RELAX-based autofocus algorithm for high-resolution strip-map SAR
Paper i proceeding, 2009

This paper addresses the non-iterative quality phase gradient autofocus (QPGA) technique which was originally proposed to remove one-dimensional phase errors in spotlight-mode synthetic aperture radar (SAR) imagery. By enriching the source pool, the method is modified in a way suitable for autofocus in stripmap-mode SAR system with the advantage of being independent of any priori assumptions. Unlike the QPGA the potential candidates, i.e., dominant scatterers located along azimuth in each specific range bin, are automatically selected by exploiting the one-dimensional RELAX algorithm. Furthermore, RELAX is capable of estimating the size of blur window which is, in fact, associated with the Doppler spread of signal spectrum. The corresponding model includes four parameters i.e., complex amplitude, delay, Doppler center and spectral width. The proposed method has been applied to data extracted by a ground-based rotating coherent Doppler radar operating in strip-mapping mode SAR, with the aim of high-resolution clutter detection.

Författare

Hirad Ghaemi

Chalmers, Signaler och system

Mats Viberg

Signaler och system, Signalbehandling och medicinsk teknik, Signalbehandling

M. Galletti

Deutsches Zentrum fur Luft- Und Raumfahrt

T. Boerner

Deutsches Zentrum fur Luft- Und Raumfahrt

F. Gekat

SELEX Sistemi integrati

IEEE National Radar Conference - Proceedings

10975659 (ISSN)

1 - 6 4977141

Ämneskategorier

Rymd- och flygteknik

Signalbehandling

Annan elektroteknik och elektronik

DOI

10.1109/RADAR.2009.4977141

ISBN

978-142442871-7