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Accommodation of space-variant effects in spaceborne SAR image formation

Prats, Pau and Rodríguez-Cassolà, Marc and Scheiber, Rolf and Reigber, Andreas (2014) Accommodation of space-variant effects in spaceborne SAR image formation. In: Proceedings of the IEEE International Geoscience and Remote Sensing Symposium (IGARSS), pp. 938-941. IEEE. IEEE International Geoscience and Remote Sensing Symposium (IGARSS), 2012-07-14 - 2012-07-18, Québec, Canada. doi: 10.1109/igarss.2014.6946580.

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Official URL: http://www.igarss2014.org/


The spaceborne SAR geometry is space-variant due to the curved orbit and Earth's rotation. A first space-variant effect is the azimuth variance, which in current missions is accommodated by processing the data in azimuth blocks larger than the synthetic aperture and updating the processing parameters of the kernel. However, such option is not valid when the variation occurs within the observation time, as it happens in high resolution modes. A second space-variant effect occurs due to the topography dependence of the geometry, i.e., targets at the same zero-Doppler slant-range distance but different altitudes have slightly different range curvatures. This topography-dependence is currently neglected in civilian SAR missions. However, it has been recently shown that in very high resolution spaceborne SAR image formation (e.g., resolutions a factor 10 of the wavelength or smaller) the azimuth- and topography-dependence become critical. This paper analyses first these two effects and then proposes a processing scheme to efficiently handle the geometry. The proposed approach is validated with simulations and TSX staring spotlight data.

Item URL in elib:https://elib.dlr.de/89273/
Document Type:Conference or Workshop Item (Speech)
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:Accommodation of space-variant effects in spaceborne SAR image formation
AuthorsInstitution or Email of AuthorsAuthor's ORCID iDORCID Put Code
Date:15 July 2014
Journal or Publication Title:Proceedings of the IEEE International Geoscience and Remote Sensing Symposium (IGARSS)
Refereed publication:Yes
Open Access:No
Gold Open Access:No
In ISI Web of Science:No
Page Range:pp. 938-941
Keywords:Synthetic aperture radar (SAR), Spotlight, SAR processing
Event Title:IEEE International Geoscience and Remote Sensing Symposium (IGARSS)
Event Location:Québec, Canada
Event Type:international Conference
Event Dates:2012-07-14 - 2012-07-18
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 > SAR Technology
Deposited By: Prats, Dr. Pau
Deposited On:27 May 2014 13:40
Last Modified:24 Jul 2023 11:18

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