发明名称 |
TRANSFER OF CALIBRATED TIME INFORMATION IN A MOBILE TERMINAL |
摘要 |
A method of and system for calibrating un-calibrated time information within a mobile terminal 101 is disclosed. The terminal has a receiver 203 capable of receiving signals from which calibrated time information carried by a calibrated system (a satellite positioning system) can be extracted, and a receiver 200 capable 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 syst em 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 a re available. The un-calibrated time information extracted from signals of the un- calibrated stable system received at a second terminal position, is calibrat ed 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. |
申请公布号 |
CA2554336(A1) |
申请公布日期 |
2005.08.04 |
申请号 |
CA20052554336 |
申请日期 |
2005.01.21 |
申请人 |
CAMBRIDGE POSITIONING SYSTEMS LIMITED |
发明人 |
BARTLETT, DAVID WILLIAM;DUFFETT-SMITH, PETER JAMES;PRATT, ANTHONY RICHARD |
分类号 |
G01S1/02;G01S5/00;G01S5/10;G01S19/05;G01S19/06;G01S19/12;G01S19/24;G01S19/25;G01S19/26;H04B17/00 |
主分类号 |
G01S1/02 |
代理机构 |
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代理人 |
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主权项 |
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地址 |
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