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315 results on '"Scheiber, Rolf"'

6. VERITAS Interferometric SAR (VISAR) Activities at DLR

Author

Younis, Marwan, Amao Oliva, Joel Alfredo, Eineder, Michael, Fritz, Thomas, Gisinger, Christoph, Krieger, Gerhard, Horn, Ralf, Lachaise, Marie, Prats, Pau, Reigber, Andreas, Rodriguez Cassola, Marc, Scheiber, Rolf, Villano, Michelangelo, and Zonno, Mariantonietta

Subjects
InSAR, VISAR, VERITAS, SAR
Published
2022

7. Dynamic Predictive Quantization for Staggered SAR: Experiments with Real Data

Author

Gollin, Nicola, Giez, Jakob, Martone, Michele, Rizzoli, Paola, Scheiber, Rolf, and Krieger, Gerhard

Subjects
Synthetic Aperture Radar (SAR), data volume reduction, F-SAR, Electrical and Electronic Engineering, Geotechnical Engineering and Engineering Geology, raw data quantization
Published
2022

9. Efficient On-Board Quantization and Data Reduction Methods for Present and Next-Generation SAR Systems Recent Advances and Future Perspectives

Author

Martone, Michele, Rizzoli, Paola, Gollin, Nicola, Scheiber, Rolf, and Krieger, Gerhard

Subjects
Quantization, Multi-Channel SAR, Staggered SAR, Synthetic Aperture Radar, Data Volume Reduction
Abstract

Session 3A-Martone-Efficient On-Board Quantization and Data Reduction Methods for Present and Next-Generation SAR Systems Recent Advances and Future Perspectives

Published
2022
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28. The BIOMASS DEM Prototype Processor: Overview and First Results

Author

Pinheiro, Muriel, primary, Mancon, Simone, additional, D'Alessandro, Mauro Mariotti, additional, Prats, Pau, additional, Amao, Joel, additional, Sakar, Nida, additional, Del Campo Becerra, Gustavo Martin, additional, Nannini, Matteo, additional, Scheiber, Rolf, additional, Alonso, Alberto, additional, Jaeger, Marc, additional, Yague-Martinez, Nestor, additional, Banda, Francesco, additional, Giudici, Davide, additional, Tebaldini, Stefano, additional, Papathanassiou, Kostas, additional, and Scipal, Klaus, additional

Published
2021
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30. The GeoWAM Campaign: An Update

Author

Amao-Oliva, Joel, primary, Pinheiro, Muriel, additional, Jaeger, Marc, additional, Scheiber, Rolf, additional, Horn, Ralf, additional, and Reigber, Andreas, additional

Published
2021
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34. The Biomass DEM product prototype processor: An overview

Author

Pinheiro, Muriel, Mancon, Simone, Tebaldini, Stefano, Giudici, Davide, Mariotti, Mauro, Nannini, Matteo, Scheiber, Rolf, Prats, Pau, Piantanida, Ricardo, Banda, Francesco, Yague-Martinez, Nestor, Papathanassiou, Konstantinos, and Scipal, Klaus

Subjects
InSAR, DEM, BIOMASS
Published
2021

35. Estimation of the minimum number of tracks for SAR tomography

Author

Nannini, Matteo, Scheiber, Rolf, and Moreira, Alberto

Subjects
Synthetic aperture radar -- Design and construction, Synthetic aperture radar -- Usage, Tomography -- Methods, Interferometry -- Methods, Business, Earth sciences, Electronics and electrical industries
Abstract

Synthetic aperture radar tomography (SARTom) is the natural extension of SAR interferometry to solve for multiple phase centers within a resolution cell and obtain the 3-D representation of a scene. This paper deals with the determination of the minimum number of tracks required to perform SARTom. Through the prolate spheroidal wave functions, the number of equivalent targets of a volumetric source is derived, and from it, the minimum number of observations required to apply subspace superresolution methods is computed. The minimum tomographic aperture length is also investigated. The results are validated on real data acquired in L-band by the experimental SAR system of the German Aerospace Center. Index Terms--Synthetic aperture radar tomography (SARTom), superresolution, system dimension.

Published
2009

36. Estimation of the surface velocity field of the Aletsch glacier using multibaseline airborne SAR interferometry

Author

Prats, Pau, Scheiber, Rolf, Reigber, Andreas, Andres, Christian, and Horn, Ralf

Subjects
Synthetic aperture radar -- Usage, Interferometry -- Methods, Glaciers -- Observations, Business, Earth sciences, Electronics and electrical industries
Abstract

This paper presents a methodology to process airborne interferometric synthetic aperture radar (SAR) data to measure surface velocity fields (SVFs) of temperate glaciers, and applies it to data acquired over the Aletsch glacier. The first part of this paper deals with the main limitation in airborne interferometric SAR to retrieve reliable interferometric products, namely, the existence of the so-called residual motion errors--inaccuracies on the order of a few centimeters in the navigation system. An extended multisquint approach is proposed for their estimation in the case of nonstationary scenes. The second part of this paper expounds an efficient methodology to derive SVFs with airborne systems, where the line-of-sight displacement is estimated using differential interferometry and the along-track component by estimating the azimuth coregistration offsets. The necessary steps to finally obtain the 3-D SVF are also presented, as well as the possibility of combining different acquisition geometries. Airborne interferometric SAR data acquired by the Experimental SAR system of the German Aerospace Center over the Aletsch glacier, located in the Swiss Alps, are used to evaluate the performance of the proposed approach. The motion of the corner reflectors deployed in the scene is retrieved with an accuracy between 1 and 5 cm/day using L-band data. Index Terms--Cryosphere, differential synthetic aperture radar (SAR) interferometry (DInSAR), SAR interferometry.

Published
2009

37. An autofocus approach for residual motion errors with application to airborne repeat-pass SAR interferometry

Author

de Macedo, Karlus A. Camara, Scheiber, Rolf, and Moreira, Alberto

Subjects
Algorithms -- Usage, Synthetic aperture radar -- Usage, Interferometry -- Methods, Interferometry -- Buildings and facilities, Remote sensing -- Research, Algorithm, Business, Earth sciences, Electronics and electrical industries
Abstract

Airborne repeat-pass SAR systems are very sensible to subwavelength deviations from the reference track. To enable repeat-pass interferometry, a high-precision navigation system is needed. Due to the limit of accuracy of such systems, deviations in the order of centimeters remain between the real track and the processed one, causing mainly undesirable phase undulations and misregistration in the interferograms, referred to as residual motion errors. Up to now, only interferometric approaches, as multisquint, are used to compensate for such residual errors. In this paper, we present for the first time the use of the autofocus technique for residual motion errors in the repeat-pass interferometric context. A very robust autofocus technique has to be used to cope with the demands of the repeat-pass applications. We propose a new robust autofocus algorithm based on the weighted least squares phase estimation and the phase curvature autofocus (PCA) extended to the range-dependent case. We call this new algorithm weighted PCA. Different from multisquint, the autofocus approach has the advantage of being able to estimate motion deviations independently, leading to better focused data and correct impulse-response positioning. As a consequence, better coherence and interferometric-phase accuracy are achieved. Repeat-pass interferometry based only on image processing gains in robustness and reliability, since its performance does not deteriorate with time decorrelation and no assumptions need to be made on the interferometric phase. Repeat-pass data of the E-SAR system of the German Aerospace Center (DLR) are used to demonstrate the performance of the proposed approach. Index Terms--Airborne, autofocus, differential synthetic-aperture-radar interferometry (D-InSAR), estimation, residual motion error.

Published
2008

38. Unsupervised Clustering of C-Band Polsar Data Over Sea ICE

Author

Hänsch, Ronny, Amao Oliva, Joel Alfredo, Horn, Ralf, Jäger, Marc, and Scheiber, Rolf

Subjects
geography, geography.geographical_feature_category, 010504 meteorology & atmospheric sciences, C band, Sea Ice, 0211 other engineering and technologies, Polarimetry, PolSAR, 02 engineering and technology, 01 natural sciences, Sea ice, Focus (optics), Unsupervised clustering, Geology, 021101 geological & geomatics engineering, 0105 earth and related environmental sciences, Remote sensing
Abstract

This paper presents first results for an automatic interpretation of SAR images of sea ice acquired in the Davis Strait off the coast of Baffin Island in 2019. While the study provides multi-frequency and interferometric data collected by the DLR F-SAR airborne SAR sensor, we focus on the analysis of C-band as one of the most commonly used frequencies for sea ice monitoring. We apply an iterative version of polarimetric k-Means which allows to work on the local variance-covariance matrices directly. The obtained clusters show very distinct polarimetric as well as topological properties, which indicates that they are closely related to different sea ice types.

Published
2020

39. Dual-Frequency Airborne SAR for Large Scale Mapping of Tidal Flats

Author

Pinheiro, Muriel, Amao-Oliva, Joel, Scheiber, Rolf, Jaeger, Marc, Horn, Ralf, Keller, Martin, Fischer, Jens, and Reigber, Andreas

Subjects
Synthetic Aperture Radar (SAR), high resolution, digital elevation model, SAR Polarimetry, lcsh:Q, tidal flats, lcsh:Science, SAR interferometry, Institut für Hochfrequenztechnik und Radarsysteme
Abstract

Digital elevation models of tidal flats are a most valuable data source for the water management of coastal areas and need frequent updates to account for changes in sedimentation, erosion and identification of damages in building infrastructure. This paper presents the conceptual design, the processing methodology and first results of an airborne SAR campaign conducted in July 2019 at the German North Sea coast, showing the potential for accurate monitoring of height changes at decimeter level in mudflat areas, as well as indication of vegetation cover and water flooded areas.

Published
2020

40. The High-Resolution Digital-Beamforming Airborne SAR System DBFSAR

Author

Reigber, Andreas, Schreiber, Eric, Trappschuh, Kurt, Pasch, Sebastian, Müller, Gerhard, Kirchner, Daniel, Geßwein, Daniel, Schewe, Stefan, Nottensteiner, Anton, Limbach, Markus, Schreiber, Alicja, Rommel, Tobias, Horn, Ralf, Jäger, Marc, Scheiber, Rolf, Baumgartner, Stefan V., Joshi, Sushil Kumar, Barros Cardoso da Silva, Andre, and Moreira, Alberto

Subjects
lcsh:Q, digital beamforming, interferometry, sensors, calibration, lcsh:Science, MTI, SAR, polarimetry
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.

Published
2020

43. S4Pro Application and Mission Scenrios

Author

Freddi, Riccardo, Scheiber, Rolf, Queiroz de Almeida, Felipe, Villano, Michelangelo, Martone, Michele, and Longo, Riccardo

Subjects
remote sensing, onboard payload data processing, GNSS, Satelliten-SAR-Systeme, optic, SAR-Technologie, Radarkonzepte, SAR
Abstract

This document represents deliverable D1.1 prepared in the frame of Task 1.1 of Work Package 1 of S4Pro project H2020 Grant agreement number 822014. This deliverable contains the description of S4Pro relevant to: - candidate Earth observation applications, specifically optics applications, SAR applications, and GNSS applications; - state of the art analysis for key-enabling technologies relevant to such applications; - payload data processing and communication

Published
2019

44. S4Pro - On-board Payload Processing Requirements

Author

Scheiber, Rolf, Queiroz de Almeida, Felipe, Martone, Michele, Villano, Michelangelo, and Freddi, Riccardo

Subjects
remote sensing, onboard payload data processing, optical, Satelliten-SAR-Systeme, SAR-Technologie, Radarkonzepte, SAR
Abstract

This document represents deliverable D1.3 prepared in the frame of Task 1.3 of Work Package 1 of S4Pro project H2020 Grant agreement number 822014. This deliverable contains the description of identified S4Pro applications relevant to deriving: - different payloads' on-board resources requirements; - analyses of requirements to identify, for each payload, the requirements in terms of data throughput and computational load; - identification of the most suitable radar (DLR) and optical (OHB-I) applications for the S4PRO computing system; - selection for implementation of a significant subset of payload data processing algorithms suitable for the applications considered in T1.1; - preliminary benchmark plan. Finally, a summary of formalized requirements on the S4Pro hardware concludes the document.

Published
2019

45. Airborne differential SAR interferometry: first results at L-Band

Author

Reigber, Andreas and Scheiber, Rolf

Subjects
Interferometry -- Research, Synthetic aperture radar -- Research, Business, Earth sciences, Electronics and electrical industries
Abstract

In recent years, differential interferometry using spaceborne synthetic aperture radar (SAR) sensors has become an established technique for detecting and monitoring centimeter-scale detbrmations of the earth's surface, as well as glacier flows and land slides. Although often very efficient, the use of spaceborne SAR data has several drawbacks, namely phase artifacts caused by atmospheric effects and very low coherence due to long data acquisition intervals and the short radar wavelength of the sensor. Most important, current spaceborne sensors are not able to ensure flexible monitoring of critical regions. Airborne sensors may overcome most of the problems mentioned above, but up to now, the operational use of airborne differential SAR interferometry has been prevented by insufficiently accurate motion compensation of the platform. In this letter, first results of airborne differential interferometry using the German Aerospace Center (DLR) experimental SAR system (E-SAR) in the interferometric repeat-pass mode are addressed. This includes an analysis of long-term decorrelation behavior in L-band and, particularly, the correction of residual motion errors in heavily decorrelated interferograms. A first differential interferogram of agricultural and forested areas is presented and analyzed. Index Terms--Airborne, differential interferometry, motion errors, synthetic aperture radar (SAR).

Published
2003

46. Multi-Platform, Multi-Frequency SAR Campaign with the F-SAR and Miranda35 Sensors

Author

Henke, Daniel, primary, Dominguez, Elias Mendez, additional, Fagir, Julian, additional, Fritsche, Liv, additional, Horn, Ralf, additional, Scheiber, Rolf, additional, Reigber, Andreas, additional, Sieger, Stefan, additional, Janssen, Daniel, additional, Kloppel, Frank, additional, Caris, Michael, additional, Stanko, Stephan, additional, Renker, Matthias, additional, and Wellig, Peter, additional

Published
2020
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