METHOD AND APPARATUS FOR POSITION DETERMINATION USING REDUCED NUMBER OF GPS SATELLITES AND SYNCHRONIZED AND UNSYNCHRONIZED BASE STATIONS

• Main Author: SAMIR S. SOLIMAN
• Format: Patent
• Language: English; Spanish
• Published: 12.02.2003
• Edition: 7
• Subjects: ANALOGOUS ARRANGEMENTS USING OTHER WAVES; DETERMINING DISTANCE OR VELOCITY BY USE OF RADIO WAVES; ELECTRIC COMMUNICATION TECHNIQUE; ELECTRICITY; ELECTRONIC TIME-PIECES; HOROLOGY; LOCATING OR PRESENCE-DETECTING BY USE OF THE REFLECTION ORRERADIATION OF RADIO WAVES; MEASURING; PHYSICS; RADIO DIRECTION-FINDING; RADIO NAVIGATION; TESTING; TRANSMISSION; WIRELESS COMMUNICATIONS NETWORKS

A method and apparatus for determining the position of a wireless communication device using global positioning system (GPS) satellites, base stations synchronized to GPS time and base stations that are unsynchronized with GPS time. The unsynchronized base stations are synchronized with one another. Time of arrival information is adjusted to take into account the fact that wireless communication devices that received GPS time information from a base station receive that information biased by the one-way delay that is encountered by the signal that communicates that information to the wireless communication device. In addition, time difference of arrival information for base stations that are not synchronized to GPS time allows the bias between these base stations GPS time to be eliminated. Un metodo y aparato para determinar la posicion de un dispositivo de comunicacion inalambrico que utiliza satelites de sistema de posicion global (GPS), estaciones base sincronizadas al tiempo de GPS y estaciones base que no se sincronizan con el tiempo de GPS. Las estaciones base no sincronizadas se sincronizan entre si. El tiempo de la informacion de llegada se ajusta para tomar en cuenta el hecho de que los dispositivos de comunicacion inalambricos que recibieron la informacion de tiempo de GPS desde una estacion base reciben esa informacion desviada por el retardo de una via que se encuentra por la senal que comunica esa informacion al dispositivo de comunicacion inalambrico. Ademas, la diferencia de tiempo de la informacion de llegada para las estaciones base que no se sincronizan al tiempo de GPS permite que la desviacion entre el tiempo de GPS de esas estaciones base se eliminen.