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Communication processing apparatus and distance measuring method for communication processing apparatus

  • US 8,717,227 B2
  • Filed: 11/16/2011
  • Issued: 05/06/2014
  • Est. Priority Date: 03/04/2011
  • Status: Active Grant
First Claim
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1. A communication processing apparatus that processes and transmits a command to an RFID tag by modulating a carrier wave, receives and processes a reflected wave from the RFID tag in response to an unmodulated carrier wave while transmitting the unmodulated carrier wave, and decodes and processes a response signal of the RFID tag from the received reflected wave, the apparatus comprising:

  • a phase detector that detects a phase of the reflected wave received in the reception processing;

    a phase changer that changes a phase of the unmodulated carrier wave in response to a start of reception of the reflected wave in the reception processing; and

    a distance measurer that measures a time from when the phase of the unmodulated carrier wave is changed to a time when a corresponding change occurs in the phase of the reflected wave detected by the phase detector, and that uses the measured time to measure a distance to the RFID tag that returned the reflected wave.

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