[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 GU>j8.  
Identification of SAW ID-Tags Using an FSCW sf2%WPK  
Interrogation Unit and Model-Based By@65KmR"  
Evaluation 3=n6NTL  
Andreas Stelzer, Member, IEEE, Markus Pichler, Student Member, IEEE, #3*cA!V.<  
Stefan Scheiblhofer, Student Member, IEEE, and Stefan Schuster, Student Member, IEEE 2!-Q!c`y  
Abstract—Surface acoustic wave (SAW) devices are well Kfb(wW  
suited for the application as wireless and completely passive AI3x,rk#  
identification (ID)-tag. They operate even under harsh fCUx93,>z  
environmental conditions, especially under high temperatures. FUL3@Gb$UV  
Interrogation units operate similar to conventional [;ZCq!)>  
radar systems and therefore, have the same resolution v K{2  
restrictions when an inverse fast Fourier transformation 4k^P1  
(IFFT) is applied. The application of model-based algorithms }Ecv6&G  
to the evaluation of identification tags is presented CjPdN#*l  
and enhancements in either improved resolution or reduced S~:uOm2t\  
system bandwidth are shown. Furthermore, optimizations zlEI_th:~  
in the coding scheme for reduced tag sizes are discussed, and
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