Transfer of calibrated time information in a mobile terminal

Details Transfer of calibrated time information in a mobile terminal Transfer of calibrated time information in a mobile terminal

2006-07-25

2010-12-14

Tarcza, Thomas H (Department: 3662)

Communications: directive radio wave systems and devices (e.g.,

Directive

Position indicating

Reexamination Certificate

active

07852267

ABSTRACT:
A method of and system for calibrating un-calibrated time information within a mobile terminal101is disclosed. The terminal has a receiver203capable of receiving signals from which calibrated time information carried by a calibrated system (a satellite positioning system) can be extracted, and a receiver200capable of receiving signals from which un-calibrated time information carried by an un-calibrated stable system (a cellular communications system) may be extracted. The time offset between calibrated time information extracted from the calibrated system and un-calibrated time information extracted from the un-calibrated stable system is determined at a first terminal position where the signals from the un-calibrated stable system are available, the travel times of the signals from the un-calibrated stable system are known or determined, and the signals from the calibrated system are available. The un-calibrated time information extracted from signals of the un-calibrated stable system received at a second terminal position, is calibrated from known or determined travel times of the signals from the un-calibrated stable system at the second terminal position and the time offset which has been determined.

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