Academic literature on the topic 'GNSS-2'
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Journal articles on the topic "GNSS-2"
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Wang, Xia Jun, Dong Lin Zhao, Dong Dong Zhang, Cheng Li, and Ran Ran Yao. "Remarkable Mechanical and Thermal Increments of Epoxy Composites by Graphene Nanosheets and Carbon Nanotubes Synergetic Reinforcement." Key Engineering Materials 727 (January 2017): 546–52. http://dx.doi.org/10.4028/www.scientific.net/kem.727.546.
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Graphene nanosheets (GNSs) were modified with aqueous ammonia and hydrogen peroxide, to obtain amine (–NH2) functionalized GNSs (AFGNSs) and enhance the bondings between the GNSs and epoxy matrix. We report an easy and efficient approach to improve the mechanical properties and thermal conductivity of epoxy matrix composites by combining one dimensional multi-walled carbon nanotubes and two dimensional AFGNSs. The long and tortuous MWCNTs can bridge adjacent AFGNSs and inhibit their aggregation, resulting in an increased contact surface area between GNS/MWCNT structures and the polymer. A remarkable synergetic effect between the GNSs and MWCNTs on the enhanced mechanical properties and thermal conductivity of the epoxy composites was demonstrated. The addition of 2 wt.% MWCNT-GNS hybrid fillers improved the tensile strength and flexural strength of the pristine epoxy by 20.71% and 55.51%, respectively. Thermal conductivity increased by 93.71% using MWCNT-GNS hybrid fillers compared to non-derivatised epoxy. This study has demonstrated that 2-D GNSs and 1-D MWCNTs have an obvious synergetic reinforcing effect on the mechanical properties and a remarkable thermal conductivity enhancement in epoxy composites which provides an easy and effective way to design and improve the properties of composite materials.
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Zhao, Qingzhi, Kefei Zhang, and Wanqiang Yao. "Influence of station density and multi-constellation GNSS observations on troposphere tomography." Annales Geophysicae 37, no. 1 (January 14, 2019): 15–24. http://dx.doi.org/10.5194/angeo-37-15-2019.
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Abstract. Troposphere tomography, using multi-constellation observations from global navigation satellite systems (GNSSs), has become a novel approach for the three-dimensional (3-D) reconstruction of water vapour fields. An analysis of the integration of four GNSSs (BeiDou, GPS, GLONASS, and Galileo) observations is presented to investigate the impact of station density and single- and multi-constellation GNSS observations on troposphere tomography. Additionally, the optimal horizontal resolution of the research area is determined in Hong Kong considering both the number of voxels divided, and the coverage rate of discretized voxels penetrated by satellite signals. The results show that densification of the GNSS network plays a more important role than using multi-constellation GNSS observations in improving the retrieval of 3-D atmospheric water vapour profiles. The root mean square of slant wet delay (SWD) residuals derived from the single-GNSS observations decreased by 16 % when the data from the other four stations are added. Furthermore, additional experiments have been carried out to analyse the contributions of different combined GNSS data to the reconstructed results, and the comparisons show some interesting results: (1) the number of iterations used in determining the weighting matrices of different equations in tomography modelling can be decreased when considering multi-constellation GNSS observations and (2) the reconstructed quality of 3-D atmospheric water vapour using multi-constellation GNSS data can be improved by about 11 % when compared to the SWD estimated with precise point positioning, but this was not as high as expected.
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Schweikert, Robert, Thomas W�rz, Riccardo De Gaudenzi, Alexander Steingass, and Armin Dammann. "On signal structures for GNSS-2." International Journal of Satellite Communications 18, no. 4-5 (2000): 271–91. http://dx.doi.org/10.1002/1099-1247(200007/10)18:4/5<271::aid-sat658>3.0.co;2-y.
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Guler, Omer, Yakup Say, and Burak Dikici. "The effect of graphene nano-sheet (GNS) weight percentage on mechanical and corrosion properties of AZ61 and AZ91 based magnesium matrix composites." Journal of Composite Materials 54, no. 28 (June 19, 2020): 4473–85. http://dx.doi.org/10.1177/0021998320933345.
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In this study, the effect of graphene nano-sheets (GNSs) on mechanical and corrosion properties of AZ61 and AZ91 based composites was investigated, detail. GNSs have been successfully produced by the liquid phase exfoliation (LPE) method and then, added AZ61 and AZ91 matrix with 01, 0.2, and 0.5 wt% GNSs for the production of the composites. The composite compacts were produced by powder metallurgy technique and sintered for 2 h at 500 °C under Ar atmosphere. The composite characterizations were carried out by scanning and transmission electron microscopes (SEM, TEM), electron dispersive spectroscope (EDS), Raman spectroscopy, and X-ray diffraction. The mechanical properties and corrosion behaviors of the composites have been compared with compression tests and potentiodynamic scanning (PDS) techniques, respectively. The results showed that the compressive strength of the composites increased with increasing GNS amount in both the AZ61 and AZ91 matrix alloys. The most susceptible composites to corrosion for both AZ61 and AZ91 matrix were observed in the 0.5 wt% GNS containing structures. However, there is a certain ratio of GNS in the Mg matrix to achieve good corrosion resistance.
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González, Emilio, Celso Prados, Virginia Antón, and Boris Kennes. "GRAIL-2: Enhanced Odometry based on GNSS." Procedia - Social and Behavioral Sciences 48 (2012): 880–87. http://dx.doi.org/10.1016/j.sbspro.2012.06.1065.
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Zhang, Jinglei, Xiaoming Wang, Zishen Li, Shuhui Li, Cong Qiu, Haobo Li, Shaotian Zhang, and Li Li. "The Impact of Different Ocean Tide Loading Models on GNSS Estimated Zenith Tropospheric Delay Using Precise Point Positioning Technique." Remote Sensing 12, no. 18 (September 20, 2020): 3080. http://dx.doi.org/10.3390/rs12183080.
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Global navigation satellite systems (GNSSs) have become an important tool to derive atmospheric products, such as the total zenith tropospheric delay (ZTD) and precipitable water vapor (PWV) for weather and climate studies. The ocean tide loading (OTL) effect is one of the primary errors that affects the accuracy of GNSS-derived ZTD/PWV, which means the study and choice of the OTL model is an important issue for high-accuracy ZTD estimation. In this study, GNSS data from 1 January 2019 to 31 January 2019 are processed using precise point positioning (PPP) at globally distributed stations. The performance of seven widely used global OTL models is assessed and their impact on the GNSS-derived ZTD is investigated by comparing them against the ZTD calculated from co-located radiosonde observations. The results indicate that the inclusion or exclusion of the OTL effect will lead to a difference in ZTD of up to 3–15 mm for island stations, and up to 1–2 mm for inland stations. The difference of the ZTD determined with different OTL models is quite small, with a root-mean-square (RMS) value below 1.5 mm at most stations. The comparison between the GNSS-derived ZTD and the radiosonde-derived ZTD indicates that the adoption of OTL models can improve the accuracy of GNSS-derived ZTD. The results also indicate that the adoption of a smaller cutoff elevation, e.g., 3° or 7°, can significantly reduce the difference between the ZTDs determined by GNSS and radiosonde, when compared against a 15° cutoff elevation. Compared to the radiosonde-derived ZTD, the RMS error of GNSS-derived ZTD is approximately 25–35 mm at a cutoff elevation of 15°, and 15–25 mm when the cutoff elevation is set to 3°.
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Calabia, Andres, Iñigo Molina, and Shuanggen Jin. "Soil Moisture Content from GNSS Reflectometry Using Dielectric Permittivity from Fresnel Reflection Coefficients." Remote Sensing 12, no. 1 (January 1, 2020): 122. http://dx.doi.org/10.3390/rs12010122.
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Global Navigation Satellite Systems-Reflectometry (GNSS-R) has shown unprecedented advantages to sense Soil Moisture Content (SMC) with high spatial and temporal coverage, low cost, and under all-weather conditions. However, implementing an appropriated physical basis to estimate SMC from GNSS-R is still a challenge, while previous solutions were only based on direct comparisons, statistical regressions, or time-series analyses between GNSS-R observables and external SMC products. In this paper, we attempt to retrieve SMC from GNSS-R by estimating the dielectric permittivity from Fresnel reflection coefficients. We employ Cyclone GNSS (CYGNSS) data and effectively account for the effects of bare soil roughness (BSR) and vegetation optical depth by employing ICESat-2 (Ice, Cloud, and land Elevation Satellites 2) and/or SMAP (Soil Moisture Active Passive) products. The tests carried out with ICESat-2 BSR data have shown the high sensitivity in SMC retrieval to high BSR values, due to the high sensitivity of ICESat-2 to land surface microrelief. Our GNSS-R SMC estimates are validated by SMAP SMC products and the results provide an R-square of 0.6, Root Mean Squared Error (RMSE) of 0.05, and a zero p-value, for the 4568 test points evaluated at the eastern region of China during April 2019. The achieved results demonstrate the optimal capability and potential of this new method for converting reflectivity measurements from GNSS-R into Land Surface SMC estimates.
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Smoliarova, T. E. "Synthesis, properties and functionalization of gold nanostars for medical diagnostics." Siberian Medical Review, no. 2 (2021): 97–99. http://dx.doi.org/10.20333/25000136-2021-2-97-99.
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Th e aim of the research. To evaluate two approaches to colloidal synthesis using two diff erent non-toxic surfactants (PVP and Triton X-100) and their properties for future use. Material and methods. (PVP) Th e solution of GNSs with short tips was prepared in 200 ml vial. 20 mg of PVP (Polyvinylpyrrolidone, 1-ethenylpyrrolidin-2-one) were dissolved in the 200 mL of DMF (N,N-Dimethylmethanamide) (with the sonication to dissolve well). (Triton X-100) In a typical preparation of GNSs with long tips, the seed solution was prepared in a 20mL vial: 5mL of HAuCl4 5∙10-4M in water are added to 5mL of an aqueous solution of TritonX-100 0.1M. To examinate the shape and properties of prepared gold nanostars Cary 100 Bio Spectrophotometer using quartz cuvettes was used to taken on UV-Vis spectra. Transmission Electron Microscopy (TEM) was used to obtain shape and size of prepared GNSs. Results. Microscopy analysis shows that the obtained GNSs have completely diff erent shapes. Th e GNSs fabricated using synthesis approach with PVP have shorter tips and the cores are larger than the GNSs synthesized with Triton X-100 synthesis approach. TEM-images of the second ones show smaller size nanoparticles with the longer and thinner tips. Optical properties of the synthesized GNSs were analyzed using UV-vis-NIR absorbtion spectra, which shows maximum plasmon existence at 800 nm for GNSs synthesized with PVP and at 850 nm for GNSs synthesized with Triton X-100. Conclusion. In summary, we developed GNSs using two colloidal synthesis approaches with the use of two diff erent non-toxic surfactants (PVP and Triton X-100). In the future, gold nanostars are planned to be used to develop highly sensitive methods of medical diagnostics.
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Kačmařík, Michal, Jan Douša, Galina Dick, Florian Zus, Hugues Brenot, Gregor Möller, Eric Pottiaux, et al. "Inter-technique validation of tropospheric slant total delays." Atmospheric Measurement Techniques 10, no. 6 (June 12, 2017): 2183–208. http://dx.doi.org/10.5194/amt-10-2183-2017.
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Abstract. An extensive validation of line-of-sight tropospheric slant total delays (STD) from Global Navigation Satellite Systems (GNSS), ray tracing in numerical weather prediction model (NWM) fields and microwave water vapour radiometer (WVR) is presented. Ten GNSS reference stations, including collocated sites, and almost 2 months of data from 2013, including severe weather events were used for comparison. Seven institutions delivered their STDs based on GNSS observations processed using 5 software programs and 11 strategies enabling to compare rather different solutions and to assess the impact of several aspects of the processing strategy. STDs from NWM ray tracing came from three institutions using three different NWMs and ray-tracing software. Inter-techniques evaluations demonstrated a good mutual agreement of various GNSS STD solutions compared to NWM and WVR STDs. The mean bias among GNSS solutions not considering post-fit residuals in STDs was −0.6 mm for STDs scaled in the zenith direction and the mean standard deviation was 3.7 mm. Standard deviations of comparisons between GNSS and NWM ray-tracing solutions were typically 10 mm ± 2 mm (scaled in the zenith direction), depending on the NWM model and the GNSS station. Comparing GNSS versus WVR STDs reached standard deviations of 12 mm ± 2 mm also scaled in the zenith direction. Impacts of raw GNSS post-fit residuals and cleaned residuals on optimal reconstructing of GNSS STDs were evaluated at inter-technique comparison and for GNSS at collocated sites. The use of raw post-fit residuals is not generally recommended as they might contain strong systematic effects, as demonstrated in the case of station LDB0. Simplified STDs reconstructed only from estimated GNSS tropospheric parameters, i.e. without applying post-fit residuals, performed the best in all the comparisons; however, it obviously missed part of tropospheric signals due to non-linear temporal and spatial variations in the troposphere. Although the post-fit residuals cleaned of visible systematic errors generally showed a slightly worse performance, they contained significant tropospheric signal on top of the simplified model. They are thus recommended for the reconstruction of STDs, particularly during high variability in the troposphere. Cleaned residuals also showed a stable performance during ordinary days while containing promising information about the troposphere at low-elevation angles.
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Wang, Jue-yao, and Bin Liang. "4-GNSS radio occultation satellite constellation design based on Dual-gate uniformity evaluation index." Proceedings of the Institution of Mechanical Engineers, Part G: Journal of Aerospace Engineering 231, no. 1 (November 13, 2016): 3–16. http://dx.doi.org/10.1177/0954410016674746.
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A brand-new area of low earth orbit satellite constellation research has been expanded by global navigation satellite system (GNSS) radio occultation (RO) atmosphere sounding technology in the last decade. The possibility of reducing the sounding satellites while keeping the amount of atmosphere soundings increasing to produce low-cost meteorological data product is investigated, and a constellation capable of receiving the RO signals from all the 4-GNSS, such as GPS, GLONASS, Galileo, and Compass, is proposed in this paper. This paper focuses on the mathematical problems on the design of 4-GNSS RO satellite constellation. A forward GNSS RO sounding simulation algorithm based on ideal atmosphere model and two-dimensional radial tracing algorithm is presented for a rapidly and accurately sounding performance prediction of 4-GNSS RO satellite constellations. Then, an improved uniformity evaluation factor named Dual-gate is established for 4-GNSS RO satellite constellation optimization design, which is a combination of the uniformity evaluation factors for the latitudinal distribution of RO soundings and those for the gridding uniformity. On the basis of low earth orbit satellite orbit dynamics and spherical geometry, the impacts of partial constellation parameters on the amount and coverage performance accorded with Dual-gate uniformity evaluation index are derived, and a series of design criteria of 4-GNSS RO satellite constellation are summarized. A simplified 4-GNSS RO satellite constellation model is built on the basis of the design criteria, and an improved ant colony algorithm is used to optimize the parameters of a 4-GNSS RO constellation including as many satellites as COSMIC-2. The simulation result shows that this 4-GNSS RO constellation is capable of obtaining near 3000 atmosphere soundings per 3 h. It obtains 13% more soundings than COSMIC-2 with the same 4-GNSS RO sounding devices, and the uniformity of soundings is increased by 9%.
Dissertations / Theses on the topic "GNSS-2"
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Su, Hua. "Precise orbit determination of global navigation satellite system of second generation (GNSS-2) orbit determination of IGSO, GEO and MEO satellites /." [S.l.] : [s.n.], 2000. http://deposit.ddb.de/cgi-bin/dokserv?idn=962099635.
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Cheng, Cheng. "GNSS Multipath and Interference Mitigation Using Bayesian Methods." Thesis, Toulouse, ISAE, 2015. http://www.theses.fr/2015ESAE0011.
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Les récepteurs GNSS sont utilisés pour estimer la position et la vitesse d’un véhicule à partir de signauxtransmis par des satellites. L’estimation est habituellement réalisée en plusieurs étapes. Lesparamètres des signaux qui concernent le délai de propagation, la phase et la fréquence Dopplerde la porteuse, sont estimés et exploités pour estimer des mesures de pseudo-distances et de delta-distances.Ces mesures sont ensuite utilisées comme observation de la position et de la vitesse parl’algorithme de navigation qui délivre l’état du véhicule. En environnement GNSS dégradé les signauxémis par les satellites GPS peuvent subir des réflexions, des réfractions, et suivre ainsi deschemins multiples, communément connus sous le nom de multi-trajets. Ces signaux induisent desdéformations du signal à différents niveaux dans les récepteurs. En particulier il en résulte une distorsiondes fonctions de corrélation et des fonctions de discrimination, ce qui conduit à des erreursdans les estimées de pseudo-distances et de delta-distances et, en conséquence, à une erreur depositionnement. Bénéficiant d’un état de l’art des approches développées pour l’atténuation deseffets des interférences, de nouvelles techniques sont proposées dans cette thèse afin de réduirel’impact des MT sur les performances des récepteurs, et d’améliorer ainsi la précision de positionnementGPSGlobal Navigation Satellite Systems (GNSS) receivers calculate the user position, velocity and timeby using the signals received from a set of navigation satellites. In constricted environments, suchas urban canyons or other intensive obstruction scenarios, the signal transmitted by the satelliteis subject to reflection or diffraction and can follow different paths, commonly known as multipath(MP) interferences, before arriving at the antenna of the GNSS receiver. The MP interferencesaffect the signal processing results at different stages in the receiver. For instance, MP signals modifythe correlation and discriminator functions and can introduce errors in pseudo-range (PR) andcarrier phase measurements, resulting finally in GNSS-based positioning errors. Therefore the MPinterference can be considered as a dominant error source in these complex situations. This thesisinvestigates MP mitigation techniques based on signal processing methods at different stages ofthe GNSS receiver. By analyzing and comparing the state-of-the-art MP mitigation approaches, innovativeMP mitigation techniques are proposed in order to reduce the impact of MP interferenceson the GNSS receiver, and to improve the positioning accuracy based on GNSS
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Bin, Syed Mohd Dardin Syed Mohd Fairuz. "Étude d'algorithmes de poursuite du signal GNSS permettant d'améliorer le positionnement en environnement urbain." Thesis, Toulouse, ISAE, 2015. http://www.theses.fr/2015ESAE0008/document.
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Cette activité de recherche concerne le domaine de la navigation par satellite qui utilise lessystèmes GNSS (Global Navigation Satellite Systems). Elle vise à améliorer les performances globalesd’un système de navigation, c’est à dire la robustesse, la disponibilité et l’intégrité d’un récepteurutilisant les signaux GNSS pour élaborer sa position et sa vitesse. L’enjeu est important et on noteque les représentations des nouveaux signaux proposés pour GPS et GALILEO visent à diminuer lacorrélation entre les signaux, faciliter la poursuite de ces signaux en abaissant le niveau des seuils depoursuite, réduire l’effet des interférences. La navigation basée sur les signaux GNSS reste toutefoisdépendante du canal de propagation et est particulièrement affectée en cas réflexion, réfraction,diffraction, diffusion, et de blocage du signal émis par le satellite. Il en résulte une dégradationimportante des performances en environnement urbain. L’objectif de cette recherche est ainsi deproposer, d’analyser et de caractériser des architectures de récepteur robuste, permettantd’adresser efficacement le problème de la navigation dans des environnements difficiles où le signalGNSS est affecté par de fortes perturbations. De nombreux travaux de recherche visant à améliorer les performances des algorithmes de poursuite du signal au sein d’un récepteur ont été conduites, en particulier pour adresser leproblème de cette poursuite dans des environnements difficiles, en présence de multi-trajets. Lesapproches les plus connues traitent le signal de post-corrélation. Ainsi l’utilisation de corrélateursétroits permet de réduire l’impact des multi-trajets générant un retard important. De même destechniques utilisant un banc de corrélateurs pour estimer les paramètres des multi-trajets ont étéétudiées. La présence de multi-trajets demeure toutefois une importante source d’erreur pour desrécepteurs opérant en environnement urbain. L’amélioration des performances des récepteurs dansce contexte reste un enjeu important et de nombreuses études sont conduites en vue d’améliorer ladisponibilité, la robustesse, la fiabilité et l’intégrité de ces récepteurs. Le principal objectif de cette thèse est de proposer une architecture de poursuite adaptive exploitant des techniques de poursuite vectorielle (Vector Tracking Loop – VTL). Les récepteurs conventionnels utilisent une architecture directe où une poursuite scalaire du signal (Scalar TrackingLoop – STL) est réalisée en amont du navigateur. Cette architecture n’utilise pas les informationsélaborées par le navigateur pour améliorer les performances de la poursuite. Au contrairel’architecture vectorielle permet à la poursuite de bénéficier de la connaissance de la position et dela vitesse estimées par le récepteur. Il peut en résulter une dégradation de la poursuite lorsque le navigateur ne sait pas isoler une mesure contaminée. Cet architecture rend donc les performances d’un canal très dépendantes des mesures utilisées par le navigateur, et donc en particulier des autres canaux. L’approche qui est explorée ici vise à combiner les approches de poursuite STL et VTL pour améliorer les performances des récepteurs en environnement urbain, dans un contexte multiconstellationPresent research activities in the field of Global Navigation Satellite Systems (GNSS) aim atenhancing the overall navigation performance by providing better and more robust navigationsignals compared the ones available today. These GNSS signals are designed to provide betterimproved cross-correlation protection, lower tracking thresholds and reduced susceptibility tonarrow band interferences. However navigation based on GNSS signals remains sensitive topropagation impairments such as reflection, refraction, diffraction and scattering, and sometimesblockage of the line of sight signals. These effects are especially important in urban environment.Therefore, a better and more robust receiver design and implementation is crucial to meet anappropriate navigation performance using GNSS signals. Improving signal tracking algorithms inside the receiver is an attractive approach. This is particularly true in the case of urban environments where interference and multipath severely degrade the performance of the GPS positioning. Despite the many efforts of performance enhancement, multipath still remains as the dominant source of error and the limiting factor for many applications. Consequently improving the performance of a receiver in multipath environment is a great challenge and many studies are carried out to satisfy the above requirements in term of availability, reliability and integrity. The main goal of this PhD thesis is to propose a new adaptive tracking algorithm based on vector tracking loop (VTL) approach. Currently, the conventional technique (i.e., Scalar Tracking Loop (STL)) is implemented in a forward-only strategy which doesn’t exploit the position, velocity and time (PVT) solution provided by the Navigation System (NS). Standard VTL on the other hand, suffers from measurements contamination from the exploitation of PVT provided by the NS. This adaptiveapproach will take advantage of both tracking methods for providing reliable measurements in amulti-constellation context
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Flohrer, Claudia. "Mutual validation of satellite-geodetic techniques and its impact on GNSS orbit modeling /." Bern : [s.n.], 2008. http://www.ub.unibe.ch/content/bibliotheken_sammlungen/sondersammlungen/dissen_bestellformular/index_ger.html.
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Kbayer, Nabil. "Advanced Signal Processing Methods for GNSS Positioning with NLOS/Multipath Signals." Thesis, Toulouse, ISAE, 2018. http://www.theses.fr/2018ESAE0017/document.
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Les avancées récentes dans le domaine de navigation par satellites (GNSS) ontconduit à une prolifération des applications de géolocalisation dans les milieux urbains. Pourde tels environnements, les applications GNSS souffrent d’une grande dégradation liée à laréception des signaux satellitaires en lignes indirectes (NLOS) et en multitrajets (MP). Cetravail de thèse propose une méthodologie originale pour l’utilisation constructive des signauxdégradés MP/NLOS, en appliquant des techniques avancées de traitement du signal ou àl’aide d’une assistance d’un simulateur 3D de propagation des signaux GNSS. D’abord, nousavons établi le niveau maximal réalisable sur la précision de positionnement par un systèmeGNSS "Stand-Alone" en présence de conditions MP/NLOS, en étudiant les bornes inférieuressur l’estimation en présence des signaux MP/NLOS. Pour mieux améliorer ce niveau deprécision, nous avons proposé de compenser les erreurs NLOS en utilisant un simulateur 3D dessignaux GNSS afin de prédire les biais MP/NLOS et de les intégrer comme des observationsdans l’estimation de la position, soit par correction des mesures dégradées ou par sélectiond’une position parmi une grille de positions candidates. L’application des approches proposéesdans un environnement urbain profond montre une bonne amélioration des performances depositionnement dans ces conditionsRecent trends in Global Navigation Satellite System (GNSS) applications inurban environments have led to a proliferation of studies in this field that seek to mitigatethe adverse effect of non-line-of-sight (NLOS). For such harsh urban settings, this dissertationproposes an original methodology for constructive use of degraded MP/NLOS signals, insteadof their elimination, by applying advanced signal processing techniques or by using additionalinformation from a 3D GNSS simulator. First, we studied different signal processing frameworks,namely robust estimation and regularized estimation, to tackle this GNSS problemwithout using an external information. Then, we have established the maximum achievablelevel (lower bounds) of GNSS Stand-Alone positioning accuracy in presence of MP/NLOSconditions. To better enhance this accuracy level, we have proposed to compensate for theMP/NLOS errors using a 3D GNSS signal propagation simulator to predict the biases andintegrate them as observations in the estimation method. This could be either by correctingdegraded measurements or by scoring an array of candidate positions. Besides, new metricson the maximum acceptable errors on MP/NLOS errors predictions, using GNSS simulations,have been established. Experiment results using real GNSS data in a deep urban environmentshow that using these additional information provides good positioning performance enhancement,despite the intensive computational load of 3D GNSS simulation
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Andrianarison, Maherizo. "New Methods and Architectures for High Sensitivity Hybrid GNSS Receivers in Challenging Environments." Thesis, Toulouse, ISAE, 2018. http://www.theses.fr/2018ESAE0016/document.
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Les systèmes de navigation par satellites GNSS ne cessent d’évoluer et ils sont déjà utilisés dans de nombreuses applications. Avec la venue des nouveaux systèmes Galileo et BeiDou ainsi que la modernisation des systèmes GPS et GLONASS, de nouveaux satellites ainsi que de nombreuses nouvelles fréquences et de nouveaux signaux feront leur apparition dans les prochaines années et qui vont encore ouvrir la porte à d’innombrables nouvelles applications. L’évolution rapide de la téléphonie mobile nécessite une meilleure exploitation des systèmes de navigation et de positionnement dans les environnements urbains.Jusqu'à maintenant, les signaux de navigation GPS ne peuvent pas être bien captés dans les environnements urbains. Les niveaux des signaux y sont très faibles et il est presque impossible d’acquérir et de poursuivre les signaux de façon autonome à cause de l'importance des obstacles. De plus, le positionnement à l’intérieur et dans les environnements urbains sont aussi soumis aux problèmes de multi-trajets, de masquage, d’interférences et de brouillages. Dans ces conditions, il faut pouvoir traiter des signaux très dégradés ou très courts qui ne permettent pas au récepteur d’effectuer le processus de poursuite. Ainsi, cela nous conduit à la nécessité de repenser l'architecture du récepteur GNSS pour les applications modernes.Ce projet de thèse consiste à développer de nouvelles méthodes et architectures de récepteur GNSS de haute sensibilité et robuste aux dégradations des signaux tout en concevant de nouveaux algorithmes intégrés dans un récepteur GNSS hybride capable de fonctionner dans les environnements urbains profonds ou « intérieurs ».La méthodologie prévoit l’utilisation de la nouvelle approche de « détection collective (CD) » ou « acquisition collaborative ». L'approche collaborative qui traite tous les signaux multi-satellites ouvre une solution intéressante. De nombreuses techniques existent dans la littérature pour résoudre les problèmes de positionnement dans les environnements urbains, mais nous proposons la nouvelle approche de détection collective en raison de sa performance en tant que méthode de positionnement direct et méthode d'acquisition de haute sensibilité, par l'application de la détection vectorielle de tous les satellites visibles. En effet, la bonne combinaison des valeurs de corrélation de plusieurs satellites peut réduire le niveau de C/N0 requis des signaux satellites par les algorithmes standards de traitement (acquisition et poursuite) qui ne peuvent pas être acquis individuellement mais permettent de contribuer de manière constructive à une solution collective de positionnement pour chaque utilisateur. L’objectif est de détecter collaborativement les satellites. La combinaison de différents signaux GNSS peut considérablement augmenter la sensibilité d'acquisition du récepteur. Malgré les avantages de cette approche, elle présente également des inconvénients tels que la charge de calcul élevée en raison du grand nombre de points candidats dans le domaine position/biais d’horloge. Ainsi, le travail proposé dans cette thèse consiste à réduire la complexité du CD en optimisant la recherche de points candidats dans le domaine position/biais d’horloge. Enfin, l'objectif est d'appliquer l'approche de détection collective au positionnement GNSS coopératif pour la navigation moderne dans des environnements difficiles. Pour cela, des algorithmes d'exploitation optimale des ressources du récepteur en sélectionnant les meilleurs satellites ou la station de référence seront développés selon certains critères tels que le niveau du rapport signal sur bruit (C/N_0), l’angle d’élévation des satellites ainsi que la configuration géométrique des satellites visibles. L’objectif final est de proposer une nouvelle architecture de récepteur cognitif de haute sensibilité permettant de recevoir de façon optimale les nouveaux signaux GNSSGNSS satellite navigation systems are constantly evolving and have been already used in many applications. With the advent of the new systems Galileo and BeiDou as well as the modernization of GPS and GLONASS systems, new satellites and numerous new frequencies and signals will appear in the coming years and will open door to countless new applications that are currently impossible. The rapid evolution of mobile telephony and personal navigation devices (PND) requires better use of navigation systems in non-ideal environments, especially the need for positioning in deep urban area. On the one hand, users are waiting for a high positioning accuracy, because of the proximity to various points of interest. On the other hand, urban environment brings specific difficulties in receiving GNSS signals.GNSS navigation signals cannot be properly captured in urban and "indoor" environments. Signal levels are very low and it is almost impossible to acquire and track signals autonomously because of the strong attenuation of signals due to obstacles. In addition, indoor and urban positioning are also subject to multipath problems, masking, interference and jamming. Under these conditions, we must be able to process highly degraded or very short signals that do not allow the receiver to go through the tracking process. Thus, this leads us to the need to rethink the architecture of GNSS receiver for modern applications.This thesis project consists of developing new GNSS methods and architectures of high sensitivity and robustness to signal degradations and designing new algorithms integrated into a hybrid GNSS receiver capable of operating in deep urban environments.The methodology involves the use of the new concept of “Collective Detection (CD)”, also called “collaborative acquisition”. The collaborative approach that treats multi-satellite signals all together opens an interesting solution. Many techniques exist in the literature to solve the problems of positioning in urban environments, but we propose the new Collective Detection approach because of its performance as both a Direct Positioning method, providing a coarse position/clock-bias solution directly from acquisition, and High-Sensitivity acquisition method, by application of vector detection of all satellites in view. Indeed, the correct combination of the correlation values of several satellites can reduce the required Carrier-to-Noise Ratio (C/N_0) level of the satellite signals which cannot be acquired individually by standard signal processing (acquisition and tracking) but make it possible to use them constructively to a positioning solution. The combination of different GNSS signals can considerably increase the acquisition sensitivity of the receiver. Despite the advantages of this approach, it also has drawbacks such as the high computational burden because of the large number of candidate points in the position/clock-bias domain. Thus, the work proposed in this thesis consists of reducing the complexity of the CD by optimizing the search for candidate points in position/clock-bias domain. Finally, the goal is to apply the CD approach to Cooperative GNSS Positioning for modern navigation in harsh environments. For that, algorithms for optimally exploiting receiver resources by selecting the best satellites or the reference station will be developed according to certain criteria such as the C/N_0 level, the elevation angle, and the geometric configuration of the visible satellites. The ultimate goal is to propose a design of a new smart receiver “High Sensitivity Cognitive GNSS Receiver (HS-CGR)” to optimally receive and process GNSS signals
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Katragadda, Mahesh. "Design and Simulation of a Planar Crossed-Dipole Global Navigation Satellite System (GNSS) Antenna in the L1 Frequency Band." Ohio University / OhioLINK, 2012. http://rave.ohiolink.edu/etdc/view?acc_num=ohiou1345227397.
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Škapa, Antonín. "Řízení robotické sekačky trávy." Master's thesis, Vysoké učení technické v Brně. Fakulta elektrotechniky a komunikačních technologií, 2020. http://www.nusl.cz/ntk/nusl-413202.
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This master‘s thesis deals with development and realisation of robotic lawn mower with satelite navigation. It begins with preparation of a platform for outdoor mobile robot navigation and it’s control HW and SW. There are discussed different options of navigation both commercial and experimental. Further on I have chosen the right GNSS receiver based on market research and user experience. The GNSS receiver’s parameters are measured with different antennas. Following with the choice of suitable open-source control unit and it’s software implementation. Furthermore control from a companion computer is described and physical realisation is done. In the end of the thesis activation of the whole mower is performed and described. Lastly there are discussed possible ways of future development.
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Barbiero, Franck. "Antibrouillage de récepteur GNSS embarqué sur hélicoptère." Thesis, Toulouse, ISAE, 2014. http://www.theses.fr/2014ESAE0052.
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En environnements hostiles, les signaux GNSS (Global Navigation Satellite System)peuvent être soumis à des risques de brouillages intentionnels. Basées sur un réseau d'antennes adaptatif, les solutions spatio-temporelles (STAP) ont déjà montré de bonnes performances de réjection des interférences. Toutefois, lorsque le module GNSS est placé sous les pales d'un hélicoptère, des effets non-stationnaires, appelés Rotor Blade Modulation (RBM), créés par les multiples réflexions du signal sur les pales du rotor, peuvent dégrader les techniques usuelles d’antibrouillage. Le signal utile GNSS n’est alors plus accessible. Le travail de la thèse consiste donc à élaborer un système de protection des signaux GNSS adapté à la RBM. Pour cela, un modèle innovant de multitrajets, adapté à ce type de phénomène, a été développé. La comparaison de simulations électromagnétiques représentatives et de mesures expérimentales sur hélicoptère EC-120 a permis de valider ce modèle. Celui-ci permet d'estimer, par maximum de vraisemblance, les paramètres de la contribution non-stationnaire du signal reçu. Enfin, l'association d'un algorithme de filtrage des multitrajets par projection oblique et d'un traitement STAP permet d'éliminer la contribution dynamique puis statique de l'interférence. Les simulations montrent que le signal utile GNSS est alors de nouveau exploitableIn hostile environments, Global Navigation Satellite System (GNSS) can be disturbed by intentional jamming. Using antenna arrays, space-time adaptive algorithm (STAP) isone of the most efficient methods to deal with these threats. However, when a GNSS receiver is placed near rotating bodies, non-stationary effects called Rotor Blade Modulation (RBM) are created by the multipaths on the blades of the helicopter. They can degrade significantly the anti-jamming system and the signal of interest could belost. The work of the thesis is, consequently, to develop a GNSS protection system adapted to the RBM. In this way, an innovative multipath model, adapted to this phenomenon, has been developed. The model is then confirmed by comparison with a symptotic electromagnetic simulations and experiments conducted on an EC-120helicopter. Using a Maximum Likelihood algorithm, the parameters of the non-stationary part of the received signal have been estimated. And finally, the RBM anti-jamming solution, combining oblique projection algorithm and academic STAP, can mitigate dynamic and static contributions of interferences. In the end, the navigation information is available again
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Zoulida, Myriam. "Determination of terrestrial frames by optimal combination of GNSS, DORIS and SLR measurements." Sorbonne Paris Cité, 2016. http://www.theses.fr/2016USPCC050.
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L'approche actuelle pour la réalisation du Repère Terrestre International de Reference (International Terrestrial Reference Frame - ITRF) consiste à réduire les observations de chaque technique de géodésie spatiale dans des solutions indépendantes. Le seul moyen de rattacher les repères spécifiques à chaque technique pour obtenir un repère combiné homogène est alors d'utiliser des rattachements topométriques entre les stations des différentes techniques co-localisées sur le même site d'observations. Cependant, les incohérences entre ces rattachements locaux et les estimations des positions des stations par géodésie spatiale sont aujourd'hui un facteur limitant majeur de la qualité de l'ITRF. Un autre moyen de rattacher les différentes techniques de géodésie spatiale consiste en l'utilisation de satellites multi-techniques, équipés d'instruments de plus d'une technique de géodésie spatiale. Le principal défi d'utiliser un tel satellite comme un rattachement inter-technique se trouve dans la connaissance (ou estimation) précise des vecteurs entre le centre de masse du satellite (ou autre point de référence sur le satellite) et les points de référence des différents instruments (i. E. Les liens spatiaux). Dans cette thèse, nous présentons les résultats d'analyses multi-techniques (GPS + SLR + DORIS) impliquant le satellite Jason-2, et nous les comparons aux résultats des analyses traditionnelles mono-technique. Nous évaluons en particulier l'effet de traiter simultanément les observations des trois techniques avec le satellite Jason-2 comme lien inter-technique sur la résolution des ambiguïtés de phase GPS, sur l'estimation simultanée des orbites des satellites de la constellation GPS et de Jason-2 et sur l'estimation des positions des stations au sol. En outre, les résultats de l'estimation des liens spatiaux de Jason-2 sont présentés, afin d'évaluer la qualité des valeurs actuellement disponiblesIn the present approach used to produce the International Terrestrial Reference Frame (ITRF), observations of the different space geodetic techniques are reduced in independent analyses. The only mean to tie the resulting technique-specific frames into a homogeneous combined frame is then to use local topometric ties between stations of different techniques co-located at the same observatory. However, inconsistencies between these local ties and space geodesy estimates of the station positions are today a major limiting factor of the ITRF quality. An alternative way of tying the different space geodetic techniques together is through the use of multitechnique satellites equipped with instruments of more than one technique. The main challenge of using such a satellite as an inter-technique link resides in the accurate knowledge (or estimation) of the vectors between the satellite's center of mass and the reference points of its different instruments (i. E. Space ties). In this thesis we present the results from multi-technique (GPS+SLR+DORIS) analyses involving the Jason-2 satellite, and we compare them to the results from traditional single-technique analyses. We assess in particular the effect of simultaneously processing the observations of the three techniques with Jason-2 as inter-technique link on the resolution of the GPS phase ambiguities, on the estimation of the GPS and Jason-2 satellite orbits and on the estimation of the ground station positions. Moreover, results of the estimation of the Jason-2 space ties are presented, in order to assess the quality of the presently available values
Books on the topic "GNSS-2"
Book chapters on the topic "GNSS-2"
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de Haan, S., E. Pottiaux, J. Sánchez-Arriola, M. Bender, J. Berckmans, H. Brenot, C. Bruyninx, et al. "Use of GNSS Tropospheric Products for High-Resolution, Rapid-Update NWP and Severe Weather Forecasting (Working Group 2)." In Advanced GNSS Tropospheric Products for Monitoring Severe Weather Events and Climate, 203–65. Cham: Springer International Publishing, 2019. http://dx.doi.org/10.1007/978-3-030-13901-8_4.
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Teunissen, Peter J. G. "Mixed Integer Estimation and Validation for Next Generation GNSS." In Handbook of Geomathematics, 1–28. Berlin, Heidelberg: Springer Berlin Heidelberg, 2013. http://dx.doi.org/10.1007/978-3-642-27793-1_37-2.
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Abolmasov, Biljana, Svetozar Milenković, Branko Jelisavac, Marko Pejić, and Zoran Radić. "The Analysis of Landslide Dynamics Based on Automated GNSS Monitoring—A Case Study." In Engineering Geology for Society and Territory - Volume 2, 143–46. Cham: Springer International Publishing, 2015. http://dx.doi.org/10.1007/978-3-319-09057-3_15.
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Loukakis, Andreas. "Chapter 2: Liability risks within the field of GNSS: general remarks." In Non-Contractual Liabilities from Civilian Versions of GNSS, 71–98. Nomos Verlagsgesellschaft mbH & Co. KG, 2017. http://dx.doi.org/10.5771/9783845280677-71.
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Johann, Felix, David Becker, Matthias Becker, and E. Sinem Ince. "Multi-Scenario Evaluation of the Direct Method in Strapdown Airborne and Shipborne Gravimetry." In International Association of Geodesy Symposia. Berlin, Heidelberg: Springer Berlin Heidelberg, 2020. http://dx.doi.org/10.1007/1345_2020_127.
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AbstractIn recent years, it was shown that the quality of strapdown airborne gravimetry using a navigation-grade strapdown inertial measurement unit (IMU) could be on par with “classical” airborne gravimeters as the 2-axis stabilized LaCoste and Romberg S-type gravimeter. Basically, two processing approaches exist in strapdown gravimetry. Applying the indirect method (also referred to as “inertial navigation approach” or “one-step approach”), all observations – raw GNSS observations or position solutions, IMU specific force and angular rate measurements – are combined in a single Kalman Filter. Alternatively, applying the direct method (also referred to as “accelerometry approach” or “cascaded approach”), GNSS position solutions are numerically differentiated twice to get the vehicle’s kinematic acceleration, which is then directly removed from the IMU specific force measurement in order to obtain gravity. In the scope of this paper, test runs for the application of strapdown airborne and shipborne gravimetry are evaluated using an iMAR iNAV-RQH-1003 IMU. Results of the direct and the indirect methods are compared to each other. Additionally, a short introduction to the processing scheme of the Chekan-AM gravimeter data is given and differences between Chekan-AM and strapdown results of the shipborne campaigns are analysed. Using the same data set, the cross-over residuals suggest a similar accuracy of 0.39 mGal for the Chekan-AM and 0.41 mGal for the adjusted strapdown results (direct method).
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Bhatta, Basudeb. "Functional Segments of GNSS." In Global Navigation Satellite Systems, 19–38. 2nd ed. CRC Press, 2021. http://dx.doi.org/10.1201/9781003148753-2.
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Narbudowicz, Adam. "Antenna technology for GNSS." In GPS and GNSS Technology in Geosciences, 99–117. Elsevier, 2021. http://dx.doi.org/10.1016/b978-0-12-818617-6.00003-2.
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Perez-Ruiz, Manuel, Jorge Martínez-Guanter, and Shrini K. Upadhyaya. "High-precision GNSS for agricultural operations." In GPS and GNSS Technology in Geosciences, 299–335. Elsevier, 2021. http://dx.doi.org/10.1016/b978-0-12-818617-6.00017-2.
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Smith, Victoria Anne, Graham Appleby, Marek Ziebart, and Jose Rodriguez. "Twelve Years of High Frequency Absolute Gravity Measurements at the UK’s Space Geodesy Facility: Systematic Signals and Comparison with SLR Heights." In International Association of Geodesy Symposia. Berlin, Heidelberg: Springer Berlin Heidelberg, 2021. http://dx.doi.org/10.1007/1345_2021_129.
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AbstractAbsolute gravity measurements taken on a near-weekly basis at a single location is a rarity. Twelve years of data at the UK’s Space Geodesy Facility (SGF) provides evidence to show that the application of results from international comparisons of absolute gravimeters should be applied to data and are critical to the interpretation of theSGF gravity time series of data from 2007 to 2019. Though residual biases in the data are seen. The SGF time series comprises near weekly data, with exceptions for manufacturer services and participation in international instrument comparisons. Each data set comprises hourly data taken over 1 day, with between 100 and 200 drops per hour. Environmental modelling indicates that the annual groundwater variation at SGFof some 2 m influences the gravity data by 3.1 μGal, based upon some measured and estimated soil parameters. The soil parameters were also used in the calculation of the effect of an additional telescope dome, built above the gravity laboratory, and have been shown to be realistic. Sited in close proximity to the long-established satellite laser ranging (SLR) system and the global navigation satellite systems (GNSS) the absolute gravimetry (AG) measurements provide a complimentary geodetic technique, which is non space-based. The SLR-derived height time series provides an independent measurement of vertical motion at the site which may be used to assess the AG results, which are impacted by ground motion as well as mass changes above and below the instruments.
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"8. Les différentes combinaisons de mesures GNSS." In Le temps dans la géolocalisation par satellites, 125–32. EDP Sciences, 2020. http://dx.doi.org/10.1051/978-2-7598-2468-7.c010.
Full textConference papers on the topic "GNSS-2"
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Marradi, Livio, Andrea Galimberti, Lucio Foglia, Alberto Zin, Cristina Pecchioni, Manuel Doronzo, Emilio Javier Gonzalez Garcia-Consuegra, and Mouna Lekchiri. "GNSS for Enhanced Odometry: The GRAIL-2 results." In 2012 6th ESA Workshop on Satellite Navigation Technologies (Navitec 2012) & European Workshop on GNSS Signals and Signal Processing. IEEE, 2012. http://dx.doi.org/10.1109/navitec.2012.6423069.
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Wang, Xianyi, Yusen Tian, Yueqiang Sun, Dongwei Wang, Chunjun Wu, Qifei Du, Yuerong Cai, et al. "Software Design of Gnos-2's GNSS-R Module." In IGARSS 2018 - 2018 IEEE International Geoscience and Remote Sensing Symposium. IEEE, 2018. http://dx.doi.org/10.1109/igarss.2018.8518594.
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Wong, Jun Kai, Robert Taylor, Sungchul Baek, Yasitha Hewakuruppu, Xuchuan Jiang, and Chuyang Chen. "Temperature Measurements of a Gold Nanosphere Solution in Response to Light-Induced Hyperthermia." In ASME 2013 International Mechanical Engineering Congress and Exposition. American Society of Mechanical Engineers, 2013. http://dx.doi.org/10.1115/imece2013-66424.
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Gold nanospheres (GNSs), biocompatible nanoparticles that can be designed to absorb visible and near-infrared light, have shown great potential in induced thermal treatment of cancer cells via Plasmonic Photothermal Therapy (PPTT) [3]. In this study, light induced heating of a water-based dispersion of 20 nm diameter GNSs was investigated at their plasmon resonance wavelength (λ = 520 nm). Temperature changes of the solution at the point of light irradiation were measured experimentally. A heat transfer model was used to verify the experimental data. The effect of two key parameters, light intensity and particle concentration, on the solution’s temperature was investigated. The experimental results showed a significant temperature rise of the GNS solution compared to de-ionized water. The temperature rise of GNS solution was linearly proportional to the concentration of GNS (from 0.25–1.0 C, C = 1×1013 particles per ml) and the light intensity (from 0.25 to 0.5 W cm−2). The experimental data matches the modeling results adequately. Overall, it can be concluded that the hyperthermic ablation of cancer cells via GNS can be achieved by controlled by the light intensity and GNS concentration. A novel component of this study is that a high power lamp source was used instead of a high power laser. This means that only low cost components were used in the current experimental set-up. Moreover, by using suitable filters and white light from the high power lamp source, it is possible to obtain light in many wavelength bands for the study of other nanoparticles with different plasmon wavelength ranges. The current results represtent just one example in this versatile experimental set-up developed. It should be noted, however, the plasmon resonance wavelength used in this study is not within the therapeutic window (750–1300 nm) [13]. Therefore, the GNSs used in this experiment are only applicable to the surface induced thermal treatment of cancer cells, for instance, in the skin.
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Basavaraju, D. R., and S. Ravikumar. "Realization of Semicircular 2 Way Optimal Power Divider for GNSS." In 2020 Third International Conference on Multimedia Processing, Communication & Information Technology (MPCIT). IEEE, 2020. http://dx.doi.org/10.1109/mpcit51588.2020.9350500.
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Progri, Ilir F. "Maximum Likelihood GNSS Parameter Estimation: Part 2, Bessel Distribution-Theory and Simulation." In 2018 International Technical Meeting of The Institute of Navigation. Institute of Navigation, 2018. http://dx.doi.org/10.33012/2018.15540.
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Cook, K., Chen-Joe Fong, M. J. Wenkel, P. Wilczynski, N. Yen, and G. S. Chang. "FORMOSAT-7/COSMIC-2 GNSS radio occultation constellation mission for global weather monitoring." In 2013 IEEE Aerospace Conference. IEEE, 2013. http://dx.doi.org/10.1109/aero.2013.6497317.
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Progri, Ilir F. "Advanced Anti-Jam Indoor Adaptive GNSS Signal Acquisition: Part 2, Bessel Distribution - Theory." In 2018 International Technical Meeting of The Institute of Navigation. Institute of Navigation, 2018. http://dx.doi.org/10.33012/2018.15541.
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Shah Sadman, A. A. M., and Md Hossam-E-Haider. "Design of a 2 × 3 Microstrip Patch Phased Array Antenna for GNSS Augmentation." In 2020 23rd International Conference on Computer and Information Technology (ICCIT). IEEE, 2020. http://dx.doi.org/10.1109/iccit51783.2020.9392680.
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Kaminskis, Janis, Lubova Sulakova, Kalvis Salmins, Janis Kaulins, and Lauris Goldbergs. "SLR and GNSS Test Field for Global Geodetic Network Assessment in Riga." In 11th International Conference “Environmental Engineering”. VGTU Technika, 2020. http://dx.doi.org/10.3846/enviro.2020.718.
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The basic aim is to contribute to the world geodetic space in line with today’s scientific achievements. Riga geodynamic site is a thankful place for this, as it has long-term SLR observations and the longest GNSS records in Latvia. The goal is establishment of regional long-term geodetic monitoring station at LU Institute of Astronomy, Riga, Kandavas street 2, by joining at least two space geodetic technologies – the already installed laser-telescope LS-105 and GNSS − collocated, but not sufficiently linked. The capability of geodetic GNSS observations would uniquely complement Riga GNSS station and allow to determine more accurate coordinates of the LS-105 laser telescope and the long-term changes needed to accurately measure the positions of Earth satellites and other similar space objects. GNSS Observation Station will contribute to the development of positioning and position long-term change to accuracy of less than 1mm, one of the current global goals of GGOS. We plan to solve the problem with the exact position of the telescope LS-105 it will contribute to the development of scientific research and applied potential of the LU Satellite Laser Ranging station. From the national point of view geodetic station serves as an important point for Latvian National Geodetic Network, long term large infrastructure planning, engineering communications, cartography, etc. From a global perspective the station will be one of very few such stations in the region and the only one in the Baltics capable of valuable contribution to ITRF network. Preparatory work for the study has started by selecting and consolidating geodetic points for further measurements.
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Carreno-Luengo, H., A. Amezaga, A. Bolet, D. Vidal, J. Jane, J. F. Munoz, R. Olive, et al. "3CAT-2: A 6U CubeSat-based multi-constellation, dual-polarization, and dual-frequency GNSS-R and GNSS-RO experimental mission." In IGARSS 2015 - 2015 IEEE International Geoscience and Remote Sensing Symposium. IEEE, 2015. http://dx.doi.org/10.1109/igarss.2015.7326984.
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