Surface acoustic wave radio frequency identification tag with large coding capacity and function of automatic error correction and error correction method thereof

Abstract

The invention relates to a surface acoustic wave radio frequency identification tag with large coding capacity and a function of automatic error correction and an error correction method thereof. The identification tag and an identification tag reader form a surface acoustic wave radio frequency identification tag system. The identification tag comprises a piezoelectric substrate, an interdigital transducer and various reflecting gratings. The interdigital transducer and reference reflecting gratings are arranged at one end of the piezoelectric substrate, the length of the piezoelectric substrate is fictitiously divided into a plurality of slot positions with even distance, the reflecting gratings are arranged in the slot positions and respectively belong to a data area and an error correction check area, the reference reflecting gratings and the various reflecting gratings are sequentially arranged, each information carried by the identification tag of the data area is one to one corresponding to information of relative distance between every two adjacent reflecting gratings, and the identification tag of the error correction check area are arranged according to the position of the identification tag of the data area and certain rules. The surface acoustic wave radio frequency identification tag with the large coding capacity and the function of the automatic error correction has functions of automatic error detection and automatic error correction and is high in reliability.

Description

technical field [0001] The invention relates to a device and method in the field of radio frequency identification, in particular to a surface acoustic wave radio frequency tag with large coding capacity and an error correction method with automatic error correction. Background technique [0002] Radio Frequency Identification (RFID, Radio Frequency Identification) technology is a technology that applies non-contact tags, which automatically identify target objects and obtain relevant data through radio frequency signals. It is an important practical technology to adapt to the development of information technology and information society. It is used in intelligent management in many fields such as automatic toll collection of expressways, logistics management, automatic parcel sorting of postal aviation, storage and book management, animal husbandry monitoring and management, and vehicle anti-theft. It has great application prospects. In order to achieve a single tag number...

AI Technical Summary

Problems solved by technology

The encoding capacity of conventional on-off keying encoding (OOK, On-Off Keying), pulse position (PPM, Pulse Position Modulation) or phase encoding (PSK, Phase Shift Keying) etc. is relatively small

Especially in the case of limited wireless query signal bandwidth, even if the large-capacity coding method proposed by the patent CN1615490A is adopted, it is difficult to design a coding capacity of more than one million and an error-correctable number of 2 more than one surface acoustic wave radio frequency tag

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