Determining speeds of radio frequency tags

G - Physics – 06 – K

Patent

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Details

G06K 7/00 (2006.01) G01S 13/58 (2006.01)

Patent

CA 2749148

The present disclosure is directed to determining speeds of radio frequency tags. In some implementations, a method includes sampling a Radio Frequency (RF) signal from an RFID tag at a plurality of different times as the RFID tag approaches an RFID reader and recedes from the RFID reader. A phase of the RF signal is determined for each of the plurality of different times based, at least in part, on the sampled RF signal. A speed of the RFID tag is determined based, at least in part, on the determined phase for the sampled signal for each of the plurality of different times.

La présente invention concerne la détermination des vitesses d'étiquettes d'identification par radiofréquence (RFID). Dans certaines mises en uvre, un procédé consiste à échantillonner un signal radiofréquence (RF) d'une étiquette RFID à une pluralité de moments différents au fur et à mesure que l'étiquette RFID s'approche d'un lecteur RFID et s'éloigne de celui-ci. Une phase du signal RF est déterminée pour chaque moment de la pluralité de moments différents sur la base, au moins en partie, du signal RF échantillonné. Une vitesse de l'étiquette RFID est déterminée sur la base, au moins en partie, de la phase déterminée pour le signal échantillonné pour chaque moment de la pluralité de moments différents.

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