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Estimation of Multi-Channel SAR Instrument Errors using a Hybrid Calibration System Model

Kroll, Jan Paul and Younis, Marwan and Krieger, Gerhard (2021) Estimation of Multi-Channel SAR Instrument Errors using a Hybrid Calibration System Model. In: Proceedings of the European Conference on Synthetic Aperture Radar, EUSAR. European Conference on Synthetic Aperture Radar (EUSAR), 2021-03-29 - 2021-04-01, Leipzig, Germany. ISSN 2197-4403.

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To fulfill the requirements for near future radar missions, using a space-borne Synthetic Aperture Radar (SAR), two main parameters are a high azimuth resolution and a wide swath. SAR instruments with multiple channels coupled with digital beam-forming techniques make it possible to achieve these goals. The high azimuth resolution is ensured by the Multiple Azimuth Channels (MACs) technique, while in elevation SCan-On-REceive (SCORE) is employed to improve the Signal-to-Noise Ratio (SNR) and suppress range ambiguities. It is imperative to know the differences between the channels and correct them by calibrating the system. In this paper we propose a hybrid calibration scheme consisting of an internal instrument calibration method and a data-based calibration method. For the internal calibration, a single tone calibration signal is sequentially coupled to the echo signal path. Frequency dependencies of the system can be accounted for by altering the frequency of the calibration signal. The coupling is done at Transmit Receive Module (TRM) level and the signal is evaluated in the Digital Beam-forming Unit (DBU). It allows for an uninterrupted transmit or receive operation while performing the calibration. The data-based calibration accounts for influences of the whole system, while the internal calibration only considers parts included in the loop, e.g. radiators are excluded. To estimate the errors in such a hybrid calibration system and aid in the system design a mathematical model and a simulation tool are developed. The tool also enables the estimation of residual errors in the system. We show results for the internal calibration where the calibration signal lies outside the SAR echo signal spectrum and where the frequency is sequentially altered. We then introduce an improved method for the internal calibration concept to estimate the current drift and predict values.

Item URL in elib:https://elib.dlr.de/134166/
Document Type:Conference or Workshop Item (Speech)
Title:Estimation of Multi-Channel SAR Instrument Errors using a Hybrid Calibration System Model
AuthorsInstitution or Email of AuthorsAuthor's ORCID iDORCID Put Code
Kroll, Jan PaulUNSPECIFIEDhttps://orcid.org/0000-0003-3131-2480UNSPECIFIED
Younis, MarwanUNSPECIFIEDhttps://orcid.org/0000-0002-8563-7371UNSPECIFIED
Krieger, GerhardUNSPECIFIEDhttps://orcid.org/0000-0002-4548-0285UNSPECIFIED
Date:April 2021
Journal or Publication Title:Proceedings of the European Conference on Synthetic Aperture Radar, EUSAR
Refereed publication:Yes
Open Access:No
Gold Open Access:No
In ISI Web of Science:No
Keywords:calibration, multi-channel calibration, hybrid SAR calibration, SAR instrument errors, instrument calibration simulator
Event Title:European Conference on Synthetic Aperture Radar (EUSAR)
Event Location:Leipzig, Germany
Event Type:international Conference
Event Dates:2021-03-29 - 2021-04-01
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 - Development of a mini-SAR
Location: Oberpfaffenhofen
Institutes and Institutions:Microwaves and Radar Institute > Radar Concepts
Deposited By: Kroll, Jan Paul
Deposited On:27 Feb 2020 16:33
Last Modified:05 Dec 2022 11:28

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