[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 Fx1FxwIJ  
Identification of SAW ID-Tags Using an FSCW hRB
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Interrogation Unit and Model-Based (5:pHX`P  
Evaluation >y#qn9rV1  
Andreas Stelzer, Member, IEEE, Markus Pichler, Student Member, IEEE, z"QtP[_m  
Stefan Scheiblhofer, Student Member, IEEE, and Stefan Schuster, Student Member, IEEE =\5f_g2M  
Abstract—Surface acoustic wave (SAW) devices are well
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suited for the application as wireless and completely passive |-*50j l  
identification (ID)-tag. They operate even under harsh ndN*X'  
environmental conditions, especially under high temperatures. Hc|cA(9sh9  
Interrogation units operate similar to conventional %B1TN#KoT  
radar systems and therefore, have the same resolution u+6D|  
restrictions when an inverse fast Fourier transformation aTH$+f1?Q  
(IFFT) is applied. The application of model-based algorithms ;[P>  
to the evaluation of identification tags is presented 5f0g7w =-  
and enhancements in either improved resolution or reduced 74 )G.!  
system bandwidth are shown. Furthermore, optimizations aEa+?6;D  
in the coding scheme for reduced tag sizes are discussed, and
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