Ara es mostren els items 21-40 de 274

  • A multi-agent payload management approach for femtosatellite applications 

    Navarro Morales, Lara (Universitat Politècnica de Catalunya, 2011-09-21)
    Projecte Final de Màster Oficial
    Accés obert
    The reduction in size of electronic components makes feasible really small satellites like Femtosatellites with are less than 100 grams of mass. The main advantage of this kind of satellite is the multipoint of view when ...
  • Analysis of techniques for traffic optimization over satellite backhauling links 

    González Polo, Alvaro (Universitat Politècnica de Catalunya, 2013-10-21)
    Projecte/Treball Final de Carrera
    Accés obert
    [ANGLÈS] In certain situations the operation of mobile operator infrastructure can be affected by natural disasters such as hurricanes, fires or earthquakes. This fact hinders optimum coordination of rescue actions and ...
  • Analysis of urban and vegetation growing in NW Senegal during the last 25 years using medium resolution imagery 

    Marcello, Javier; Calderero Patino, Felipe; Eugenio, Francisco; Marqués Acosta, Fernando (Institute of Electrical and Electronics Engineers (IEEE), 2014)
    Text en actes de congrés
    Accés restringit per política de l'editorial
    Land use and land cover information are key information for Governments in developing countries. In this context, remote sensing satellites like Landsat or SPOT can provide valuable data covering several decades. We have ...
  • An efficient implementation of the FAPEC compression algorithm in the CCSDS image standard 

    Artigues Aguiló, Gabriel (Universitat Politècnica de Catalunya, 2012-06-26)
    Projecte/Treball Final de Carrera
    Accés obert
    [ANGLÈS] The implementation of an efficient image compressor using the FAPEC coder in the CCSDS image data compression standard (122.0).
  • A new design of high precision solar microsensor for satellite aplications 

    Delgado, Francisco; Ortega Villasclaras, Pablo Rafael; Lopez Tarrida, Cristina; Garcia Ortega, Juan; Angulo, Manuel; Quero Reboul, Jose Manuel (IEEE, 2010)
    Text en actes de congrés
    Accés restringit per política de l'editorial
    This paper shows the design and calibration of an improved miniaturized two-axis sun sensor for satellite attitude control. The proposed new structure is based on a previous sun sensor structure by adding multiple sensing ...
  • An IBC solar cell for the UPC CubeSat-1 mission 

    Ortega Villasclaras, Pablo Rafael; Jové Casulleras, Roger; Pedret, A; Gonzalvez, G.; López Rodríguez, Gema; Martín García, Isidro; Domínguez Pumar, Manuel; Alcubilla González, Ramón; Camps Carmona, Adriano José (Institute of Electrical and Electronics Engineers (IEEE), 2013)
    Text en actes de congrés
    Accés restringit per política de l'editorial
    In this work the fabrication and electrical characterization of interdigitated back contact IBC solar cells is shown. These solar cells have been specifically designed for a CubeSat based satellite under developement at ...
  • An innovative interference mitigation approach for high throughput satellite systems 

    Caus, Marius; Pérez Neira, Ana Isabel; Angelone, Martina; Ginesi, Alberto (Institute of Electrical and Electronics Engineers (IEEE), 2013)
    Text en actes de congrés
    Accés restringit per política de l'editorial
    This paper investigates how to boost the forward link capacity in multibeam satellite systems. Since co-channel interference is the main inhibitor to achieve the full potential of frequency reuse, we propose to mitigate ...
  • Antenna Modeller for Synthetic Aperture Radar Applications. Electromagnetic and Radiometric Considerations 

    Calafell Rueda, Irene (Universitat Politècnica de Catalunya, 2011-02-17)
    Projecte Final de Màster Oficial
    Accés obert
    The objective of the present Master Thesis is designing an optimizer of the excitation coefficients of a phased array antenna.
  • Aplicació Android de suport i ajuda a la gent gran 

    Soler Subirà, Josep Maria (Universitat Politècnica de Catalunya, 2015-06)
    Treball Final de Grau
    Accés obert
    The Information and Communication Technology (ICT) group elements and techniques used in the processing and transmission of information, mainly computer, internet and telecommunications. Today people are increasingly ...
  • Applying autonomy to distributed satellite systems: Trends, challenges, and future prospects 

    Araguz López, Carles; Bou Balust, Elisenda; Alarcón Cot, Eduardo José (2018-03-26)
    Article
    Accés restringit per política de l'editorial
    While monolithic satellite missions still pose significant advantages in terms of accuracy and operations, novel distributed architectures are promising improved flexibility, responsiveness, and adaptability to structural ...
  • A radio-frequency interference detector for GNSS navigation and GNSS-reflectometry applications 

    Querol Borràs, Jorge; Onrubia Ibáñez, Raúl; Pascual Biosca, Daniel; Hyuk, Park; Camps Carmona, Adriano José (Institute of Electrical and Electronics Engineers (IEEE), 2017)
    Text en actes de congrés
    Accés restringit per política de l'editorial
    Radio-Frequency Interference (RFI) is a growing problem for applications based on the Global Navigation Satellite Systems (GNSS), including Earth observation using GNSS - Reflectometry (GNSS-R). Nowadays, many efforts are ...
  • Architectural Model for Evaluating Space Communication Networks 

    Sánchez Net, Marc (Universitat Politècnica de Catalunya / Massachusetts Institute of Technology, 2012-12)
    Projecte/Treball Final de Carrera
    Accés obert
    Realitzat a/amb:  Massachusetts Institute of Technology
    [ANGLÈS] The space exploration endeavor started in 1957 with the launch and operation of the first manmade satellite, the URSS Sputnik 1. Since then, multiple space programs have been developed, pushing the limits of ...
  • A scalable distributed autonomy system for fractionated satellite missions 

    Rodrigo Muñoz, Santiago (Universitat Politècnica de Catalunya, 2016-02-11)
    Treball Final de Grau
    Accés obert
    Current trends in space systems are towards the design of autonomous spacecraft that are capable to generate their own plans of action based on system constraints, on-board data analysis and mission goals set by ground ...
  • 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
  • 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 ...
  • A swarm of femtosatellites for lower thermospheric density determination. 

    Lledó Ardila, Carlos (Universitat Politècnica de Catalunya, 2015-07-30)
    Projecte Final de Màster Oficial
    Accés obert
    The Lower thermosphere (between 80 and 350 km) is quite badly known due to the scarcity of satellites in this region. Nevertheless, it is an important region in several respects. Firstly, because its density determines ...
  • A Tabu Search algorithm for ground station scheduling problem 

    Xhafa Xhafa, Fatos; Herrero Garcia, Xavier; Barolli, Admir; Takizawa, Makoto (2014)
    Text en actes de congrés
    Accés obert
    Mission planning plays an important role in satellite control systems. Satellites are not autonomously operated in many cases but are controlled by tele-commands transmitted from ground stations. Therefore, mission scheduling ...
  • 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 ...
  • 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 ...