Research on Robustness of Location Fingerprint Under Terminal Heterogeneity

Received Signal Strength(RSS) is different when measured by different terminal hardware, which causes poor robustness for the traditional fingerprint RSS. Using the application of Signal Strength Difference(SSD) for indoor reference, a robust SSD location fingerprint is proposed to resolve the problem in this paper. It analyzes the robustness of SSD, RSS and Hyperbolic Location Fingerprint(HLF) theoretically, and with the traditional localization K-Nearest Neighbor(KNN) in an actual Wireless Local Area Network(WLAN) environment, it carries out experiments on the 3 fingerprints, with a same terminal and different terminals, in the training phase and positioning phase. Experimental results show that, compared with RSS and HLF, SSD's robustness is better on against mobile terminal heterogeneity.