Browsing by Subject "Satellites"

Now showing items 1-20 of 93

    • A contour matching approach for accurate NOAA-AVHRR image navigation 

      Eugenio, F; Marqués Acosta, Fernando; Suarez, E; Rovaris, E (Eurasip, 2000)
      Conference report
      Open Access
      Although different methods for NOAA AVHRR image navigation have already been established, the multitemporal and multi-satellite character of most studies requires automatic and accurate methods for navigation of satellite ...

    • A generic level 1 simulator for spaceborne GNSS-R missions and application to GEROS-ISS ocean reflectometry 

      Hyuk, Park; Camps Carmona, Adriano José; Pascual Biosca, Daniel; Kang, Yujin; Onrubia Ibáñez, Raúl; Querol Borràs, Jorge; Alonso Arroyo, Alberto (2017-07-18)
      Article
      Open Access
      In the past decade Global Navigation Satellites System Reflectometry (GNSS-R) has emerged as a new technique for earth remote sensing for various applications, such as ocean altimetry and sea state monitoring. After the ...

    • A new approach to improve satellite clock estimates, removing the inter-day jumps 

      Juan Zornoza, José Miguel; Sanz Subirana, Jaume; Rovira Garcia, Adrià; González Casado, Guillermo; Ventura Traveset, Javier; Cacciapuoti, Luigi; Schoenemann, Erik (2020)
      Conference report
      Restricted access - publisher's policy
      Time synchronization is one of the main applications of Global Navigation Satellite System (GNSS). Indeed, GNSS satellites are equipped with highly stable atomic clocks, which can be used as clock references. In particular, ...

    • A stroboscopic control for the confinement of swarms in a spherical domain around the Earth 

      García Taberner, Laura; Masdemont Soler, Josep (2017)
      Conference report
      Restricted access - publisher's policy
      Swarms of spacecraft are an idea that has been growing in interest in the last few years. This work focuses on the strategies and costs for the maintenance of a swarm of a large number of spacecraft in a close neighborhood ...

    • 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 ...

    • Advanced Interferometer development for precise geostationary satellite tracking 

      Albert Galí, Miquel; Broquetas Ibars, Antoni (Universitat Politècnica de Catalunya, 2021-02-10)
      Bachelor thesis
      Restricted access - confidentiality agreement

    • Agrupación plana alimentada por linea de sustrato suspendido 

      Torrents Dolz, Josep M.; Romeu Robert, Jordi; Jofre Roca, Lluís (1989)
      Conference report
      Open Access
      The purpose of this design is a new type of planar antenna with hi gh-efficency and large-bandwidth requirements of TVRO. A low loss suspended substrate line (SSL ) has been developed and optimisated for feed network.

    • Analysis of ionospheric scintillation in GNSS signals 

      Tortajada Ropero, Lorena (Universitat Politècnica de Catalunya, 2021-06-22)
      Master thesis
      Open Access
      Scintillation is a particular type of space weather disturbance that currently limits the accuracy and availability of the Global Navigation Satellite System. The present final master’s thesis aims to study the characteristics ...

    • Analysis of the relative dynamics of a charged spacecraft moving under the influence of a magnetic field 

      Cheng, Yu; Gómez Muntané, Gerard; Masdemont Soler, Josep; Yuan, Jianping (2018-09-01)
      Article
      Open Access
      We analyse a dynamical scenario where a constantly charged spacecraft (follower) moves in the vicinity of another one (leader) that follows a circular Keplerian orbit around the Earth and generates a rotating magnetic ...

    • Anomalies study in VTEC from SMOS data 

      Roura Garcés, Sergi (Universitat Politècnica de Catalunya, 2023-07-06)
      Bachelor thesis
      Open Access
      The main goal is to analyze the SMOS measurements and determine if there is any sign on them that could determine the possible effects of these natural phenomena on the ionosphere.

    • 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 ...

    • 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)
      Conference report
      Restricted access - publisher's policy
      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 ...

    • 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 ...

    • Contributions to satellite subsystem models and communications link emulation 

      Romero Aguirre, Antonio (Universitat Politècnica de Catalunya, 2022-07-06)
      Bachelor thesis
      Open Access
      During last years, space missions have evolved from monolithic spacecrafts architectures, to distributed ones, which are known as Distribute Satellite Systems (DSS). This spacecraft architecture has changed the space ...

    • Cooperative dual Leo satellite transmission in multi-user OTFS systems 

      Caus López, Màrius; Shaat, Musbah; Pérez Neira, Ana Isabel; Schellmann, Malte; Cao, Hanwen (Institute of Electrical and Electronics Engineers (IEEE), 2023)
      Conference report
      Open Access
      This paper explores multi-satellite transmission schemes. The focus is on the multi-user downlink scenario, where two low Earth orbit satellites transmit data cooperatively, which are then combined at each of the ground ...

    • 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)
      Conference report
      Restricted access - publisher's policy
      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
      Open Access
      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 ...

    • Deep learning for experimental hybrid terrestrial and satellite interference management 

      Henarejos, Pol; Vázquez Oliver, Miguel Ángel; Pérez Neira, Ana Isabel (Institute of Electrical and Electronics Engineers (IEEE), 2019)
      Conference report
      Restricted access - publisher's policy
      Interference Management is a vast topic present in many disciplines. The majority of wireless standards suffer the drawback of interference intrusion and the network efficiency drop due to that. Traditionally, interference ...

    • Deployment mechanism for a L-band helix antenna in 1-Unit Cubesat 

      Fernandez Capon, Lara Pilar; Sobrino Hidalgo, Marco; Milian, Oriol; Aguilella, Andrea; Solanellas Bofarull, Arnau; Badia Ballús, Marc; Muñoz Martin, Joan Francesc; Ruiz De Azúa Ortega, Juan Adrián; Sureda Anfres, Miquel; Camps Carmona, Adriano José (2020-09-08)
      Article
      Open Access
      Recently, there is a renewed interest in Earth Observation (EO) of the cryosphere as a proxy of global warming, soil moisture for agriculture and desertification studies, and biomass for carbon storage. Global Navigation ...

    • Desarrollo de algoritmo de predicción de riesgo de incendios a nivel europeo 

      Castela Espinha, Afonso (Universitat Politècnica de Catalunya, 2019-07-25)
      Master thesis
      Open Access