1. Dorobantu R, Zebhauser B (1999) Field Evaluation of a Low-Cost Strapdown IMU by means GPS. Ortung und Navigation 1/1999, DGON, Bonn, 51-65, see also at
http://www.imarnavigation. de/download/iapg_2.pdf
(Last accessed: June 2008).
2. Fu Q (2008) Active RFID for Positioning Using Trilateration and Location Fingerprinting Based on RSSI. in: Papers presented at the ION GNSS 2008 Conference, September 16-19, 2008, Savannah, Georgia, USA, CD-Rom Proceedings.
3. Kaemarungsi K (2005). Design of Indoor Positioning Systems Based on Location Fingerprinting Technique, Dissertation, University of Pittsburgh, see
http://etd.library. pitt.edu/ETD/available/etd-02232005-235903/unrestricted/dissertation28Feb05.pdf
(Last accessed: June 2008).
4. Matlab (2007) Control System Toolbox$^{\rm 8.1, Kalman Filter Design.
http://www.mathworks. com/products/control/demos.html?file=/products/demos/shipping/control/kalmdemo. html
(Last accessed: June 2008).
5. Retscher G, Moser E, Vredeveld D, Heberling D, Pamp J (2007) Performance and Accuracy Test of a WiFi Indoor Positioning System, Journal of Applied Geodesy, Vol. 1, No. 2, pp. 103-110.