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Geometric Accuracy of Sentinel-1A and 1B derived from SAR Raw Data with GPS surveyed Corner Reflector Positions

Schmidt, Kersten and Reimann, Jens and Tous Ramon, Núria and Schwerdt, Marco (2018) Geometric Accuracy of Sentinel-1A and 1B derived from SAR Raw Data with GPS surveyed Corner Reflector Positions. Remote Sensing, 10 (4). Multidisciplinary Digital Publishing Institute (MDPI). DOI: 10.3390/rs10040523 ISSN 2072-4292

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Official URL: http://www.mdpi.com/2072-4292/10/4/523

Abstract

The geometric accuracy of synthetic aperture radar (SAR) data is usually derived from level-1 products using accurately surveyed corner reflector positions. This paper introduces a novel approach that derives the range delay and azimuth shift from acquired SAR raw data (level-0 products). Therefore, the propagation path is completely retrieved from SAR pulse transmission up to the reception of the point target's backscatter. The procedure includes simple pulse compression in range and azimuth instead of full SAR data processing. By applying this method, the geometric accuracy of ESA's Sentinel-1 SAR satellites (Sentinel-1A and Sentinel-1B) is derived for each satellite overpass by using corner reflectors with precisely surveyed GPS positions. The results show that the azimuth bias of about 2 m found in level-1 products for Stripmap acquisitions is reduced to about 15 cm. This indicates an artificial bias arising from operational Sentinel-1 SAR data processing. The remaining range bias of about 1.0 m, observed in L0-products, is interpreted as the offset between the SAR antenna phase center and the spacecraft's center of gravity. The relative pixel localization accuracy derived with the proposed method is about 12 cm for the evaluated acquisitions. Compared to the full processed level-1 SAR data products, this accuracy is similar in the range direction, but, for the azimuth direction, it is improved by about 50% with the proposed method.

Item URL in elib:https://elib.dlr.de/117899/
Document Type:Article
Title:Geometric Accuracy of Sentinel-1A and 1B derived from SAR Raw Data with GPS surveyed Corner Reflector Positions
Authors:
AuthorsInstitution or Email of AuthorsAuthors ORCID iD
Schmidt, KerstenKersten.Schmidt (at) dlr.dehttps://orcid.org/0000-0001-7896-908X
Reimann, Jensjens.reimann (at) dlr.dehttps://orcid.org/0000-0002-0650-9073
Tous Ramon, NúriaNuria.TousRamon (at) dlr.dehttps://orcid.org/0000-0002-0450-0438
Schwerdt, MarcoMarco.Schwerdt (at) dlr.dehttps://orcid.org/0000-0002-0045-3726
Date:27 March 2018
Journal or Publication Title:Remote Sensing
Refereed publication:Yes
Open Access:Yes
Gold Open Access:Yes
In SCOPUS:Yes
In ISI Web of Science:Yes
Volume:10
DOI :10.3390/rs10040523
Publisher:Multidisciplinary Digital Publishing Institute (MDPI)
ISSN:2072-4292
Status:Published
Keywords:Synthetic aperture radar; Sentinel-1; geometric accuracy; point target evaluation
HGF - Research field:Aeronautics, Space and Transport
HGF - Program:Space
HGF - Program Themes:Earth Observation
DLR - Research area:Raumfahrt
DLR - Program:R EO - Erdbeobachtung
DLR - Research theme (Project):R - SAR-Missions
Location: Oberpfaffenhofen
Institutes and Institutions:Microwaves and Radar Institute > Spaceborne SAR Systems
Deposited By: Schmidt, Dr. Kersten
Deposited On:08 Jan 2018 12:09
Last Modified:19 Dec 2018 11:37

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