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Ara es mostren els items 25-44 de 167

    • Beamformer characterization of the MIR instrument: the microwave interferometric reflectometer 

      Onrubia Ibáñez, Raúl; Pascual Biosca, Daniel; Querol Borràs, Jorge; Hyuk, Park; Camps Carmona, Adriano José (Institute of Electrical and Electronics Engineers (IEEE), 2017)
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      Global Navigation Satellite Systems - Reflectometry (GNSS-R) has opened promising results for remote sensing applications. The broadcast of new signals with wider bandwidth provides an opportunity to increase the performance ...

    • BIBLOS for simulation of the Earth observation missions 

      Kedzierawski, Robert; Oryszczak, Wojciech; Szczepankiewicz, Karolina; Camps Carmona, Adriano José; Hyuk, Park; Barrios García, Pedro A. (International Society for Photo-Optical Instrumentation Engineers (SPIE), 2019)
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      End-to-End Mission Performance Simulators for Earth Observation missions are one of the prominent tools for system design and scientific validation in early mission phases. The European Space Agency has promoted efforts ...

    • Biblos: building blocks for earth observation mission performance simulators 

      Soto, Lucía; Szczepankiewicz, Karolina; Kedzierawski, Robert; Negueruela Ruiz, Cristina de; Camps Carmona, Adriano José; Hyuk, Park; Metselaar, H.; Franco, Raffaella (European Space Agency (ESA), 2017)
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      End-to-end mission performance simulators for Earth Observation missions are one of the prominent tools for system design and scientific validation in early mission phases. The European Space Agency (ESA)has promoted efforts ...

    • Calibration of GNSS-R receivers with PRN signal injection: methodology and validation with the microwave interferometric reflectometer (MIR) 

      Pascual Biosca, Daniel; Onrubia Ibáñez, Raúl; Querol Borràs, Jorge; Hyuk, Park; Camps Carmona, Adriano José (Institute of Electrical and Electronics Engineers (IEEE), 2017)
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      The demonstration of the feasibility of navigation signals signals for remote sensing has lead to a significant increase of new GNSS-R instruments in the recent years. Despite of the type instrument, the observables are ...

    • Calibration, performance, and imaging tests of a fully digital synthetic aperture interferometer radiometer 

      Ramos Pérez, Isaac; Forte Veliz, Giuseppe Francesco; Camps Carmona, Adriano José; Bosch Lluís, Xavier; Valencia Domènech, Enric; Rodríguez Álvarez, Nereida; Hyuk, Park; Vall-Llossera Ferran, Mercedes Magdalena (2012-06-28)
      Article
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      This work presents the calibration, characterization, and imaging tests of the Passive Advanced Unit-Synthetic Aperture instrument (PAU-SA). PAU-SA is a fully digital -shaped two-dimensional synthetic aperture interferometric ...

    • Can we measure vegetation water content and vegetation opacity at L-band with a single GPS receiver? 

      Alonso Arroyo, Alberto; Querol Borràs, Jorge; Camps Carmona, Adriano José; Onrubia Ibáñez, Raúl; Hyuk, Park; Pascual Biosca, Daniel (Institute of Electrical and Electronics Engineers (IEEE), 2016)
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      This work shows a technique to estimate the vegetation opacity and infer the vegetation water content using a single GPS receiver located under the vegetation layer being analyzed. It is based on the measurement of the ...

    • Common mathematical framework for real and synthetic aperture by interferometry radiometers 

      Bosch Lluís, Xavier; Ramos Pérez, Isaac; Camps Carmona, Adriano José; Rodríguez Álvarez, Nereida; Valencia Domènech, Enric; Hyuk, Park (Institute of Electrical and Electronics Engineers (IEEE), 2014-01)
      Article
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      This work focuses on the relationship between real and synthetic aperture radiometers giving a general and common mathematical framework for both of them. It will be demonstrated that a real aperture radiometer array ...

    • Comparison of GNSS-R processing techniques for spaceborne ocean altimetry 

      Martín Alemany, Francisco; d'Addio, Salvatore; Camps Carmona, Adriano José; Martín Neira, Manuel; Hyuk, Park; Pascual Biosca, Daniel (Institute of Electrical and Electronics Engineers (IEEE), 2013)
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      Earth-reflected Global Navigation Satellite System (GNSS) have become an attractive tool to be employed in low-Earth-orbit spaceborne missions, for applications such as ocean mesoscale altimetry and scatterometry. For such ...

    • Comparison of GPS L1 and Galileo E1 signals for GNSS-R ocean altimetry 

      Pascual Biosca, Daniel; Hyuk, Park; Camps Carmona, Adriano José; Alonso Arroyo, Alberto; Onrubia Ibáñez, Raúl (Institute of Electrical and Electronics Engineers (IEEE), 2013)
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      In the last years, the GPS signals have been validated as opportunity signals in a wide range of reflectometry-based remote sensing applications for sea, land or ice scenarios. Recently, the first Galileo satellites have ...

    • Comparison of real-time time-frequency RFI mitigation techniques in microwave radiometry 

      Querol Borràs, Jorge; Onrubia Ibáñez, Raúl; Pascual Biosca, Daniel; Alonso Arroyo, Alberto; Hyuk, Park; Camps Carmona, Adriano José (Institute of Electrical and Electronics Engineers (IEEE), 2016)
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      Radio-Frequency Interference (RFI) is a well-known problem for Microwave Radiometers (MWR). A number of RFI mitigation techniques have been studied to deal with RFI from the receiver's side. In this study, a comparison in ...

    • Correcting image blurring induced by the ADCS jitter in cubesats 

      Llaveria Godoy, David; Camps Carmona, Adriano José; Hyuk, Park (Institute of Electrical and Electronics Engineers (IEEE), 2020)
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      Attitude determination and control systems (ADCS) are critical in many satellite missions, especially when high pointing accuracy is needed, such as in optical imagers. Current actuators used to control the platform's ...

    • Correcting the ADCS jitter induced blurring in small satellite imagery 

      Llaveria Godoy, David; Camps Carmona, Adriano José; Hyuk, Park (2020-09)
      Article
      Accés obert
      Earth Observation missions have increasingly demanding requirements, i.e., higher spatial resolutions and SNR, and lower revisit times, etc. High-resolution images have to be captured with precise pointing accuracy which ...

    • Correlation between ionosphere scintillation and earthquakes around Coral Sea in 2022 

      Carvajal Librado, Mireia; Molina Ordóñez, Carlos; Boudriki Semlali, Badr Eddine; Hyuk, Park; Camps Carmona, Adriano José (Institute of Electrical and Electronics Engineers (IEEE), 2023)
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      Lithosphere-Atmosphere-Ionosphere coupling models have been widely studied and applied to earthquakes and their potential precursors. Recent evidence has been found that electromagnetic phenomena related to earthquakes ...

    • Cross-correlation waveform analysis for conventional and interferometric GNSS-R approaches 

      Martín Alemany, Francisco; Camps Carmona, Adriano José; Hyuk, Park; d'Addio, Salvatore; Martín Neira, Manuel; Pascual Biosca, Daniel (2014-05-01)
      Article
      Accés restringit per política de l'editorial
      Reflectometry using Global Navigation Satellite System (GNSS-R) signals has become an attractive tool for Earth remote sensing. Back to 1993, it was proposed as an alternative to the conventional spaceborne ocean altimetry ...

    • Cross-correlation waveform mode: a critical review 

      Martín Alemany, Francisco; Hyuk, Park; Camps Carmona, Adriano José; D'Addio, Salvatore; Martín Neira, Manuel (Institute of Electrical and Electronics Engineers (IEEE), 2012)
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      Earth-reflected Global Navigation Satellite System (GNSS) signals have become an attractive tool for remote sensing. Recently it has been proposed as an alternative to the conventional altimetry to estimate the surface ...

    • Cross-talk statistics and impact in interferometric GNSS-R 

      Pascual Biosca, Daniel; Hyuk, Park; Onrubia Ibáñez, Raúl; Alonso Arroyo, Alberto; Querol Borràs, Jorge; Camps Carmona, Adriano José (2016-06-23)
      Article
      Accés obert
      This paper presents a statistical analysis of the crosstalk phenomenon in interferometric Global Navigation Satellite Systems Reflectometry (iGNSS-R). Crosstalk occurs when the Delay-Doppler Map (DDM) of a tracked satellite ...

    • Design and optimization of a polar satellite mission to complement the Copernicus System 

      Alarcón Cot, Eduardo José; Alvaro Sanchez, A.; Araguz López, Carles; Barrot, G.; Bou Balust, Elisenda; Camps Carmona, Adriano José; Cornara, Stefania; Gutiérrez Peña, Pedro Antonio; Lancheros Sepulveda, Estefany Maria; Lesne, O.; Llaveria Godoy, David; Lluch, I.; Males, Jan; Mangin, A.; Matevosyan, H.; Monge, A.; Narkiewicz, J.; Ourevitch, S.; Pierotti, S.; Pica, U.; Poghosyan, A.; Ruiz De Azúa Ortega, Juan Adrián; Hyuk, Park (Institute of Electrical and Electronics Engineers (IEEE), 2018-06-05)
      Article
      Accés obert
      The space industry is currently witnessing two concurrent trends: the increased modularity and miniaturization of technologies and the deployment of constellations of distributed satellite systems. As a consequence of the ...

    • Detecting Targets above the Earth's Surface Using GNSS-R Delay Doppler Maps: Results from TDS-1 

      Hu, Changjiang; Benson, Craig; Hyuk, Park; Camps Carmona, Adriano José; Qiao, Li; Rizos, Chris (Multidisciplinary Digital Publishing Institute (MDPI), 2019-10-07)
      Article
      Accés obert
      : Global Navigation Satellite System (GNSS) reflected signals can be used to remotely sense the Earth’s surface, known as GNSS reflectometry (GNSS-R). The GNSS-R technique has been applied to numerous areas, such as the ...

    • Determination of sea correlation time at L-Band with airborne reflected new GNSS signals 

      Pascual Biosca, Daniel; Onrubia Ibáñez, Raúl; Querol Borràs, Jorge; Castellví Esturi, Jordi; Hyuk, Park; Camps Carmona, Adriano José (Institute of Electrical and Electronics Engineers (IEEE), 2018)
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      The maximum coherent integration time of GNSS reflected (GNSS-R) signals over sea depends on the sea state, as well as on the geometry formed by the receiver, the GNSS satellite and the reflection point. In this paper, ...

    • Development of a drone-based miniaturized flexible microwave payload (FMPL) with MWR, GNSS-R, and RFI instruments 

      Mas Vinolas, Andreu; Pérez Portero, Adrián; Gonga Siles, Amadeu; Hyuk, Park; Camps Carmona, Adriano José (Institute of Electrical and Electronics Engineers (IEEE), 2022)
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      Passive microwave remote sensing encompasses techniques well suited for use in systems with limited power budget, due to the low consumption linked to reception-only operation. Some examples of these techniques include ...