Exploració per tema "Artificial satellites in navigation"
Ara es mostren els items 41-60 de 70
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Modelling forest decline using SMOS soil moisture and vegetation optical depth
(Institute of Electrical and Electronics Engineers (IEEE), 2018)
Text en actes de congrés
Accés restringit per política de l'editorialGlobal change is increasing the risk of forest decline worldwide, impacting carbon and water cycles. Hence, there is an urgent need for predicting forest decline occurrence. To that purpose, this study links forest decline ... -
Multi Antenna Time of Arrival Estimation
(Universitat Politècnica de Catalunya, 2011-07-21)
Projecte/Treball Final de Carrera
Accés obert
Realitzat a/amb: Kungliga Tekniska högskolanEnglish: In the communications literature exist many documents that explain how to use spatial diversity to improve the performance of the system. However, the use of spatial diversity has not been studied in depth for ... -
Navegació i maniobres aèries molt acurades amb GNSS
(Universitat Politècnica de Catalunya, 2022-09-26)
Projecte Final de Màster Oficial
Accés restringit per decisió de l'autorEl projecte descrit en aquest document es centra en el posicionament de precisió a partir de les mesures de fase dels senyals provinents dels satel·lits GNSS (Global Navigation Satellite System). A partir d’un receptor ... -
Network-based ionospheric gradient monitoring to support GBAS
(2021-02-11)
Article
Accés obertLarge ionospheric gradients acting between a Ground Based Augmentation System (GBAS) reference station and an aircraft on approach could lead to hazardous position errors if undetected. Current GBAS stations provide solutions ... -
Network-based ionospheric gradient monitoring to support GBAS
(ION Publications (The Institute of navigation), 2019)
Text en actes de congrés
Accés obertIonospheric anomalies, like large ionospheric gradients, might produce a difference between the ionospheric error experienced bythe Ground Based Augmentation System (GBAS) reference station and the aircraft on approach. ... -
New real-time GNSS algorithms for detection and measurement of potential geoeffective stellar flares
(Universitat Politècnica de Catalunya, 2019-07-05)
Treball Final de Grau
Accés obertLas fulguraciones estelares son incrementos repentinos de radiaciones electromagnéticas en la superficie de una estrella que contienen gran cantidad de energía. Son detectadas por telescopios tales como Swift o Fermi ... -
Non-orthogonal transmission techniques for multibeam satellite systems
(2019-12-01)
Article
Accés obertNon-orthogonal transmission is a promising technology enabler to meet the requirements of 5G communication systems. Seminal papers demonstrated that non-orthogonal multiplexing techniques outperform orthogonal schemes in ... -
Ocean target monitoring with improved revisit time using constellations of GNSS-R instruments
(Institute of Electrical and Electronics Engineers (IEEE), 2017)
Text en actes de congrés
Accés restringit per política de l'editorialShips and ice monitoring is of key importance in numerous applications, such as maritime traffic control, prevention of illegal activities, climate change studies, and maritime security. In this work, the feasibility of ... -
On fairness optimization for NOMA-enabled multi-beam satellite systems
(Institute of Electrical and Electronics Engineers (IEEE), 2019)
Text en actes de congrés
Accés obertIn a multi-beam satellite communication system, traffic requests are typically asymmetric across beams and highly heterogeneous among terminals. In practical operations, it is important to achieve a good match between the ... -
On the physical layer security of IoT devices over satellite
(Institute of Electrical and Electronics Engineers (IEEE), 2019)
Text en actes de congrés
Accés obertThe security in satellite communications is a key issue due to the large footprint of the beams. This is specially critical in IoT devices that transmit data directly to satellite. Take into account that IoT devices are ... -
Optimized model-based design space exploration of distributed multi-orbit multi-platform Earth observation spacecraft architectures
(Institute of Electrical and Electronics Engineers (IEEE), 2018)
Text en actes de congrés
Accés restringit per política de l'editorialSatellite architectures where networked, heterogeneous observation nodes capture data in a distributed manner are seen as feasible solutions to address the needs of next-generation Earth observation services (i.e. higher ... -
Overview of the Cassini Processing Altimetric Data System
(Universitat Politècnica de Catalunya, 2008)
Projecte/Treball Final de Carrera
Accés obertAlthough the Cassini-Huygens interplanetary mission is a project that covers Saturn, its rings and most of its multiple satellites, in this introduction attention will be focused mainly in the biggest moon of Saturn: ... -
Positioning and timing in the MIMO-gnss framework
(Institute of Electrical and Electronics Engineers (IEEE), 2019)
Text en actes de congrés
Accés restringit per política de l'editorialThis paper discusses about GNSS-based positioning and timing in challenging propagation conditions for receivers featuring an array of antennas with an arbitrary distribution. In particular, the positioning and timing ... -
Practical security considerations for IoT systems over satellite
(Ka and Broadband Communications, Navigation and Earth Observation Conference, 2019)
Text en actes de congrés
Accés obertCurrently, the forecast for the European market for IoT is a yearly 19.8% increase up to reach $241 billion in 2025. Thisstrong growing will be concentrated in verticals from manufacturing, utilities, retail and transportation ... -
Proof-of-concept of a federated satellite system between two 6-unit cubeSats for distributed earth observation satellite systems
(2019)
Comunicació de congrés
Accés restringit per política de l'editorialDuring these years, novel Distributed Satellite Systems (DSS) have addressed the new Earth Observation (EO) requirements (e.g. near-real time access to data, or multi-point observations). One of the DSS proposals is the ... -
Real-Time Robust Loosely-Coupled GPS-Aided PDR
(Universitat Politècnica de Catalunya, 2015-08)
Projecte/Treball Final de Carrera
Accés obert
Realitzat a/amb: Kungliga Tekniska högskolanFusion between inertial navigation systems (INS) and satellite-based sys- tems like GPS are often used to enhance the overall position or navigation solution. The satellite-based systems are capable of correcting the drift ... -
Recomanacions disseny, observació i càlcul de xarxes geodèsiques GNSS
(Universitat Politècnica de Catalunya, 2014-12)
Projecte/Treball Final de Carrera
Accés obertPer a la implantació o densificació d’una xarxa geodèsia cal disposar d’unes directrius de treball i actualment a Catalunya no existeix una normativa pública i publicada d’aquesta branca de la topografia. Analitzant les ... -
Removing day-boundary discontinuities on GNSS clock estimates: methodology and results
(2021-04)
Article
Accés obertGlobal navigation satellite system (GNSS) satellites are equipped with very stable atomic clocks that can be used for assess-ing the models and strategies involved in the estimation processes, where the clock estimates ... -
Scheduler design for a satellite simulator and other software improvements
(Universitat Politècnica de Catalunya, 2019-07-08)
Treball Final de Grau
Accés obertThe main objective of this work is contributing into the development of one satellite missions’ simulator. Specifically, the main part to work in is the scheduler, the task manager that decides how the simulator must ... -
Sensitivity to Soil Moisture and Observation Geometry of Spaceborne GNSS-R Delay-Doppler Maps
(2019)
Comunicació de congrés
Accés obertThanks to the successful operations of the UK TDS-1 and NASA CYGNSS GNSS-R missions, a wealth of Delay-Doppler Maps (DDM) are being measured from the ocean, but also from land reflections. Using the land reflected DDM, ...
