Patent ID: 6282426
Filing Date: 2001-08-28
Classification: G01S

Abstract:
Apparatus for determining geographic positioning of a mobile station operable in a radio communication system installed to encompass a geographical area and in which the mobile station receives at least a first TOA (time-of-arrival) signal generated by a first TOA-signal-source, said apparatus comprising:a zonal portion determiner coupled to receive indications of at least information related to the first TOA-signal received at the mobile station, said zonal portion determiner for determining a zonal portion of the geographical area encompassed by the radio communication system in which the mobile station is positioned;a ray tracer operable responsive to determinations made by said zonal portion determiner of the zonal portion in which the mobile station is positioned, said ray tracer for simulating ray paths from each of the at least first TOA-signal source; anda mobile station position determiner coupled to receive values representative of simulated ray paths generated by said ray tracer, said mobile station position determiner for determining an actual position of the mobile station responsive to the values representative of the simulated ray paths.