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Showing 1 to 12 of 12 for “"ionospheric scintillation"”.
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Characterization of the Multipath Environment of Ionospheric Scintillation Receivers
… and amplitude of the received signal, called scintillation. Interference of GNSS signals that are reflected and refracted from stationary objects on the ground, with signals that travel along a direct path via the ionosphere to the antenna, cause errors in the measured amplitude and phase. …
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Contemporary Ionospheric Scintillation Studies: Statistics, 2D Analytical and 3D Numerical Inversion
The propagation of radiowaves through ionospheric irregularities can lead to random amplitude and phase fluctuations of the signal, otherwise known as scintillation, which can severely impact the performance of Global Navigation Satellite System (GNSS) and communication systems. Research into high …
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Ionospheric Scintillation Prediction, Modeling, and Observation Techniques for the August 2017 Solar Eclipse
… to measure these changes, one of these being ionospheric scintillation. Ionospheric scintillation is rapid amplitude and phase fluctuations of signals passing through the ionosphere caused by electron density irregularities in the ionosphere. At mid-latitudes, scintillation is not as common of …
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Development of a Multi-Frequency Adaptive Kalman Filter Based Tracking Loop for an Ionospheric Scintillation Monitoring Receiver
… results in a robust tracking loop suitable for a scintillation monitoring receiver. It also incorporates an adaptive algorithm that has adaptive bandwidth depending on scintillation level. Performance of combined KF based tracking algorithm compared with that of single frequency KF based tracking …
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Identifying Ionospheric Scintillation in the South Atlantic Magnetic Anomaly using motion-affected GPS data from a ship-based receiver
… dual-frequency Global Positioning System (GPS) Ionospheric Scintillation and Total Electron Content Monitor (GISTM), in an attempt to identify instances of ionospheric scintillation over the South Atlantic Magnetic Anomaly (SAMA) while located aboard the moving polar research vessel SA Agulhas …
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Receiver synchronization for the opportunistic use of integrated service digital broadcasting – terrestrial digital television signals
… television are transmitted at high power. The Ionospheric Scintillation Explorer (ISX) mission dedicated to studying the ionospheric scintillations has been suggested by SRI International, Inc. as a satellite which will receive the trans-ionospheric digital television signals. In order to …
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Navigation for UAVs using Signals of Opportunity
… both incidental (e.g. terrain shadowing, ionospheric scintillation) and malicious (e.g. jamming, spoofing). An accurate and reliable alternative UAV navigation system is proposed that exploits Signals of Opportunity (SOP) thus offering superior signal strength and spatial diversity …
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Influence of lightning on electron density variation in the ionosphere using WWLLN lightning data and GPS data
… of wave-like structures in the form of Traveling Ionospheric Disturbances (TID) in the ionosphere and tropospheric lightning in the mid-latitude region over South Africa. Lightning induced changes in total electron content (TEC) are strongest between September and March, with the more-pronounced …
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Design, Analysis, Fabrication, and Testing of a Nanosatellite Structure
… high risk/low cost spacecraft. The Virginia Tech Ionospheric Scintillation Measurement Mission, known as HokieSat, is a 40 lb nanosatellite being designed and built by graduate and undergraduate students. The satellite is part of the Ionospheric Observation Nanosatellite Formation (ION-F) which …
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Investigation of High Latitude Ionospheric Irregularities utilizing Modeling and GPS Observations
… regions pose challenges in designing global scintillation models. This dissertation takes some steps towards bridging these gaps while advancing the state-of-the-art high latitude irregularity studies. In the first part of this dissertation, we briefly describe the Autonomous Adaptive …
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Peramalan jumlah kandungan elektron menggunakan kaedah suapan ke hadapan rangkaian neural di Semenanjung Malaysia
… system (GPS) data and provides an indication of ionospheric variability. TEC variations have significant effects on radio communications, applications involving navigational systems, GPS surveying and space weather. In order to understand these effects, there is a need to develop forecasting …
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Radio Propagation Through Density Irregularities in the Auroral Ionosphere
… fluctuations. These fluctuations are called<em> ionospheric</em><em> scintillation</em>. Scintillation effects can be detrimental to Global Navigation Satellite Systems (GNSS) such as Global Positioning System (GPS), but the observed effects can be used as a tool to study the underlying plasma …