| Techreport |
| Type of Publication |
| COMPASS: A Probabilistic Indoor Positioning System Based
on 802.11 and Digital Compasses |
| Title |
|
Christian Lubberger
|
| Authors |
| Technical Report TR-2006-012, Department for Mathematics and Computer Science,
University of Mannheim, 12. June 2006 |
| Published in |
| Positioning systems are one of the key
elements required by context-aware application and location-based
services. This paper presents the design, implementation and
anaylsis of a positioning system called COMPASS which is based on
802.11 compliant network infrastructure and digital compasses. On
the mobile device, COMPASS samples the signal strength values of
different access points in communication range and utilizes the
orientation of the user to preselect a subset of the training
data. The remaining training data is used by a probabilistic
position determination algorithm to determine the position of the
user. While prior systems show only limited accuracy due to
blocking effects caused by human bodies, we apply digital
compasses to detect the orientations of the users so that we can
handle these blocking effects. After a short period of training
our approach achieves an average error distance of less than
1.65~meters in our experimental environment of 312 square
meters. |
| Abstract |
|
| Projects |
|
Positioning systems
Wireless-LAN (802.11)
Location systems
Digital compass
Mobile Business
Context-aware applications
Location-based services
|
| Keywords |
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