On the use of Galileo SIS and Cellular signals for identification of an hybrid positioning system

Mobile emergency calls need accurate automatic location information. At the present time, several emergency calls are unserved due to the absence of sufficient location information. Regulamentory recommendations and the necessity of providing added value services are driving towards the design of mobile user terminals with improved capabilities, and able to match suitable accuracy requirements. In this paper the positioning accuracy improvement by means of a joint use of Global Navigation Satellite Systems and measurements from Base Transceiver Stations of the cellular network is discussed. A theoretical framework is derived and simulation results are shown in order to demonstrate the performance improvement with respect to pure cellular location techniques.