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Phase Pattern Calibration for Interferometric Applications in Spaceborne SAR Systems

Bachmann, Markus and Schwerdt, Marco and Castellanos Alfonzo, Gabriel and Schrank, Dirk (2013) Phase Pattern Calibration for Interferometric Applications in Spaceborne SAR Systems. International Journal of Antennas and Propagation (2013), pp. 1-8. Hindawi Publishing Corporation. DOI: 10.1155/2013/284698 ISSN 1687-5869

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Official URL: http://www.hindawi.com/journals/ijap/2013/284698/

Abstract

SAR is a widely used technique to acquire images for geoscience and earth observation applications. Active phased array antennas are commonly used in spaceborne SAR systems. For certain modes and applications, it is evident to know the phase behavior of these phased array antennas. For applications utilizing the different polarization channels for interferometry, the phase difference between the polarizations needs to be calibrated very accurately as it is the main evaluation parameter. Also for single pass interferometric missions, the difference between the two antennas in terms of phase gradients is of major importance. This paper demonstrates for the first time the usage of phase patterns in an operational interferometric SAR mission. It describes why these phase patterns are required and how they are used to fulfill the different goals of the missions. Then, the mathematical model to derive the phase of the antenna patterns is shown. Finally, the paper explains how the antenna patterns are calibrated in order to minimize their residual errors and describes in detail the measurements performed for this calibration and verification.

Item URL in elib:https://elib.dlr.de/85183/
Document Type:Article
Additional Information:© Hindawi Publishing Corporation
Title:Phase Pattern Calibration for Interferometric Applications in Spaceborne SAR Systems
Authors:
AuthorsInstitution or Email of AuthorsAuthors ORCID iD
Bachmann, MarkusUNSPECIFIEDUNSPECIFIED
Schwerdt, MarcoUNSPECIFIEDUNSPECIFIED
Castellanos Alfonzo, GabrielUNSPECIFIEDUNSPECIFIED
Schrank, DirkUNSPECIFIEDUNSPECIFIED
Date:6 November 2013
Journal or Publication Title:International Journal of Antennas and Propagation
Refereed publication:Yes
Open Access:Yes
Gold Open Access:Yes
In SCOPUS:Yes
In ISI Web of Science:Yes
DOI :10.1155/2013/284698
Page Range:pp. 1-8
Publisher:Hindawi Publishing Corporation
ISSN:1687-5869
Status:Published
Keywords:Phase Pattern, Antenna Calibration, Interferometry, TanDEM-X, Phased Array Antenna
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 - Projekt TanDEM-X
Location: Oberpfaffenhofen
Institutes and Institutions:Microwaves and Radar Institute
Microwaves and Radar Institute > Spaceborne SAR Systems
Deposited By: Bachmann, Markus
Deposited On:07 Nov 2013 16:33
Last Modified:08 Mar 2018 18:53

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