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

Author

Scheiblhofer, Stefan ; Schuster, Stefan ; Stelzer, Andreas

Author_Institution

Inst. for Commun. & Inf. Eng, Johannes Kepler Univ., Linz, Austria

Volume

54

Issue

4

fYear

2006

fDate

6/1/2006 12:00:00 AM

Firstpage

1477

Lastpage

1483

Abstract

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.

Keywords

CW radar; FM radar; direct digital synthesis; linearisation techniques; radar signal processing; signal sampling; surface acoustic wave sensors; DDS; FMCW radar; Fourier transform methods; SAW-ID tag request; direct digital synthesis; frequency-modulated continuous-wave radar interrogation; linearization algorithm; linearization techniques; nonlinear chirps; signal model; surface acoustic-wave sensors; wireless interrogations; Acoustic sensors; Baseband; Chirp; Fourier transforms; Frequency synthesizers; Oscillators; Radar; Signal generators; Signal synthesis; Wireless sensor networks; Direct digital synthesis (DDS); frequency-modulated continuous wave (FMCW) radar; linearization; nonlinear chirp;

fLanguage

English

Journal_Title

Microwave Theory and Techniques, IEEE Transactions on

Publisher

ieee

ISSN

0018-9480

Type

jour

DOI

10.1109/TMTT.2006.871361

Filename

1618566