Precision determining method for surface acoustic wave radio frequency label echo time delay

A technology of echo time delay and radio frequency tags, which is applied in the direction of sound wave re-radiation, re-radiation, radio wave measurement system, etc., can solve the specific implementation method of delay determination, non-uniqueness of delay integer value, Different code capacity reduction and other issues

Inactive Publication Date: 2009-03-18
水永安
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Problems solved by technology

(2) No specific implementation method for delay determination is proposed
If the parameter is too large, the different code capacity of the same system will be greatly reduced, reduci

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  • Precision determining method for surface acoustic wave radio frequency label echo time delay
  • Precision determining method for surface acoustic wave radio frequency label echo time delay
  • Precision determining method for surface acoustic wave radio frequency label echo time delay

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Embodiment Construction

[0023] like figure 1 As shown, at an unknown T°C, the reader 10 sends out the query signal 20 to obtain the response 30 of the surface acoustic wave radio frequency tag 40, and zero-fills frequencies outside the signal frequency band to improve the time domain resolution. Then do inverse Fourier transform to get the signal in time domain. Add a time-domain window to segment each echo pulse, and then perform Fourier transform on each segmented echo pulse to obtain the phase of each pulse at the corresponding center frequency, and obtain the phase difference between each pulse phase and the reference pulse and each encoding pulse The group delay of the signal. Utilize the fixed time delay between the reference pulses 101, 102, 103 of the reflective grating at the known position as a comparison standard, the time delay is at the standard temperature T 0 The value below is given in advance, set to n 0 (T 0 ). When measuring, first use the time delay n as a standard 0 (T) (f...

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Abstract

Disclosed is an accurate confirming method of the back wave time delay of an acoustic surface wave radio-frequency tag, the steps of the method comprise setting a parameter delta n, limiting the possible time delay of each reflected pulse under the standard temperature, only permitting the possible time delay to exist in a series of extremely small range of delay time decided by the delta n, auxiliary confirming the integer number of the carrier cycle in pulse time delay by measuring group time delay, enabling the uncertainty of the integer part of the back wave phase time delay to be limited in a certain range, and utilizing the incidence relation of a preset permission time delay range and a back wave phase in the range to confirm the integer part of the time delay in the certain range, thereby accurately obtaining the back wave time delay. When measuring the back wave time delay under an unknown temperature, the designed time delay under the standard temperature can be obtained after measuring a temperature time delay coefficient through the phase difference of 1-2 reflecting grating intervals of the known time delay under the standard temperature. Under the condition of meeting the reliability of the system, the method of the invention can be utilized to design the largest different code quantity on the acoustic surface wave radio-frequency tag of which the substrate length is limited.

Description

Technical field: [0001] This patent relates to coded surface acoustic wave (SAW) radio frequency tag technology, specifically, to a method for accurately determining echo time delay by using carrier phase information combined with group delay measurement, including necessary Temperature compensation. technical background: [0002] In the 1990s, there was an upsurge in research and development and use of radio frequency tags (RFID) in scientific research institutions and business circles. Surface acoustic wave (SAW) radio frequency tags belong to one of the classifications of radio frequency identification technology, and are a new type of non-contact automatic identification technology that is different from IC chip identification, passive and chipless. It is a new achievement of the system applying modern electronics, acoustics, semiconductor plane technology, radar and signal processing technology. The main features of the radio frequency tag realized by SAW technology a...

Claims

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Application Information

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IPC IPC(8): G06K7/00G01S15/02
Inventor 水永安韩韬
Owner 水永安
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