公开(公告)号：US07714773B2

公开(公告)日：2010-05-11

申请号：US11727777

申请日：2007-03-28

申请人： Tomohiro Ozaki ,  Hideyuki Ohara ,  Takehiro Kawai ,  Keisuke Saito

发明人： Tomohiro Ozaki ,  Hideyuki Ohara ,  Takehiro Kawai ,  Keisuke Saito

IPC分类号： G01S13/08

CPC分类号： G01S13/84

摘要： An RFID tag distance measuring system includes a reader that outputs a predetermined carrier signal to a tag and receives a reflected signal of the carrier signal from the tag. The reader has signal output means for outputting signals at multiple frequencies, which are different from each other, as the carrier signal, a transmitting section that transmits a signal output by the signal output means to the tag, a receiving section that receives reflected signals of the signals at multiple frequencies, which are different from each other, from the tag and estimating means for estimating the distance between the tag and the reader based on the amount of change in phase between the reflected signals received by the receiving section and the carrier signals and the frequencies of the carrier signals. The transmitting section and the receiving section have two pairs of transmit and receive antennas that obtain multiple receive signals in which the strengths of the reflected signals vary differently when the receiving section receives the reflected signals.

摘要翻译： RFID标签距离测量系统包括：读取器，其将预定载波信号输出到标签，并从标签接收载波信号的反射信号。 读取器具有信号输出装置，用于输出多个频率彼此不同的信号，作为载波信号，将由信号输出装置输出的信号发送到标签的发送部分，接收部分，其接收反射信号 基于由接收部分接收的反射信号与载波信号之间的相位变化量来估计标签与读取器之间的距离的标签和估计装置的不同频率的信号彼此不同; 和载波信号的频率。 发送部分和接收部分具有获得多个接收信号的两对发射和接收天线，其中当接收部分接收到反射信号时反射信号的强度变化不同。

公开(公告)号：US20070241904A1

公开(公告)日：2007-10-18

申请号：US11727777

申请日：2007-03-28

申请人： Tomohiro Ozaki ,  Hideyuki Ohara ,  Takehiro Kawai ,  Keisuke Saito

发明人： Tomohiro Ozaki ,  Hideyuki Ohara ,  Takehiro Kawai ,  Keisuke Saito

IPC分类号： G08B13/14 ,  G01S13/08 ,  G08B1/08

CPC分类号： G01S13/84

摘要： An RFID tag distance measuring system includes a reader that outputs a predetermined carrier signal to a tag and receives a reflected signal of the carrier signal from the tag. The reader has signal output means for outputting signals at multiple frequencies, which are different from each other, as the carrier signal, a transmitting section that transmits a signal output by the signal output means to the tag, a receiving section that receives reflected signals of the signals at multiple frequencies, which are different from each other, from the tag and estimating means for estimating the distance between the tag and the reader based on the amount of change in phase between the reflected signals received by the receiving section and the carrier signals and the frequencies of the carrier signals. The transmitting section and the receiving section have two pairs of transmit and receive antennas that obtain multiple receive signals in which the strengths of the reflected signals vary differently when the receiving section receives the reflected signals.

摘要翻译： RFID标签距离测量系统包括：读取器，其将预定载波信号输出到标签，并从标签接收载波信号的反射信号。 读取器具有信号输出装置，用于输出多个频率彼此不同的信号，作为载波信号，将由信号输出装置输出的信号发送到标签的发送部分，接收部分，其接收反射信号 基于由接收部分接收的反射信号与载波信号之间的相位变化量来估计标签与读取器之间的距离的标签和估计装置的不同频率的信号彼此不同; 和载波信号的频率。 发送部分和接收部分具有获得多个接收信号的两对发射和接收天线，其中当接收部分接收到反射信号时反射信号的强度变化不同。