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RADIO WAVE PROPAGATION TIME MEASUREMENT CALIBRATION METHOD, DISTANCE MEASURING METHOD, RADIO WAVE PROPAGATION TIME MEASUREMENT CALIBRATION SYSTEM, AND DISTANCE MEASURING SYSTEM
RADIO WAVE PROPAGATION TIME MEASUREMENT CALIBRATION METHOD, DISTANCE MEASURING METHOD, RADIO WAVE PROPAGATION TIME MEASUREMENT CALIBRATION SYSTEM, AND DISTANCE MEASURING SYSTEM
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机译：无线电波传播时间测量校准方法，距离测量方法，无线电波传播时间测量校准系统和距离测量系统
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摘要
PROBLEM TO BE SOLVED: To provide a radio wave propagation time measurement calibration technology and a distance measurement technology for accurately measuring the distance of a parent station and child station, using a simple configuration.;SOLUTION: A pair of pulses α are transmitted from a reader/writer 10 to an RFID tag 100, and pulse interval Tcal1 is measured. The RFID tag 100 measures pulse interval Tcal2 and transmits it to the reader/writer 10. The reader/writer 10 calibrates the radio wave propagation time measurement, based on the difference between Tcal1 and Tcal2. Then, a required pulse β is transmitted from the reader/writer 10 to the RFID tag 100. The RFID tag 100 transmits a response pulse γ with respect to the β and the period T2, since its receiving the β, until the transmission of the γ to the reader/writer 10. The reader/writer 10 measures the period T1, since transmitting the β until receiving the γ and calibrates the T2, and calculates the distance between the reader/writer 10 and the RFID tag 100, based on the difference between the calibrated T2 and T1.;COPYRIGHT: (C)2009,JPO&INPIT
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