| Conference |
| Type of Publication |
| COMPASS: A Probabilistic Indoor Positioning System Based
on 802.11 and Digital Compasses |
| Title |
|
Christian Lubberger
|
| Authors |
| Proc. of the First ACM International Workshop on
Wireless Network Testbeds, Experimental evaluation and
CHaracterization (WiNTECH 2006), pp.
34-40, Los Angeles, CA, USA, September 2006 |
| Published in |
| Positioning systems are one of the key
elements required by location-based services. This paper presents
the design, implementation and analysis 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 its 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 positioning
algorithm to determine the position of the user. While prior
systems show limited accuracy due to blocking effects caused by
the human body, we apply digital compasses to detect the
orientations of the users so that we can deal with these blocking
effects. After a short period of training our COMPASS system
achieves an average error distance of less than 1.65 meters in
our experimental environment of 312 square meters. |
| Abstract |
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