Global ETD Search
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Showing 1 to 20 of 32 for “"global navigation satellite systems"”.
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A subsampling delta-sigma modulator for global navigation satellite systems
Next-generation Global Navigation Satellite Systems (GNSS) receivers should be capable of processing multi-frequency signals in order to provide better positioning accuracy and signal availability to end-user. Nevertheless, the realization of such receivers with conventional receiver architectures …
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Global Navigation Satellite Systems as Signals of Opportunity for Environmental Applications: Reflectometry and Scintillation
L'abstract è presente nell'allegato / the abstract is in the attachment
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Using Random Sampling Consensus (RANSAC) to Detect Errors in Global Navigation Satellite Systems (GNSS) Signals and Data
A positioning, navigation, and timing (PNT) signal can be used to estimate a user's position at an identified time. A global navigation satellite system (GNSS) uses the PNT signal to provide satellite-based navigation. Advanced receivers can track multiple GNSS constellations simultaneously. In …
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Using an empirical model of human turning motion to aid heading estimation in a personal navigation system
With the adoption of Global Navigation Satellite Systems in smart phones, soldier equipment, and emergency responder navigation systems users have realized the usefulness of low cost Personal Navigation Systems. The state-of-the-art Personal Navigation System is a unit that fuses information based …
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An Investigation of magnetic storm effects on total electron content over South Africa for selected periods in solar cycles 23 and 24
… to space weather activities on both local and global scales. In the past several decades, the International Global Navigation Satellite Systems Service (GNSS) networks of dual frequency receiver data have been applied to develop global and regional models of ionospheric TEC. These models were …
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Using a co-located GNSS radio occultation payload for microwave radiometer calibration
… radio occultation (RO) instrument with Global Navigation Satellite Systems (GNSS). The radiometer and RO receiver periodically observe the same volume of atmosphere near the earth's limb, allowing for overlapping, or collocated, measurements that can be used to calibrate the radiometer. …
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Joint Localization and Synchronization via User Cooperation in Non-Terrestrial Networks
… networks (NTN) with low Earth orbit (LEO) satellites offer a promising alternative for positioning, navigation, and timing (PNT) by providing diversity and increasing the signal-to-noise ratio (SNR) over global navigation satellite systems (GNSS). However, the primary challenge in NTNbased …
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Enhancing Coastal Community Resilience in North Carolina: Monitoring Erosion and Nature-based Solution Efficacy on a Fetch-limited Barrier Island
… alongside survey-grade Real-Time Kinematic Global Navigation Satellite Systems (RTK-GNSS) and use innovative geospatial workflows to quantify seasonal erosion. Our results show: 1) consistent erosion during active and dormant marine weather seasons and 2) overall accretion once all …
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Improving Bluetooth-based Indoor Positioning Using Vision and Artificial Networks
The demands for accurate positioning and navigation applications in complex indoor environments such as emergency call positioning, fire-fighting services, and rescue operations are increasing continuously. Global Navigation Satellite Systems (GNSS) receivers, while ubiquitous in outdoor …
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Drone Navigation in Polar and Cryospheric Regions
… The study aims to provide insights into the navigation accuracy of Global Navigation Satellite Systems (GNSSs) use for drones, and the accuracy levels of drone positioning data achieved by GNSS augmentation. Currently, drone use in the global polar and cryospheric community is limited, and …
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Artificial Neural Networks and Map-Matching for GPS Navigation
Global navigation satellite systems (GNSS), such as the Global Positioning System (GPS) have been increasingly used in navigation and tracking of vehicles. Using GPS, certain positioning errors and limitations, such as multipath effects and the geometric position of the satellites (DOP) or signal …
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Design and theoretical analysis of advanced power based positioning in RF system
… requirement for many applications. The global navigation satellite systems (GNSS) is widely used. But its accuracy suffers from signal obstruction by buildings, multipath fading, and disruption due to jamming and spoof. Hence, it is required to supplement GPS with inertial sensors and …
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Terrain aware tactical motion planning and control algorithms for off-road UGVs in GNSS denied hostile environments
… ground vehicles operating in environments where global navigation satellite systems are unavailable due to adversarial interference or structural constraints. The research focuses on enabling autonomous navigation in uncharted, hostile terrains by developing a hierarchical autonomy stack that …
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Exploiting Signals of Opportunity for High-Precision PNT: Optimized Bayesian Estimation Across 5G and LEO Networks
… demands continuous, high-precision positioning, navigation, and timing (PNT) systems. While traditional global navigation satellite systems (GNSS) degrade severely in deep urban canyons, emerging terrestrial 5G millimeter-wave and non-terrestrial low Earth orbit (LEO) satellite signals of …
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Time and Frequency Transfer in a Coherent Multistatic Radar using a White Rabbit Network
… and Doppler estimation. TFT techniques based on global navigation satellite systems (GNSS), have been favoured for several reasons, such as enabling node mobility through wireless operation, geospatial referencing, and atomic clock level time and frequency stability. However, such systems are …
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Galileo Search and Rescue (SAR): Análisis del sistema y simulación del balance de enlace
… Sistemas de Radionavegación por Satélite o GNSS (Global Navigation Satellite Systems) se han convertido en un elemento esencial para la sociedad, donde múltiples servicios y sistemas basan su funcionamiento en las capacidades de posicionamiento proporcionadas por dichos sistemas. En este contexto …
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Advanced Receiver Autonomous Integrity Monitoring for Multi-Constellation GNSS and LEO-Augmented GNSS
Global Navigation Satellite Systems (GNSS), including the U.S. Global Positioning System (GPS), the European Galileo, Russia's GLONASS, and China's BeiDou, have become essential for modern positioning, navigation, and timing (PNT) services, from driving directions to timing in telecommunications. …
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Small Spacecraft Design & Machine Learning-based Approaches To Lunar Robotics Navigation
… be facilitated by two key technologies: small satellites and machine learning (ML). Nowadays, satellite technologies have progressed to the point where off-the-shelf components can be purchased for small-satellite missions, greatly reducing the time and cost needed to prepare a new mission. The …
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Vehicle autonomy under the Arctic ice: environmental adaptation through model-aided machine learning
… benefit from high-throughput communication systems which enable accurate positioning and operator input; Autonomous Underwater Vehicles (AUVs), however, generally require a higher degree of autonomy as they must rely on much more limited communication links and lack access to global …
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Characterization of the Multipath Environment of Ionospheric Scintillation Receivers
Global Navigation Satellite Systems (GNSS) are used to provide information on position, time and velocity all over the world at any time of the day. Currently there are four operational GNSS and one of them is GPS (Global Positioning System) that is developed and maintained by U.S Department of …
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