Global Positioning System (GPS) is used for vehicle location systems. When it detects less than four satellites, it will fail to determine the location of the vehicle. This happens mainly in crowded areas such as downtown areas where the buildings block the line of sight between the receiver and some of the satellites. When this happens the vehicle requires a more reliable system to depend on, this will be the GSM network. The proposed system makes use of the coverage of the GSM to determine the differential distance between the last known good location given by the GPS system and the current position of the vehicle. A prediction filter and a mathematical model is used to find this differential distance. This method does not require an upgrade for the GSM equipment. Experimental results showed that the authors could obtain the location in the shadowed areas to about 50 meters of error. This accuracy depends on the GSM environment and the differential nature of the reading.
Position enhancement technique using GPS-GSM model for vehicle location systems
Verbesserung der Positionsbestimmung mittels eines GPS-GSM-Modells für Fahrzeugortungssysteme
2007
4 Seiten, 6 Bilder, 11 Quellen
Conference paper
English
Integrated automatic vehicle location and position reporting system
Tema Archive | 1989
|Integrated automatic vehicle location and position reporting system
Automotive engineering | 1989
|