Nowadays, navigation systems have become an integral part of everyday life. But since GNSS-based systems do not work in locations where GNSS signals cannot be received, a navigation solution can offer an interesting solution in such places - such as at congresses, in shopping malls, at train stations or in large office buildings. The HafenCity University in Hamburg, Germany, started exploring the possibilities of indoor navigation solutions in 2009, and especially in conjunction with smartphones since 2011. In order to devise a successful indoor navigation solution, it is important to understand the quality of smartphones' integrated sensors. This article describes initial studies of the gyroscope and the barometer in the test smartphone, a Samsung Galaxy Nexus. It outlines a method for calibrating the gyroscope with a total station. Finally, the pressure from the barometer is used to identify different storeys in the HCU building.
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