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Littérature scientifique sur le sujet « Scintillation-Ionospheric »

Auteur : Grafiati

Publié le 6 septembre 2023

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Articles de revues sur le sujet "Scintillation-Ionospheric"

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Liu, Qi, Lunlong Zhong et Jing Zhao. « Design of GNSS Receiver Autonomous Integrity Monitoring Platform under Ionospheric Scintillation ». Journal of Physics : Conference Series 2252, n^o 1 (1 avril 2022) : 012035. http://dx.doi.org/10.1088/1742-6596/2252/1/012035.

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Abstract How to evaluate the impact of ionospheric scintillation on the availability of RAIM technology is a key problem to be solved in the field of global satellite navigation system (GNSS) security applications. Based on the relationship between ionospheric scintillation and satellite navigation signal parameters, a scheme of RAIM technology monitoring platform for satellite navigation receiver under ionospheric scintillation is proposed. Firstly, the phase screen model is used to simulate the GNSS satellite navigation signal affected by ionospheric scintillation. Then, the key module of GNSS receiver autonomous integrity monitoring platform under ionospheric scintillation is designed. Simulation results show that the designed platform can effectively simulate satellite navigation signals under ionospheric scintillation and test the effectiveness of various RAIM technology.

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Liu, Qi, Lunlong Zhong et Jing Zhao. « Design of GNSS Receiver Autonomous Integrity Monitoring Platform under Ionospheric Scintillation ». Journal of Physics : Conference Series 2252, n^o 1 (1 avril 2022) : 012035. http://dx.doi.org/10.1088/1742-6596/2252/1/012035.

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Abstract How to evaluate the impact of ionospheric scintillation on the availability of RAIM technology is a key problem to be solved in the field of global satellite navigation system (GNSS) security applications. Based on the relationship between ionospheric scintillation and satellite navigation signal parameters, a scheme of RAIM technology monitoring platform for satellite navigation receiver under ionospheric scintillation is proposed. Firstly, the phase screen model is used to simulate the GNSS satellite navigation signal affected by ionospheric scintillation. Then, the key module of GNSS receiver autonomous integrity monitoring platform under ionospheric scintillation is designed. Simulation results show that the designed platform can effectively simulate satellite navigation signals under ionospheric scintillation and test the effectiveness of various RAIM technology.

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Sivavaraprasad, G., D. Venkata Ratnam et Yuichi Otsuka. « Multicomponent Analysis of Ionospheric Scintillation Effects Using the Synchrosqueezing Technique for Monitoring and Mitigating their Impact on GNSS Signals ». Journal of Navigation 72, n^o 3 (28 novembre 2018) : 669–84. http://dx.doi.org/10.1017/s0373463318000929.

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Ionospheric scintillation effects degrade satellite-based radio communication/navigation links and influence the performance of Global Navigation Satellite Systems (GNSS). An adaptive wavelet-based decomposition technique, Synchrosqueezing Transform (SST), with a Detrended Fluctuation Analysis (DFA) algorithm has been implemented for time-frequency representation of GNSS multi-component signals and mitigation of scintillation effects. Synthetic In-phase (I) and Quadra-phase (Q) samples were collected from the Cornell Scintillation Model (CSM) and the CSM amplitude scintillation signal was processed with SST-DFA for the detection of noisy scintillation components and mitigation of ionospheric scintillation effects. Also, performance of the SST-DFA algorithm was tested for real-time GNSS ionospheric scintillation data collected from a GNSS Software Navigation Receiver (GSNRx) located at a low-latitude station in Rio de Janeiro, Brazil. The de-noising performance of the SST-DFA algorithm was further evaluated and compared with a low-pass Butterworth filter during different ionospheric scintillation time periods. The experimental results clearly demonstrated that the proposed method is reliable for mitigation of ionospheric scintillation noise both in time and frequency scales.

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Prikryl, P., P. T. Jayachandran, S. C. Mushini et R. Chadwick. « Climatology of GPS phase scintillation and HF radar backscatter for the high-latitude ionosphere under solar minimum conditions ». Annales Geophysicae 29, n^o 2 (22 février 2011) : 377–92. http://dx.doi.org/10.5194/angeo-29-377-2011.

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Abstract. Maps of GPS phase scintillation at high latitudes have been constructed after the first two years of operation of the Canadian High Arctic Ionospheric Network (CHAIN) during the 2008–2009 solar minimum. CHAIN consists of ten dual-frequency receivers, configured to measure amplitude and phase scintillation from L1 GPS signals and ionospheric total electron content (TEC) from L1 and L2 GPS signals. Those ionospheric data have been mapped as a function of magnetic local time and geomagnetic latitude assuming ionospheric pierce points (IPPs) at 350 km. The mean TEC depletions are identified with the statistical high-latitude and mid-latitude troughs. Phase scintillation occurs predominantly in the nightside auroral oval and the ionospheric footprint of the cusp. The strongest phase scintillation is associated with auroral arc brightening and substorms or with perturbed cusp ionosphere. Auroral phase scintillation tends to be intermittent, localized and of short duration, while the dayside scintillation observed for individual satellites can stay continuously above a given threshold for several minutes and such scintillation patches persist over a large area of the cusp/cleft region sampled by different satellites for several hours. The seasonal variation of the phase scintillation occurrence also differs between the nightside auroral oval and the cusp. The auroral phase scintillation shows an expected semiannual oscillation with equinoctial maxima known to be associated with aurorae, while the cusp scintillation is dominated by an annual cycle maximizing in autumn-winter. These differences point to different irregularity production mechanisms: energetic electron precipitation into dynamic auroral arcs versus cusp ionospheric convection dynamics. Observations suggest anisotropy of scintillation-causing irregularities with stronger L-shell alignment of irregularities in the cusp while a significant component of field-aligned irregularities is found in the nightside auroral oval. Scintillation-causing irregularities can coexist with small-scale field-aligned irregularities resulting in HF radar backscatter. The statistical cusp and auroral oval are characterized by the occurrence of HF radar ionospheric backscatter and mean ground magnetic perturbations due to ionospheric currents.

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Zhu, Wendan, Lunlong Zhong et Yupeng Li. « Performance Analysis of Satellite Navigation Positioning Service under Ionospheric Scintillation ». Journal of Physics : Conference Series 2252, n^o 1 (1 avril 2022) : 012036. http://dx.doi.org/10.1088/1742-6596/2252/1/012036.

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Abstract Satellite navigation signals may be affected by ionospheric anomalies such as ionospheric scintillation and ionospheric storms. These anomalies will lead to fluctuations and delays of signals, and thus affecting the performance of satellite navigation service. How to evaluate the performance of satellite navigation service under the influence of ionospheric anomaly is one of the key issues to ensure the safety of satellite navigation aviation service. To solve this problem, the simulation of satellite navigation signals under scintillation and the performance evaluation of positioning service are studied in this paper. Firstly, the scintillation sequence is simulated based on Cornell model. Then, the influence of scintillation on satellite signal parameters is modeled and a generation approach of intermediate frequency satellite navigation signals under scintillation is proposed. Finally, the performance indicators of normal signal and scintillating signal are quantitatively analyzed by solving the navigation parameters and evaluating the performance indicators of the receiver. Simulation results show that the ionospheric scintillation affects the satellite navigation service performance, with reference to the standard specification requirements. Performance of satellite navigation positioning service is severely affected even only one satellite signal is affected by a common moderate scintillation level.

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Zhu, Wendan, Lunlong Zhong et Yupeng Li. « Performance Analysis of Satellite Navigation Positioning Service under Ionospheric Scintillation ». Journal of Physics : Conference Series 2252, n^o 1 (1 avril 2022) : 012036. http://dx.doi.org/10.1088/1742-6596/2252/1/012036.

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Abstract Satellite navigation signals may be affected by ionospheric anomalies such as ionospheric scintillation and ionospheric storms. These anomalies will lead to fluctuations and delays of signals, and thus affecting the performance of satellite navigation service. How to evaluate the performance of satellite navigation service under the influence of ionospheric anomaly is one of the key issues to ensure the safety of satellite navigation aviation service. To solve this problem, the simulation of satellite navigation signals under scintillation and the performance evaluation of positioning service are studied in this paper. Firstly, the scintillation sequence is simulated based on Cornell model. Then, the influence of scintillation on satellite signal parameters is modeled and a generation approach of intermediate frequency satellite navigation signals under scintillation is proposed. Finally, the performance indicators of normal signal and scintillating signal are quantitatively analyzed by solving the navigation parameters and evaluating the performance indicators of the receiver. Simulation results show that the ionospheric scintillation affects the satellite navigation service performance, with reference to the standard specification requirements. Performance of satellite navigation positioning service is severely affected even only one satellite signal is affected by a common moderate scintillation level.

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Spogli, L., L. Alfonsi, G. De Franceschi, V. Romano, M. H. O. Aquino et A. Dodson. « Climatology of GPS ionospheric scintillations over high and mid-latitude European regions ». Annales Geophysicae 27, n^o 9 (1 septembre 2009) : 3429–37. http://dx.doi.org/10.5194/angeo-27-3429-2009.

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Abstract. We analyze data of ionospheric scintillation in the geographic latitudinal range 44°–88° N during the period of October, November and December 2003 as a first step to develop a "scintillation climatology" over Northern Europe. The behavior of the scintillation occurrence as a function of the magnetic local time and of the corrected magnetic latitude is investigated to characterize the external conditions leading to scintillation scenarios. The results shown herein, obtained merging observations from four GISTM (GPS Ionospheric Scintillation and TEC Monitor), highlight also the possibility to investigate the dynamics of irregularities causing scintillation by combining the information coming from a wide range of latitudes. Our findings associate the occurrences of the ionospheric irregularities with the expected position of the auroral oval and ionospheric troughs and show similarities with the distribution in magnetic local time of the polar cap patches. The results show also the effect of ionospheric disturbances on the phase and the amplitude of the GPS signals, evidencing the different contributions of the auroral and the cusp/cap ionosphere.

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Huang, Zhi, Hong Yuan et Qi Yao Zuo. « Extracting Ionosphere Scintillations Index Based on Single Frequency GPS Software Receiver ». Applied Mechanics and Materials 190-191 (juillet 2012) : 1136–43. http://dx.doi.org/10.4028/www.scientific.net/amm.190-191.1136.

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Scintillations are caused by ionospheric plasma-density irregularities and can lead to signal power fading, loss of lock of the carrier tracking loop in the GPS receiver. The traditional method of monitoring and mitigating scintillation is to transform commercial GPS receiver with modified hardware and embedded software. To better facilitate advance development GPS receiver under different condition, GPS software scintillation receiver is designed in this paper. The hardware scheme of high-speed GPS signal acquisition system is first discussed and implemented with FPGA and DSP architecture. Then, we describe receiver software processing algorithm, particularly the portion involving the scintillation signal acquisition and tracking, ionospheric scintillation index extracting and scintillation monitoring. The performance of software receiver is demonstrated under scintillation conditions. Relevant results show that software-receiver based approach can avoid weak signal loss and extract effectively ionospheric scintillation parameter compared with the traditional extracting method. Software receiver is suitable and reliable for the ionospheric scintillations monitoring, and can provide theoretical foundations and experimental preparations for future scintillation studies implemented with Chinese indigenous BeiDou-Ⅱ navigation and poisoning system.

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Aquino, Marcio, Terry Moore, Alan Dodson, Sam Waugh, Jock Souter et Fabiano S. Rodrigues. « Implications of Ionospheric Scintillation for GNSS Users in Northern Europe ». Journal of Navigation 58, n^o 2 (18 avril 2005) : 241–56. http://dx.doi.org/10.1017/s0373463305003218.

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Extensive ionospheric scintillation and Total Electron Content (TEC) data were collected by the Institute of Engineering Surveying and Space Geodesy (IESSG) in Northern Europe during years of great impact of the solar maximum on GNSS users (2001–2003). The ionospheric TEC is responsible for range errors due to its time delay effect on transionospheric signals. Electron density irregularities in the ionosphere, occurring frequently during these years, are responsible for (phase and amplitude) fluctuations on GNSS signals, known as ionospheric scintillation. Since June 2001 four GPS Ionospheric Scintillation and TEC Monitor receivers (the NovAtel/AJ Systems GSV4004) have been deployed at stations in the UK and Norway, forming a Northern European network, covering geographic latitudes from 53° to 70° N approximately. These receivers compute and record GPS phase and amplitude scintillation parameters, as well as TEC and TEC variations. The project involved setting up the network and developing automated archiving and data analysis strategies, aiming to study the impact of scintillation on DGPS and EGNOS users, and on different GPS receiver technologies. In order to characterise scintillation and TEC variations over Northern Europe, as well as investigate correlation with geomagnetic activity, long-term statistical analyses were also produced. This paper summarises our findings, providing an overview of the potential implications of ionospheric scintillation for the GNSS user in Northern Europe.

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Prikryl, P., P. T. Jayachandran, R. Chadwick et T. D. Kelly. « Climatology of GPS phase scintillation at northern high latitudes for the period from 2008 to 2013 ». Annales Geophysicae 33, n^o 5 (13 mai 2015) : 531–45. http://dx.doi.org/10.5194/angeo-33-531-2015.

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Abstract. Global positioning system scintillation and total electron content (TEC) data have been collected by ten specialized GPS Ionospheric Scintillation and TEC Monitors (GISTMs) of the Canadian High Arctic Ionospheric Network (CHAIN). The phase scintillation index σΦ is obtained from the phase of the L1 signal sampled at 50 Hz. Maps of phase scintillation occurrence as a function of the altitude-adjusted corrected geomagnetic (AACGM) latitude and magnetic local time (MLT) are computed for the period from 2008 to 2013. Enhanced phase scintillation is collocated with regions that are known as ionospheric signatures of the coupling between the solar wind and magnetosphere. The phase scintillation mainly occurs on the dayside in the cusp where ionospheric irregularities convect at high speed, in the nightside auroral oval where energetic particle precipitation causes field-aligned irregularities with steep electron density gradients and in the polar cap where electron density patches that are formed from a tongue of ionization. Dependences of scintillation occurrence on season, solar and geomagnetic activity, and the interplanetary magnetic field (IMF) orientation are investigated. The auroral phase scintillation shows semiannual variation with equinoctial maxima known to be associated with auroras, while in the cusp and polar cap the scintillation occurrence is highest in the autumn and winter months and lowest in summer. With rising solar and geomagnetic activity from the solar minimum to solar maximum, yearly maps of mean phase scintillation occurrence show gradual increase and expansion of enhanced scintillation regions both poleward and equatorward from the statistical auroral oval. The dependence of scintillation occurrence on the IMF orientation is dominated by increased scintillation in the cusp, expanded auroral oval and at subauroral latitudes for strongly southward IMF. In the polar cap, the IMF BY polarity controls dawn–dusk asymmetries in scintillation occurrence collocated with a tongue of ionization for southward IMF and with sun-aligned arcs for northward IMF. In investigating the shape of scintillation-causing irregularities, the distributions of scintillation occurrence as a function of "off-meridian" and "off-shell" angles that are computed for the receiver–satellite ray at the ionospheric pierce point are found to suggest predominantly field-aligned irregularities in the auroral oval and L-shell-aligned irregularities in the cusp.

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Thèses sur le sujet "Scintillation-Ionospheric"

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Jiao, Yu. « High Latitude Ionospheric Scintillation Characterization ». Miami University / OhioLINK, 2013. http://rave.ohiolink.edu/etdc/view?acc_num=miami1376909513.

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Ho, Yih Hwa. « Mitigation of ionospheric scintillation effects on GNSS ». Thesis, University of Leeds, 2010. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.539702.

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Moraes, Alison de Oliveira. « Advances in statistical modeling of ionospheric scintillation ». Instituto Tecnológico de Aeronáutica, 2013. http://www.bd.bibl.ita.br/tde_busca/arquivo.php?codArquivo=2240.

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Ionospheric scintillation is a phenomenon that occurs daily, especially around the equatorial region, during the summer solstice after the sunset, affecting radio signals that propagate through the ionosphere. Depending on the temporal and spatial situation, ionospheric scintillation can represent a problem in the availability and precision of the Global Navigation Satellite Systems (GNSS). This work is concerned with the statistical modeling and evaluation of the impact of amplitude scintillation on the performance of Global Positioning System (GPS) receivers. In this work the use of ?-? model is proposed to represent the scintillation phenomenon affecting GPS receiver performance. The use of ?-? is also extended for second order statistics. Such a model is compared to a set of experimental data obtained in São José dos Campos, near the peak of the Equatorial Anomaly, during high solar fux conditions, between the months of December 2001 and January 2002. The results obtained with the proposed ?-? model fitted quite well with the experimental data and performed better than two of the widely used models, namely Nakagami-m and Rice. The proposed model requires the estimation of two parameters, instead of a single one used by the models of Nakagami-m and Rice. To facilitate its use, for the situations in which no set of experimental data is available, this work presents parameterized equations for calculating the two parameters required by the ?-? model. Based upon the fact that the proposed model performs better than the one proposed by Nakagami-m, the present investigation derives a model to estimate the carrier and code tracking loop errors on GPS receivers. Such a model not only performed better than Nakagami';s, but also is valid for a wider range of scintillation.

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Burston, Robert. « Investigating ionospheric scintillation mechanisms via theory and experimentation ». Thesis, University of Bath, 2009. https://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.516941.

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This thesis aims to answer the question, “What physical process dominates the formation of plasma irregularities, capable of directly or indirectly causing GPS L1 band scintillation, in polar cap plasma patches during magnetic storm conditions?.” A novel modelling technique utilising an ionospheric imaging algorithm is developed and used to elucidate the relative importance of the two most commonly discussed processes. These are the Gradient Drift Instability (GDI) and turbulence induced by electric field mapping to the ionosphere from the magnetosphere. The results show that in magnetic storm conditions, at times the GDI process is dominant, but that at other times turbulence may be as significant as the GDI in determining how the plasma within a polar cap patch behaves, possibly more so. This in turn suggests that further study of the turbulence process is necessary in order to fully understand how big a role it plays in causing GPS L1 band scintillation in the polar cap. The success of the modelling technique developed here shows the utility of ionospheric imaging as a tool for understanding physical problems of the ionosphere; efforts to improve it and to apply it in other contexts would be worthwhile.

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Knight, Mark Frederick. « Ionospheric scintillation effects on global positioning system receivers ». Title page, contents and abstract only, 2000. http://web4.library.adelaide.edu.au/theses/09PH/09phk698.pdf.

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Boryczko, Marta, et Tomasz Dziendziel. « Optimisation Of Ionospheric Scintillation Model Used In Radio Occultation ». Thesis, Blekinge Tekniska Högskola, Institutionen för tillämpad signalbehandling, 2016. http://urn.kb.se/resolve?urn=urn:nbn:se:bth-11915.

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This thesis is executed in cooperation with RUAG Space AB, which specializes in highly reliable on-board satellite equipment. The thesis focuses on the effect, which disturbs the amplitude and phase of a Global Positioning System (GPS) signal, called scintillation effect. It has a substantial impact on a GPS signal, during Radio Occultation (RO). RO is a method of analysis of a refracted signal which passes through the atmosphere. RO can be used for measuring climate change and for weather forecasting. By retrieving the bending angle of a GPS signal, three basic parameters of the Earth’s atmosphere can be obtained at different heights: temperature, pressure and humidity. As the scintillation effect causes prominent errors in the bending angle calculations, it is crucial to provide possibly the most precise mathematical model, which allows to conceive proper ionospheric corrections. In this thesis, the model using Rytov approach is implemented and optimised with different optimisation functions. It is shown that the scintillation model can be optimized, which may contribute to a more accurate retrieval of the atmospheric profiles.

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Atilaw, Tsige Yared. « Characterization of the Multipath Environment of Ionospheric Scintillation Receivers ». Master's thesis, University of Cape Town, 2015. http://hdl.handle.net/11427/16475.

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Includes bibliographical references
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 Defence (DoD), which is widely used and accessible all over the world. The accuracy of the output or even the availability of the navigation system depends on current space weather conditions, which can cause random fluctuations of the phase 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. These errors are known as multipath errors and can lead to cycle slip and loss of lock on the satellite or degradation in the accuracy of position determination. High elevation cut off angles used for filtering GNSS signals, usually 15-30°, can reduce non-ionospheric interference due to multipath signals coming from the horizon. Since a fixed-elevation threshold does not take into consideration the surrounding physical environment of each GPS station, it can result in a significant loss of valuable data. Alternatively, if the fixed-elevation threshold is not high enough we run the risk of including multipath data in the analysis. In this project we characterized the multipath environment of the GPS Ionospheric Scintillation and TEC (Total Electron Content) Monitor (GISTM) receivers installed by SANSA (South African National Space Agency) at Gough Island (40:34oS and 9:88° W), Marion Island (46:87° S and 37:86° E), Hermanus (34:42° S and19:22° E) and SANAE IV (71:73° S and 2:2° W) by plotting azimuth-elevation maps of scintillation indices averaged over one year. The azimuth-elevation maps were used to identify objects that regularly scatter signals and cause high scintillation resulting from multipath effects. After identifying the multipath area from the azimuth-elevation map, an azimuth-dependent elevation threshold was developed using the MATLAB curve fitting tool. Using this method we are able to reduce the multi-path errors without losing important data. Using the azimuth-dependent elevation threshold typically gives 5 to 28% more useful data than using a 20° fixed-elevation threshold.

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Kumagai, Hiroshi. « Mid-latitude ionospheric irregularities deduced from spacedreceiver scintillation measurements ». Kyoto University, 1988. http://hdl.handle.net/2433/162220.

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Romano, Vincenzo. « Ionospheric scintillation effects on GNSS : monitoring and data treatment development ». Thesis, University of Nottingham, 2016. http://eprints.nottingham.ac.uk/33909/.

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The increasing importance of satellite navigation technologies in modern society implies that a deeper knowledge and a reliable monitoring of the scintillation phenomena are essential to warn and forecast information to the end users and system designers. In fact, warnings, alerts and forecasting of ionospheric conditions may wisely tune the development of GNSS-based services to obtain the necessary levels of accuracy, integrity, and immediacy for reliable life-critical applications. The PhD research project is within the framework of the longstanding NGI-INGV collaboration, increasingly consolidated in the framework of many international projects. NGI pioneered GPS ionospheric scintillation monitoring in Northern Europe with GISTM (GPS ionospheric scintillation and TEC monitor, Van Dierendonck et al., 1993; Van Dierendonck, 2001) receivers. Between June 2001 and December 2003, four units were installed in the UK and Norway mainland, covering the geographic latitudes from 53° N to 70° N. Data was stored and analysed, focusing on statistical analyses and impact for GNSS users (Rodrigues et al., 2004, Aquino et al., 2005a, Aquino et al., 2005b). These units were decommissioned in 2004 and, then, re-deployed together with additional new receivers, in UK, Norway, Italy and Cyprus. An additional station was deployed by the NGI in Dourbes, Belgium (in collaboration with the Royal Meteorological Institute of Belgium) between 2006 and 2011. INGV leads the ISACCO (Ionospheric Scintillation Arctic Campaign Coordinated Observations) project in the Arctic, started in 2003, in which frame the management of three GISTM receivers in Svalbard (De Franceschi et al., 2006) and another two at European mid-latitudes, Chania (Greece) and Lampedusa (Italy), is currently undertaken. The PhD research project contributed to the reinforcement of the NGI-INGV GISTM network developing monitoring, data management and quality tools. Such activities have supported the continuity and the control of the receiving stations, as well as the access and the preservation of the both real-time and historical data acquired. In fact, a robust, continuous data acquisition and a wise management of the GISTM network are of paramount importance for Space Weather applications, as they are the basis on which reliable forecasting and now-casting of possible effects on technological systems lean. Moreover, the possibility to use the data for scientific and applicative purposes depends upon well-established data quality procedures and upon a detailed knowledge of the sites in which each receiver comprising the network are deployed. Starting from these considerations, and in the framework of the aforementioned collaborative context, the PhD work aimed at improving the monitoring techniques and developing novel data processing to improve the data quality. Scintillation measurements are contaminated by multiple scattering encountered by the GNSS signal due to buildings, trees, etc. Such multipath sources need to be identified to keep the quality of the scintillation and TEC data as higher as possible. This can be achieved by removing these sources of errors or mitigating their effects by filtering the data. A novel station characterization technique has been introduced, developed and discussed in this thesis. The results demonstrated that this is a promising method to improve the quality of data (Romano et. al 2013). The results obtained so far motivated the development of the data filtering procedures. The filtering was aimed at filtering-out spurious, noisy data based on general assumptions about statistical data analysis (outlier analysis), thus efficiently removing multipath affected measurements and reducing the data loss with respect to applying a fixed elevation angle cut-off threshold. This is particularly important in case of not well covered regions (e.g. forests, deserts, oceans, etc.), as the field of view spanned by each antenna is optimized. During the PhD activities, the filtering technique has been also tested and validated against real and simulated data. To show how the development of the filtering method is able to efficiently clean multipath and signal degradation from GNSS data, it was applied in two different cases: - First, it was applied to the data published in a climatological study (Alfonsi et al. 2011), carried out with the NGI-INGV GISTM network at high-latitudes. Each station was characterized using the station characterization method, and then the data were filtered using the filtering method. Then, the new climatological maps were generated and compared to the original ones. The percentage of the filtered-out data obtained by applying the standard threshold of 20° on the elevation angle and the filtering technique for each station demonstrated how the latter is able to meaningfully reduce the data loss. The filtering extends the field of view of the network and, then, improves the capability of investigating the dynamics of the ionosphere over larger areas. - Second, the data used in this application were acquired by the CIGALA/CALIBRA network of PolaRxS receivers during the whole year of 2012. The elevation angle cut-off significantly reduced the capability of the network to depict the ionosphere northward of the geomagnetic equator and above the Atlantic Ocean, east of Brazil. This approach limited the data loss to 10-20%, while the traditional cut off of 15°-30° on the elevation angle led to losses of 35-45%. This method not only optimized the capability of GNSS networks, but also helped in planning the installation of additional new receivers aiming to enlarge network coverage in the framework of the CALIBRA project. The enlarged field of view made it possible to identify the increased occurrence of scintillation along the northern crest of the Equatorial Ionospheric Anomaly (EIA). To summarize and to introduce the reader into this thesis, specific issues here addressed are: - Development of software procedures and hardware designs to optimize the station configurations of the existing measurement network of GISTM (GPS Ionospheric Scintillation and TEC Monitor). - Development of techniques for remote, automatic instrument control and setting. - Development of data management tools to achieve quasi real-time data accessibility. - Development of data analysis methods to assess station characterization. - Development of techniques to perform data quality filtering. - Perform acquisition of experimental and simulation data. - Support scientific investigations through the high quality of the NGI-INGV network data.

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Kinrade, Joe. « Ionospheric imaging and scintillation monitoring in the Antarctic and Arctic ». Thesis, University of Bath, 2014. https://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.619217.

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Electron density irregularities influence Global Navigation Satellite System (GNSS) signals, manifesting as ionospheric scintillation. Scintillation poses a service risk to safety-critical GNSS applications at high latitudes. It is difficult to predict, as ionospheric instability processes are not yet fully characterised. This research combines the fields of ionospheric imaging and scintillation monitoring, to investigate the causes of scintillation in the Antarctic and Arctic. Results revealed a plasma patch structure above Antarctica, in response to the impact of a solar wind shock front. Measurements from a network of Global Positioning System scintillation receivers across the continent revealed moderate levels of phase scintillation associated with Total Electron Content (TEC) gradients at the patch break-off point. Scintillation was also driven by solar particle precipitation at E and F region altitudes, verified with in situ spectrometers on polar-orbiting satellites. The current receiver coverage in the region provided the Multi-Instrument Data Analysis Software (MIDAS) tomography tool with sufficient data to track the lifetime of the plasma patch without a convection model. A second experiment was performed at the South Pole, using a collocated GPS scintillation receiver and auroral imager. This allowed simultaneous line-of-sight tracking of GPS signals through the optical auroral emissions. Results showed the first statistical evidence that auroral emissions can be used a proxy for ionospheric irregularities causing GPS scintillation. The relationship was strongest during the presence of discrete auroral arcs. Correlation levels of up to 74% were found over periods of 2-3 hours. The use of multiple emission wavelengths provided basic altitude discrimination. Current capability of ionospheric TEC mapping in the Arctic was tested, where GPS receiver distribution is extensive compared to present Antarctic coverage. Analysis of the ionosphere’s response to a storm event revealed a sequential picture of polar cap patch activity, without the aid of plasma convection modelling. The electron density enhancements of the auroral oval were imaged in completeness for the first time using GPS tomography. Reconstructions were verified using ultraviolet auroral imagery from polar-orbit satellites, and vertical profiles from an incoherent scatter radar.

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Livres sur le sujet "Scintillation-Ionospheric"

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M, Goodman John, Naval Research Laboratory (U.S.), United States. Defense Communications Agency. et United States. Defense Nuclear Agency., dir. Effect of the ionosphere on C³I systems : Based on Ionospheric Effects Symposium held in Old Town, Alexandria, Va., 1-3 May 1984. [Washington, D.C.?] : Naval Research Laboratory, 1985.

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M, Goodman John, et Naval Research Laboratory (U.S.), dir. The effect of the ionosphere on communication, navigation, and surveillance systems : Based on Ionospheric Effects Symposium, 5-7 May 1987. [Washington, DC : Naval Research Laboratory], 1988.

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Chapitres de livres sur le sujet "Scintillation-Ionospheric"

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Liu, Dun, Zhongxin Deng, Jian Feng et Weimin Zhen. « A Study of Ionospheric Scintillation Effects on Differential GNSS ». Dans Lecture Notes in Electrical Engineering, 335–46. Berlin, Heidelberg : Springer Berlin Heidelberg, 2012. http://dx.doi.org/10.1007/978-3-642-29187-6_33.

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Aon, E. F., Y. H. Ho, A. R. Othman et R. Q. Shaddad. « Modeling of GPS Ionospheric Scintillation Using Nonlinear Regression Technique ». Dans Recent Trends in Information and Communication Technology, 180–88. Cham : Springer International Publishing, 2017. http://dx.doi.org/10.1007/978-3-319-59427-9_20.

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Pan, Lijing, et Ping Yin. « Analysis of Polar Ionospheric Scintillation Characteristics Based on GPS Data ». Dans Lecture Notes in Electrical Engineering, 11–18. Berlin, Heidelberg : Springer Berlin Heidelberg, 2014. http://dx.doi.org/10.1007/978-3-642-54737-9_2.

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Huang, Jihong, Xingqun Zhan et Rong Yang. « Comprehensive BDS-3 Signal Simulating for Strong Ionospheric Scintillation Studies ». Dans Proceedings of the International Conference on Aerospace System Science and Engineering 2020, 369–86. Singapore : Springer Singapore, 2021. http://dx.doi.org/10.1007/978-981-33-6060-0_26.

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Lin, Tao, et Gérard Lachapelle. « Demonstration of Signal Tracking and Scintillation Monitoring Under Equatorial Ionospheric Scintillation with a Multi-Frequency GNSS Software Receiver ». Dans Lecture Notes in Electrical Engineering, 775–86. Berlin, Heidelberg : Springer Berlin Heidelberg, 2014. http://dx.doi.org/10.1007/978-3-642-54737-9_67.

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Liu, Dun, Xiao Yu, Jian Feng et Weimin Zhen. « Modeling of BDS Positioning Errors Due to Ionospheric Scintillation and Its Application ». Dans Lecture Notes in Electrical Engineering, 3–15. Singapore : Springer Singapore, 2020. http://dx.doi.org/10.1007/978-981-15-3711-0_1.

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Ruan, Hang, Birong Xu, Lei Zhang et Feng Liu. « An Improved Adaptive Kalman Filter Carrier Phase Locking Loop Under Ionospheric Scintillation ». Dans Lecture Notes in Electrical Engineering, 583–94. Singapore : Springer Singapore, 2016. http://dx.doi.org/10.1007/978-981-10-0934-1_50.

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Fang, Zhenlong, Wenfeng Nie, Tianhe Xu, Zhizhao Liu et Shiwei Yu. « Accuracy Assessment and Improvement of GNSS Precise Point Positioning Under Ionospheric Scintillation ». Dans Lecture Notes in Electrical Engineering, 400–411. Singapore : Springer Singapore, 2019. http://dx.doi.org/10.1007/978-981-13-7759-4_36.

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Gwal, A. K., Suryanshu Choudhary et Ritesh Yadav. « Study of Positional Error on Ionospheric Scintillation Over Antarctic Region and Loss due to Locking of GPS signal ». Dans Earth and Environmental Sciences Library, 189–205. Cham : Springer International Publishing, 2022. http://dx.doi.org/10.1007/978-3-030-87078-2_12.

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Camps, Adriano, Carlos Molina, Guillermo González-Casado, José Miguel Juan, Joël Lemorton, Vincent Fabbro, Aymeric Mainvis, José Barbosa et Raúl Orús-Pérez. « Ionospheric Scintillation Models : An Inter-Comparison Study Using GNSS Data ». Dans Ionosphere - New Perspectives. IntechOpen, 2023. http://dx.doi.org/10.5772/intechopen.1001077.

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Existing climatological ionosphere models, e.g. GISM, SCIONAV, WBMOD and STIPEE, have known limitations that prevent their wide use. In the framework of ESA study “Radio Climatolo-gy Models of the Ionosphere: Status and Way Forward” their performance was assessed using experimental observations of ionospheric scintillation collected over the past years to evaluate their ability to properly support future missions, and eventually indicate their weaknesses for fu-ture improvements. Model limitations are more important in terms of the intensity scintillation parameter (S4). To improve them, the COSMIC model has been fit (scaling factor and offset) to the measured data, and it became the one better predicting the intensity scintillation in a statistical sense.

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Actes de conférences sur le sujet "Scintillation-Ionospheric"

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Sun, Xiyan, Zheyang Zhang, Yuanfa Ji, Suqing Yan, Wentao Fu et Qidong Chen. « Algorithm of Ionospheric Scintillation Monitoring ». Dans 2018 7th International Conference on Digital Home (ICDH). IEEE, 2018. http://dx.doi.org/10.1109/icdh.2018.00053.

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de Paula, E. R., A. A. Pallaoro, P. M. Kintner, T. L. Beach, H. Kil, I. J. Kantor, J. H. A. Sobral, I. S. Batista, M. A. Abdu et F. C. de Oliveira. « Ionospheric Scintillation Effects On Dg Positioning ». Dans 6th International Congress of the Brazilian Geophysical Society. European Association of Geoscientists & Engineers, 1999. http://dx.doi.org/10.3997/2214-4609-pdb.215.sbgf171.

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Groves, K., C. S. Carrano, C. Bridgwood et R. G. Caton. « Longitudinal Differences in Ionospheric Scintillation Characteristics ». Dans 13th International Congress of the Brazilian Geophysical Society & EXPOGEF, Rio de Janeiro, Brazil, 26-29 August 2013. Society of Exploration Geophysicists and Brazilian Geophysical Society, 2013. http://dx.doi.org/10.1190/sbgf2013-393.

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« Ionospheric Scintillation Diagnostics Using LOFAR Interferometer ». Dans 2018 2nd URSI Atlantic Radio Science Meeting (AT-RASC). IEEE, 2018. http://dx.doi.org/10.23919/ursi-at-rasc.2018.8471397.

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Camps, A., H. Park, J. M. Juan, J. Sanz, G. Gonzalez-Casado, J. Barbosa, V. Fabbro, J. Lemorton et R. Orus. « Ionospheric Scintillation Monitoring Using GNSS-R ? » Dans IGARSS 2018 - 2018 IEEE International Geoscience and Remote Sensing Symposium. IEEE, 2018. http://dx.doi.org/10.1109/igarss.2018.8519088.

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Li, YuanHao, Cheng Hu, XiChao Dong, Tao Zeng, Teng Long, LiXiang Ma et XiaoPeng Yang. « Impacts of ionospheric scintillation on geosynchronous SAR ». Dans IGARSS 2015 - 2015 IEEE International Geoscience and Remote Sensing Symposium. IEEE, 2015. http://dx.doi.org/10.1109/igarss.2015.7326640.

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Gulati, Ishita, Jyoti Kumar Atul, Oleg V. Kravchenko et Satnam Dlay. « Statistical Scintillation Indices in Polar Ionospheric Climatology ». Dans 2022 3rd URSI Atlantic and Asia Pacific Radio Science Meeting (AT-AP-RASC). IEEE, 2022. http://dx.doi.org/10.23919/at-ap-rasc54737.2022.9814188.

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Ahmed, Arslan, Rajesh Tiwari, Madad Ali Shah et Jiachen Yin. « GPS receiver phase jitter during ionospheric scintillation ». Dans 2016 7th International Conference on Mechanical and Aerospace Engineering (ICMAE). IEEE, 2016. http://dx.doi.org/10.1109/icmae.2016.7549611.

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Freitas, Moisés J. S., Alison O. Moraes, Emanoel Costa, Marcos R. O. A. Máximo et Clodoaldo De S. Faria. « Ionospheric scintillation simulation based on neural networks ». Dans IEEE EUROCON 2023 - 20th International Conference on Smart Technologies. IEEE, 2023. http://dx.doi.org/10.1109/eurocon56442.2023.10198940.

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Sward, William S., Taylor Swanson et McKay Williams. « Scintillation Simulator Test Results : Hardware-in-the-Loop Emulation of Ionospheric Scintillation ». Dans 2014 IEEE Military Communications Conference (MILCOM). IEEE, 2014. http://dx.doi.org/10.1109/milcom.2014.226.

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Rapports d'organisations sur le sujet "Scintillation-Ionospheric"

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Tripathi, Nitin K. Research of Ionospheric Scintillation in Asia (RISA). Fort Belvoir, VA : Defense Technical Information Center, mars 2014. http://dx.doi.org/10.21236/ada604082.

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Brown, Alison, Eric Holm et Keith Groves. GPS Ionospheric Scintillation Measurements Using a Beam Steering Antenna Array for Improved Signal/Noise. Fort Belvoir, VA : Defense Technical Information Center, janvier 2006. http://dx.doi.org/10.21236/ada444478.

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Tuley, M. T., T. C. Miller et R. J. Sullivan. Ionospheric Scintillation Effects on a Space-Based, Foliage Penetration, Ground Moving Target Indication Radar. Fort Belvoir, VA : Defense Technical Information Center, août 2001. http://dx.doi.org/10.21236/ada407771.

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Kersley, L., et I. K. Walker. Total Electron Content and Scintillation in the Vicinity of the Main Ionospheric through Over Northern Europe. Fort Belvoir, VA : Defense Technical Information Center, juin 1991. http://dx.doi.org/10.21236/ada241205.

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Secan, James A. An Investigation of Methods for Updating Ionospheric Scintillation Models Using Topside In-Situ Plasma Density Measurements. Fort Belvoir, VA : Defense Technical Information Center, mai 1991. http://dx.doi.org/10.21236/ada243378.

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Keskinen, Michael J., et Per A. Kullstam. Preliminary Composite Channel Model for the Mobile User Objective System Including Ionospheric Scintillation and Terrestrial Multipath Effects. Fort Belvoir, VA : Defense Technical Information Center, septembre 2004. http://dx.doi.org/10.21236/ada426698.

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Comberiate, Joseph M. Space-Based Three-Dimensional Imaging of Equatorial Plasma Bubbles : Advancing the Understanding of Ionospheric Density Depletions and Scintillation. Fort Belvoir, VA : Defense Technical Information Center, mars 2012. http://dx.doi.org/10.21236/ada567064.

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