International Global Navigation Satellite Systems Association
IGNSS Symposium 2018
Colombo Theatres, Kensington Campus, UNSW Australia
7 – 9 February 2018
Wi-Fi Positioning Using a Network Differential
Approach for Real-time Calibration
Guenther Retscher
TU Wien – Vienna University of Technology
Phone: +43 1 58801 12847, Fax: +43 1 58801 12894
guenther.retscher@geo.tuwien.ac.at
Yan Li
The University of Melbourne
liy19@student.unimelb.edu.au
Simon Williams
RMIT University
Phone: +61 3 9925 1631
simon.williams2@rmit.edu.au
Allison Kealy
RMIT University
Phone: +61 3 9925 1261
allison.kealy@rmit.edu.au
Bill Moran
The University of Melbourne
Phone: +61 3 8344 4000
wmoran@unimelb.edu.au
Salil Goel
The University of Melbourne
sgoel1@student.unimelb.edu.au
Jelena Gabela
The University of Melbourne
jgabela@student.unimelb.edu.au
ABSTRACT
For Wi-Fi (Wireless Fidelity) Received Signal Strength (RSS) based indoor
positioning, fingerprinting is one of the widely-employed methods which
can offer relatively high positioning accuracy. However, conventional
fingerprinting methods normally do the site survey once, which is not
resistant to the dynamic environment change. Continuously updating the
fingerprint database is a promising way to enhance the achievable
positioning accuracy. For that purpose, a Differential Wi-Fi (DWi-Fi)
scheme by analogy to DGPS is developed and applied.
DWi-Fi is a network calibration method based on reference station
measurements, which is able to derive the area correction parameters in the
triangle network of the three reference station. In this way, the recorded RSS
measurements at the user’s end are corrected, the fingerprinting database is
