| 摘要 |
A method and a passive tag enable making a distance d detection of a radio telemetry unit, typically an RFID active tag or passive tag, without having the possibility to measure the incoming amplitude of power at the reader. The telemetry unit of a tag sends a sequence of steps together with its value of amplitude and data to be transmitted to the reader. The reader decodes the first understandable part of the sequence to determine the amplitude of the power required by the telemetry unit to be in range of the reader, and therefore can deduce a distance d.
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