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G. Retscher, Y. Li, A. Kealy, H. Hofer, J. Gabela, S. Goel, O. Qureshi, E. Smith, L. Bao:
"Real-time Wi-Fi RSS Variation Correction Using a Network Differential Positioning Approach";
Poster: 9th International Conference Indoor Positioning and Indoor Navigation IPIN 2018, Nantes, France (invited); 09-24-2018 - 09-27-2018; in: "9th International Conference Indoor Positioning and Indoor Navigation IPIN 2018", (2018), 1 - 4.

This paper presents an approach for real-time correction of Wi-Fi Received Signal Strength (RSS) variations and fluctuations to improve indoor localization by continuously updating the fingerprint database. For that purpose, a Differential Wi-Fi (DWi-Fi) scheme by analogy to Differential GNSS is developed and applied where reference station (RS) measurements are employed for a network calibration method. Hence, the recorded RSS measurements at the user´s end are corrected and the fingerprinting database is continuously updated to account for the possible changes in the dynamics of the environment. The RSS properties stability, variability and visibility of the RSS values are analyzed to estimate the resulting effects of spatial and temporal RSS variations. For this investigation, both static and kinematic tests in an indoor environment using different mobile devices were carried out. They could prove the performance improvement compared to common approaches if continuous RSS measurements are conducted at RSs deployed in the area of interest.

Analysis of spatial and temporal variations, Area correction parameters, Differential Wi-Fi localization (DWi-F), Networked approach, Real-time calibration, RSS properties

https://publik.tuwien.ac.at/files/publik_272848.pdf