An Impulse Response Function for Evaluation of UWB SAR Imaging

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...

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Bibliographic Details
Published in:IEEE transactions on signal processing 2010-07, Vol.58 (7), p.3927-3932
Main Authors: Vu, Viet T, Sjogren, Thomas K, Pettersson, Mats I, Hellsten, Hans
Format: Article
Language:English
Subjects:
Antennas
Aperture antennas
Bandwidth
Fourier transforms
Image analysis
Imaging
Impulse response
Impulse response function in SAR imaging (IRF-SAR)
impulse response function in UWB SAR imaging (IRF-USAR)
Niobium
Radar antennas
Radar polarimetry
Signal analysis
Sinc
Synthetic aperture radar
synthetic aperture radar (SAR)
Two dimensional
Two dimensional displays
Ultra wideband antennas
ultrawideband-ultrawidebeam (UWB)
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Summary: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.
ISSN:1053-587X
1941-0476
1941-0476
DOI:10.1109/TSP.2010.2047503