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Ciani, Daniele (author), Sabatini, Mattia (author), Buongiorno Nardelli, Bruno (author), Lopez Dekker, F.J. (author), Rommen, Björn (author), Wethey, David S. (author), Yang, Chunxue (author), Liberti, Gian Luigi (author)The Harmony satellite mission was recently approved as the next European Space Agency (ESA) Earth Explorer 10. The mission science objectives cover several applications related to solid earth, the cryosphere, upper-ocean dynamics and air–sea interactions. The mission consists of a constellation of two satellites, flying with the Copernicus...journal article 2023
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Iannini, L. (author), Comite, D. (author), Pierdicca, N. (author), Lopez Dekker, F.J. (author)Bistatic scattering from rough surfaces is typically approached through the analysis of the scattered field in the conventional H and V polarization basis, which coincides with the zenith and azimuth unit vectors in a spherical reference frame. This study delves into the impacts of different choices of the transmit and receive linear basis on...journal article 2022
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Nikaein, T. (author), Kummer, Vineet (author), Steele-Dunne, S.C. (author), Lopez Dekker, F.J. (author)This paper presents an approach to implement a forward model for Sentinel-1 copol and crosspol backscatter and coherence using crop bio-geophysical parameters namely leaf area index, biomass, canopy height, soil moisture and root zone moisture as inputs for the maize. These required input parameters are generated using Decision Support System...conference paper 2022
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Caldarella, Nina (author), Lopez Dekker, F.J. (author), Prats-Iraola, Pau (author), Nouguier, Frederic (author), Chapron, Bertrand (author), Zonno, Mariantonietta (author), Rodriguez-Cassola, Marc (author)Observations of wind and ocean surface velocity vectors by along-track interferometry (ATI) with the synthetic aperture radar (SAR) are not only important for direct applications but also to increase understandings of ocean upper layer mixing, air-ocean interactions, and mapping submesoscale (1-10 km) structures. An experimental bidirectional...journal article 2022
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Li, W. (author), Lhermitte, S.L.M. (author), Lopez Dekker, F.J. (author)Surface meltwater drains on several Antarctic ice shelves, resulting in surface and sub-surface lakes that are potentially critical for the ice shelf collapse. Despite these phenomena, our understanding and assessment of the drainage and refreezing of these lakes is limited, mainly due to lack of field observations and to the limitations of...journal article 2021
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Nikaein, T. (author), Iannini, L. (author), Molijn, R.A. (author), Lopez Dekker, F.J. (author)Synthetic aperture radar (SAR) acquisitions are mainly deemed suitable for mapping dynamic land-cover and land-use scenarios due to their timeliness and reliability. This particularly applies to Sentinel-1 imagery. Nevertheless, the accurate mapping of regions characterized by a mixture of crops and grasses can still represent a challenge....journal article 2021
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Kleinherenbrink, M. (author), Korosov, Anton (author), Newman, Thomas (author), Theodosiou, A. (author), Komarov, Alexander S. (author), Li, Y. (author), Mulder, G. (author), Rampal, Pierre (author), Stroeve, Julienne (author), Lopez Dekker, F.J. (author)This article describes the observation techniques and suggests processing methods to estimate dynamical sea-ice parameters from data of the Earth Explorer 10 candidate Harmony. The two Harmony satellites will fly in a reconfigurable formation with Sentinel-1D. Both will be equipped with a multi-angle thermal infrared sensor and a passive...journal article 2021
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De Zan, Francesco (author), Rocca, Fabio (author), Ferretti, Alessandro (author), Lopez Dekker, F.J. (author), Eineder, Michael (author)A recent publication claims that closure phases in SAR interferometry bear no relationship to physical changes of the scatterer, but only to the statistical properties of the averaged pixels. We disprove this claim with a simple counterexample and remind the reader of cases in which closure phases indicate a clear physical content, including...journal article 2021
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Matar, Jalal (author), Rodriguez-Cassola, Marc (author), Krieger, Gerhard (author), Lopez Dekker, F.J. (author), Moreira, Alberto (author)Existing microwave remote sensing instruments used for Earth observation face a clear tradeoff between spatial resolution and revisit times at global scales. The typical imaging capabilities of current systems range from daily observations at kilometer-scale resolutions provided by scatterometers to meter-scale resolutions at lower temporal...journal article 2020
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Yang, M. (author), Dheenathayalan, P. (author), Lopez Dekker, F.J. (author), van Leijen, F.J. (author), Liao, Mingsheng (author), Hanssen, R.F. (author)Persistent Scatterer Interferometry (PSI) is a time series remote sensing technique to estimate displacements of geo-objects from the interferometric phases of selected Persistent Scatterers (PS). The relative position of a scatterer within a resolution cell causes an additional phase contribution in the observed phase, which needs to be...journal article 2020
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Dogan, O. (author), Uysal, Faruk (author), Lopez Dekker, F.J. (author)A wide-swath synthetic aperture radar (SAR) image is known to be achievable by merging multistatic aliased data that is collected with an appropriate along-track displacement. However, in terms of both flexibility requirements like potentiality of both along-track and cross-track (XT) interferometry and design requirements like orbital safety,...journal article 2020
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Dogan, O. (author), Uysal, Faruk (author), Hoogeboom, P. (author), Lopez Dekker, F.J. (author), Li, Y. (author)This paper discusses the design details of a high resolution, low "Size, Weight, Power and Cost" (SWaP-C) radar altimeter (RA) system. Operating frequency of the radar is chosen within the Ka-band to achieve the desired size and weight requirements, that are highly demanded for the small satellite missions in a cost-efficient way. We propose a...conference paper 2020
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Zhang, Hao (author), Lopez Dekker, F.J. (author), Li, Shaoning (author)The performance of Persistent Scatterer Interferometry (PSI) depends heavily on Persistent Scatterer (PS) density. In order to increase PS density, we can apply Super-Resolution reprocessing algorithms in PSI. Involving the reprocessing algorithms and the peak-detection-based Persistent Scatterer Candidate points (PSCs) selection method, the...journal article 2020
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Iannini, L. (author), Mancinelli, A. (author), Lopez Dekker, F.J. (author), Hoogeboom, P. (author), Li, Y. (author), Uysal, Faruk (author), Yarovoy, Alexander (author)The work investigates staggered and random PRF (Pulse Repetition Frequency) strategies for a close formation of small Synthetic Aperture Radar (SAR) satellites operating in a multistatic configuration. The satellites are positioned within a fraction of the along-track critical baseline, hence allowing for the application of Displaced Phase...conference paper 2019
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- Li, W. (author), Lhermitte, S.L.M. (author), Lopez Dekker, F.J. (author) poster 2019
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Lopez Dekker, F.J. (author), Biggs, Juliet (author), Chapron, Bertrand (author), Hooper, Andy (author), Kääb, Andreas (author), Massina, Simona (author), Mouginot, Jeremie (author), Buongiorno Nardelli, Bruno (author), Pasquero, Claudia (author)This paper provides a compact overview of Harmony, an Earth Explorer 10 mission candidate dedicated to the observation of dynamic deformations of ice, solid earth and ocean surfaces. Harmony consists of two receive-only small Synthetic Aperture Radar (SAR) satellites using Sentinel-1 as illuminator, which will alternate close formation phases,...conference paper 2019
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Zhang, H. (author), Lopez Dekker, F.J. (author)Capon's minimum-variance method (MVM) and amplitude and phase estimation (APES) spectral estimation algorithms can be applied to synthetic aperture radar (SAR) processing to improve the resolution and suppress sidelobe levels. In this paper, we use Capon-/APES-based SAR reprocessing algorithms to increase the persistent scatterer (PS) density...journal article 2019
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Yang, M. (author), Lopez Dekker, F.J. (author), Dheenathayalan, P. (author), Liao, Mingsheng (author), Hanssen, R.F. (author)To correctly interpret the estimated displacements in InSAR point clouds, especially in the built environment, these need to be linked to real-world structures. This requires the accurate and precise 3D positioning of each point. Artificial ground control points (GCPs), such as corner reflectors, serve this purpose, but since they require...journal article 2019
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Yang, M. (author), Lopez Dekker, F.J. (author), Dheenathayalan, P. (author), Biljecki, Filip (author), Liao, Mingsheng (author), Hanssen, R.F. (author)Persistent scatterers (PSs) are coherent measurement points obtained from time series of satellite radar images, which are used to detect and estimate millimeter-scale displacements of the terrain or man-made structures. However, associating these measurement points with specific physical objects is not straightforward, which hampers the...journal article 2019
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Prats-Iraola, Pau (author), Pinheiro, Muriel (author), Rodriguez-Cassola, Marc (author), Scheiber, Rolf (author), Lopez Dekker, F.J. (author)This paper addresses the aspects of image formation and interferometric processing in the frame of the STEREOID Earth Explorer 10 candidate mission. In particular, the large along-track baseline configuration (approx. 250 km), which results in a high Doppler centroid, will be addressed in terms of bistatic SAR image formation and...conference paper 2019
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