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Constraints for the Performance of Large-Deployable Reflectors based on Surface Deformations simulated for Tandem-L

Klenk, Patrick and Reimann, Jens and Schwerdt, Marco (2018) Constraints for the Performance of Large-Deployable Reflectors based on Surface Deformations simulated for Tandem-L. In: CEOS SAR WORKSHOP. CEOS SAR Workshop on Calibration and Validation (CEOS SAR CalVal), 2018-12-05 - 2018-12-07, Buenos Aires, Argentina.

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Abstract

Based upon the needs of the scientific community, the next generation of earth observation radar satellites will focus on comparatively longer wavelengths such as L- or even P-band. Due to operational constraints, instruments currently under development will likely be constructed as a phased antenna feed array paired with a large deployable reflector (LDR) / boom assembly. Compared to traditional planar array based instrument designs, this leads to a series of novel challenges which have to be addressed. Serving a plethora of different scientific applications, LDR based missions such as Tandem-L have been designed to carry a highly versatile instrument which results in rather stringent requirements on the instrument performance, especially in terms of pointing performance and phase stability. One major concern is the necessary performance such LDR/boom assemblies in terms of tolerable thermo-elastic deformations of the reflector mesh and mechanical pointing stability, especially in conjunction with the state-of-the art digital beamforming methods which are to be employed on-board. Hence, using the S/C and instrument geometry currently foreseen for the Tandem-L mission, in this presentation we specifically analyze and discuss the impact of both expected intra-orbit thermo-elastic deformations (TED) and a series of shifted and tilted LDR configurations on simulated far-field antenna patterns before and after digital beamforming. Based upon this analysis, we derive constraints for the necessary operational performance of such an LDR-boom assembly in terms of acceptable limits on the resulting variation in antenna gain and phase as well as pointing stability. Finally, this analysis is extended to a shaped, no longer fully paraboloid version of the LDR. Such a shape has been proposed to improve the Tandem-L performance in the case of a potential Transmit-Receive-Module failure.

Item URL in elib:https://elib.dlr.de/122031/
Document Type:Conference or Workshop Item (Speech)
Title:Constraints for the Performance of Large-Deployable Reflectors based on Surface Deformations simulated for Tandem-L
Authors:
AuthorsInstitution or Email of AuthorsAuthors ORCID iD
Klenk, PatrickPatrick.Klenk (at) dlr.deUNSPECIFIED
Reimann, Jensjens.reimann (at) dlr.dehttps://orcid.org/0000-0002-0650-9073
Schwerdt, MarcoMarco.Schwerdt (at) dlr.dehttps://orcid.org/0000-0002-0045-3726
Date:5 December 2018
Journal or Publication Title:CEOS SAR WORKSHOP
Refereed publication:Yes
Open Access:No
Gold Open Access:No
In SCOPUS:No
In ISI Web of Science:Yes
Status:Published
Keywords:SAR, Calibration of Future SAR Missions, Tandem-L, Large-Deployable Reflector, LDR, Simulation, GRASP, electromagnetic simulations, digital-beam forming, DBF, MVDR, antenna pointing
Event Title:CEOS SAR Workshop on Calibration and Validation (CEOS SAR CalVal)
Event Location:Buenos Aires, Argentina
Event Type:international Conference
Event Dates:2018-12-05 - 2018-12-07
Organizer:CEOS-WGCV
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 - Vorhaben Tandem-L Vorstudien
Location: Oberpfaffenhofen
Institutes and Institutions:Microwaves and Radar Institute > Spaceborne SAR Systems
Deposited By: Klenk, Dr. Patrick
Deposited On:08 Oct 2018 09:41
Last Modified:23 Jan 2019 10:41

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