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 15 of 15 for “"GLONASS"”.
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Implementation of Real-Time Software Receiver for Gps or Glonass L1 Signals
… also explores a real-time correlator for the GLONASS L1 signals. This software receiver is going to be used for scientific research and education. This work is a part of the ongoing effort to develop a low-cost, flexible, and capable GNSS receiver for use as a scientific instrument and for …
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Factors That Affect the Global Positioning System and Global Navigation Satellite System in an Urban and Forested Environment.
… in real time measurements acquired from GPS and GLONASS satellite observations using RTK techniques in an urban and forested environment. To determine this accuracy, 2 data sets of 3-dimensional coordinates were created and compared at 14 stations situated at East Tennessee State University. One …
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Infrared Thermography And High Accuracy Gps For Automated Asphalt Crack Detection
… (GNSS) which currently includes the GPS and GLONASS constellations. With the help of these systems, accurate location coordinates (longitude, latitude and altitude) up to a few centimeters were located. The objective of this research is to test the combined use of GNSS and infrared …
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Real-time GNSS for fast seismic source inversion and tsunami early warning
… temporal point positioning from GPS-only to GPS/GLONASS and assessed the potential benefits of multi-GNSS for co-seismic displacement determination. Out-door experiments reveal that when observations are conducted in an adversary environment, adding a couple of GLONASS satellites could provide …
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The effect of differential color refraction on astrometric observations of Solar System bodies and Earth satellites from ground-based optical telescopes
… spectral types and in observations of GPS and GLONASS satellites. DCR bias is on the order of 0.1 arcsec, and until recently, őxed-pattern star catalog errors exceeded this level. With the release of the Gaia DR2 star catalog in April of 2018, catalog error is no longer dominant and the …
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Online estimation of inter-frequency/system phase biases in precise positioning
… (IFB) in GLObal NAvigation Satellite System (GLONASS) data processing and the inter-system bias (ISB) in multi-GNSS integration. Hence, the main objective of this thesis is the investigation, estimation and correction of these biases in carrier phase observations to achieve better positioning …
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Remote synchronization method for the quasi-zenith satellite system
… navigation satellite systems such as GPS, GLONASS or the planned GALILEO system. This concept is differentiated by the employment of a synchronization framework combined with lightweight steerable on-board clocks which act as transponders re-broadcasting the precise time remotely provided by …
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A Multi-Constellation Multi-Frequency GNSS Software Receiver Design for Ionosphere Scintillation Studies
… RF front ends to collect wideband GPS L5 and GLONASS L1 and L2 signals. The results confirm that scintillation has a stronger impact on GPS L2 and L5 signals than on the L1 signal. Our preliminary results also show that carrier phase and amplitude scintillations on each signal are highly …
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Four-constellation GNSS Reliability and the Estimation of Inter-system Time-offsets for Improved Performance in Challenging Signal Environments
… when using ranging signals from combined GPS, GLONASS, BeiDou and Galileo constellations in urban environments. Furthermore, this study assesses the benefits of using a priori inter-system clock-offset information. The positioning performance of multiple GNSS constellations has been examined …
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Low power, reduced complexity filtering and improved tracking accuracy for GNSS
… GLObalnaya NAvigatsionnaya Sputnikovaya Sistema (GLONASS) receiver, the pseudorange measurements of the receiver varied by up to 200 metres. The work undertaken proposes various methods that overcomes the pseudorange measurement variation and reports on the results that are on par with …
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GNSS-based Spacecraft Formation Flying Simulation and Ionospheric Remote Sensing Applications
… measurement and model evaluation system. GPS, GLONASS, Galileo and Beidou constellations are considered in this work. Multi-constellation GNSS TEC measurements and the GNSS-based HIL simulation testbed were integrated and applied to design a LEO satellite formation flying mission for …
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Advanced Receiver Autonomous Integrity Monitoring for Multi-Constellation GNSS and LEO-Augmented GNSS
… 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. In safety-critical areas such as aviation, it is not enough for these systems …
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GNSS kinematic position and velocity determination for airborne gravimetry
… die Signale mehrerer GNSS-Systeme (d.h. GPS und GLONASS) gemeinsam registriert und ausgewertet (sog. GNSS-Integration). Zur Optimierung des relativen Gewichts zwischen den Daten der verschiedenen GNSS-Systeme wird die Helmertsche Varianz-Komponenten-Schätzung angewandt. Der auf dieser Basis …
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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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Real-time Adaptive Cancellation of Satellite Interference in Radio Astronomy
Radio astronomy is the science of observing the heavens at radio frequencies, from a few kHz to approximately 300 GHz. In recent years, radio astronomy has faced a growing interference problem as radio frequency (RF) bandwidth has become an increasingly scarce commodity. A programmable real-time …