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TitleInfluence of measured radio map interpolation on indoor positioning algorithms
Author(s)Bravenec, Tomas
Gould, Michael
Fryza, Tomas
Torres-Sospedra, Joaquín
KeywordsFingerprint recognition
Indoor localization
Indoor positioning
IP networks
Location awareness
Radio Map
Wireless communication
Wireless fidelity
radio map (RM)
received signal strength indicator (RSSI)
Issue date2023
PublisherInstitute of Electrical and Electronics Engineers (IEEE)
JournalIEEE Sensors Journal
Abstract(s)Indoor positioning and navigation increasingly has become popular and there are many different approaches, using different technologies. In nearly all of the approaches the locational accuracy depends on signal propagation characteristics of the environment. What makes many of these approaches similar is the requirement of creating a signal propagation Radio Map (RM) by analysing the environment. As this is usually done on a regular grid, the collection of Received Signal Strength Indicator (RSSI) data at every Reference Point (RP) of a RM is a time consuming task. With indoor positioning being in the focus of the research community, the reduction in time required for collection of RMs is very useful as it allows researchers to spend more time with research instead of data collection. In this paper we analyse the options for reducing the time required for the acquisition of RSSI information. We approach this by collecting initial RMs of Wi-Fi signal strength using 5 ESP32 micro controllers working in monitoring mode and placed around our office. We then analyse the influence the approximation of RSSI values in unreachable places has, by using linear interpolation and Gaussian Process Regression (GPR) to find balance between final positioning accuracy, computing complexity, and time requirements for the initial data collection. We conclude that the computational requirements can be significantly lowered, while not affecting the positioning error, by using RM with a single sample per RP generated considering many measurements.
Publisher version
AccessOpen access
Appears in Collections:CAlg - Artigos em revistas internacionais / Papers in international journals

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