CN103902945A - Method for increasing identification rate of RFID label by adopting frequency-hopping scanning - Google Patents

Abstract

A method for increasing the identification rate of an RFID label by adopting frequency-hopping scanning comprises the following steps that (1) an RFID label reader-writer sends reading signals to the RFID label at a fixed frequency, and a signal is fed back by the RFID label to be identified by the RFID label reader-writer; (2) when the signal fed back in the step (1) is too weak and cannot be identified by the RFID label reader-writer, the RFID label reader-writer sends reading signals to the RFID label through frequency-hopping continuous scanning, continuous signals are fed back by the RFID label to be identified by the RFID label reader-writer, the continuous signals have obvious signal differences, and the RFID label reader-writer captures tiny signals by continuously comparing change values of the signals received twice before and after so as to read label data. Through changes of the label signals fed back by the label twice before and after, reading sensitivity of the label is enhanced, and the identification rate of the RFID label is increased.

Description

Adopt frequency hopping scanning to improve the method for RFID tag recognition rate

Technical field

The present invention relates to a kind of RFID(radio-frequency (RF) identification) method of tag recognition, be specifically related to a kind of method that adopts frequency hopping scanning to improve RFID tag recognition rate.

Background technology

Internet of Things (Internet of things) is the important trend of current information networking development, is called as computing machine, the internet third wave of world's information industry afterwards, and radio RF recognition technology RFID is one of gateway of internet of things key technology.RFID technology is a kind of contactless automatic identification technology, it is automatically identified destination object and is obtained related data by radiofrequency signal, with its identification can radio read-write, strong, the distance of signal penetration capacity, long service life, good environmental adaptability, can many labels identify simultaneously, information storage easily greatly and data the advantage such as can rewrite, be used widely in recent years.

When existing RFID label read-write, conventionally be all first to carry out anticollision to repay examination, then each read write line accounts for a frequency and carries out the read-write of RFID label, and tag feedback is returned a signal for read write line demodulation identification, and this mode is because the label signal feeding back is stationary singnal, there is an actual requirement for the directivity of label and antenna, at some special occasions, for this stationary singnal, if when signal is fainter, read write line is difficult to receive, and label is None-identified likely.

Summary of the invention

The object of the invention is the discrimination for improving RFID label.

For achieving the above object, the present invention is by the following technical solutions:

A kind of method that adopts frequency hopping scanning to improve RFID tag recognition rate is provided, it is characterized in that, comprise the following steps:

(1) RFID tag read-write equipment is by fixed frequency to RFID label transmitting read signal, and signal of RFID tag feedback is for the identification of RFID tag read-write equipment;

(2) when feedback signal described in step (1) is compared with weak and can not be identified by RFID tag read-write equipment time, RFID tag read-write equipment is launched read signal by frequency hopping continuous sweep to RFID label, RFID tag feedback continuous signal is for the identification of RFID tag read-write equipment, between these continuous signals, have obvious signal difference, RFID tag read-write equipment catches tiny signal with reading tag data by the changing value that receives signal before and after continuous contrast for twice.

The present invention is in the case of fixing the weak None-identified RFID label of stationary singnal of frequency due to feedback, RFID tag read-write equipment is by taking the mode of continuous frequency hopping scanning to RFID label transmitting read signal, the change amount of twice label signal in front and back of returning by this tag feedback, realize the enhancing of label being read to sensitivity, thereby improve the discrimination of RFID label.

Embodiment

RFID tag read-write equipment, in the time reading RFID label, first carries out reading of label by the selected fixing frequency of normal condition, can realize most labels and read; If still there is the label that cannot read, can adopt the mode of frequency hopping scanning, launch read signal by continuous sweep, can obtain the continuous feedback signal of label, between these continuous feedback signals, can produce obvious signal difference, by receiving the difference of signal before and after continuous contrast for twice, read write line can catch very tiny signal, and can realize reading of label data by these signals, thereby improve the success ratio that label reads.

Claims (1)

1. adopt frequency hopping scanning to improve a method for RFID tag recognition rate, it is characterized in that, comprise the following steps:

(1) RFID tag read-write equipment is by fixed frequency to RFID label transmitting read signal, and signal of RFID tag feedback is for the identification of RFID tag read-write equipment;

(2) when feedback signal described in step (1) is compared with weak and can not be identified by RFID tag read-write equipment time, RFID tag read-write equipment is launched read signal by frequency hopping continuous sweep to RFID label, RFID tag feedback continuous signal is for the identification of RFID tag read-write equipment, between these continuous signals, have obvious signal difference, RFID tag read-write equipment catches tiny signal with reading tag data by the changing value that receives signal before and after continuous contrast for twice.