[射频]Signal Model and Linearization for Nonlinear Chirps in FMCW Radar SAW-ID Tag Request

IEEE TRANSACTIONS ON MICROWAVE THEORY AND TECHNIQUES, VOL. 54, NO. 4, APRIL 2006 1477 _ygdv\^Tet  
Signal Model and Linearization for Nonlinear Chirps lL&p?MUp  
in FMCW Radar SAW-ID Tag Request x\pygzQ/  
Stefan Scheiblhofer, Student Member, IEEE, Stefan Schuster, Student Member, IEEE, and ,{d=<j_  
Andreas Stelzer, Member, IEEE G%U!$\j:qd  
Abstract—In this paper, we present a frequency-modulated /w2N
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continuous-wave radar interrogation concept, based on direct (zw.?ADPCT  
digital synthesis (DDS), that operates without the commonly U04)XfO;]  
necessary high-frequency DDS reference oscillator. As the generated p1s|JI  
frequency sweeps are nonlinear, standard Fourier transform cd] X5)$h  
methods for baseband signal evaluation cannot be applied directly. 0aGAF ]  
We show the corresponding signal model, derive a linearization U["IXR#  
concept on the basis of resampling, and demonstrate the linearization ([]\7}+8  
algorithm on simulated data, as well as on real wireless 3iw.yR  
interrogations of surface acoustic-wave sensors. 06I(01M1  
Index Terms—Direct digi .. gF\ac%9  
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