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Instrument Error Model for Internal Calibration

Kroll, Jan Paul and Younis, Marwan and Krieger, Gerhard (2020) Instrument Error Model for Internal Calibration. In: 2020 German Microwave Conference (GeMiC 2020), pp. 196-199. German Microwave Conference (GeMiC), 2020-03-09 - 2020-03-11, Cottbus-Senftenberg, Germany. ISBN 978-3-9820-3971-8. ISSN 2167-8022.

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Abstract

Two key requirements for a modern space-borne Synthetic Aperture Radar (SAR) are a high azimuth resolution and a wide swath. This can be achieved by using SAR instruments with multiple digital channels. Differences between the channels lead to a reduced performance due to the degraded antenna pattern. To account for that the system has to be calibrated. In this paper we focus on the internal instrument calibration. The internal calibration concept suggested here allows for a simultaneous calibration during SAR transmit and receive operation. For the receive calibration, a single tone calibration signal, the CalTone, is sequentially coupled to the echo signal path. The transmit calibration is done by first characterizing the receiver (Radio Frequency Unit (RFU) and Digital Beam-forming Unit (DBU)) with a CalTone and then couple a part of the transmitted signal to the receiver. We created a mathematical model and a simulation tool to estimate the errors in such a calibration system and aid in the system design. The frequency of the signal can be varied to account for frequency dependencies. We show results with a calibration signals outside the SAR echo signal spectrum and with a varying frequency over time. We then introduce an improved method to estimate the drift and make a prediction. Further, the simulation tool allows for an analysis of the estimation errors.

Item URL in elib:https://elib.dlr.de/133044/
Document Type:Conference or Workshop Item (Speech)
Title:Instrument Error Model for Internal Calibration
Authors:
AuthorsInstitution or Email of AuthorsAuthor's ORCID iD
Kroll, Jan PaulJan.Kroll (at) dlr.dehttps://orcid.org/0000-0003-3131-2480
Younis, Marwanmarwan.younis (at) dlr.dehttps://orcid.org/0000-0002-8563-7371
Krieger, GerhardGerhard.Krieger (at) dlr.dehttps://orcid.org/0000-0002-4548-0285
Date:2020
Journal or Publication Title:2020 German Microwave Conference (GeMiC 2020)
Refereed publication:Yes
Open Access:No
Gold Open Access:No
In SCOPUS:Yes
In ISI Web of Science:Yes
Page Range:pp. 196-199
ISSN:2167-8022
ISBN:978-3-9820-3971-8
Status:Published
Keywords:calibration, multi-channel calibration, internal SAR calibration, SAR internal errors, instrument calibration simulator
Event Title:German Microwave Conference (GeMiC)
Event Location:Cottbus-Senftenberg, Germany
Event Type:international Conference
Event Dates:2020-03-09 - 2020-03-11
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:20 Dec 2019 17:26
Last Modified:14 Jan 2021 19:12

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