Now showing items 21-40 of 130

    • Analysis of perturbations and station-keeping requirements in highly-inclined geosynchronous orbits 

      Fantino, Elena; Flores Le Roux, Roberto Maurice; Di Salvo, Alessio; Di Carlo, Marilena (2015)
      Conference report
      Open Access
      There is a demand for communications services at high latitudes that is not well served by conventional geostationary satellites. Alternatives using low-altitude orbits require too large constellations. Other options are ...
    • Análisis y caracterización del rizado "scalloping" en imágenes radar scansar y topsar 

      López Bustamante, Jordi (Universitat Politècnica de Catalunya, 2011-03-25)
      Master thesis (pre-Bologna period)
      120 months embargo
      Català: En els últims anys el nombre de missions que utilitzen radars de tipus SAR està augmentant considerablement degut a les bones prestacions que ofereixen en front de les possibles condicions climatològiques adverses. ...
    • Architectural Model for Evaluating Space Communication Networks 

      Sánchez Net, Marc (Universitat Politècnica de Catalunya / Massachusetts Institute of Technology, 2012-12)
      Master thesis (pre-Bologna period)
      Open Access
      Covenantee:   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 ...
    • 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
      Open Access
      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 ...
    • Attitude Determination Control! System Software for Nano-Satellites 

      Juan Martínez, Enric (Universitat Politècnica de Catalunya, 2015-10-26)
      Bachelor thesis
      Restricted access - confidentiality agreement
    • 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)
      Conference report
      Restricted access - publisher's policy
      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 ...
    • Avaluació de perfils de canal satèl·lit per a estratègies d'accés aleatori 

      Boixereu Vozmediano, Max (Universitat Politècnica de Catalunya, 2016-10)
      Master thesis (pre-Bologna period)
      Open Access
      The random access protocols are a key element of the communication systems when a population of potential users need to transmit small packets over a shared communication medium. One of such protocols is known as the ...
    • Benefits of using mobile ad-hoc network protocols in federated satellite systems for polar satellite missions 

      Ruiz de Azúa Ortega, Joan Adrià; Camps Carmona, Adriano José; Calveras Augé, Anna M. (Institute of Electrical and Electronics Engineers (IEEE), 2018-09-19)
      Article
      Open Access
      The Operational Network of Individual Observation Nodes (ONION) project evaluated the benefits of applying Distributed Satellite System (DSS) architectures to Earth Observation. One of its outcomes is the identification ...
    • Bistatic SAR data acquisition and processing using SABRINA-X, with TerraSAR-X as the opportunity transmitter 

      Siddique, Muhammad Adnan (Universitat Politècnica de Catalunya, 2010-07)
      Master thesis
      Open Access
      This thesis investigates the acquisition and processing of Bistatic SAR data using SABRINA-X, and with TerraSAR-X as the transmitter of opportunity. SABRINA-X is an X-band receiver system that has been recently designed ...
    • Blind Algorithms Characterization in Telecommunications context 

      Piñol Bunthama, Jonatan (Universitat Politècnica de Catalunya, 2014-09-24)
      Master thesis (pre-Bologna period)
      Restricted access - confidentiality agreement
    • Characterization of the effects of multi-tap filtering on FBMC/OQAM systems 

      Caus, Marius; Pérez Neira, Ana Isabel; Kliks, Adrian (HINDAWI, 2014-06-05)
      Article
      Open Access
      The filter bank multicarrier modulation based on offset quadrature amplitude modulation (FBMC/OQAM) is being considered as an eligible technology for future wireless communications. However, the orthogonality may be destroyed ...
    • Co-channel interference cancelation at the user terminal in multibeam satellite systems 

      Pérez Neira, Ana Isabel; Cocco, Giuseppe; Angelone, Martina (2017-01-01)
      Article
      Open Access
      We study the applicability of soft interference cancelation in the forward link of multibeam satellite systems with focus on mobile terminals. We adopt a standard currently used in commercial satellite systems as a ...
    • Collective unambiguous positioning with high-order BOC signals 

      García Molina, J. A.; Fernández Rubio, Juan Antonio (2018-01-01)
      Article
      Open Access
      The unambiguous estimation of high-order BOC signals in harsh propagation conditions is still an open problem in the literature. This paper proposes to overcome the limitations observed in state-of-the-art unambiguous ...
    • Comparativa del rendimiento de variantes del protocolo TCP en satélites geoestacionarios 

      Martínez Álvarez, Andrés (Universitat Politècnica de Catalunya, 2016-07-12)
      Master thesis (pre-Bologna period)
      Open Access
      Communication networks have experienced a dramatic growth in the past two decades. The number of devices connected to the Internet has been growing exponentially. If TCP congestion control algorithm was not present, network ...
    • Conformación de haz con señal de test como referencia temporal 

      Corbera Busquets, Lourdes; Lagunas Hernandez, Miguel A. (1991)
      Conference report
      Open Access
      This paper presents a procedure for CIR beamforming that avoids SVD-like procedures, and is derivad from !he classic CINR solution. The resulting nulls along the direction of the impinging interferers, are of the sama ...
    • Constraints on LISA pathfinder's self-gravity: design requirements, estimates and testing procedures 

      Armano, M.; Audley, H.; Auger, G.; Baird, J.; Binetruy, P.; Born, M.; Bortoluzzi, D.; Brandt, N.; Bursi, A.; Caleno, M.; Cavalleri, A.; Cesarini, A.; Cruise, M.; Danzmann, K.; Ramos Castro, Juan José (2016-11-08)
      Article
      Open Access
      LISA Pathfinder satellite was launched on 3 December 2015 toward the Sun–Earth first Lagrangian point (L1) where the LISA Technology Package (LTP), which is the main science payload, will be tested. LTP achieves measurements ...
    • Contributions to ITACA: A tool to architect space communication networks 

      Portillo Barrios, íñigo Del (Universitat Politècnica de Catalunya, 2014-12-11)
      Master thesis (pre-Bologna period)
      Open Access
      Covenantee:   Massachusetts Institute of Technology
      [ANGLÈS] Communication and Navigation services are critical for any space mission. Nowadays, NASA provides services to its customers by using a triple network composed of the Near Earth Network (NEN), the Deep Space Network ...
    • CubeCat-1: Communications System of a Nano-satellite 

      Karki, Sumit (Universitat Politècnica de Catalunya, 2013-07-30)
      Master thesis
      Open Access
      [ANGLÈS] The CubeSat program provides a cost-effective solution to the educational institutions and private firms, around the world, willing to put their satellites in orbit, which are no bigger than a 10 cm cube, and weigh ...
    • DC/DC Converter Family development for Spacecraft Communications reception equipment 

      Albiol Dalmau, Miquel (Universitat Politècnica de Catalunya, 2013-09-16)
      Master thesis (pre-Bologna period)
      Restricted access - author's decision
      Covenantee:   Mier Comunicaciones
      [ANGLÈS] The work behind this thesis has consisted on the development of a small family of DC/DC converters to supply radiofrequency equipment in space applications. Overall activity started mid-2009 and keeps ongoing as ...
    • Design and implementation of the communications system of Nanosatellites 

      Muñoz Martin, Joan Francesc (Universitat Politècnica de Catalunya, 2015-02-16)
      Bachelor thesis
      Restricted access - confidentiality agreement