positionierung indoor-gps location-based services favendo


Indoor GPS is on the one hand a marketing term, which is to clarify the functionality – and the use – of an Indoornavigation catchily, which helps on the other hand however to uncover the analogies in the functionalities of Indoornavigation via radio technology and GPS-based navigation systems.


In an extremely simplified representation of GPS-based navigation systems, 24 satellites orbit the earth and communicate their exact position to a receiver via radio codes. Each satellite continuously emits its individual code and its individual orbit data.

To determine the position, a receiver must receive signals from at least three satellites simultaneously. GPS receivers can calculate their own position and speed from the signal propagation times. The Global Positioning System is a global navigation satellite system for position determination. It was developed by the US Department of Defense in the 1970s.


Indoors there is hardly any chance of undisturbed GPS reception. However, the smartphone may show a correct position. This is made possible by localization via familiar WLAN networks in the vicinity, which the telephone/smart device uses in addition to the satellites – known as Assisted GPS (A-GPS). At the latest in underground garages or mighty reinforced concrete buildings such as shopping centres or hospital complexes, however, A-GPS is also at an end. A-GPS should not be confused with “indoor GPS”.