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The DLR Spaceborne SAR Calibration Center

  • Jens Reimann ORCID logo EMAIL logo , Marco Schwerdt , Kersten Schmidt , Nuria Tous Ramon and Björn Döring
Published/Copyright: April 14, 2017
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Abstract

A necessary activity for any SAR system is its calibration to establish the relation between radar measurements and geophysical parameters. During this process, all essential parameters of a SAR image are linked to their geophysical quantities. This includes the geolocation of the SAR image, its backscattering characteristics (in amplitude and in phase) and polarimetric information. The Microwaves and Radar Institute of the DLR has gained extensive experience in these calibration procedures during the last decades and has developed special methods and dedicated reference targets for spaceborne SAR system calibration. Through examples of calibration results obtained for different spaceborne SAR mission, the capabilities of the DLR SAR Calibration Center are presented.

References

[1] F. D. Zan and A. M. Guarnieri, “TOPSAR: Terrain obsercation by progressive scans,” IEEE Trans. Geosci. Remote Sens., vol. 48, no. 2, pp. 2352–2360, 2010.Search in Google Scholar

[2] M. Schwerdt, B. Bräutigam, M. Bachmann, B. Döring, D. Schrank, and J. H. Gonzalez, “Final results of the efficient TerraSAR-X calibration method,” in 2008 IEEE Radar Confrerence, Rome, Italy, 2008.10.1109/RADAR.2008.4720916Search in Google Scholar

[3] J. H. Gonzalez, B. Bräutigam, M. Schwerdt, and M. Bachmann, “Terrasar-x internal calibration experience and extension for tandem-x,” in Proceedings of CEOS SAR Cal/Val Workshop 2008 Oberpfaffenhofen, Germany, 2008.Search in Google Scholar

[4] M. Schwerdt, K. Schmidt, N. T. Ramon, G. C. Alfonzo, B. Döring, M. Zink, and P. Prats, “Independent verification of the Sentinel-1A system calibration - first results,” in 10th European Conference on Synthetic Aperture Radar, Berlin, Germany, 2014.10.1109/IGARSS.2014.6946620Search in Google Scholar

[5] J. Reimann, M. Schwerdt, K. Schmidt, N. T. Ramon, G. A. Castellanos, B. Dãring, D. Rudolf, S. Raab, J. M. W. Antony, and M. Zink, “The DLR SAR calibration center,” in 2015 IEEE 5th Asia-Pacific Conference on Synthetic Aperture Radar (APSAR), Sept. 2015, pp. 169–173.10.1109/APSAR.2015.7306181Search in Google Scholar

[6] M. Schwerdt, B. Bräutigam, M. Bachmann, B. Döring, D. Schrank, and J. H. Gonzalez, “Final TerraSAR-X calibration results based on novel efficient methods,” IEEE Trans. Geosci. Remote Sens., vol. 48, no. 2, pp. 677–689, 2010.10.1109/TGRS.2009.2035308Search in Google Scholar

[7] D. Hounam, M. Schwerdt, and M. Zink, “Active antenna module characterisation by pseudo-noise gating,” in 25th ESA Antenna Workshop on Satellite Antenna Technology, Noordwijk, Netherlands, 2002.Search in Google Scholar

[8] M. Jehle, D. Perler, D. Small, A. Schubert, and E. Meier, “Estimation of atmospheric path delays in TerraSAR-X data using models vs. measurements,” Sensors, vol. 8, no. 12, pp. 8479–8491, 2008.10.3390/s8128479Search in Google Scholar PubMed PubMed Central

[9] O. Frey, E. Meier, D. Nüesch, and A. Roth, “Geometric error budget analysis for TerraSAR-X,” in 5th European Conference on Synthetic Aperture Radar EUSAR, 2004, pp. 513–516.Search in Google Scholar

[10] M. Schwerdt, D. Schrank, M. Bachmann, J. H. Gonzalez, B. Döring, N. Tous-Ramon, and J. W. Antony, “Calibration of the TerraSAR-X and the TanDEM-X satellite for the TerraSAR-X mission,” in 9th European Conference on Synthetic Aperture Radar, 2012.Search in Google Scholar

[11] M. Schwerdt, B. Döring, M. Zink, and D. Schrank, “In-orbit calibration plan for Sentinel-1,” in 8th European Conference on Synthetic Aperture Radar, 2010.Search in Google Scholar

[12] M. Schwerdt, K. Schmidt, N. T. Ramon, G. C. Alfonzo, B. J. Dãring, M. Zink, and P. Prats-Iraola, “Independent verification of the Sentinel-1a system calibration,” IEEE J. Sel. Top. Appl. Earth Obs. Remote Sens., vol. 9, no. 3, pp. 994–1007, Mar. 2016.10.1109/JSTARS.2015.2449239Search in Google Scholar

[13] G. C. Alfonzo, M. Schwerdt, B. Döring, N. T. Ramon, and K. Schmidt, “First results of the Sentinel-1A in-orbit antenna characterization performed by DLR,” in 10th European Conference on Synthetic Aperture Radar, 2014.Search in Google Scholar

[14] B. J. Döring, M. Jirousek, D. Rudolf, S. Raab, J. Reimann, and M. Schwerdt, “The three-transponder method: A novel method for accurate transponder RCS calibration,” Prog. Electromagn. Res. (B)., vol. 61, pp. 297–315, 2015.10.2528/PIERB14110406Search in Google Scholar

[15] B. J. Döring, K. Schmidt, M. Jirousek, R. Daniel, J. Reimann, S. Raab, A. John, and M. Schwerdt, “Hierarchical Bayesian data analysis in radiometric sar system calibration: A case study on transponder calibration with RADARSAT-2 data,” Remote Sens., vol. 5, no. 12, pp. 6667–6690, 2013.10.3390/rs5126667Search in Google Scholar

[16] K. Schmidt, G. C. Alfonzo, N. T. Ramon, M. Bachmann, and M. Schwerdt, “Calibration performance of the TerraSAR-X and TanDEM-X satellites since launch,” in 10th European Conference on Synthetic Aperture Radar, 2014.Search in Google Scholar

[17] M. Schwerdt, J. H. Gonzalez, M. Bachmann, D. Schrank, B. Döring, N. T. Ramon, and J. M. W. Antony, “In-orbit calibration of the TanDEM-X System,” in 30th International Geoscience And Remote Sensing Symposium, Vancouver, Canada, 2011.10.1109/IGARSS.2011.6049699Search in Google Scholar

[18] A. Freeman, “Calibration of linearly polarized polarimetric SAR data subject to Faraday rotation,” IEEE Trans. Geosci. Remote Sens., vol. 42, pp. 8, 2004.10.1109/TGRS.2004.830161Search in Google Scholar

[19] M. Schwerdt, D. Schrank, M. Bachmann, C. Schulz, B. Döring, and J. H. Gonzales, “TerraSAR-X re-calibration and dual receive antenna performed in 2009,” in 8th European Conference on Synthetic Aperture Radar, Aachen, Germany, 2010.Search in Google Scholar

Received: 2016-9-19
Published Online: 2017-4-14
Published in Print: 2017-10-26

© 2017 Walter de Gruyter GmbH, Berlin/Boston

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