发明名称 |
Location systems and cellular communication networks |
摘要 |
A location system for use in a mobile communication network includes base stations which transmit known signals at predetermined times for use in deriving location data; a first transmitting and receiving units; a unit for determining times of arrival of the known signals from each base station at each of the first transmitting and receiving units; a unit for determining times of arrival of the known signals from each base station at a second transmitting and receiving unit at an unknown location; a comparing unit for comparing timing differences between the known signals received at the first transmitting and receiving units and the second transmitting and receiving unit; and location determining unit for determining the location of the second unit. Each of the first transmitting and receiving units includes a unit for deriving its location from a further set of received signals such as GPS signals.
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申请公布号 |
US2004192344(A1) |
申请公布日期 |
2004.09.30 |
申请号 |
US20030374497 |
申请日期 |
2003.02.26 |
申请人 |
NEC CORPORATION |
发明人 |
ORMSON RICHARD |
分类号 |
G01S19/14;G01S5/00;G01S5/14;G01S19/42;H04W64/00;(IPC1-7):H04Q7/20;G01S1/00 |
主分类号 |
G01S19/14 |
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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