发明名称 |
Communication processing apparatus and distance measuring method for communication processing apparatus |
摘要 |
A communication processing apparatus alternately transmits a carrier wave carrying a command and receives a response from a tag while transmitting an unmodulated carrier wave. A transmission control unit changes the phase of the unmodulated carrier wave transmitted from a transmission/reception circuit in response to start of reception of the reflected wave from the tag. The transmission/reception circuit includes a circuit for separating and detecting an I signal and a Q signal included in the reflected wave from the tag. A phase detection unit uses the I signal and the Q signal to detect change of the phase of the reflected wave. A distance calculation unit measures a time from a change of the phase of the unmodulated carrier wave to a detection of a corresponding change in the phase of the reflected wave, and uses the time to calculate the distance from the antenna to the tag. |
申请公布号 |
US8717227(B2) |
申请公布日期 |
2014.05.06 |
申请号 |
US201113297726 |
申请日期 |
2011.11.16 |
申请人 |
NOGAMI HIDEKATSU;KASAI HIROKAZU;MATSUI SHUICHI;OMRON CORPORATION |
发明人 |
NOGAMI HIDEKATSU;KASAI HIROKAZU;MATSUI SHUICHI |
分类号 |
G01S13/00 |
主分类号 |
G01S13/00 |
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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