1. Introduction
2. Our approach
2.1 Positioning for visible light communication
Visible light communication | Wireless LAN | RFID | |
---|---|---|---|
Position accuracy | several meters | several meters to several hundred meters | several meters |
Quality | stable | dependence of noise, interference | dependence of noise, interference |
Measurement time | less than a second | several seconds | less than a second |
Recognition of building floors | possible | difficult | possible |
Measurement Device | visible light receiver | Wi-Fi transceiver | RFID reader |
Research specification | CP-1222 | |
---|---|---|
Subcarrier frequency | - | 28.8[kHz] |
Transfer rate | 4.8[kbps] | 4.8[kbps] |
Modulation Method | 4PPM | SC 4PPM |
Data flame | 128bits | 512bits |
2.2 Creation of indoor map data
2.3 Compensated geomagnetic sensing
3. Development of indoor navigation system
3.1 Indoor navigation system design
Direction | Distance | Action | Conjunction |
---|---|---|---|
to 1 o’clock | about 1 meter | please move on | next |
to 2 o’clock | about 2meter | please return | then |
to 3 o’clock | about 3 meter | please turn | |
to 4 o’clock | about 4 meter | last[distance] | |
to 5 o’clock | about 5 meter | here we are | |
to 6 o’clock | about 6 meter | ||
to 7 o’clock | about 7 meter | ||
to 8 o’clock | about 8 meter | ||
to 9 o’clock | about 9 meter | ||
to 10 o’clock | about 10 meter | ||
to 11 o’clock | about 15meter | ||
to 12 o’clock | about 20 meter |
3.2 Implementation of indoor navigation system
Personal computer | Intel Core2 Duo processor P8700(2.53GHz) |
---|---|
OS | Microsoft Windows XP Professional |
IDE | Eclipse3.7.1 , Android Development Tools, JDK6.X or better |
Smartphone | Panasonic P-07C CPU OMAP3630 1.0GHz |
OS | Android 2.3 |
4. The verification test and result
4.1 The verification test
Period | Feb.14-15 2012 | ||
Area | ATC Ageless Center, OSAKA | ||
Subject | A; woman | age range 50–60 | low vision |
B; woman | age range 60–70 | low vision | |
C; man | age range 60–70 | blind | |
D; woman | age range 60–70 | blind | |
E; woman | age range 50–60 | blind | |
F; man | age range 60-70 | low vision | |
Content | Experience and interview | ||
Course | Front - toilet (about 5min) | ||
Instrument | Visible light communication ID transfer(LED light), receiver all-in-one smartphone (P-07C/Panasonic), Headphone(SENNHEISER) |
4.2 Result of verification test
4.3 Interviews
Suggestion of navigation function (position, direction, distance) | |
---|---|
A | It is difficult to decide the superiority or inferiority of guidance by the clock position and eight directions. |
B | The distance to the destination was found well. |
C | It should show the direction of movement always more correctly. The guidance should synchronize with the walking speed. |
D | It should support, when a direction of movement changes quickly (ex; the obstacle, bump to a person). |
E | I would like to always check whether it is walking correctly to a course. |
F | I was not able to memorize guidance to the destination, however I have imagined it. |