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Your search keyword '"Hägelen, Manfred"' showing total 15 results
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15 results on '"Hägelen, Manfred"'

1. Microwave Structural Health Monitoring of the Grouted Connection of a Monopile-Based Offshore Wind Turbine: Fatigue Testing Using a Scaled Laboratory Demonstrator

Author

Maetz, Thomas, primary, Kappel, Jonas, additional, Wiemann, Marcel, additional, Bergmannshoff, Dirk, additional, Hägelen, Manfred, additional, Jetten, Rainer, additional, Schmidt, Matthias, additional, Käsgen, Johannes, additional, Jackel, Marco, additional, Moll, Jochen, additional, Kraemer, Peter, additional, and Krozer, Viktor, additional

Published
2023
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2. RADAR-BASED STRUCTURAL MONITORING OF WIND TURBINES BLADES: FIELD RESULTS FROM TWO OPERATIONAL WIND TURBINES

Author

MÄLZER, MORITZ, primary, BECK, SEBASTIAN, additional, ALIPEK, SERCAN, additional, REICHART, ELIAS, additional, MOL, JOCHEN, additional, KROZER, VIKTOR, additional, OIKONOMOPOULOS, CHRISTOS, additional, KASSNER,, JÜRGEN, additional, HÄGELEN, MANFRED, additional, HEINECKE, THOMAS, additional, CERBE, BURKHARD, additional, ROSE, JONAS, additional, KLUMPP, VESA, additional, BERGER, MARTIN, additional, and KOHL, MARIO, additional

Published
2023
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7. TeraSCREEN: multi-frequency multi-mode Terahertz screening for border checks

Author

Alexander, Naomi E., additional, Alderman, Byron, additional, Allona, Fernando, additional, Frijlink, Peter, additional, Gonzalo, Ramón, additional, Hägelen, Manfred, additional, Ibáñez, Asier, additional, Krozer, Viktor, additional, Langford, Marian L., additional, Limiti, Ernesto, additional, Platt, Duncan, additional, Schikora, Marek, additional, Wang, Hui, additional, and Weber, Marc Andree, additional

Published
2014
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13. Focus FMCW SAR Data Using the Wavenumber Domain Algorithm.

Author

Wang, Robert, Loffeld, Otmar, Nies, Holger, Knedlik, Stefan, Hägelen, Manfred, and Essen, Helmut

Subjects
CONTINUOUS wave radar, SYNTHETIC aperture radar, ALGORITHMS, REMOTE sensing, DETECTORS
Abstract

The combination of frequency-modulation continuous-wave (FMCW) technology and synthetic aperture radar (SAR) promises a lightweight, cost-effective, and high-quality imaging sensor for remote sensing. However, the long signal duration time leads to the failure of the conventional start/stop approximation of the pulsed SAR. In this paper, a signal model is proposed to address the effects of the continuous motion during the transmit time on the echoed signal. Based on the model, an analytical point target reference spectrum is derived. From the spectrum, it will be seen that the continuous motion introduces an additional range-azimuth coupling term and a range walk term compared with the conventional pulsed SAR. The range walk term is well known, whereas the foregoing range-azimuth coupling term is formulated for the first time in the FMCW SAR community. For the squint and spotlight modes, these range walk and range-azimuth coupling terms might significantly degrade the image quality. In this paper, based on the proposed analytical signal model, we further discuss the application of the wavenumber domain algorithm for the FMCW SAR data. In addition, different approximations of the Stolt mapping are made to highlight the effect of the range-dependent higher-order range-azimuth coupling terms on the 2-D impulse responses. Finally, X-band simulated experiments and Ka-band real FMCW SAR data are used to validate the signal model and the processing method. [ABSTRACT FROM AUTHOR]

Published
2010
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15. A new approach for fast security scanning with millimetre-waves: SARGATE

Author

Lang, Stefan A., Hägelen, Manfred, Ender, Joachim, Hantscher, Sebastian, and Essen, Helmut

Abstract

Measuring many people within a short time is still a great challenge to scanners in security related areas, e.g. airports or stations. A new approach for fast and high resolution scanning is presented, based on the so called "circular synthetic aperture radar" (CSAR), applied to a walkway. Due to the circular movement, each of the receiving antennas creates a circular synthetic aperture itself. By reconstructing the complex valued SAR-images for each receiver channel, the ability to perform interferometric SAR-Analysis of a tested person is given. The screened persons do not have to stand still, thus, a measurement in a passenger flow is possible.

Published
2011
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