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Volume 12
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Article

The High-Resolution Digital-Beamforming Airborne SAR System DBFSAR

by
Andreas Reigber
*,
Eric Schreiber
,
Kurt Trappschuh
,
Sebastian Pasch
,
Gerhard Müller
,
Daniel Kirchner
,
Daniel Geßwein
,
Stefan Schewe
,
Anton Nottensteiner
,
Markus Limbach
,
Alicja Schreiber
,
Tobias Rommel
,
Ralf Horn
,
Marc Jäger
,
Rolf Scheiber
,
Stefan V. Baumgartner
,
Sushil Kumar Joshi
,
André Barros Cardoso da Silva
and
Alberto Moreira
Microwaves and Radar Institute, German Aerospace Center (DLR), Münchener Str. 20, D-82230 Oberpfaffenhofen, Germany
*
Author to whom correspondence should be addressed.
Remote Sens. 2020, 12(11), 1710; https://doi.org/10.3390/rs12111710
Submission received: 30 April 2020 / Revised: 20 May 2020 / Accepted: 23 May 2020 / Published: 27 May 2020
(This article belongs to the Special Issue Airborne SAR: Data Processing, Calibration and Applications)
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Abstract

Synthetic Aperture Radar (SAR) is an established remote sensing technique that can robustly provide high-resolution imagery of the Earth’s surface. However, current space-borne SAR systems are limited, as a matter of principle, in achieving high azimuth resolution and a large swath width at the same time. Digital beamforming (DBF) has been identified as a key technology for resolving this limitation and provides various other advantages, such as an improved signal-to-noise ratio (SNR) or the adaptive suppression of radio interference (RFI). Airborne SAR sensors with digital beamforming capabilities are essential tools to research and validate this important technology for later implementation on a satellite. Currently, the Microwaves and Radar Institute of the German Aerospace Center (DLR) is developing a new advanced high-resolution airborne SAR system with digital beamforming capabilities, the so-called DBFSAR, which is planned to supplement its operational F-SAR system in near future. It is operating at X-band and features 12 simultaneous receive and 4 sequential transmit channels with 1.8 GHz bandwidth each, flexible DBF antenna setups and is equipped with a high-precision navigation and positioning unit. This paper aims to present the DBFSAR sensor development, including its radar front-end, its digital back-end, the foreseen DBF antenna configuration and the intended calibration strategy. To analyse the status, performance, and calibration quality of the DBFSAR system, this paper also includes some first in-flight results in interferometric and multi-channel marine configurations. They demonstrate the excellent performance of the DBFSAR system during its first flight campaigns.
Keywords: SAR; sensors; digital beamforming; calibration; polarimetry; interferometry; MTI SAR; sensors; digital beamforming; calibration; polarimetry; interferometry; MTI

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MDPI and ACS Style

Reigber, A.; Schreiber, E.; Trappschuh, K.; Pasch, S.; Müller, G.; Kirchner, D.; Geßwein, D.; Schewe, S.; Nottensteiner, A.; Limbach, M.; et al. The High-Resolution Digital-Beamforming Airborne SAR System DBFSAR. Remote Sens. 2020, 12, 1710. https://doi.org/10.3390/rs12111710

AMA Style

Reigber A, Schreiber E, Trappschuh K, Pasch S, Müller G, Kirchner D, Geßwein D, Schewe S, Nottensteiner A, Limbach M, et al. The High-Resolution Digital-Beamforming Airborne SAR System DBFSAR. Remote Sensing. 2020; 12(11):1710. https://doi.org/10.3390/rs12111710

Chicago/Turabian Style

Reigber, Andreas, Eric Schreiber, Kurt Trappschuh, Sebastian Pasch, Gerhard Müller, Daniel Kirchner, Daniel Geßwein, Stefan Schewe, Anton Nottensteiner, Markus Limbach, and et al. 2020. "The High-Resolution Digital-Beamforming Airborne SAR System DBFSAR" Remote Sensing 12, no. 11: 1710. https://doi.org/10.3390/rs12111710

APA Style

Reigber, A., Schreiber, E., Trappschuh, K., Pasch, S., Müller, G., Kirchner, D., Geßwein, D., Schewe, S., Nottensteiner, A., Limbach, M., Schreiber, A., Rommel, T., Horn, R., Jäger, M., Scheiber, R., Baumgartner, S. V., Joshi, S. K., Barros Cardoso da Silva, A., & Moreira, A. (2020). The High-Resolution Digital-Beamforming Airborne SAR System DBFSAR. Remote Sensing, 12(11), 1710. https://doi.org/10.3390/rs12111710

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