NaviMe: The Indoor Tour Guide System
Amber Imam, Wai Yong Low, Rashmi Sanbhadti, Sudeep Yegnashankaran
Motivation
Architecture
Current navigation systems such as GPS are only for outdoors. Buildings
may be confusing to navigate through, and tour guides can be
frustrating to deal with. Wouldn’t it be nice if you could have your own
tour guide that gave information about locations only you were
interested in?
-User starts application on Nokia N95
-N95 detects nearby routers and signal
strengths
-N95 accesses database to gather
information about location
Objective:
The application will give an informative description about the current location
of the user based on surrounding wireless routers. This information is useful for
many people at Carnegie Mellon, including visitors or prospective students.
However, the NaviMe system can be extended to any collection of buildings
with a wireless network.
Hardware
-Nokia N95
-Wireless Routers
-Initially: Bluetooth (via Gumstix)
Software
-Symbian C++
-Carbide
-Nuance TALKS
Results
Boxplot of Router Points at Location 1
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:c 1: 9 a:9 e: 7 7: 6
:c 8: 9 7:8 d: e 1: c 9:a
:0 1: 9 a:b
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: 3 8:1 a: 7 a: 7 a:7 a: 7 a:7 a: 7 3: 0 3:1 3: 1 a:e
:9 8: b
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:1 9: 1 9:1 9: 1 9:1
:3 d: 3 d:3 9: 7
:1
f: 9 f0:6
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6: 16:
9: : 1b :1c
15 :15 : 15 : 15 :15 :16
02 : 0f
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The graph shows the routers detected and
their respective signal strengths for a
specific position. The greater the variance in
signal strength, the lower the reliability of
the router. We used the most reliable
routers to pinpoint the user’s location.
List of Detected Routers
Why not use Bluetooth to help fine-tune
localization?
Bluetooth signal was inconsistent and varied greatly.
For our purposes, the range of the Bluetooth was too
large, and the time to detect surrounding Bluetooth
beacons was too long for a real-time system. Hence,
we decided to use just WiFi to detect our position.
Bluetooth Signal Degradation wrt Increased
Dampening
2500
2000
Range (cm)
Development Environment
-User is notified of location and given a
description
Signal Strenth %
To design an indoor tour guide system that will pinpoint
places of interest within a building and help inform the
user about where he/she is.
1500
1000
500
0
0
1
2
3
Length of Foil (cm)
We collected signal strengths and router locations to give users information about
locations in Newell Simon, Wean, and Porter Hall.
http://www.ece.cmu.edu/~ece549/spring08/team2
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