Bibliografie tematiche / GNSS

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Letteratura scientifica selezionata sul tema "GNSS"

Autore: Grafiati

Pubblicato: 4 giugno 2021

Ultima modifica: 23 novembre 2024

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Articoli di riviste sul tema "GNSS"

Yang, Lijie, Jinhua Wang, Liying Sun, Yisi Zhang, Peng Huang e Junfeng Guo. "Comparison of Gold Nanospheres, Nanorods, Nanocages and Nanoflowers for Combined Photothermal-Radiotherapy of Cancer". Nano 16, n. 04 (10 marzo 2021): 2150037. http://dx.doi.org/10.1142/s1793292021500375.

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Gold nanoparticles are promising dual agents for combined photothermal-radiotherapy of cancer. Nevertheless, the shape effects of gold nanoparticles on photothermal conversion efficiency and radiosensitization have not been completely revealed. To address this knowledge gap, different shapes of gold nanoparticles including gold nanospheres (GNSs), gold nanorods (GNRs), gold nanocages (GNCs) and gold nanoflowers (GNFs) were synthesized. Despite being subjected to the same modification with poly (ethylene glycol) (PEG), these gold nanoparticles showed different cellular uptake efficiencies: GNFs[Formula: see text][Formula: see text][Formula: see text]GNSs[Formula: see text][Formula: see text][Formula: see text]GNCs[Formula: see text][Formula: see text][Formula: see text]GNRs. Moreover, GNRs, GNCs and GNFs could convert near-infrared (NIR) light to heat and GNFs displayed the highest photothermal conversion efficiency, whereas GNSs showed poor photothermal effects due to the weak NIR absorption. The highest uptake efficiency as well as the best photothermal conversion ability led to GNFs to exhibit the best photothermal therapeutic effect. Furthermore, all the gold nanoparticles could be used as radiosensitizers to improve radiotherapeutic effect. Among these nanoparticles, GNFs showed the best radiation enhancement effect because of their highest uptake efficiency. Furthermore, a higher accumulation of GNFs in tumor tissues was observed than those of other shaped gold nanoparticles. Importantly, our in vitro and in vivo comparative studies revealed that GNFs possessed the strongest anticancer effect in combined photothermal-radiotherapy. Hence, compared to gold nanoparticles with other shapes, the GNFs might be more desirable dual agents for highly efficient combined photothermal-radiotherapy.

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Yang, Guanglin, Weihua Bai, Jinsong Wang, Xiuqing Hu, Peng Zhang, Yueqiang Sun, Na Xu et al. "FY3E GNOS II GNSS Reflectometry: Mission Review and First Results". Remote Sensing 14, n. 4 (17 febbraio 2022): 988. http://dx.doi.org/10.3390/rs14040988.

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FengYun-3E (FY3E), launched on 5 July 2021, is one of China’s polar-orbiting meteorological satellite series. The GNOS II onboard FY3E is an operational GNSS remote sensor that for the first time combines GNSS radio occultation (GNSS RO) and GNSS reflectometry (GNSS-R). It has eight reflection channels that can track eight specular points at the same time, receiving reflected signals from multiple GNSS systems, including GPS, BeiDou and Galileo. The basic GNSS-R output generated by GNOS II is a 122 × 20 non-uniform delay-Doppler map whose high resolution portion captures more information near the specular point. This paper introduces the GNSS-R aspect of the FengYun-3E GNOS II, including the instrument, power calibration and wind speed retrieval algorithm. Preliminary validation results for its first four months of data are also presented. After preliminary quality control, the overall wind speed error is less than 2 m/s at wind speeds below 20 m/s for data from both GPS satellites and BeiDou satellites when compared to the ECMWF reanalysis winds.

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Yasyukevich, Yury V., Baocheng Zhang e Venkata Ratnam Devanaboyina. "Advances in GNSS Positioning and GNSS Remote Sensing". Sensors 24, n. 4 (12 febbraio 2024): 1200. http://dx.doi.org/10.3390/s24041200.

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Scientists and engineers use data utilize global navigation satellite systems (GNSSs) for a multitude of tasks: autonomous navigation, transport monitoring, construction, GNSS reflectometry, GNSS ionosphere monitoring, etc [...]

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Wang, Xiaocui, Guohua Li, Yu Ding e Shuqing Sun. "Understanding the photothermal effect of gold nanostars and nanorods for biomedical applications". RSC Adv. 4, n. 57 (2014): 30375–83. http://dx.doi.org/10.1039/c4ra02978j.

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Shan, Feng, Jingyi Huang, Yanyan Zhu e Guohao Wei. "Photo-Thermal Conversion and Raman Sensing Properties of Three-Dimensional Gold Nanostructure". Molecules 29, n. 18 (10 settembre 2024): 4287. http://dx.doi.org/10.3390/molecules29184287.

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Three-dimensional plasma nanostructures with high light–thermal conversion efficiency show the prospect of industrialization in various fields and have become a research hotspot in areas of light–heat utilization, solar energy capture, and so on. In this paper, a simple chemical synthesis method is proposed to prepare gold nanoparticles, and the electrophoretic deposition method is used to assemble large-area three-dimensional gold nanostructures (3D-GNSs). The light–thermal water evaporation monitoring and surface-enhanced Raman scattering (SERS) measurements of 3D-GNSs were performed via theoretical simulation and experiments. We reveal the physical processes of local electric field optical enhancement and the light–thermal conversion of 3D-GNSs. The results show that with the help of the efficient optical trapping and super-hydrophilic surface properties of 3D-GNSs, they have a significant effect in accelerating water evaporation, which was increased by nearly eight times. At the same time, the three-dimensional SERS substrates based on gold nanosphere particles (GNSPs) and gold nanostar particles (GNSTs) had limited sensitivities of 10−10 M and 10−12 M to R6G molecules, respectively. Therefore, 3D-GNSs show strong competitiveness in the fields of solar-energy-induced water purification and the Raman trace detection of organic molecules.

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Gu, Nianzu, Fei Xing e Zheng You. "GNSS Spoofing Detection Based on Coupled Visual/Inertial/GNSS Navigation System". Sensors 21, n. 20 (12 ottobre 2021): 6769. http://dx.doi.org/10.3390/s21206769.

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Spoofing attacks are one of the severest threats for global navigation satellite systems (GNSSs). This kind of attack can damage the navigation systems of unmanned air vehicles (UAVs) and other unmanned vehicles (UVs), which are highly dependent on GNSSs. A novel method for GNSS spoofing detection based on a coupled visual/inertial/GNSS positioning algorithm is proposed in this paper. Visual inertial odometry (VIO) has high accuracy for state estimation in the short term and is a good supplement for GNSSs. Coupled VIO/GNSS navigation systems are, unfortunately, also vulnerable when the GNSS is subject to spoofing attacks. The method proposed in this article involves monitoring the deviation between the VIO and GNSS under an optimization framework. A modified Chi-square test triggers the spoofing alarm when the detection factors become abnormal. After spoofing detection, the optimal estimation algorithm is modified to prevent it being deceived by the spoofed GNSS data and to enable it to carry on positioning. The performance of the proposed spoofing detection method is evaluated through a real-world visual/inertial/GNSS dataset and a real GNSS spoofing attack experiment. The results indicate that the proposed method works well even when the deviation caused by spoofing is small, which proves the efficiency of the method.

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Zubinaitė, Vilma, e George Preiss. "A PROPOSED SIMPLIFIED TECHNIQUE FOR CONFIRMING HIGH PRECISION GNSS ANTENNA OFFSETS". Aviation 14, n. 3 (30 settembre 2010): 83–89. http://dx.doi.org/10.3846/aviation.2010.13.

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The purpose of this research was to independently investigate and determine confirmatory calibration procedures for GNSS antennas. This paper focuses on the aspect of simplified techniques for confirming high precision GNSS antenna offsets. In the other words, the aim is to verify GNSS antenna offset parameters ‐ results, which will be used to find the consequences on ground positions of orbital distortions caused by solar activity. It is well known that the computation of GNSS observations using high precision GNSS antennas requires knowledge of the relevant antenna phase centre offsets. These offsets are the distance in three dimensions from the antenna's physical centre to the point in space at which the antenna ‘measures’ position. The calibration processes used by manufacturers appear to vary, and, where receivers of different models are to be used together, it is essential that the calibration parameters used are all produced using the same methods and by the same authoritative sources. Meanwhile, with the growth in the use of high precision GNSS systems, the likelihood of antennas being accidentally mishandled is possibly higher than previously. Finally, it is noted that it has long been the practise for surveyors to check their instruments to ensure that they are properly calibrated. In the modern electronic age, however, it seems that this practise has been allowed to lapse as far as GNSS instrumentation is concerned. With the above in mind, it has been decided to attempt to create a simplified procedure for calibrating high precision GNSS antennas. The aim is that it will be possible for the average surveyor to check his antenna without great effort or trouble. The objective can also be described as finding a simplified field procedure to determine whether a specific antenna's offset parameters are within reasonable agreement with published figures. Santrauka Straipsnyje analizuojamas supaprastintas metodas, kuriuo galima aprobuoti aukšto tikslumo globalines navigacines palydovines sistemos (GNPS) antenos nukrypimus. Siekiama patinkrinti GNPS antenos nukrypimo parametrus ‐ rezultatus, kurie bus naudojami nustatant GNPS palydovo orbitos iškraipymu padarinius. Nagrinejama procedūra, kai siekiama nustatyti, ar konkrečios GNPS antenos kalibravimo parametrai yra pagristi, palyginti su publikuotais duomenimis. Analizuojama problema yra aktuali, kai GNPS matavimams naudojamos aukšto tikslumo GNPS antenos ir reikalingos žinios, susijusios su antenos fazes centro nukrypimais.

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Magny, Jean Pierre. "Application of Satellite Based Augmentation Systems to Altitude Separation". Journal of Navigation 52, n. 3 (settembre 1999): 313–17. http://dx.doi.org/10.1017/s0373463399008413.

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This paper presents the application of GNSS1, or more precisely of Satellite Based Augmentation Systems (SBAS), to vertical separation for en-route, approach and landing operations. Potential improvements in terms of operational benefit and of safety are described for two main applications. First, vertical separation between en-route aircraft, which requires a system available across wide areas. SBAS (EGNOS, WAAS, and MSAS) are very well suited for this purpose before GNSS2 becomes available. And secondly, vertical separation from the ground during approach and landing, for which preliminary design principles of instrument approach procedures and safety issues are presented. Approach and landing phases are the subject of discussions within ICAO GNSS-P. En-route phases have been listed as GNSS-P future work and by RTCA for development of new equipments.

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Qiu, Tongsheng, Xianyi Wang, Yueqiang Sun, Fu Li, Zhuoyan Wang, Junming Xia, Qifei Du et al. "An Innovative Signal Processing Scheme for Spaceborne Integrated GNSS Remote Sensors". Remote Sensing 15, n. 3 (27 gennaio 2023): 745. http://dx.doi.org/10.3390/rs15030745.

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The vigorous development of the global navigation satellite system (GNSS) has led to a boom in GNSS radio occultation (GNSS RO) and GNSS reflectometry (GNSS-R) techniques. Consequently, we have proposed an innovative signal processing scheme for spaceborne integrated GNSS remote sensors (SIGRS), combining a GNSS RO and a GNSS-R module. In the SIGRS, the GNSS-R module shares one precise orbit determination (POD) module with the GNSS RO module, and the GNSS-R module first achieves compatibility with GPS, BDS, and Galileo. Moreover, the programmable non-uniform delay resolution was introduced and first used by the SIGRS to generate the output DDM, which achieves a high delay resolution in the DDM central region around the specular point to improve the accuracy of basic observables but requires fewer delay bins than the conventional DDM with uniform delay resolution. The SIGRS has been successfully used to design the GNOS II onboard the Chinese FY-3E satellite, and the results of in-orbit operation validate the performance of the SIGRS, which means the SIGRS is an economically and technically efficient design and has become the first successful signal processing scheme for spaceborne integrated GNSS remote sensors around the world.

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Huang, Zhenchuan, Shuanggen Jin, Ke Su e Xu Tang. "Multi-GNSS Precise Point Positioning with UWB Tightly Coupled Integration". Sensors 22, n. 6 (14 marzo 2022): 2232. http://dx.doi.org/10.3390/s22062232.

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Abstract (sommario):

Global Navigation Satellite Systems (GNSSs) can provide high-precision positioning services, which can be applied to fields including navigation and positioning, autonomous driving, unmanned aerial vehicles and so on. However, GNSS signals are easily disrupted in complex environments, which results in a positioning performance with a significantly inferior accuracy and lengthier convergence time, particularly for the single GNSS system. In this paper, multi-GNSS precise point positioning (PPP) with tightly integrating ultra-wide band (UWB) technology is presented to implement fast and precise navigation and positioning. The validity of the algorithm is evaluated by a set of GNSS and UWB data. The statistics indicate that multi-GNSS/UWB integration can significantly improve positioning performance in terms of the positioning accuracy and convergence time. The improvement of the positioning performance for the GNSS/UWB tightly coupled integration mainly concerns the north and east directions, and to a lesser extent, the vertical direction. Furthermore, the convergence performance of GNSS/UWB solution is analyzed by simulating GNSS signal interruption. The reliability and robustness of GNSS/UWB solution during GNSS signal interruption is verified. The results show that multi-GNSS/UWB solution can significantly improve the accuracy and convergence speed of PPP.

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Più fonti

Tesi sul tema "GNSS"

Jedlička, Petr. "Softwarový přijímač GNSS". Master's thesis, Vysoké učení technické v Brně. Fakulta elektrotechniky a komunikačních technologií, 2020. http://www.nusl.cz/ntk/nusl-413152.

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The thesis deals with the analysis and the reception of the freely available signals of the navigation satellites in the L1 and E1 bands of the GPS and Galileo systems. The described signal reception sections include the process of the acquisition, the carrier frequency and phase synchronization and tracking, the spreading code phase tracking, the signal demodulation and the channel decoding. The simulation of the entire receiver is performed in MATLAB. The deeply analyzed signal reception component is the one responsible for the carrier phase and frequency synchronization and tracking. In that case, more methods and their comparison are usually listed. The signal reception component, which is responsible for the carrier phase and frequency tracking and the spreading code phase tracking, is also implemented in FPGA.

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Marques, Heloísa Alves Silva [UNESP]. "Modelo estocástico para dados GNSS e séries temporais de coordenadas GNSS". Universidade Estadual Paulista (UNESP), 2013. http://hdl.handle.net/11449/108612.

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Made available in DSpace on 2014-08-13T14:50:47Z (GMT). No. of bitstreams: 0 Previous issue date: 2013-12-13Bitstream added on 2014-08-13T18:00:33Z : No. of bitstreams: 1 000758352.pdf: 6791091 bytes, checksum: 54f40e4f8672f601934bd9bbf7eadbfe (MD5)
Os modelos funcionais relacionados com as observações GNSS são mais conhecidos do que os modelos estocásticos, visto que o desenvolvimento destes últimos é mais complexo. Normalmente, utilizam-se modelos estocásticos numa forma simplificada, como o modelo padrão, o qual assume que todas as medidas das observações GNSS têm a mesma variância e são estatisticamente independentes, espacialmente e temporalmente. Porém, tal suposição não reflete a realidade. Desta forma, atualmente os modelos estocásticos vêm sendo pesquisados com maior profundidade, por exemplo, considerando correlação temporal, cintilação ionosférica, dentre outros. O Brasil, por estar numa região geomagnética equatorial, sofre forte influência de cintilação ionosférica e outros efeitos relacionados à ionosfera. Tendo em vista a recente tecnologia de receptores GNSS que proporciona a possibilidade de se obter parâmetros de cintilação ionosférica, este efeito é factível de ser considerado na modelagem estocástica. Mesmo com a realização de uma modelagem estocástica adequada no processamento de dados GNSS, ainda podem restar erros não-modelados (ruídos), os quais devem contaminar as séries temporais das coordenadas obtidas com as observáveis GNSS, em especial aqueles relacionados com fatores que extrapolam a duração de uma dia, que é o período em geral utilizado na modelagem e processamento dos dados. Desta forma, tais ruídos podem ser caracterizados a partir das componentes de variância dos ruídos das séries temporais. Sendo assim, essa pesquisa teve como objetivo expandir as investigações com relação à modelagem estocástica das observações GNSS considerando principalmente os efeitos de cintilação ionosférica na região brasileira...
Functional models related to GNSS observations are better known than the stochastic models because the development these last one is more complex. Generally, stochastic models are applied in a simplified form, as the standard model, which assumes that all GNSS measurements have the same variance and are statistically independent, spatially and temporally. However, this assumption does not reflect the reality. Therefore, currently the stochastic models have been investigated more deeply, for instance, considering time correlation, ionospheric scintillation, among others. Brazil is located in the equatorial geomagnetic region and because of this suffers strong influence of ionospheric scintillation and other effects related to the ionosphere. Considering the recent technology of the GNSS receivers, that provide ways to obtain parameters of ionospheric scintillation, this effect is feasible of being considered in the stochastic modeling. Even if an adequate stochastic modeling could be applied in the GNSS data processing, it still may remain non-modeled errors (noise) that can influence the coordinate’s time series, especially those related to factors that go beyond the duration of one day, which is in general the interval (one day) used in the modeling and data processing. Thus, such noise can be characterized from the noise variance components of the time series. Therefore, this research aimed to expand the investigations regarding the stochastic modeling of GNSS observations mainly considering the ionospheric scintillation effects in the Brazilian region. Furthermore, it also aims to perform investigations related to methodologies for the noise characterization in the GNSS coordinates time series and establish a methodology for building functional models of these series...

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Marques, Heloísa Alves Silva. "Modelo estocástico para dados GNSS e séries temporais de coordenadas GNSS /". Presidente Prudente, 2013. http://hdl.handle.net/11449/108612.

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Orientador: João Francisco Galera Monico
Coorientador: Manoel Ivanildo Silvestre Bezerra
Banca: Silvio Rogério Correia de Freitas
Banca: Eunice Menezes de Souza
Banca: Vilma Mayumi Tachibana
Banca: Daniele Barroca Marra Alves
Resumo: Os modelos funcionais relacionados com as observações GNSS são mais conhecidos do que os modelos estocásticos, visto que o desenvolvimento destes últimos é mais complexo. Normalmente, utilizam-se modelos estocásticos numa forma simplificada, como o modelo padrão, o qual assume que todas as medidas das observações GNSS têm a mesma variância e são estatisticamente independentes, espacialmente e temporalmente. Porém, tal suposição não reflete a realidade. Desta forma, atualmente os modelos estocásticos vêm sendo pesquisados com maior profundidade, por exemplo, considerando correlação temporal, cintilação ionosférica, dentre outros. O Brasil, por estar numa região geomagnética equatorial, sofre forte influência de cintilação ionosférica e outros efeitos relacionados à ionosfera. Tendo em vista a recente tecnologia de receptores GNSS que proporciona a possibilidade de se obter parâmetros de cintilação ionosférica, este efeito é factível de ser considerado na modelagem estocástica. Mesmo com a realização de uma modelagem estocástica adequada no processamento de dados GNSS, ainda podem restar erros não-modelados (ruídos), os quais devem contaminar as séries temporais das coordenadas obtidas com as observáveis GNSS, em especial aqueles relacionados com fatores que extrapolam a duração de uma dia, que é o período em geral utilizado na modelagem e processamento dos dados. Desta forma, tais ruídos podem ser caracterizados a partir das componentes de variância dos ruídos das séries temporais. Sendo assim, essa pesquisa teve como objetivo expandir as investigações com relação à modelagem estocástica das observações GNSS considerando principalmente os efeitos de cintilação ionosférica na região brasileira...
Abstract: Functional models related to GNSS observations are better known than the stochastic models because the development these last one is more complex. Generally, stochastic models are applied in a simplified form, as the standard model, which assumes that all GNSS measurements have the same variance and are statistically independent, spatially and temporally. However, this assumption does not reflect the reality. Therefore, currently the stochastic models have been investigated more deeply, for instance, considering time correlation, ionospheric scintillation, among others. Brazil is located in the equatorial geomagnetic region and because of this suffers strong influence of ionospheric scintillation and other effects related to the ionosphere. Considering the recent technology of the GNSS receivers, that provide ways to obtain parameters of ionospheric scintillation, this effect is feasible of being considered in the stochastic modeling. Even if an adequate stochastic modeling could be applied in the GNSS data processing, it still may remain non-modeled errors (noise) that can influence the coordinate's time series, especially those related to factors that go beyond the duration of one day, which is in general the interval (one day) used in the modeling and data processing. Thus, such noise can be characterized from the noise variance components of the time series. Therefore, this research aimed to expand the investigations regarding the stochastic modeling of GNSS observations mainly considering the ionospheric scintillation effects in the Brazilian region. Furthermore, it also aims to perform investigations related to methodologies for the noise characterization in the GNSS coordinates time series and establish a methodology for building functional models of these series...
Doutor

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Oliveira, Priscylla Angélica da Silva. "Fusão INS/GNSS com auxílio de medidas de baseline e ângulo GNSS". Instituto Tecnológico de Aeronáutica, 2014. http://www.bd.bibl.ita.br/tde_busca/arquivo.php?codArquivo=3171.

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Este trabalho investiga sistemas de navegação INS/GNSS auxiliado por medidas de baseline e ângulo GNSS. Os dados gerados para as simulações foram os dados IMU, dados GNSS e informações de baseline e ângulo GNSS. Estas informações, determinadas a partir de um sistema multiantenas para o posicionamento simples e relativo e no método direto, respectivamente, foram utilizadas como medidas auxiliares para a fusão INS/GNSS. Foi estudada a influência dessas medidas auxiliares nas estimativas de atitude do navegador, mais especificamente no ângulo de yaw, pois o acoplamento da dinâmica do sistema com este ângulo é fraco. Assim, a principal contribuição das medidas adicionais ocorre para este ângulo. Adicionalmente, foi feito um estudo da navegação INS/GNSS usando dados reais SIG-IMU/NAVCON para análise dos biase, baseado em um maior número de realizações, analisou-se a influência do valor de estimativa do erro de atitude do navegador INS/GNSS no erro máximo de posição. Uma interface gráfica foi aprimorada de modo a facilitar as mudanças nos parâmetros do sistema e as simulações dos vários casos, tais como navegação INS/GNSS sem auxílio e com auxílio de baseline e ângulo GNSS, falha do sinal GNSS e navegação INS/GNSS utilizando dados reais.

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Taha, Ahmad Adnan Mohammad. "Mapping the underworld : integrated GNSS based positioning and GIS based GNSS simulation". Thesis, University of Nottingham, 2008. http://eprints.nottingham.ac.uk/10607/.

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The United Kingdom utility services are facing the challenge of "mapping the underworld" over four million kilometres of buried pipes and cables (a combination of water, sewage, gas, electricity and drainage). Having accurately mapped pipes and cables increases the efficiency of street works projects, but many existing pipes and cables were only mapped relative to other topographic map features and to varying levels of accuracy. The aim of this thesis is to research various means of improving the positional accuracy of underground utilities in built-up areas through the use of Global Navigation Satellite System (GNSS), integrated with other positioning systems such as Inertial Navigation Systems (INS) and total stations. The reliability and accuracy of the integrated system is an underpinning issue and this thesis looks at testing both current and future GNSS constellations in a controlled environment at the University of Nottingham campus. GNSS integrated with an INS in the first instance, and integrated with a total-station in the second instance, are tested using a network of established points in urban canyon environments on the campus. Several, new technologies were developed by the author including: Urban Canyon GNSS Simulation (UCGS) - a GIS tool; Multiple Step Integration Technique (MSIT) - a methodology for GNSS/INS data collection and processing; and Continuous Updating Technique (CUPT) - a software for GNSS/total-station integration. The results of different simulations provide evidence that using more than one GNSS constellation will significantly increase the availability of GNSS positions in urban canyon environments. However, position availability using the criteria of 5 or more satellites with a Position Dilution Of Precision (PDOP) value of 6 or less for centimetre level is not guaranteed 100% of the time when using GNSS alone. Considering the results of the integrated GNSS/INS system, the position availability was guaranteed 100% of the time in all environments, but the accuracy is not enough to meet utility service requirements. The best results used GNSS integrated with a total-station and showed that, in this case, position availability to a centimetre level of accuracy can be guaranteed 100% of the time in all environments.

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Beneš, Jiří. "Měření parametrů GNSS přijímačů". Master's thesis, Vysoké učení technické v Brně. Fakulta elektrotechniky a komunikačních technologií, 2020. http://www.nusl.cz/ntk/nusl-413203.

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Goal of this thesis is to propose and realize a viable method to determine static a dynamic parameters of GNSS receivers. Thesis begins with research of GNSS, foremostly determining position and associated uncertainties of measurement. Following chapter contains research of GNSS receivers, data flow and methods of evaluating parameters of such measurements. Summary of obtained information is then used to schedule measurements, assemble experiment and create evaluating metrics. Main selected evaluating metric is weighted histogram of deviations with extended information. Aplication of proposed metrics onto measurements of GNSS receivers augments available information of GNSS receiver accuracy for whole range of values. This metrics also supplies additional statistical information about course of measurement.

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Puchrik, Lukáš. "Aspekty vyhodnocení měření GNSS". Doctoral thesis, Vysoké učení technické v Brně. Fakulta stavební, 2013. http://www.nusl.cz/ntk/nusl-392288.

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The thesis deals with processing of epoch-wise GNSS measurements from local geodynamic network Sněžník. Its aim is to evaluate the geodynamics in the area of Králický Sněžník Massif and to assess the capabilities of epoch-wise GNSS measurements to detect the geodynamic movements. Within the thesis the comprehensive processing of all the GNSS measurements observed between years 1997 and 2011 is realized using the reprocessed products of first IGS reprocessing Repro1. Bernese GPS software version 5.0 is used for all the processing.

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Elmas, Zeynep Günsu. "Exploiting new GNSS signals to monitor, model and mitigate the ionospheric effects in GNSS". Thesis, University of Nottingham, 2013. http://eprints.nottingham.ac.uk/28418/.

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Signals broadcast by the Global Navigation Satellite Systems (GNSS) enable global, autonomous, geo-spatial positioning exploited in the areas such as geodesy, surveying, transportation and agriculture. The propagation of these signals is affected as they propagate through the Earth's upper atmosphere, the ionosphere, due to the ionic and electronic structure of the ionosphere. The ionosphere, a highly dynamic and spatially and temporally variable medium, can be the largest error source in Global Navigation Satellite System (Klobuchar 1991) in the absence of the Selective Availability. Propagation effects due to the ionosphere lead to errors in the range measurements, impact on receiver signal tracking performance and influence the GNSS positioning solution. The range error can vary from 1 to 100m depending on time of day, season, receiver location, conditions of the earth's magnetic field and solar activity (Hofmann-Wellenhof et al. 2001). This thesis focuses on modelling, monitoring and mitigating the ionospheric effects in GNSS within the scope of GNSS modernization, which introduces new signals, satellites and constellations. The ionosphere and its effects on GNSS signals, impact of the ionospheric effects at the receiver end, predicted error bounds of these effects under different solar, geomagnetic and ionospheric conditions, how these effects can be modelled and monitored with current and new (possible with GNSS modernization) correction approaches, degradation in the GNSS positioning solution and mitigation techniques to counter such degradation are investigated in this thesis. Field recorded and simulated data are considered for studying the refractive and diffractive effects of the ionosphere on GNSS signals, signal tracking performance and position solution. Data from mid-to-high latitudes is investigated for the refractive effects, which are due to dispersive nature of the ionosphere. With the use of multi-frequency, multi-constellation receivers, modelling of the refractive effects is discussed through elimination and estimation of these effects on the basis of dual and triple frequency approaches, concentrating on the benefit of the new GNSS signals. Data from the low latitudes is considered for studying the diffractive effects of the ionosphere, scintillation in particular, in GNSS positioning, and possible mitigation techniques to counter them. Scintillation can have a considerable impact on the performance of GNSS positioning by, for instance, increasing the probability of losing phase lock with a signal and reducing the accuracy of pseudoranges and phase measurements. In this sense, the impact of scintillation on signal tracking performance and position solution is discussed, where a novel approach is proposed for assessing the variance of the signal tracking error during scintillation. The proposed approach also contributes to the work related with scintillation mitigation, as discussed in this thesis. The timeliness of this PhD due to the recent and increasingly active period of the next Solar Cycle (predicted to reach a peak around 2013) and to the ongoing GNSS modernization give this research an opportunity to enhance the ionospheric knowledge, expertise and data archive at NGI, which is rewarding not only for this PhD but also for future research in this area.

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Younes, Abdelrazak. "Théorie séquentielle appliquée au contrôle de l'intégrité du GNSS et à l'hybridation GNSS/INS". Toulouse, INPT, 2000. http://www.theses.fr/2000INPT044H.

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Un récepteur GPS (Système de Positionnement Global par satellite) permet à son utilisateur de connaître sa position et sa vitesse à tout moment et à tout endroit du globe. Malheureusement, le GPS ne peut satisfaire à lui seul les exigences de l'OACI (Organisation de l'Aviation Civile Internationale) pour devenir un moyen unique de navigation. Il doit être amélioré pour cela. Une des principales limitations du GPS est son intégrité. Celle-ci peut être améliorée grâce à une augmentation du GPS ou par son hybridation avec un autre système de navigation. Au niveau du récepteur GPS, un module RAIM (Receiver Autonomous Integrity Monitoring) est proposé pour effectuer le contrôle autonome de l'intégrité du système. Ce module se sert de la redondance inhérente aux mesures GPS pour s'assurer qu'aucune panne n'affecte la solution GPS de navigation. En cas de panne, le RAIM doit aussi pouvoir rapidement détecter cette panne et exclure le satellite qui est en cause. Il existe deux sortes de RAIMs : le RAIM Snapshot n'utilise que les mesures GPS instantanées alors que le RAIM Séquentiel se sert de toutes les mesures passées et présentes pour décider de l'intégrité du système. La géométrie des satellites utilisée pour la solution de navigation peut nuire à la détection et/ou l'isolation d'une panne. Dans ces cas de figure, des tests sur mesures réelles et des simulations montrent que le RAIM Séquentiel est beaucoup plus performant que le RAIM Snapshot. De cette capacité à fonctionner sous des conditions adverses, la disponibilité du GPS lorsqu'il est contrôlé par un RAIM Séquentiel est naturellement améliorée. Beaucoup d'avions civils intègrent un Système de Navigation Inertielle (INS). Grâce à leur grande complémentarité, l'hybridation des systèmes GPS et INS peut devenir un moyen unique de navigation pour certaines phases de vol. Dans ce système, il faut s'assurer que la solution GPS utilisée pour recaler la solution INS soit intègre. C'est ce que permet le RAIM Séquentiel grâce à ses qualités théoriques (vérifiées par simulations). Un schéma d'hybridation exploitant ces qualités est présenté.

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Porter, Michael Howard. "A Performance Analysis of Two Civilian GNSS Receivers in a GNSS Contested Laboratory Environment". Ohio University / OhioLINK, 2019. http://rave.ohiolink.edu/etdc/view?acc_num=ohiou1564433045685393.

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Più fonti

Libri sul tema "GNSS"

Jin, Shuanggen, R. Jin e X. Liu. GNSS Atmospheric Seismology. Singapore: Springer Singapore, 2019. http://dx.doi.org/10.1007/978-981-10-3178-6.

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Awange, Joseph. GNSS Environmental Sensing. Cham: Springer International Publishing, 2018. http://dx.doi.org/10.1007/978-3-319-58418-8.

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Jin, Shuanggen, Estel Cardellach e Feiqin Xie. GNSS Remote Sensing. Dordrecht: Springer Netherlands, 2014. http://dx.doi.org/10.1007/978-94-007-7482-7.

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Ogaja, Clement A. Introduction to GNSS Geodesy. Cham: Springer International Publishing, 2022. http://dx.doi.org/10.1007/978-3-030-91821-7.

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Awange, Joseph L. Environmental Monitoring using GNSS. Berlin, Heidelberg: Springer Berlin Heidelberg, 2012. http://dx.doi.org/10.1007/978-3-540-88256-5.

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Tan, Shusen. GNSS Systems and Engineering. Singapore: John Wiley & Sons Singapore Pte. Ltd, 2017. http://dx.doi.org/10.1002/9781118897041.

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Lo Presti, Letizia, e Salvatore Sabina, a cura di. GNSS for Rail Transportation. Cham: Springer International Publishing, 2018. http://dx.doi.org/10.1007/978-3-319-79084-8.

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Bevly, David M. GNSS for vehicle control. Boston, Mass: Artech House, 2010.

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Bevly, David M. GNSS for vehicle control. Boston, Mass: Artech House, 2010.

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Wu, Renbiao, Wenyi Wang, Dan Lu, Lu Wang e Qiongqiong Jia. Adaptive Interference Mitigation in GNSS. Singapore: Springer Singapore, 2018. http://dx.doi.org/10.1007/978-981-10-5571-3.

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Capitoli di libri sul tema "GNSS"

Shi, Chuang, e Na Wei. "Satellite Navigation for Digital Earth". In Manual of Digital Earth, 125–60. Singapore: Springer Singapore, 2019. http://dx.doi.org/10.1007/978-981-32-9915-3_4.

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Abstract Global navigation satellite systems (GNSSs) have been widely used in navigation, positioning, and timing. China’s BeiDou Navigation Satellite System (BDS) would reach full operational capability with 24 Medium Earth Orbit (MEO), 3 Geosynchronous Equatorial Orbit (GEO) and 3 Inclined Geosynchronous Satellite Orbit (IGSO) satellites by 2020 and would be an important technology for the construction of Digital Earth. This chapter overviews the system structure, signals and service performance of BDS, Global Positioning System (GPS), Navigatsionnaya Sputnikovaya Sistema (GLONASS) and Galileo Navigation Satellite System (Galileo) system. Using a single GNSS, positions with an error of ~ 10 m can be obtained. To enhance the positioning accuracy, various differential techniques have been developed, and GNSS augmentation systems have been established. The typical augmentation systems, e.g., the Wide Area Augmentation System (WAAS), the European Geostationary Navigation Overlay Service (EGNOS), the global differential GPS (GDGPS) system, are introduced in detail. The applications of GNSS technology and augmentation systems for space-time geodetic datum, high-precision positioning and location-based services (LBS) are summarized, providing a reference for GNSS engineers and users.

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Sánchez-Naranjo, Susana María, Nunzia Giorgia Ferrara, Maciej Jerzy Paśnikowski, Jussi Raasakka, Enik Shytermeja, Raúl Ramos-Pollán, Fabio Augusto González Osorio et al. "GNSS Vulnerabilities". In Multi-Technology Positioning, 55–77. Cham: Springer International Publishing, 2017. http://dx.doi.org/10.1007/978-3-319-50427-8_4.

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Demyanov, Vladislav. "GNSS Overview". In Space Weather Impact on GNSS Performance, 5–87. Cham: Springer International Publishing, 2022. http://dx.doi.org/10.1007/978-3-031-15874-2_2.

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Hernández-Pajares, Manuel. "GNSS Ionosphere". In Encyclopedia of Geodesy, 1–7. Cham: Springer International Publishing, 2022. http://dx.doi.org/10.1007/978-3-319-02370-0_172-1.

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Böhm, Johannes, e Henrik Vedel. "GNSS Meteorology". In Encyclopedia of Geodesy, 1–5. Cham: Springer International Publishing, 2015. http://dx.doi.org/10.1007/978-3-319-02370-0_7-1.

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Alves, Marcelo de Carvalho, e Luciana Sanches. "GNSS Surveying". In Surveying with Geomatics and R, 349–84. Boca Raton: CRC Press, 2022. http://dx.doi.org/10.1201/9781003184263-14.

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Chowdhury, Dhiman Deb. "GNSS Time". In NextGen Network Synchronization, 51–64. Cham: Springer International Publishing, 2021. http://dx.doi.org/10.1007/978-3-030-71179-5_4.

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Jamil, Abdullah. "Kebijakan Global Navigation Satellite System (GNSS) Negara Pengguna". In Kajian Kebijakan dan Informasi Kedirgantaraan, 93–115. Bogor: Mitra Wacana Media, 2015. http://dx.doi.org/10.30536/9786023181360.6.

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Teknologi GNSS semakin banyak digunakan untuk berbagai aplikasi seperti transportasi, pertambangan dan mitigasi bencana. GNSS saat ini telah banyak digunakan di berbagai negara seperti Amerika, Eropa dan Asia Pasifik. Dua negara asia pasifik yang telah banyak menggunakan teknologi GNSS adalah Australia dan Korea Selatan. Kajian ini bertujuan untuk mengetahui kebijakan GNSS di Australia dan Korea Selatan, kemudian membandingkannya dengan penerapannya di Indonesia. Metodologi yang digunakan dalam kajian ini adalah deskriptif dengan menjelaskan kebijakan-kebijakan GNSS yang dikeluarkan oleh Australia dan Korea Selatan kemudian membandingkannya dengan kebijakan GNSS yang dikeluarkan Indonesia. Hasilnya adalah Australia dan Korea Selatan telah mengeluarkan kebijakan GNSS baik terkait pengembangan maupun pemanfaatan GNSS sedangkan Indonesia hingga saat ini belum mempunyai kebijakan pengembangan GNSS. Akan tetapi, Indonesia juga telah mengeluarkan kebijakan terkait pemanfaatan GNSS meskipun masih dalam lingkup lembaga dan belum dibuat secara nasional.

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Jin, Shuanggen, R. Jin e X. Liu. "GNSS Tropospheric Sounding". In GNSS Atmospheric Seismology, 31–45. Singapore: Springer Singapore, 2019. http://dx.doi.org/10.1007/978-981-10-3178-6_3.

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Jin, Shuanggen, R. Jin e X. Liu. "GNSS Ionospheric Sounding". In GNSS Atmospheric Seismology, 47–73. Singapore: Springer Singapore, 2019. http://dx.doi.org/10.1007/978-981-10-3178-6_4.

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Atti di convegni sul tema "GNSS"

Palombo, Nola, e Keunhan Park. "Investigation of Dynamic Near-Field Radiation Between Quantum Dots and Plasmonic Nanoparticles for Effective Tailoring of Solar Spectrum". In ASME 2011 International Mechanical Engineering Congress and Exposition. ASMEDC, 2011. http://dx.doi.org/10.1115/imece2011-64561.

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This paper presents the theoretical and experimental studies of dynamic near-field interactions between quantum dots (QDs) and plasmonic gold nanoshell (GNS) nanoparticles suspended in an aquatic solution in attempts to effectively tailor the solar spectrum. The photoemission measurement of the CdTe QD/GNS nanofluid (1×1017 mL−1 for QDs and 5×108 mL−1 for GNSs) is amplified by 2.7 times when compared with the photoemission for QD-only solution with the same QD concentration. In order to investigate the mechanism of such enhancement, the direct simulation Monte Carlo (DSMC) numerical scheme combined with the Langevin formalism was developed. The modified DSMC can stochastically trace particle movements of QDs and GNSs in the nanofluid, suggesting that QDs within near-field of GNSs are responsible for the photoemission enhancement. The obtained results will provide the feasibility of using the dynamic near-field radiation to down-convert the solar spectrum with enhancement, which could be applied towards high-efficiency photovoltaics.

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Tian, Yusen, Xianyi Wang, Yueqiang Sun, Dongwei Wang, Chunjun Wu, Weihua Bai, Junming Xia e Qifei Du. "Multifunctional GNSS-R Processing Software FOR GNOS II". In IGARSS 2019 - 2019 IEEE International Geoscience and Remote Sensing Symposium. IEEE, 2019. http://dx.doi.org/10.1109/igarss.2019.8897997.

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Kurum, Mehmet, Md Mehedi Farhad e Dylan Boyd. "GNSS TRANSMISSOMETRY (GNSS-T): MODELING PROPAGATION OF GNSS SIGNALS THROUGH FOREST CANOPY". In IGARSS 2022 - 2022 IEEE International Geoscience and Remote Sensing Symposium. IEEE, 2022. http://dx.doi.org/10.1109/igarss46834.2022.9883361.

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Wong, Jun Kai, Robert Taylor, Sungchul Baek, Yasitha Hewakuruppu, Xuchuan Jiang e 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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Yin, Cong, Junming Xia, Feixiong Huang, Wei Li, Weihua Bai, Yueqiang Sun, Congliang Liu et al. "Sea Ice Detection with FY3E GNOS II GNSS Reflectometry". In 2021 IEEE Specialist Meeting on Reflectometry using GNSS and other Signals of Opportunity (GNSS+R). IEEE, 2021. http://dx.doi.org/10.1109/gnssr53802.2021.9617724.

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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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Bogdanov, Petr, Andrei Druzhin, Olga Nechaeva e Tatiana Primakina. "The Results of GNSS-GNSS Time Offsets Monitoring". In 2019 European Navigation Conference (ENC). IEEE, 2019. http://dx.doi.org/10.1109/euronav.2019.8714125.

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Novella, Guillaume, Axel J. Garcia -Pena, Christophe Macabiau, Anaïs Martineau, Pierre Ladoux, Philippe Estival e Olivier Troubet-Lacoste. "GNSS Acquisition Thresholds for Civil Aviation GNSS Receivers". In 35th International Technical Meeting of the Satellite Division of The Institute of Navigation (ION GNSS+ 2022). Institute of Navigation, 2022. http://dx.doi.org/10.33012/2022.18357.

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Yang, Liu, e Jin Tian. "Novel GNSS Signal Simulator for Next Generation GNSS". In 2007 International Conference on Wireless Communications, Networking and Mobile Computing. IEEE, 2007. http://dx.doi.org/10.1109/wicom.2007.305.

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D'Angelo, P., J. A. Pulido, T. Guardabrazo, P. Vieira, P. Silva e F. Amarillo. "GNSS Bias Calibration System: GNSS-BICS system prototype". 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.2012.6423112.

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Rapporti di organizzazioni sul tema "GNSS"

Lange, S., e J. Boike. GNSS measurements - new validation records and repetition. Natural Resources Canada/ESS/Scientific and Technical Publishing Services, 2019. http://dx.doi.org/10.4095/321050.

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Hu, G., e J. Dawson. The 2017 Australian GNSS CORS position verification analysis. Geoscience Australia, 2018. http://dx.doi.org/10.11636/record.2018.003.

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Donahue, B., J. Wentzel e R. Berg. Guidelines for RTK/RTN GNSS surveying in Canada. Natural Resources Canada/ESS/Scientific and Technical Publishing Services, 2013. http://dx.doi.org/10.4095/292856.

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Donahue, B., J. Wentzel e R. Berg. Guidelines for RTK/RTN GNSS surveying in Canada. Natural Resources Canada/CMSS/Information Management, 2015. http://dx.doi.org/10.4095/329628.

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Hu, G., A. Riddell e J. Dawson. Results of the National GNSS CORS Campaign, September 2014. Geoscience Australia, 2015. http://dx.doi.org/10.11636/record.2015.008.

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Habib, Ayman, Darcy M. Bullock, Yi-Chun Lin, Raja Manish e Radhika Ravi. Field Test Bed for Evaluating Embedded Vehicle Sensors with Indiana Companies. Purdue University, 2023. http://dx.doi.org/10.5703/1288284317385.

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With the advent of modern sensing technology, mapping products have begun to achieve an unprecedented precision of measurement. Considering their diverse use cases, several factors play a role in what would make the resulting measurements accurate. For light detection and ranging (LiDAR) and photogrammetry-based mapping solutions that implement vehicles outfitted with laser ranging devices, RGB cameras, and global navigation satellite system/inertial navigation system (GNSS/INS) georeferencing units, the quality of the derived mapping products is governed by the combined accuracy of the various sensors. While ranging errors associated with LiDAR systems or the imaging quality of RGB cameras are sensor-dependent and are mostly constant, the accuracy of a georeferencing unit depends on a variety of extrinsic factors, including but not limited to, availability of clear line-of-path to GNSS satellites and presence of radio interferences. The quality of the GNSS signal, in turn, is affected by the grade of hardware components used and, to a great extent, obstructions to signal reception. This document reports some of the major challenges of vehicle-based mobile mapping with regards to GNSS/INS navigation. The background of GNSS/INS positioning is discussed to build a framework for trajectory enhancement as well as improvement of LiDAR mapping products. The focus is put on using available sensor data from LiDAR and/or cameras to enhance their position/orientation quality. Some best practices in light of potential trajectory deterioration are also recommended.

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Nikitina, L., D. W. Danskin, R. Ghoddousi-Fard e P. Prikryl. Status of the existing monitoring and forecasts for GNSS systems. Natural Resources Canada/ESS/Scientific and Technical Publishing Services, 2015. http://dx.doi.org/10.4095/296982.

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Hu, G., S. McClusky, R. Ruddick e A. Peterson. Evaluation of Geoscience Australia’s proposed GNSS CORS antenna mount adaptors. Geoscience Australia, 2022. http://dx.doi.org/10.11636/record.2022.008.

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Elliot, P. G., E. N. Rosario e R. J. Davis. Novel Quadrifilar Helix Antenna Combining GNSS, Iridium, and a UHF Communications Monopole. Fort Belvoir, VA: Defense Technical Information Center, aprile 2012. http://dx.doi.org/10.21236/ada562143.

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Ghoddousi-Fard, R. An investigation on the GNSS ionospheric mapping-functions uncertainties using NeQuick model. Natural Resources Canada/ESS/Scientific and Technical Publishing Services, 2020. http://dx.doi.org/10.4095/326084.

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