Comparison of WiFi-based indoor positioning techniques

Indoor positioning systems is an actively researched area of computer science. Various techniques, methods and applications were developed in the last decade. This paper gives a brief comparison of trilateriation and fingerprinting techniques. Received signal strength of WiFi access points were used during the tests. Standard, genetic algorithm and simulated annealing based trilateriation methods were implemented. Fingerprinting methods were based on nearest neighbor approach. Correlation coefficient and euclidean distance were used to calculate distance of the actual and the stored measurements. Experimental results showed that approximately 3–4 meter accuracy can be achieved with the tested methods.