Global ETD Search
Search theses and dissertations gathered from participating repositories worldwide. Every result links back to the library that holds it. No account is needed.
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Showing 1 to 20 of 178 for “"GNSS"”.
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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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Mehrwegeausbreitung bei GNSS-gestützter Positionsbestimmung
GNSS-Messungen werden neben systembedingten Fehlereinflüssen vor allem von den Auswirkungen der Mehrwegeausbreitung und Signalbeugung insbesondere in der Empfangsumgebung dominiert. Verschiedene Dienste z.B. der Landesvermessungsämter haben deshalb ein primäres Interesse daran, die Auswirkungen der …
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Performance analysis of assisted-GNSS receivers
… of Global Navigation Satellite System (GNSS) receivers that use assistance data provided by cellular networks. A typical example of such a receiver is a mobile phone including a Global Positioning System (GPS) receiver. Using assistance data such as an accurate estimate of the GPS system …
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Tsunami Excitation Estimation from Real-time GNSS
… minutes, before local runup occurs. Real-time GNSS measurements of coseismic offsets may be used to estimate finite faulting within 1-2 minutes and, in turn, tsunami excitation for local warning purposes (Blewitt et al., 2006; Melgar and Bock, 2013; Yue and Lay, 2011). Described here is a …
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Multi-Constellation GNSS Scintillation at Mid-Latitudes
Scintillation of Global Positioning Systems (GPS) signals have been extensively studied at low and high latitude regions of the Earth. It has been shown in past studies that amplitude scintillation is severe at low latitudes and phase scintillation is severe at high latitudes. Unlike low and high …
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GNSS Signal Processing Techniques for Spoofing Resiliency
Global Navigation Satellite Systems (GNSS) for vehicle navigation and timing are widely relied upon by many users in a variety of different sectors such as transit, financial, military, and many others. There are a number of ways for an agent to purposefully degrade a GNSS user's navigation …
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Multi-GNSS real-time precise satellite clock estimation
Nowadays, Global Navigation Satellite Systems (GNSS) play a pivotal role in precise positioning in geosciences and various related domains. Among all GNSS positioning services, real-time precise point positioning (PPP) stands out for its global consistency and flexibility. The quality of real-time …
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GNSS kinematic position and velocity determination for airborne gravimetry
Das weltumspannende Satelliten-Navigationssystem GNSS spielt eine wichtige Rolle für die Fluggravimetrie. Gegenstand dieser Arbeit ist die Entwicklung zuverlässiger GNSS-Algorithmen und Software für die hochgenaue GNSS-Datenanalyse in der Fluggravimetrie. Ausgehend von den Anforderungen für …
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Observation of Low Earth Orbit Debris using GNSS Radar
… multi-static radars. In this work, we focus on GNSS as an emitter of opportunity to enhance Space Situational Awareness (SSA) by tracking small items of space debris using bistatic radar. However, the scattered GNSS signal levels from small items of space debris are incredibly low and the …
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Quality control of the kinematic positioning into GNSS networks
GNSS (Global Navigation Satellite System) positioning is nowadays a common practice, not only in academia but also in the professional world, thanks to the development of several types of instruments and the decreasing costs of the receivers and antennae. Today, considering also the new …
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High-performance velocity, frequency and time estimation using GNSS
GNSS (Global Navigation Satellite System) receivers provide PVT solution, where PVT stands for Position, Velocity and Time. In general, the main interest of the common GNSS user is on the position solution and as a consequence the main focus of the research is the improvement of the position …
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Potential of cooperation between GNSS users in lunar orbits
L'abstract è presente nell'allegato / the abstract is in the attachment
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Total Electron Content reconstruction using triple frequency GNSS signals
Nowadays, Global Navigation Satellite System (GNSS) provide accurate three dimensional positioning and navigation anywhere and anytime on the Earth’s surface and are being utilized in numerous civilian and military applications. The US Global Positioning System (GPS) is currently being modernized …
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GNSS-based relative navigation for LEO nanosatellite laser communications
… the initial Global Navigation Satellite System (GNSS) based relative navigation pointing process for LEO crosslinks and downlinks. In Chapter 2, the baseline CLICK pointing budgets are given for crosslink and downlink relative navigation based body pointing. For crosslink, the 9 9 th percentile …
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GNSS Hardware-In-The-Loop Formation and Tracking Control
… data collection, and building a real-time GNSS closed HWIL testbed for simulations of different vehicles. The L1 frequency band of the Global Positioning System (GPS) constellation is used to observe and generate raw measurement data that encompasses range, pseudo-range, and Doppler …
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Study of Robust GNSS-based Positioning Solutions for Challenging Environments
L'abstract è presente nell'allegato / the abstract is in the attachment
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Contributions to a Context-Aware High Sensitivity GNSS Software Receiver
GNSS have established themselves as the dominant positioning technology to provide location and navigation solutions with high reliability and accuracy with low-cost portable user devices. However, receiver performance can be significantly affected by operational environments. High attenuation and …
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Lokalizace a navigace dronu ve známém prostředí bez využití GNSS
… vývojom lokalizačného systému bez využitia GNSS. V prvej časti práce sú charakterizované technológie, ktoré je možné použiť na určovanie polohy v priestore. Taktiež sú opísané metódy určovania vzdialenosti medzi vysielačom a prijímačom. V ďalšej časti práce je vysvetlený spôsob komunikácie …
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