Doppler aliasing reduction in SAR imagery using stepped-frequency waveforms

Author

Luminati, Jonathan ; Hale, T.B. ; Temple, Michael A. ; Havrilla, Michael J. ; Oxley, Mark E.

Volume

43

Issue

1

fYear

2007

fDate

1/1/2007 12:00:00 AM

Firstpage

163

Lastpage

175

Abstract

A new technique for eliminating Doppler aliasing artifacts in synthetic aperture radar (SAR) imagery is presented. The technique uses continuous transmission of stepped-frequency (SF) waveforms to generate a simple, but effective, approximation of a two-dimensional |sinc|²ambiguity function. This approach ensures aliasing artifacts are placed at nulls in a Doppler filter, effectively removing them from the imagery. Various methods of generating SF waveforms are introduced and their performance is quantified. Finally, simulated SAR imagery shows elimination of more than 99% of the aliased energy

Keywords

Doppler effect; approximation theory; synthetic aperture radar; 2D ambiguity function; Doppler aliasing artifacts; Doppler aliasing reduction; Doppler filter; SAR imagery; approximation; stepped-frequency waveforms; synthetic aperture radar imagery; Beam steering; Computer science; Filters; Government; Image resolution; Lighting; Protection; Radar polarimetry; Radar scattering; Synthetic aperture radar;

fLanguage

English

Journal_Title

Aerospace and Electronic Systems, IEEE Transactions on

Publisher

ieee

ISSN

0018-9251

Type

jour

DOI

10.1109/TAES.2007.357124

Filename

4194762