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G. Retscher:
"3-D Location Determination in Multi-storey Buildings";
European Journal of Navigation, 4 (2006), 3; 49 - 54.

Using pedestrian navigation and guidance services in indoor areas, a challenging task is to determine the correct floor of a user in a multi-storey building as most common indoor location techniques provide only 2-D position determination. In this case it can be recommended to augment the position determination system with a barometric pressure sensor for direct observation of height differences. In the research project NAVIO (Pedestrian Navigation Systems in Combined Indoor/Outdoor Environements) tests with different sensors have been performed and their results are presented in the paper. The tests show that it is possible to determine the correct floor of a user using a barometric pressure sensor as the standard deviation of the estimation of the height differences is better than  1 m.

http://aleph.ub.tuwien.ac.at/F?base=tuw01&func=find-c&ccl_term=AC06586666

Project Head Georg Gartner:
Fußgängernavigation in Gebäuden und im städtischen Umfeld