Ara es mostren els items 61-80 de 568

    • Architectural optimization framework for earth-observing heterogeneous constellations : marine weather forecast case 

      Araguz López, Carles; Llaveria Godoy, David; Lancheros Sepulveda, Estefany Maria; Bou Balust, Elisenda; Camps Carmona, Adriano José; Alarcón Cot, Eduardo José; Tonetti, Stefania; Cornara, Stefania; Vicario, Gonzalo; Lluch i Cruz, Ignasi; Matevosyan, Hripsime; Golkar, Alessandro; Cote, Judith; Pierotti, Stéphane; Rodríguez, Pedro; Alvaro Sanchez, A.; Sochacki, Mateusz; Narkiewicz, Janusz (2019-01-25)
      Article
      Accés obert
      Earth observation satellite programs are currently facing, for some applications, the need to deliver hourly revisit times, subkilometric spatial resolutions, and near-real-time data access times. These stringent requirements, ...
    • Architectural optimization results for a network of earth-observing satellite nodes 

      Araguz López, Carles; Llaveria Godoy, David; Lancheros Sepulveda, Estefany Maria; Bou Balust, Elisenda; Camps Carmona, Adriano José; Alarcón Cot, Eduardo José; Lluch i Cruz, Ignasi; Matevosyan, Hripsime; Golkar, Alessandro; Tonetti, Stefania; Cornara, Stefania; Cote, Judith; Pierotti, Stéphane; Rodríguez, Pedro; Alvaro Sanchez, A.; Sochacki, Mateusz; Narkiewicz, Janusz (2017)
      Text en actes de congrés
      Accés obert
      Earth observation satellite programs are currently facing, for some applications, the need to deliver hourly revisit times, sub-kilometric spatial resolutions and near-real-time data access times. These stringent requirements, ...
    • Architectures and synchronization techniques for distributed satellite systems: a survey 

      Martínez Marrero, Liz; Merlano-Duncan, Juan Carlos; Querol Borràs, Jorge; Kumar, Sumit; Krivochiza, Jevgenij; Krishna Sharma, Shree; Chatzinotas, Symeon; Camps Carmona, Adriano José; Ottersten, Björn (Institute of Electrical and Electronics Engineers (IEEE), 2022-04-22)
      Article
      Accés obert
      Cohesive Distributed Satellite Systems (CDSSs) is a key enabling technology for the future of remote sensing and communication missions. However, they have to meet strict synchronization requirements before their use is ...
    • ASG-EUPOS versus ERGNSS; comparison between Polish and Spanish GNSS permanent station networks 

      Torres Mulase, Enrique (Universitat Politècnica de Catalunya, 2012-03-19)
      Projecte/Treball Final de Carrera
      Accés restringit per decisió de l'autor
      Realitzat a/amb:   Uniwersytet Warmińsko-Mazurski w Olsztynie
    • Assessing the quality of ionospheric models through GNSS positioning error: methodology and results 

      Rovira Garcia, Adrià; Ibáñez Segura, Deimos; Orús Pérez, Raul; Juan Zornoza, José Miguel; Sanz Subirana, Jaume; González Casado, Guillermo (2020-01-01)
      Article
      Accés obert
      Single-frequency users of the global navigation satellite system (GNSS) must correct for the ionospheric delay. These corrections are available from global ionospheric models (GIMs). Therefore, the accuracy of the GIM is ...
    • Assessment of a machine-vision-assisted test bed for spacecraft magnetic cleanliness analysis 

      Sans Monguiló, Alejandro; Adiwiluhung Riwanto, Bagus; Praks, Jaan (Universitat Politècnica de Catalunya, 2022-04-29)
      Comunicació de congrés
      Accés obert
      Small satellites are becoming increasingly popular in several applications, in which attitude systems might require high precision performance. These spacecrafts are susceptible to magnetic disturbances in orbit, such as ...
    • Assessment of direct positioning for IR-UWB in IEEE 802.15.4a channels 

      Navarro, Mònica; Closas, Pau; Nájar Martón, Montserrat (Institute of Electrical and Electronics Engineers (IEEE), 2013)
      Text en actes de congrés
      Accés restringit per política de l'editorial
      This paper assesses the problem of localization in IR-UWB under realistic channel models for Direct Position Estimation (DPE) approaches. DPE schemes have been proposed for positioning and localization for well developed ...
    • Assessment of DME/TACAN RFI mitigation techniques in GNSS-R 

      Onrubia Ibáñez, Raúl; Querol Borràs, Jorge; Pascual Biosca, Daniel; Hyuk, Park; Alonso Arroyo, Alberto; Camps Carmona, Adriano José (Institute of Electrical and Electronics Engineers (IEEE), 2016)
      Text en actes de congrés
      Accés restringit per política de l'editorial
      Global Navigation Satellite Systems Reflectometry (GNSSR) is now being recognized as a powerfull tool for remote sensing. With the addition of new frequency bands and codes, it is possible to increase the resolution and ...
    • Assessment of satellite contacts using predictive algorithms for autonomous satellite networks 

      Ruiz De Azúa Ortega, Juan Adrián; Ramírez, Victoria; Hyuk, Park; Calveras Augé, Anna M.; Camps Carmona, Adriano José (Institute of Electrical and Electronics Engineers (IEEE), 2020-05-28)
      Article
      Accés obert
      Upcoming Low Earth Orbit Satellite Networks will provide low-latency and high downlink capacity necessary for future broadband communications and Earth Observation missions. This architecture was proposed at the beginning ...
    • Asymptotic performance analysis of successive interference cancellation with dynamic user-decoding order 

      Molina Oliveras, Francesc; Sala Álvarez, José (2020-09-01)
      Article
      Accés obert
      We address the evaluation of dynamic (estimation-based) user-decoding order in successive interference cancellation (SIC) in a proof-of-concept multiple access satellite setting in which many code-division multiple access ...
    • Atmospheric turbulence profile modeling for satellite-ground laser communication 

      Otoniel Canuet, Lucien François (Universitat Politècnica de Catalunya, 2015-07-23)
      Projecte Final de Màster Oficial
      Accés obert
      Realitzat a/amb:   Deutsches Zentrum für Luft-und Raumfahrt
      The major limitation of free-space laser communications' performances is due to atmospheric turbulence. Free-space optical channels are characterized by a set of different parameters such as the scintillation index, the ...
    • AtOx sensing using QCM for space missions 

      Tena Jiménez, Robert (Universitat Politècnica de Catalunya, 2023-07-03)
      Treball Final de Grau
      Accés restringit per acord de confidencialitat
      In various space missions, the influence of atomic oxygen (AtOx) has been detected as a harmful agent that can cause damage to satellites. In this TFG it is proposed as a solution to use Quartz Crystal Microbalances (QCM). ...
    • Attitude control for satellites flying in VLEO using aerodynamic surfaces 

      Cañas Muñoz, Valentin; González, David; Becedas, Jonathan; Rodríguez Donaire, Silvia; García-Almiñana, Daniel; Sureda Anfres, Miquel; Nieto, Miriam; Muñoz, Candia (British Interplanetary Society, 2020)
      Article
      Accés restringit per política de l'editorial
      This paper analyses the use of aerodynamic control surfaces, whether passive or active, in order to carry out very low Earth orbit (VLEO) attitude maneuver operations. Flying a satellite in a very low Earth orbit with an ...
    • Attitude determination and control system development with a low thrust propulsion system for the 3Cat-8 nano-satellite mission 

      Navarro Simoni, Pol Eduard (Universitat Politècnica de Catalunya, 2023-02-14)
      Treball Final de Grau
      Accés restringit per acord de confidencialitat
      Realitzat a/amb:   Institut d'Estudis Espacials de Catalunya
      This final degree thesis describes the development and implementation of an ADCS simulator for the 3Cat-8 mission of the UPC NanoSat Lab, which enables the calculation of the actuators and controller variables. Additionally, ...
    • Attitude determination based on image processing 

      Lemaire Lemaire, Adrien (Universitat Politècnica de Catalunya, 2022-06-21)
      Treball Final de Grau
      Accés restringit per decisió de l'autor
      Realitzat a/amb:   Université de Lille
      In this report, we will explore the way to measure the angular position of a satellite, more precisely of a CubeSat, expressed with the Euler angles. We therefore consider all the rotations that are possible in a ...
    • Attitude Determination using Quaternion-based Algorithms for 3Cat-4 

      Navarro Trastoy, Ángel (Universitat Politècnica de Catalunya, 2020-07-20)
      Projecte Final de Màster Oficial
      Accés obert
      The determination of a spacecraft’s orientation is a major problem for every mission; payloads require specific characteristics to work and engines must aim the opposite direction to were the spacecraft is meant to move. ...
    • Attitude estimation of a small satellite using a multi-objective optimization approach 

      Gambon Bru, German (Universitat Politècnica de Catalunya / Imperial College London, 2010)
      Projecte/Treball Final de Carrera
      Accés obert
      This project analyses the performance of a multi-objective optimization approach for the estimation of the rates of rotation of a small satellite, given noisy measurements of the attitude. The performance of this method ...
    • Auto-tuning of RRM parameters in UMTS networks. Feasibility study. 

      Andújar Linares, Aurora (Universitat Politècnica de Catalunya, 2007-11-22)
      Projecte Final de Màster Oficial
      Accés obert
      The present PFC is located inside the framework of the UMTS networks, and more specifically in the development of new Radio Resource Management (RRM) algorithms capable to maximize the capacity and the performance of the ...
    • Automatic ship detection in SAR satellite images: performance assessment 

      Stasolla, Mattia; Santamaría, Carlos; Mallorquí Franquet, Jordi Joan; Margarit Martín, Gerard; Walker, Nick (Institute of Electrical and Electronics Engineers (IEEE), 2015)
      Text en actes de congrés
      Accés restringit per política de l'editorial
      This paper presents the benchmarking of four ship detection systems based on satellite borne Synthetic Aperture Radar data. This research, carried out within the framework of the FP7 NEREIDS project, provides a detailed ...
    • Automation of the determination of Inertia Tensors of CubeSats using torsion pendulum period measurements 

      Gutierrez Ibarra, Jon (Universitat Politècnica de Catalunya, 2020-09-07)
      Treball Final de Grau
      Accés obert
      Contexto: Los CubeSats constituyen el estándar de satélites pequeños más extendido, prácticamente desde que fueron presentados a finales de la década de 1990. Los CubeSats revolucionaron la industria espacial. Gracias a ...