Prats, Pau and Rodriguez-Cassola, Marc and De Zan, Francesco and Lopez-Dekker, Paco and Scheiber, Rolf and Reigber, Andreas (2014) Efficient Evaluation of Fourier-Based SAR Focusing Kernels. IEEE Geoscience and Remote Sensing Letters, 11 (9), pp. 1489-1493. IEEE - Institute of Electrical and Electronics Engineers. doi: 10.1109/LGRS.2013.2296371. ISSN 1545-598X.
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Abstract
This letter addresses the efficient evaluation of Fourier-based kernels for synthetic aperture radar (SAR) image formation. The goal is to evaluate the quality of the focused impulse response function and the residual phase errors of the kernel without having to implement the processor itself nor perform a costly point-target simulation followed by the processing. The proposed methodology is convenient for situations where the assumption of a hyperbolic range history does not hold anymore, and hence, a compact analytic expression of the point target spectrum is not available. Examples where the hyperbolic range history does not apply include very high resolution spaceborne SAR imaging or bistatic SAR imaging. The approach first numerically computes the 2-D spectrum of a point target and then uses the transfer function of the focusing kernel to match it. The spectral support is then computed to adapt the spectrum to the output imaging geometry, so that the impulse response function (IRF) is finally obtained. The proposed approach is valid under the assumption of a large time-bandwidth product, as is usually the case for current air- and spaceborne SAR sensors. The methodology is validated by comparing the matched IRFs with the ones obtained using point-target simulations.
Item URL in elib: | https://elib.dlr.de/86910/ | ||||||||||||||||||||||||||||
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Document Type: | Article | ||||||||||||||||||||||||||||
Additional Information: | ©2014 IEEE. Personal use of this material is permitted. However, permission to reprint/republish this material for advertising or promotional purposes or for creating new collective works for resale or redistribution to servers or lists, or to reuse any copyrighted component of this work in other works must be obtained from the IEEE | ||||||||||||||||||||||||||||
Title: | Efficient Evaluation of Fourier-Based SAR Focusing Kernels | ||||||||||||||||||||||||||||
Authors: |
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Date: | September 2014 | ||||||||||||||||||||||||||||
Journal or Publication Title: | IEEE Geoscience and Remote Sensing Letters | ||||||||||||||||||||||||||||
Refereed publication: | Yes | ||||||||||||||||||||||||||||
Open Access: | Yes | ||||||||||||||||||||||||||||
Gold Open Access: | No | ||||||||||||||||||||||||||||
In SCOPUS: | Yes | ||||||||||||||||||||||||||||
In ISI Web of Science: | Yes | ||||||||||||||||||||||||||||
Volume: | 11 | ||||||||||||||||||||||||||||
DOI: | 10.1109/LGRS.2013.2296371 | ||||||||||||||||||||||||||||
Page Range: | pp. 1489-1493 | ||||||||||||||||||||||||||||
Publisher: | IEEE - Institute of Electrical and Electronics Engineers | ||||||||||||||||||||||||||||
ISSN: | 1545-598X | ||||||||||||||||||||||||||||
Status: | Published | ||||||||||||||||||||||||||||
Keywords: | SAR processing, SAR simulation, SAR spectrum, spotlight SAR, synthetic aperture radar (SAR) | ||||||||||||||||||||||||||||
HGF - Research field: | Aeronautics, Space and Transport | ||||||||||||||||||||||||||||
HGF - Program: | Space | ||||||||||||||||||||||||||||
HGF - Program Themes: | Earth Observation | ||||||||||||||||||||||||||||
DLR - Research area: | Raumfahrt | ||||||||||||||||||||||||||||
DLR - Program: | R EO - Earth Observation | ||||||||||||||||||||||||||||
DLR - Research theme (Project): | R - Aircraft SAR | ||||||||||||||||||||||||||||
Location: | Oberpfaffenhofen | ||||||||||||||||||||||||||||
Institutes and Institutions: | Microwaves and Radar Institute Microwaves and Radar Institute > Radar Concepts Microwaves and Radar Institute > SAR Technology | ||||||||||||||||||||||||||||
Deposited By: | Prats, Dr. Pau | ||||||||||||||||||||||||||||
Deposited On: | 18 Dec 2013 10:09 | ||||||||||||||||||||||||||||
Last Modified: | 31 Jul 2019 19:44 |
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