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Signal model and linearization for nonlinear chirps in FMCW Radar SAW-ID tag request

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3 Author(s)
S. Scheiblhofer ; Inst. for Commun. & Inf. Eng, Johannes Kepler Univ., Linz, Austria ; S. Schuster ; A. Stelzer

In this paper, we present a frequency-modulated continuous-wave radar interrogation concept, based on direct digital synthesis (DDS), that operates without the commonly necessary high-frequency DDS reference oscillator. As the generated frequency sweeps are nonlinear, standard Fourier transform methods for baseband signal evaluation cannot be applied directly. We show the corresponding signal model, derive a linearization concept on the basis of resampling, and demonstrate the linearization algorithm on simulated data, as well as on real wireless interrogations of surface acoustic-wave sensors.

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IEEE Transactions on Microwave Theory and Techniques  (Volume:54 ,  Issue: 4 )