Echo frequency discrimination method for passive radio frequency identification temperature measurement system

Abstract

The invention relates to an echo frequency discrimination method for a passive radio frequency identification temperature measurement system. The method comprises the following steps of 1, dividing different frequency points for a frequency band of starting frequency, setting different frequency point numbers for the different frequency points, setting the starting frequency, and performing step-scan within a frequency range; 2, acquiring a group of power sampling signals and a group of frequency sampling signals; 3, performing time-domain judgment-based time-domain energy validation for five times for characteristics of a unique medium of a radio frequency identification tag; 4, converting a time-domain signal into a frequency-domain signal, and performing frequency-domain validation twice; and 5, obtaining a final result by combining the time-domain validation and the frequency-domain validation. According to the method, acquired echo frequency is subjected to strict multi-stage time-domain and frequency-domain judgment, a combined multi-stage frequency addition mode is adopted, and correct echo frequency is obtained by hybrid time-domain and frequency-domain discrimination and multi-stage condition judgment, so that air interference factors existing all the time in a radio frequency identification technology are better avoided, accurate and high-quality echo frequency can be effectively acquired, and the reading distance of a passive tag is greatly prolonged.

Description

technical field [0001] The invention belongs to Radio Frequency IDentification (RFID) technology, also known as electronic label and radio frequency identification communication technology field, in particular to an echo frequency screening method in a passive RFID temperature measurement system. Background technique [0002] RFID radio frequency identification is a non-contact automatic identification technology. It does not need to establish mechanical or optical contact between the identification system and specific targets. It automatically identifies specific targets and obtains relevant data through radio frequency signals. The identification work does not require manual intervention. RF signals can penetrate snow, fog, ice, paint, and dirt, thus enabling the system to work in various harsh environments. RFID technology can identify high-speed moving objects and can identify multiple tags at the same time, and the operation is fast and convenient. [0003] The basic w...

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Problems solved by technology

[0006] However, there are always air interference factors in RFID technology. Various interference factors in the air often interfere with the identification of tags after entering the magnetic field, especially for long-distance weak signal identification, which seriously affects the application range and effect of RFID technology.

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