发明名称 |
Location estimation in narrow bandwidth wireless communication systems |
摘要 |
The phase difference between a known stable reference signal (11) and a known signal output by a wireless mobile communication device (5, 5B) is determined at several known locations (1-4, 1B-4B). The location of the wireless mobile communication device is then determined from the phase difference information. Also, the approximate location of a wireless mobile communication device (5A) can be estimated by transmitting a message from the device at a predetermined power level (71), and determining where among a plurality of predetermined locations (1A-4A) the transmitted message has been received.
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申请公布号 |
US6700535(B2) |
申请公布日期 |
2004.03.02 |
申请号 |
US20010872598 |
申请日期 |
2001.06.01 |
申请人 |
TEXAS INSTRUMENTS INCORPORATED |
发明人 |
GILKES ALAN M.;PANASIK CARL M. |
分类号 |
G01S5/06;H04W64/00;(IPC1-7):G01S1/24 |
主分类号 |
G01S5/06 |
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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