[射频]Identification of SAW ID-Tags Using an FSCW Interrogation Unit and Model-Based Evaluation

1412 ieee transactions on ultrasonics, ferroelectrics, and frequency control, vol. 51, no. 11, november 2004 20:F$d  
Identification of SAW ID-Tags Using an FSCW rfXxg^  
Interrogation Unit and Model-Based Fq9YhR  
Evaluation .[|UNg  
Andreas Stelzer, Member, IEEE, Markus Pichler, Student Member, IEEE, _)A|JC!jId  
Stefan Scheiblhofer, Student Member, IEEE, and Stefan Schuster, Student Member, IEEE *S$vSDJCW  
Abstract—Surface acoustic wave (SAW) devices are well X{9^$/XsJ  
suited for the application as wireless and completely passive @AyteHK  
identification (ID)-tag. They operate even under harsh hI[} -  
environmental conditions, especially under high temperatures. |,8z"g  
Interrogation units operate similar to conventional +v~xgUs  
radar systems and therefore, have the same resolution 7Ai?}%b-  
restrictions when an inverse fast Fourier transformation &|v)
 
(IFFT) is applied. The application of model-based algorithms uuzV,q  
to the evaluation of identification tags is presented +pofN-*%  
and enhancements in either improved resolution or reduced y^.66
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system bandwidth are shown. Furthermore, optimizations @d75X YKu  
in the coding scheme for reduced tag sizes are discussed, and
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