초록 ▼

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.

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.

대표청구항 ▼

1. A system for synchronizing time of arrival measurements made within a wireless communication device to global positioning system (GPS) time, comprising:a) a receiver configured to receive: i) time of arrival measurements made at the wireless communication system; and ii) signals from an external

1. A system for synchronizing time of arrival measurements made within a wireless communication device to global positioning system (GPS) time, comprising:a) a receiver configured to receive: i) time of arrival measurements made at the wireless communication system; and ii) signals from an external source synchronized to GPS time, the signals received from the external source including an indication from which the amount of delay encountered by a signal transmitted between the external source and the wireless communication device can be determined; and b) processing circuitry configured to adjust the received time of arrival measurements by an amount equal to the delay encountered by a signal transmitted between the external source and the wireless communication device.