Exploració per tema "Global Positioning System"

Ara es mostren els items 1-20 de 481

    • 3CAT-2, an experimental nano-satellite for GNSS-R earth observation: mission concept and analysis 

      Carreno-Luengo, Hugo; Camps Carmona, Adriano José; Muñoz, Joan Francesc; Vidal, David; Amézaga Sarries, Adrià; Bolet Alberto, Font; Jané, Jaume; Olivé, Roger; Carola, Jorge; Catarino, Nuno; Hagenfeldt, Miguel; Palomo, Pedro; Cornara, Stefania (2016-10-01)
      Article
      Accés obert
      Global navigation satellite system reflectometry is a multistatic radar using navigation signals as signals of opportunity. It provides wide-swath and improved spatiotemporal sampling over current space-borne missions. The ...

    • 3CAT-2: a 6U CibeSat-based multi-constellation, dual-polarization, and dual-frequency GNSS-RO experimental mission 

      Carreño Luengo, Hugo; Amézaga Sarries, Adrià; Bolet, Albert; Vidal Mateu, David; Jané, Jaume; Muñoz Martin, Joan Francesc; Olivé Muñiz, Roger; Camps Carmona, Adriano José; Carola, Jorge; Catarino, Nuno; Hagenfeldt, Miguel; Palomo, Pedro; Cornara, Stefania (2015)
      Text en actes de congrés
      Accés restringit per política de l'editorial
      Cat-2 Assembly, Integration and Verification (AIV) activities of the Engineering Model (EM) and the Flight Model (FM) are being carried out at present. The Attitude Determination and Control System (ADCS) and Flight ...

    • 3Cat-3/MOTS nanosatellite mission for optical multispectral and GNSS-R Earth Observation: concept and analysis 

      Castellví Esturi, Jordi; Camps Carmona, Adriano José; Corbera Fauria, Jordi; Alamús, Ramón (Multidisciplinary Digital Publishing Institute (MDPI), 2018-01-06)
      Article
      Accés obert
      The 3Cat-3/MOTS (3: Cube, Cat: Catalunya, 3: 3rd CubeSat mission/Missió Observació Terra Satèl·lit) mission is a joint initiative between the Institut Cartogràfic i Geològic de Catalunya (ICGC) and the Universitat Politècnica ...

    • 3D FEM model of ground deformation in Deception Island (Antarctica) 

      Garrido Ballart, Sònia (Universitat Politècnica de Catalunya, 2017-06-16)
      Projecte Final de Màster Oficial
      Accés obert
      Realitzat a/amb:   Institut de Ciències de la Terra Jaume Almera
      Ground deformation has been demonstrated to be one of the most common signals of volcanic unrest. A variety of processes can cause ground deformation in active volcanic areas (e.g. magmatic processes, pore pressure ...

    • A context-aware model to provide positioning in disaster relief scenarios 

      Moreno, Daniel; Ochoa, Sergio; Meseguer Pallarès, Roc (2015-10-01)
      Article
      Accés obert
      The effectiveness of the work performed during disaster relief efforts is highly dependent on the coordination of activities conducted by the first responders deployed in the affected area. Such coordination, in turn, ...

    • A direct method to estimate atmospheric phase delay for insar with global atmospheric models 

      Hu, Zhongbo; Mallorquí Franquet, Jordi Joan (Institute of Electrical and Electronics Engineers (IEEE), 2018)
      Comunicació de congrés
      Accés restringit per política de l'editorial
      Differential Interferometric Synthetic Aperture Radar (DInSAR) has proved its unprecedented advantages of monitoring ground deformation on large scale with centimeter to millimeter precision in the last two decades. However, ...

    • A field study on satellite and cellular 

      Gete-Alonso Roldán, Óscar; Martín Escalona, Israel; Barceló Arroyo, Francisco (IEEE Press. Institute of Electrical and Electronics Engineers, 2010)
      Text en actes de congrés
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      This article presents a statistical study on the availability of location sources. In particular, it rates the availability of cellular network base stations and GPS satellites in urban scenarios. Individual and joint ...

    • 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
      Accés obert
      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 generic simulator for aperture synthesis radiometers: Radiative transfer module and end-to-end tests 

      Camps Carmona, Adriano José; Hyuk, Park; Barbosa, José; Bandeiras, J.; Sousa, Ana; d'Addio, Salvatore; Martín Neira, Manuel (Institute of Electrical and Electronics Engineers (IEEE), 2014)
      Comunicació de congrés
      Accés restringit per política de l'editorial
      The Synthetic Aperture Interferometric Radiometer (SAIR) Performance Simulator (SAIRPS) is a very versatile software tool developed by Deimos Engenharia (Portugal) and the Universitat Politècnica de Catalunya-Barcelona ...

    • A Kinematic campaign to evaluate EGNOS 1046 maritime service 

      Ibáñez Segura, Deimos; Rovira Garcia, Adrià; Sanz Subirana, Jaume; Juan Zornoza, José Miguel; González Casado, Guillermo; Alonso Alonso, María Teresa; López-Salcedo, José Antonio; Jia, Huamin; Pancorbo, Fransico Javier; García, Carlos; Martín, Irene; Abadía, Santos Rodrigo (ION Publications (The Institute of navigation), 2019)
      Text en actes de congrés
      Accés obert
      Global Navigation Satellite Systems (GNSSs) have improved the efficiency and accuracy of transportation means. In terms of safety, the European Geostationary Navigation Overlay System (EGNOS) is providing vertical and ...

    • A method for scintillation characterization using geodetic receivers operating at 1 Hz 

      Juan Zornoza, José Miguel; Aragón Ángel, Maria Angeles; Sanz Subirana, Jaume; González Casado, Guillermo; Rovira Garcia, Adrià (2017-05-08)
      Article
      Accés obert
      Ionospheric scintillation produces strong disruptive effects on global navigation satellite system (GNSS) signals, ranging from degrading performances to rendering these signals useless for accurate navigation. The current ...

    • A methodology to assess ionospheric models for GNSS 

      Rovira Garcia, Adrià; Juan Zornoza, José Miguel; Sanz Subirana, Jaume; González Casado, Guillermo; Ibáñez Segura, Deimos (2015)
      Comunicació de congrés
      Accés restringit per política de l'editorial

    • A multi-frequency method to improve the long-term estimation of GNSS clock corrections and phase biases 

      Rovira Garcia, Adrià; Juan Zornoza, José Miguel; Sanz Subirana, Jaume; González Casado, Guillermo; Ventura Traveset, Javier; Cacciapuoti, Luigi; Schoenemann, Erik (2021-12)
      Article
      Accés obert
      The space segment of the Global Navigation Satellite System (GNSS) is equipped with highly stable atomic clocks. In order to use these clocks as references, their time offsets must be estimated from ground measurements as ...

    • A new approach to gross error detection for GPS networks 

      Dalfó Simó, Cristina; Fiol Mora, Miquel Àngel (2019-05-29)
      Article
      Accés obert
      We present a new matrix-based approach to detect and correct gross errors in GPS geodetic control networks. The study is carried out by introducing a new matrix, whose entries are powers of a (real or complex) variable, ...

    • 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)
      Text en actes de congrés
      Accés restringit per política de l'editorial
      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 nonparametric statistical model for the selection of significant variables acting in the deterioration of built façades 

      Serrat Piè, Carles; Gibert Armengol, Vicente; Casas Rius, Joan Ramon; Rapinski, Jacek (International Centre for Numerical Methods in Engineering (CIMNE), 2020)
      Text en actes de congrés
      Accés obert
      Serrat and Gibert (2011) introduced the use of survival analysis techniques for the study of time-to-failure in the facades of a building stock. Those techniques have been implemented in a predictive system that incorporates ...

    • A numerical simulator to evaluate the electromagnetic bias in GNSS-R altimetry 

      Ghavidel, Ali; Schiavulli, Domenico; Camps Carmona, Adriano José (Institute of Electrical and Electronics Engineers (IEEE), 2014)
      Comunicació de congrés
      Accés restringit per política de l'editorial
      This paper presents the computed electromagnetic (EM) bias predicted for GNSS-R altimetry systems. First, a synthetic time-evolving sea surface is generated satisfying an ocean surface height spectrum. Then, a direct GNSS ...

    • 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 ...

    • A real-time world-wide ionospheric model for single and multi-frequency precise navigation 

      Rovira Garcia, Adrià; Juan Zornoza, José Miguel; Sanz Subirana, Jaume (The Institute of Navigation, 2014)
      Comunicació de congrés
      Accés restringit per política de l'editorial
      The ionosphere plays an important role in satellite-based navigation, either in standard navigation, with single frequency mass-market receivers, or in precise navigation, with dual frequency receivers. In this work, the ...

    • A review of higher order ionospheric refraction effects on dual frequency GPS 

      Petrie, Elisabeth J.; Hernández Pajares, Manuel; Spalla, Paolo; Moore, Philip; King, Matt A. (2010-11-26)
      Article
      Accés restringit per política de l'editorial
      Abstract Higher order ionospheric effects are increasingly relevant as precision requirements on GPS data and products increase. The refractive index of the ionosphere is affected by its electron content and the magnetic ...