109/PACRIM.2003.1235821

Filename

1235821