The active badge location system
ACM Transactions on Information Systems (TOIS)
Numerical recipes in C (2nd ed.): the art of scientific computing
Numerical recipes in C (2nd ed.): the art of scientific computing
The anatomy of a context-aware application
MobiCom '99 Proceedings of the 5th annual ACM/IEEE international conference on Mobile computing and networking
The Cricket location-support system
MobiCom '00 Proceedings of the 6th annual international conference on Mobile computing and networking
Access Point Height Based Location Accuracy Characterization in LOS and OLOS Scenarios
Wireless Personal Communications: An International Journal
Locating schemes based on adaptive weighting strategy in heterogeneous wireless networks
International Journal of Ad Hoc and Ubiquitous Computing
Locating schemes based on adaptive weighting strategy in heterogeneous wireless networks
International Journal of Ad Hoc and Ubiquitous Computing
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Indoor wireless network based client localisation requires the use of a radio map to relate received signal strength to specific locations. However, signal strength measurements are time consuming, expensive and usually require unrestricted access to all parts of the building concerned. An obvious option for circumventing this difficulty is to estimate the radio map using a propagation model. This paper compares the effect of measured and simulated radio maps on the accuracy of two different methods of wireless network based localisation. The results presented indicate that, although the propagation model used underestimated the signal strength by up to 15 dB at certain locations, there was not a signigicant reduction in localisation performance. In general, the difference in performance between the simulated and measured radio maps was around a 30% increase in rms error.