An Impulse Response Function for Evaluation of UWB SAR Imaging

Document type: Journal Articles
Article type: Original article
Peer reviewed: Yes
Full text:
Author(s): Viet Thuy Vu, Thomas Sjögren, Mats Pettersson, Hans Hellsten
Title: An Impulse Response Function for Evaluation of UWB SAR Imaging
Journal: IEEE Transactions on Signal Processing
Year: 2010
Volume: 58
Issue: 7
Pagination: 3927-3932
ISSN: 1053-587X
Publisher: IEEE
URI/DOI: 10.1109/TSP.2010.2047503
ISI number: 000278813600046
Organization: Blekinge Institute of Technology
Department: School of Engineering - Dept. of Electrical Engineering (Sektionen för ingenjörsvetenskap - Avd. för elektroteknik)
School of Engineering S-371 79 Karlskrona
+46 455 38 50 00
Authors e-mail:,,,
Language: English
Abstract: Based on analysis of a point target imaged by different synthetic aperture radar (SAR) systems, the commonly used impulse response function in SAR Imaging (IRF-SAR)—a two-dimensional (2-D) sinc function—is shown to be inappropriate for ultrawideband-ultrawidebeam (UWB) SAR systems utilizing a large fractional signal bandwidth and a wide antenna beamwidth. As a consequence, the applications of the 2-D sinc function such as image quality measurements and spatial resolution estimations are limited to narrowband-narrowbeam (NB) SAR systems exploiting a small fractional signal bandwidth and a narrow antenna beamwidth. In this paper, a more general IRF-SAR, which aims at UWB SAR systems, is derived with an assumption of flat two-dimensional (2-D) Fourier transform (FT) of a SAR image and called IRF-USAR. However, the derived IRF-USAR is also valid for NB SAR systems.
Subject: Signal Processing\Radar and Sonar
Signal Processing\General
Keywords: Impulse response function in SAR imaging (IRF-SAR), impulse response function in UWB SAR imaging (IRF-USAR), synthetic aperture radar (SAR), Sinc, ultrawideband-ultrawidebeam (UWB).