发明名称 |
Position detection system, position detection method therefor, position detection communication device, and communication device |
摘要 |
In a position detection system, a plurality of first communication devices each comprise a transmitter for transmitting a distance-calculation signal for calculating distance to the second communication device; a detector for detecting, by receiving from the second communication device a signal corresponding to the distance-calculation signal, phase difference between the distance-calculation signal when transmitted and the signal corresponding to the distance-calculation signal when received; and a calculator for calculating the distance to the second communication device, based on the phase difference. A second communication device comprises a transmitter for transmitting the signal corresponding to the distance-calculation signal. The position detection system comprises a determining unit for determining whether the multiple distances are below a predetermined distance; and a position detector for detecting the position of a relay device corresponding to the multiple distances when the determining unit has determined that the multiple distances are at or above the predetermined distance.
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申请公布号 |
US2006094350(A1) |
申请公布日期 |
2006.05.04 |
申请号 |
US20050254028 |
申请日期 |
2005.10.18 |
申请人 |
SANYO ELECTRIC CO., LTD. |
发明人 |
ISHIMURA SHIZUKA;IKETANI AKIRA |
分类号 |
H04B17/02;G01S7/40;G01S13/08;G01S13/46;H04W4/04;H04W64/00 |
主分类号 |
H04B17/02 |
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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