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    Two-frequency Doppler distance measuring apparatus and detection system having the apparatus
    2.
    发明申请
    Two-frequency Doppler distance measuring apparatus and detection system having the apparatus 审中-公开
    具有该装置的双频多普勒测距装置和检测系统

    公开(公告)号：US20050078029A1

    公开(公告)日：2005-04-14

    申请号：US10938757

    申请日：2004-09-10

    申请人： Shinichiro Okamura ,  Takehiro Kawai ,  Keisuke Saito

    发明人： Shinichiro Okamura ,  Takehiro Kawai ,  Keisuke Saito

    IPC分类号： A47K4/00 ,  G01S13/50 ,  G01S13/52 ,  G01S13/56 ,  G01S13/58

    CPC分类号： G01S13/52 ,  G01S13/584

    摘要： A technique is disclosed for accurate measurement of the distance and detection of an object such as a human body behaving in a complicated way and having a complicated reflection surface using the two-frequency Doppler method. Each of the two-frequency Doppler signals is subjected to the short time Fourier transform to produce a spectrum in a short time window. Based on restraints, it is determined whether the waveforms of the two spectra are analogous to each other or not, and only in the case where the waveforms are analogous, the Doppler signals of the particular time window are used for distance calculation. As a result, the Doppler signals having the phase information low in reliability are eliminated, and therefore high-accuracy distance measurement and object detection are possible.

    摘要翻译： 公开了一种用于精确测量距离的检测技术，并且以复杂的方式检测诸如人体的物体，并且使用双频多普勒方法具有复杂的反射面。 对双频多普勒信号进行短时傅里叶变换，以在短时间窗内产生频谱。 基于约束，确定两个光谱的波形是否彼此相似，并且仅在波形类似的情况下，将特定时间窗口的多普勒信号用于距离计算。 结果，消除了具有低可靠性的相位信息的多普勒信号，因此可以进行高精度的距离测量和物体检测。

    RFID tag distance measuring system and reader
    6.
    发明授权
    RFID tag distance measuring system and reader 有权
    RFID标签测距系统和阅读器

    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。

    RFID tag distance measuring system and reader
    7.
    发明申请
    RFID tag distance measuring system and reader 有权
    RFID标签测距系统和阅读器

    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。

    Distance measuring apparatus, distance measuring method, reflector, and communication system
    8.
    发明授权
    Distance measuring apparatus, distance measuring method, reflector, and communication system 有权
    距离测量装置，测距方法，反射器和通讯系统

    公开(公告)号：US07903022B2

    公开(公告)日：2011-03-08

    申请号：US12628620

    申请日：2009-12-01

    申请人： Hideyuki Ohara ,  Takehiro Kawai ,  Keisuke Saito ,  Kosuke Hayama

    发明人： Hideyuki Ohara ,  Takehiro Kawai ,  Keisuke Saito ,  Kosuke Hayama

    IPC分类号： G01S3/08

    CPC分类号： G01S13/84 ,  G01S13/38 ,  H04B5/0056 ,  H04B5/0062 ,  H04B17/27

    摘要： A transmission controller 7B is configured to transmit an R/W request signal for requesting transmission of a tag response signal to a RFID tag 1 twice. At this time, a frequency controller 7A controls a PLL section 5A to transmit the R/W request signal via different carrier frequencies. A phase information acquirer 8A detects a phase change amount of the tag response signal that is transmitted via different carrier frequencies. A distance calculator 8B calculates the distance between the reader/writer 2 and the RFID tag 1 on the basis of the phase change amount.

    摘要翻译： 发送控制器7B被配置为向RFID标签1发送用于请求发送标签响应信号的R / W请求信号两次。 此时，频率控制器7A控制PLL部5A，经由不同的载波频率发送R / W请求信号。 相位信息获取器8A检测经由不同载波频率发送的标签响应信号的相位变化量。 距离计算器8B基于相位变化量来计算读取器/写入器2和RFID标签1之间的距离。

    Distance measuring apparatus, distance measuring method, reflector and communication system
    9.
    发明授权
    Distance measuring apparatus, distance measuring method, reflector and communication system 有权
    距离测量仪器，测距方法，反射器和通讯系统

    公开(公告)号：US07649491B2

    公开(公告)日：2010-01-19

    申请号：US11885973

    申请日：2005-09-01

    申请人： Hideyuki Ohara ,  Takehiro Kawai ,  Keisuke Saito ,  Kosuke Hayama

    发明人： Hideyuki Ohara ,  Takehiro Kawai ,  Keisuke Saito ,  Kosuke Hayama

    IPC分类号： G01S3/08

    CPC分类号： G01S13/84 ,  G01S13/38 ,  H04B5/0056 ,  H04B5/0062 ,  H04B17/27

    摘要： A transmission controller 7B is configured to transmit an R/W request signal for requesting transmission of a tag response signal to a RFID tag 1 twice. At this time, a frequency controller 7A controls a PLL section 5A to transmit the R/W request signal via different carrier frequencies. A phase information acquirer 8A detects a phase change amount of the tag response signal that is transmitted via different carrier frequencies. A distance calculator 8B calculates the distance between the reader/writer 2 and the RFID tag 1 on the basis of the phase change amount.

    摘要翻译： 发送控制器7B被配置为向RFID标签1发送用于请求发送标签响应信号的R / W请求信号两次。 此时，频率控制器7A控制PLL部5A，经由不同的载波频率发送R / W请求信号。 相位信息获取器8A检测经由不同载波频率发送的标签响应信号的相位变化量。 距离计算器8B基于相位变化量来计算读取器/写入器2和RFID标签1之间的距离。

    Distance Measuring Apparatus, Distance Measuring Method, Reflector and Communication System
    10.
    发明申请
    Distance Measuring Apparatus, Distance Measuring Method, Reflector and Communication System 有权
    距离测量装置，距离测量方法，反射器和通信系统

    公开(公告)号：US20080150699A1

    公开(公告)日：2008-06-26

    申请号：US11885973

    申请日：2005-09-01

    申请人： Hideyuki Ohara ,  Takehiro Kawai ,  Keisuke Saito ,  Kosuke Hayama

    发明人： Hideyuki Ohara ,  Takehiro Kawai ,  Keisuke Saito ,  Kosuke Hayama

    IPC分类号： H04B5/02 ,  G06K17/00 ,  G01S13/74 ,  G01S13/38 ,  H04B1/58

    CPC分类号： G01S13/84 ,  G01S13/38 ,  H04B5/0056 ,  H04B5/0062 ,  H04B17/27

    摘要： A transmission controller 7B is configured to transmit an R/W request signal for requesting transmission of a tag response signal to a RFID tag 1 twice. At this time, a frequency controller 7A controls a PLL section 5A to transmit the R/W request signal via different carrier frequencies. A phase information acquirer 8A detects a phase change amount of the tag response signal that is transmitted via different carrier frequencies. A distance calculator 8B calculates the distance between the reader/writer 2 and the RFID tag 1 on the basis of the phase change amount.

    摘要翻译： 发送控制器7B被配置为向RFID标签1发送用于请求发送标签响应信号的R / W请求信号两次。 此时，频率控制器7A控制PLL部分5A以经由不同的载波频率发送R / W请求信号。 相位信息获取器8A检测经由不同载波频率发送的标签响应信号的相位变化量。 距离计算器8B基于相位变化量计算读取器/写入器2与RFID标签1之间的距离。