Q. Fu, G. Retscher:
"Another Look Indoors";
GPS World (invited), 20 (2009), 3; 40 - 43.
Radio-frequency identification (RFID) shows promise for positioning in complex environments, in combination with GNSS signals. The authors demonstrate a combination of RFID cell-based, trilateration, and fingerprinting, and propose an intelligent software system to automatically switch between the three.
http://uc.gpsworld.com/gpsuc/Personal+Navigation/GPS---RFID/ArticleStandard/Article/detail/585103
Project Head Georg Gartner:
Ubiquitäre Kartographie für Fußgängernavigation