Now showing items 41-60 of 288

  • A swarm of femtosatellites for lower thermospheric density determination. 

    Lledó Ardila, Carlos (Universitat Politècnica de Catalunya, 2015-07-30)
    Master thesis
    Open Access
    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)
    Conference report
    Open Access
    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)
    Master thesis
    Open Access
    Covenantee:  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)
    Master thesis (pre-Bologna period)
    Open Access
    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 ...
  • 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 ...
  • Auto-tuning of RRM parameters in UMTS networks. Feasibility study. 

    Andújar Linares, Aurora (Universitat Politècnica de Catalunya, 2007-11-22)
    Master thesis
    Open Access
    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 ...
  • 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 ...
  • A web interface for satellite scheduling problems 

    Xhafa Xhafa, Fatos; Garcia, Carlos; Barolli, Admir; Takizawa, Makoto (Institute of Electrical and Electronics Engineers (IEEE), 2016)
    Conference report
    Open Access
    Mission planning plays an important role in satellite control systems, especially with increase of number of satellites and more complex missions to be planned. In a general setting, the satellite mission scheduling consists ...
  • 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)
    Conference lecture
    Restricted access - publisher's policy
    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 ...
  • Benchmarking over satellite scheduling problem 

    Calvo Juan, Carlos (Universitat Politècnica de Catalunya, 2012-07-23)
    Master thesis (pre-Bologna period)
    Open Access
    Covenantee:  Massachusetts Institute of Technology
    [ANGLÈS] The Earth Science Decadal Survey, organized by NASA, NPOESS and other American institutions, has proportioned an initial recommendation for the decade 2011-2020 consistent in a missions campaign taking care of 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 ...
  • Bus d'un microstaèl·lit en òrbita de la Terra 

    Borràs i Garallo, Jordi (Universitat Politècnica de Catalunya, 2006-12-20)
    Master thesis (pre-Bologna period)
    Open Access
    En aquest treball es pretén realitzar el disseny basic, o disseny de fase A, d’un microsatèl•lit per a una missió en orbita al voltant de la Terra. L’objectiu d’aquesta missió es mesurar els efectes de la radiació ionitzant ...
  • 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)
    Conference report
    Restricted access - publisher's policy
    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
    Restricted access - publisher's policy
    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 ...
  • Cancellation of scattering mechanisms in PolInSAR: application to underlying topography estimation 

    López Martínez, Carlos; Papathanassiou, Kostantinos (IEEE Press. Institute of Electrical and Electronics Engineers, 2013-02)
    Article
    Restricted access - publisher's policy
    This paper investigates the polarimetric dependence of the interferometric complex correlation and proposes amethodology for cancelling individual scattering mechanisms, in terms of the complex correlation coefficient ...
  • ³CAT-2: attitude determination and control system for a GNSS-R earth observation 6U CubeSat mission 

    Cortiella, Alexandre; Vidal, David; Jané, Jaume; Juan, Enric; Olivé, Roger; Amézaga Sarries, Adrià; Muñoz, Joan Francesc; Via, Pol; Carreno-Luengo, Hugo; Camps Carmona, Adriano José (2016-09-01)
    Article
    Open Access
    This work describes the attitude determination and control system (ADCS) of ³CAT-2, a six-unit CubeSat scheduled for launch this 2016. The ADCS of 3CAT-2 aims at controlling the satellite in orbit and fulfilling the pointing ...
  • 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 ...
  • Classification of multi-source satellite images for large scale land cover mapping 

    Juan, Enric (Universitat Politècnica de Catalunya, 2018-01)
    Master thesis
    Open Access
    Covenantee:  Centre d’Etudes Spatial de la Biosphere
    Satellite remote sensing imagery represents an attractive data source to monitor large regions with frequent updates. In this context, the operational production of accurate land cover maps plays an important role in ...
  • Co-channel interference cancelation at the user terminal in multibeam satellite systems 

    Pérez Neira, Ana Isabel; Cocco, Giuseppe; Angelone, Martina (2015-12-13)
    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 ...
  • Co-channel interference cancellation at the user terminal in multibeam satellite systems 

    Cocco, Giuseppe; Angelone, Martina; Pérez Neira, Ana Isabel (Institute of Electrical and Electronics Engineers (IEEE), 2014)
    Conference report
    Open Access
    We study the applicability of soft interference cancellation in the forward link of commercial multibeam satellite systems with focus on mobile terminals. We adopt a standard currently used in commercial satellite systems ...