TRAC Wireless Localization for Outdoor Environments
The focus of this
is to evaluate robust strategies for wireless localization in
outdoor environments.
There are three key aspects to this work: (i) Uses client cooperation
in large-scale wireless environments, (ii) Multi-modal nature of
localization that integrates WiFi, cellular, and GPS based localization,
(iii) No dependence on explicit
support from cellular technologies.
Currently we are experimenting with signal strength based localization available in
both WiFi and cellular systems.
Here is some initial measurements conducted around our CS building where
localization is being performed using WiFi signal strength estimates.
The following is the error distribution over time for this WiFi based localization system.
The user walked from Dayton Street to Spring Street and localized himself using WiFi and compared
performance to GPS based localization.
There are 57 localization points (marked using squares) and are connected in time order.
For example, the first point of red line is in the same time as the first point of green line, so
is the second points, third points, ...
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