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Articoli di riviste sul tema "GNSS"

Autore: Grafiati

Pubblicato: 4 giugno 2021

Ultima modifica: 25 luglio 2025

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1

Yang, Lijie, Jinhua Wang, Liying Sun, Yisi Zhang, Peng Huang, and Junfeng Guo. "Comparison of Gold Nanospheres, Nanorods, Nanocages and Nanoflowers for Combined Photothermal-Radiotherapy of Cancer." Nano 16, no. 04 (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

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Yang, Guanglin, Weihua Bai, Jinsong Wang, et al. "FY3E GNOS II GNSS Reflectometry: Mission Review and First Results." Remote Sensing 14, no. 4 (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

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3

Kim, Phillip, and Junhee Youn. "Drone Path Planning for Bridge Substructure Inspection Considering GNSS Signal Shadowing." Drones 9, no. 2 (2025): 124. https://doi.org/10.3390/drones9020124.

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Drones are useful tools for performing tasks that are difficult for humans. Thus, they are being increasingly utilized in various fields. In smart construction, a range of methods, including robots and drones, has been proposed to inspect facilities and other similar structures. Global navigation satellite system (GNSS) shadowing can occur when large bridge substructures, which are difficult for humans to access, are inspected using drones because GNSS is a major component in drone operation. This study develops a path planning algorithm to address areas with GNSS shadowing. The operation mode

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4

Wang, Xiaocui, Guohua Li, Yu Ding, and Shuqing Sun. "Understanding the photothermal effect of gold nanostars and nanorods for biomedical applications." RSC Adv. 4, no. 57 (2014): 30375–83. http://dx.doi.org/10.1039/c4ra02978j.

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Yasyukevich, Yury V., Baocheng Zhang, and Venkata Ratnam Devanaboyina. "Advances in GNSS Positioning and GNSS Remote Sensing." Sensors 24, no. 4 (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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6

Shan, Feng, Jingyi Huang, Yanyan Zhu, and Guohao Wei. "Photo-Thermal Conversion and Raman Sensing Properties of Three-Dimensional Gold Nanostructure." Molecules 29, no. 18 (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 the

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7

Gu, Nianzu, Fei Xing, and Zheng You. "GNSS Spoofing Detection Based on Coupled Visual/Inertial/GNSS Navigation System." Sensors 21, no. 20 (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

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8

Zubinaitė, Vilma, and George Preiss. "A PROPOSED SIMPLIFIED TECHNIQUE FOR CONFIRMING HIGH PRECISION GNSS ANTENNA OFFSETS." Aviation 14, no. 3 (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. Thes

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9

Qiu, Tongsheng, Xianyi Wang, Yueqiang Sun, et al. "An Innovative Signal Processing Scheme for Spaceborne Integrated GNSS Remote Sensors." Remote Sensing 15, no. 3 (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

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10

Magny, Jean Pierre. "Application of Satellite Based Augmentation Systems to Altitude Separation." Journal of Navigation 52, no. 3 (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 d

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11

Huang, Zhenchuan, Shuanggen Jin, Ke Su, and Xu Tang. "Multi-GNSS Precise Point Positioning with UWB Tightly Coupled Integration." Sensors 22, no. 6 (2022): 2232. http://dx.doi.org/10.3390/s22062232.

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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

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12

Guerova, Guergana, Jonathan Jones, Jan Douša, et al. "Review of the state of the art and future prospects of the ground-based GNSS meteorology in Europe." Atmospheric Measurement Techniques 9, no. 11 (2016): 5385–406. http://dx.doi.org/10.5194/amt-9-5385-2016.

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Abstract. Global navigation satellite systems (GNSSs) have revolutionised positioning, navigation, and timing, becoming a common part of our everyday life. Aside from these well-known civilian and commercial applications, GNSS is now an established atmospheric observing system, which can accurately sense water vapour, the most abundant greenhouse gas, accounting for 60–70 % of atmospheric warming. In Europe, the application of GNSS in meteorology started roughly two decades ago, and today it is a well-established field in both research and operation. This review covers the state of the art in

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13

Bai, Weihua, Guojun Wang, Yueqiang Sun, et al. "Application of the Fengyun 3 C GNSS occultation sounder for assessing the global ionospheric response to a magnetic storm event." Atmospheric Measurement Techniques 12, no. 3 (2019): 1483–93. http://dx.doi.org/10.5194/amt-12-1483-2019.

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Abstract. The rapid advancement of global navigation satellite system (GNSS) occultation technology in recent years has made it one of the most advanced space-based remote sensing technologies of the 21st century. GNSS radio occultation has many advantages, including all-weather operation, global coverage, high vertical resolution, high precision, long-term stability, and self-calibration. Data products from GNSS occultation sounding can greatly enhance ionospheric observations and contribute to space weather monitoring, forecasting, modeling, and research. In this study, GNSS occultation soun

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14

Zhao, Qingzhi, Kefei Zhang, and Wanqiang Yao. "Influence of station density and multi-constellation GNSS observations on troposphere tomography." Annales Geophysicae 37, no. 1 (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, an

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15

Punzet, Stefan, and Thomas F. Eibert. "Impact of Additional Antenna Groundplanes on RTK-GNSS Positioning Accuracy of UAVs." Advances in Radio Science 20 (March 21, 2023): 23–28. http://dx.doi.org/10.5194/ars-20-23-2023.

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Abstract. Precise position information is important for terrestrial and airborne surveying systems, such as unmanned aerial vehicles (UAVs). Those systems often rely on real-time kinematic (RTK) global navigation satellite systems (GNSSs) for position determination, where the GNSS antenna mounting environment impacts the GNSS position accuracy to a great extent. This paper investigates the impact of different supplementary groundplane shapes, sizes, and materials on multi-band patch and helical GNSS antennas at both, the UAV rover and RTK base station with respect to the achievable position ac

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16

Yin, Cong, Feixiong Huang, Junming Xia, et al. "Soil Moisture Retrieval from Multi-GNSS Reflectometry on FY-3E GNOS-II by Land Cover Classification." Remote Sensing 15, no. 4 (2023): 1097. http://dx.doi.org/10.3390/rs15041097.

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The reflected GNSS signals at the L-band is significantly advantageous in soil moisture monitoring as they are sensitive to the dielectric properties determined by the volumetric water content of topsoil, and they can penetrate vegetation, except in very dense forests. The Global Navigation satellite system Occultation Sounder (GNOS-II) with a reflectometry technique onboard the Fengyun-3E (FY-3E) satellite, launched on 5 July 2021, is the first mission that can receive reflected Global Navigation Satellite System (GNSS) signals from GPS, BeiDou and Galileo systems. This paper presents the soi

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17

Yang, Guanglin, Xiaoyong Du, Lingyong Huang, et al. "An Illustration of FY-3E GNOS-R for Global Soil Moisture Monitoring." Sensors 23, no. 13 (2023): 5825. http://dx.doi.org/10.3390/s23135825.

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An effective soil moisture retrieval method for FY-3E (Fengyun-3E) GNOS-R (GNSS occultation sounder II-reflectometry) is developed in this paper. Here, the LAGRS model, which is totally oriented for GNOS-R, is employed to estimate vegetation and surface roughness effects on surface reflectivity. Since the LAGRS (land surface GNSS reflection simulator) model is a space-borne GNSS-R (GNSS reflectometry) simulator based on the microwave radiative transfer equation model, the method presented in this paper takes more consideration on the physical scattering properties for retrieval. Ancillary info

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18

Liu, Congliang, Yueqiang Sun, Weihua Bai, et al. "Effect of Multiple GNSS Integration on the Number and Spatiotemporal Coverage of Radio Occultation Events." Atmosphere 13, no. 5 (2022): 654. http://dx.doi.org/10.3390/atmos13050654.

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The development of global navigation satellite systems (GNSSs) and multi-system compatible radio occultation (RO) techniques provides favorable conditions and opportunities for increasing the number of occultation events and improving their spatiotemporal coverage. The performance of the multiple GNSS RO event number, spatiotemporal coverage, and uniformity need assessments by robust and functional approaches. Firstly, a simulation system of RO events, which took the orbit perturbations into account, was established, and the concepts of global coverage fraction and uniformity of RO events were

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19

Ji, Gun-Hoon, Ki-Ho Kwon, and Jong-Hoon Won. "GNSS Signal Availability Analysis in SSV for Geostationary Satellites Utilizing multi-GNSS with First Side Lobe Signal over the Korean Region." Remote Sensing 13, no. 19 (2021): 3852. http://dx.doi.org/10.3390/rs13193852.

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This paper verifies the applicability of multiple Global Navigation Satellite Systems (GNSSs) and side lobe signal utilization in Space Service Volume (SSV), especially for Geostationary Earth Orbit (GEO) missions over the Korean region. Unlike the ground or terrestrial systems, various constraints of space exploration in SSV cause a problem when estimating position using GNSS. This is mainly due to the limit of GNSS signal availability where its dominant variables include altitude, side lobe issues, as well as longitude because of different constellations of several GNSS. The numerical simula

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20

Capuano, Vincenzo, Francesco Basile, Cyril Botteron, and Pierre André Farine. "GNSS-based Orbital Filter for Earth Moon Transfer Orbits." Journal of Navigation 69, no. 4 (2015): 745–64. http://dx.doi.org/10.1017/s0373463315000843.

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Numerous applications, not only Earth-based, but also space-based, have strengthened the interest of the international scientific community in using Global Navigation Satellite Systems (GNSSs) as navigation systems for space missions that require good accuracy and low operating costs. Indeed, already successfully used in Low Earth Orbits (LEOs), GNSS-based navigation systems can maximise the autonomy of a spacecraft while reducing the burden and the costs of ground operations. That is why GNSS is also attractive for applications in higher Earth orbits up to the Moon, such as in Moon Transfer O

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21

Popov, Petrica, Maria Emanuela Mihailov, Lucian Dutu, and Dumitru Andrescu. "Enhancing Maritime Navigation: A Global Navigation Satellite System (GNSS) Signal Quality Monitoring System for the North-Western Black Sea." Atmosphere 16, no. 5 (2025): 500. https://doi.org/10.3390/atmos16050500.

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Global Navigation Satellite Systems (GNSSs) are the primary source of information for Positioning, Navigation, and Timing (PNT) in the maritime sector; however, they are vulnerable to unintentional or deliberate interference, such as jamming, spoofing, or meaconing. The continuous monitoring of GNSS signals is crucial for vessels and mobile maritime platforms to ensure the integrity, availability, and accuracy of positioning and navigation services. This monitoring is essential for guaranteeing the safety and security of navigation and contributes to the accurate positioning of vessels and pla

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22

Sun, Yueqiang, Weihua Bai, Congliang Liu, et al. "The FengYun-3C radio occultation sounder GNOS: a review of the mission and its early results and science applications." Atmospheric Measurement Techniques 11, no. 10 (2018): 5797–811. http://dx.doi.org/10.5194/amt-11-5797-2018.

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Abstract. The Global Navigation Satellite System (GNSS) Occultation Sounder (GNOS) is one of the new-generation payloads on board the Chinese FengYun 3 (FY-3) series of operational meteorological satellites for sounding the Earth's neutral atmosphere and ionosphere. FY-3C GNOS, on board the FY-3 series C satellite launched in September 2013, was designed to acquire setting and rising radio occultation (RO) data by using GNSS signals from both the Chinese BeiDou Navigation Satellite System (BDS) and the US Global Positioning System (GPS). So far, the GNOS measurements and atmospheric and ionosp

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23

Han, Yi, Jia Luo, and Xiaohua Xu. "On the Constellation Design of Multi-GNSS Reflectometry Mission Using the Particle Swarm Optimization Algorithm." Atmosphere 10, no. 12 (2019): 807. http://dx.doi.org/10.3390/atmos10120807.

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Due to the great success of the CYclone Global Navigation Satellite System (CYGNSS) mission, the follow-on GNSS Reflectometry (GNSS-R) missions are being planned. In the perceivable future, signal sources for GNSS-R missions can originate from multiple global navigation satellite systems (GNSSs) including Global Positioning System (GPS), Galileo, GLONASS, and BeiDou. On the other hand, to facilitate the operational capability for sensing ocean, land, and ice features globally, multi-satellite low Earth orbit (LEO) constellations with global coverage and high spatio-temporal resolutions should

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24

Duong, Thanh Trung, Kai-Wei Chiang, and Dinh Thuan Le. "On-line Smoothing and Error Modelling for Integration of GNSS and Visual Odometry." Sensors 19, no. 23 (2019): 5259. http://dx.doi.org/10.3390/s19235259.

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Global navigation satellite systems (GNSSs) are commonly used for navigation and mapping applications. However, in GNSS-hostile environments, where the GNSS signal is noisy or blocked, the navigation information provided by a GNSS is inaccurate or unavailable. To overcome these issues, this study proposed a real-time visual odometry (VO)/GNSS integrated navigation system. An on-line smoothing method based on the extended Kalman filter (EKF) and the Rauch-Tung-Striebel (RTS) smoother was proposed. VO error modelling was also proposed to estimate the VO error and compensate the incoming measurem

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Zou, Zixuan, Guoshuai Wang, Zhenshuo Li, Rui Zhai, and Yonghua Li. "MFO-Fusion: A Multi-Frame Residual-Based Factor Graph Optimization for GNSS/INS/LiDAR Fusion in Challenging GNSS Environments." Remote Sensing 16, no. 17 (2024): 3114. http://dx.doi.org/10.3390/rs16173114.

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In various practical applications, such as autonomous vehicle and unmanned aerial vehicle navigation, Global Navigation Satellite Systems (GNSSs) are commonly used for positioning. However, traditional GNSS positioning methods are often affected by disturbances due to external observational conditions. For instance, in areas with dense buildings, tree cover, or tunnels, GNSS signals may be obstructed, resulting in positioning failures or decreased accuracy. Therefore, improving the accuracy and stability of GNSS positioning in these complex environments is a critical concern. In this paper, we

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Zmysłowski, Dariusz, Michał Kryk, and Jan Kelner. "TESTING GNSS RECEIVER ROBUSTNESS FOR JAMMING." Aviation and Security Issues 4, no. 2 (2023): 139–55. http://dx.doi.org/10.55676/asi.v4i2.64.

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Global Navigation Satellite Systems (GNSSs) providing positioning, navigation and synchronization, has become an important element of modern systems and devices that have a crucial impact on many economy branches and the life of an common person. Literature analysis and reports from recent armed conflicts show that the use of techniques for jamming and spoofing GNSS signals is becoming increasingly. This reduces the level of safety in transport and increases the risk of improper operation of GNSS-based systems, like cellular telephony or bank sector. This paper focuses on the methodology for t

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Zharkov, Maksim, Konstantin Veremeenko, Ivan Kuznetsov, and Andrei Pronkin. "Global Navigation Satellite System Spoofing Detection in Inertial Satellite Navigation Systems." Inventions 8, no. 6 (2023): 158. http://dx.doi.org/10.3390/inventions8060158.

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The susceptibility of global navigation satellite systems (GNSSs) to interference significantly limits the possibility of their use. From the standpoint of possible consequences, the most dangerous interference is the so-called spoofing. Simultaneously, in most cases of GNSS use, an inertial navigation system (INS) or an attitude and heading reference system (AHRS) is also present on the board of mobile objects. In this regard, the research goal is to assess the possibility of detecting GNSS spoofing in inertial satellite navigation systems. This paper examines the method for detecting GNSS sp

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Zhang, Pengfei, Rui Tu, Yuping Gao, Rui Zhang, and Na Liu. "Improving the Performance of Multi-GNSS Time and Frequency Transfer Using Robust Helmert Variance Component Estimation." Sensors 18, no. 9 (2018): 2878. http://dx.doi.org/10.3390/s18092878.

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The combination of multiple Global Navigation Satellite Systems (GNSSs) may improve the performance of time and frequency transfers by increasing the number of available satellites and improving the time dilution of precision. However, the receiver clock estimation is easily affected by the inappropriate weight of multi-GNSSs due to the different characteristics of individual GNSS signals as well as the outliers from observations. Thus, we utilised a robust Helmert variance component estimation (RVCE) approach to determine the appropriate weights of different GNSS observations, and to control

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Luo, Yiran, Li-Ta Hsu, Yang Jiang, et al. "High-Accuracy Absolute-Position-Aided Code Phase Tracking Based on RTK/INS Deep Integration in Challenging Static Scenarios." Remote Sensing 15, no. 4 (2023): 1114. http://dx.doi.org/10.3390/rs15041114.

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Many multi-sensor navigation systems urgently demand accurate positioning initialization from global navigation satellite systems (GNSSs) in challenging static scenarios. However, ground blockages against line-of-sight (LOS) signal reception make it difficult for GNSS users. Steering local codes in GNSS basebands is a desirable way to correct instantaneous signal phase misalignment, efficiently gathering useful signal power and increasing positioning accuracy. Inertial navigation systems (INSs) have been used as effective complementary dead reckoning (DR) sensors for GNSS receivers in kinemati

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Ziebold, Ralf, Daniel Medina, Michailas Romanovas, Christoph Lass, and Stefan Gewies. "Performance Characterization of GNSS/IMU/DVL Integration under Real Maritime Jamming Conditions." Sensors 18, no. 9 (2018): 2954. http://dx.doi.org/10.3390/s18092954.

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Currently Global Navigation Satellite Systems (GNSSs) are the primary source for the determination of absolute position, navigation, and time (PNT) for merchant vessel navigation. Nevertheless, the performance of GNSSs can strongly degrade due to space weather events, jamming, and spoofing. Especially the increasing availability and adoption of low cost jammers lead to the question of how a continuous provision of PNT data can be realized in the vicinity of these devices. In general, three possible solutions for that challenge can be seen: (i) a jamming-resistant GNSS receiver; (ii) the usage

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Lackowski, Maciej, Kamil Kaźmierski, and Iwona Kudłacik. "Using GNSS Phase Observation Residuals and Wavelet Analysis to Detect Earthquakes." Artificial Satellites 58, no. 4 (2023): 341–54. http://dx.doi.org/10.2478/arsa-2023-0014.

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Abstract Global Navigation Satellite Systems (GNSSs) are one of the techniques that can be used for the deformation monitoring caused by earthquakes. GNSSs enable the monitoring of specific areas affected by earthquakes in real-time and post-processing modes. This paper provides a novel method for the short-term displacement detection based on the phase residuals of GNSS observations. The study examines a natural earthquake from October 26, 2016, in Italy with Mw 6.1. In the proposed methodology, the residuals of the GNSS phase observations are derived using Precise Point Positioning. Then, re

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Bai, W. H., Y. Q. Sun, Q. F. Du, et al. "An introduction to the FY3 GNOS instrument and mountain-top tests." Atmospheric Measurement Techniques 7, no. 6 (2014): 1817–23. http://dx.doi.org/10.5194/amt-7-1817-2014.

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Abstract. The FY3 (Feng-Yun-3) GNOS (GNSS Occultation Sounder) mission is a GNSS (Global Navigation Satellite System) radio occultation mission of China for remote sensing of Earth's neutral atmosphere and the ionosphere. GNOS will use both the global positioning system (GPS) and the Beidou navigation satellite systems on the China Feng-Yun-3 (FY3) series satellites. The first FY3-C was launched at 03:07 UTC on 23 September 2013. GNOS was developed by the Center for Space Science and Applied Research, Chinese Academy of Sciences (CSSAR). It will provide vertical profiles of atmospheric tempera

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Bai, W., Y. Sun, Q. Du, et al. "An introduction to FY3 GNOS instrument and its performace tested on ground." Atmospheric Measurement Techniques Discussions 7, no. 1 (2014): 703–26. http://dx.doi.org/10.5194/amtd-7-703-2014.

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Abstract. The FY3 GNOS (GNSS Occultation Sounder) mission is a GNSS (Global Navigation Satellite System) radio occultation mission of China for remote sensing of Earth's neutral atmosphere and the ionosphere. GNOS will use both the Global Positioning System (GPS) and the Beidou navigation satellite systems on the China Feng-Yun-3 (FY3) series satellites. The first FY3-C was launched at 03:03 UTC, 23 September 2013. GNOS was developed by Center for Space Science and Applied Research, Chinese Academy of Sciences (CSSAR). It will provide vertical profiles of atmospheric temperature, pressure, and

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Retscher, Günther, Daniel Kiss, and Jelena Gabela. "Fusion of GNSS Pseudoranges with UWB Ranges Based on Clustering and Weighted Least Squares." Sensors 23, no. 6 (2023): 3303. http://dx.doi.org/10.3390/s23063303.

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Global navigation satellite systems (GNSSs) and ultra-wideband (UWB) ranging are two central research topics in the field of positioning and navigation. In this study, a GNSS/UWB fusion method is investigated in GNSS-challenged environments or for the transition between outdoor and indoor environments. UWB augments the GNSS positioning solution in these environments. GNSS stop-and-go measurements were carried out simultaneously to UWB range observations within the network of grid points used for testing. The influence of UWB range measurements on the GNSS solution is examined with three weight

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Nijak, Mateusz, Piotr Skrzypczyński, Krzysztof Ćwian, Michał Zawada, Sebastian Szymczyk, and Jacek Wojciechowski. "On the Importance of Precise Positioning in Robotised Agriculture." Remote Sensing 16, no. 6 (2024): 985. http://dx.doi.org/10.3390/rs16060985.

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The precision of agro-technical operations is one of the main hallmarks of a modern approach to agriculture. However, ensuring the precise application of plant protection products or the performance of mechanical field operations entails significant costs for sophisticated positioning systems. This paper explores the integration of precision positioning based on the global navigation satellite system (GNSS) in agriculture, particularly in fieldwork operations, seeking solutions of moderate cost with sufficient precision. This study examines the impact of GNSSs on automation and robotisation in

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Huang, Panpan, Chris Rizos, and Craig Roberts. "Airborne Pseudolite Distributed Positioning based on Real-time GNSS PPP." Journal of Navigation 72, no. 5 (2019): 1159–78. http://dx.doi.org/10.1017/s0373463319000213.

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Airborne-Pseudolite (A-PL) systems have been proposed to augment Global Navigation Satellite Systems (GNSSs) in difficult areas where GNSS-only navigation cannot be guaranteed due to signal blockages, signal jamming, etc. One of the challenges in realising such a system is to determine the coordinates of the A-PLs to a high accuracy. The GNSS Precise Point Positioning (PPP) technique is a possible alternative to differential GNSS techniques such as those that generate Real-Time Kinematic (RTK) solutions. To enhance the A-PL positioning performance in GNSS challenged areas, it is assumed that i

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Kim, Hanjin, Chang-Uk Hyun, Hyeong-Dong Park, and Jongmun Cha. "Image Mapping Accuracy Evaluation Using UAV with Standalone, Differential (RTK), and PPP GNSS Positioning Techniques in an Abandoned Mine Site." Sensors 23, no. 13 (2023): 5858. http://dx.doi.org/10.3390/s23135858.

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Abstract (sommario):

Global navigation satellite systems (GNSSs) provide a common positioning method that utilizes satellite signals to determine the spatial location of a receiver. However, there are several error factors in standalone GNSS positioning due to instrumental, procedural, and environmental factors that arise during the signal transmission process, and the final positioning error can be up to several meters or greater in length. Thus, real-time kinematic (RTK) correction and post-mission precise point positioning (PPP) processing technologies are proposed to improve accuracy and accomplish precise pos

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Zhang, Wang Xun, Hong Tao Hou, Pai Peng, and Wei Ping Wang. "Modeling and Analysis of the Threats to GNSS." Advanced Materials Research 694-697 (May 2013): 2587–92. http://dx.doi.org/10.4028/www.scientific.net/amr.694-697.2587.

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Abstract (sommario):

The vulnerability of the global navigation satellite systems (GNSS) makes it susceptible to a variety of threats, so it is significant to study the effects of each threat on GNSS performance. To analyze the impacts of different threats, a dynamic master logic diagram (DMLD) based modeling and analysis method was presented. First the relationships between threats and GNSS performance were built through a quadric associations by DMLD symbols, then qualitative and quantitative analysis was done via DMLDs great reasoning power, at last qualitative and quantitative analysis could show engineers and

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Cui, Bingbo, Wu Chen, Duojie Weng, et al. "Observability-Constrained Resampling-Free Cubature Kalman Filter for GNSS/INS with Measurement Outliers." Remote Sensing 15, no. 18 (2023): 4591. http://dx.doi.org/10.3390/rs15184591.

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Abstract (sommario):

Integrating global navigation satellite systems (GNSSs) with inertial navigation systems (INSs) has been widely recognized as an ideal solution for autonomous vehicle navigation. However, GNSSs suffer from disturbances and signal blocking inevitably, making the performance of GNSS/INSs degraded in the occurrence of measurement outliers. It has been proven that the sigma points-based Kalman filter (KF) performs better than an extended KF in cases where large prior uncertainty is present in the state estimation of a GNSS/INS. By modifying the sigma points directly, the resampling-free sigma poin

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Goldberg, Dara E., and Kirstie L. Haynie. "Ready for Real Time: Performance of Global Navigation Satellite System in 2019 Mw 7.1 Ridgecrest, California, Rapid Response Products." Seismological Research Letters 93, no. 2A (2022): 517–30. http://dx.doi.org/10.1785/0220210278.

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Abstract (sommario):

Abstract Global Navigation Satellite Systems (GNSSs) have undergone notable advancement in the last few decades, leading to the availability of a dataset with capabilities well beyond its original intended purpose. The proliferation of high-rate (1 Hz or greater) GNSS receivers in areas of seismological interest now allows for routine consideration of dynamic earthquake ground motions, with centimeter-level displacement accuracy via precise point positioning methods. Real-time (RT) GNSS observations, from stations that are both telemetered and processed to displacement with minimal latency, ha

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Sun, Yueqiang, Feixiong Huang, Junming Xia, et al. "GNOS-II on Fengyun-3 Satellite Series: Exploration of Multi-GNSS Reflection Signals for Operational Applications." Remote Sensing 15, no. 24 (2023): 5756. http://dx.doi.org/10.3390/rs15245756.

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Abstract (sommario):

The Global Navigation Satellite System Occultation Sounder II (GNOS-II) payload onboard the Chinese Fengyun-3E (FY-3E) satellite is the world’s first operational spaceborne mission that can utilize reflected signals from multiple navigation systems for Earth remote sensing. The satellite was launched into an 836-km early-morning polar orbit on 5 July 2021. Different GNSS signals show different characteristics in the observations and thus require different calibration methods. With an average data latency of less than 3 h, many near real-time applications are possible. This article first introd

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Lu, Yangyang, Hu Yang, Bo Li, Jun Li, Aigong Xu, and Mingze Zhang. "Analysis of Characteristics for Inter-System Bias on Multi-GNSS Undifferenced and Uncombined Precise Point Positioning." Remote Sensing 15, no. 9 (2023): 2252. http://dx.doi.org/10.3390/rs15092252.

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Abstract (sommario):

Multi Global Navigation Satellite System (GNSS) Precise Point Positioning (PPP) has become the mainstream of PPP technology. Due to the differences in the coordinates and time references of each GNSS, multi-GNSS PPP must include additional Inter-System Bias (ISB) parameters to ensure compatibility between different GNSSs. Therefore, research on the characteristics of ISB is also essential. To analyze the short- and long-term time characteristics of multi-GNSS ISBs, as well as their relationship with receiver type and receiver antenna type, the Undifferenced and Uncombined (UDUC) PPP model of G

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Elhalawany, Noha Ragab, Brian Enders, Ersin Bahceci, and Munir Nayfeh. "Novel synthetic route for growth of gold nanorods via semiconductor procedure." Materials Physics and Chemistry 1, no. 2 (2019): 20. http://dx.doi.org/10.18282/mpc.v1i2.573.

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Abstract (sommario):

<p>We represent here a novel facile synthesis type route based on semiconductor procedure for growth of gold nanorods GNRs using infinitesimal silicon nanoparticles USSiN. The reaction takes place immediately upon mixing monodispersed hydrogen terminated USSiN of 2.9 nm diameter with auric acid HAuCl4 in presence and in absence of an emulsifier. The resulting colloids have been characterized via scanning electron microscope SEM, Energy dispersive spectrometry EDS and optical microscope OM. Photo-luminesence (PL) measurements have been also carried out. Our results show formation of gold

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Hernando-Ramiro, Carlos, Óscar Gamallo-Palomares, Javier Junquera-Sánchez, and José Antonio Gómez-Sánchez. "Time to First Fix Robustness of Global Navigation Satellite Systems: Comparison Study." Sensors 25, no. 5 (2025): 1599. https://doi.org/10.3390/s25051599.

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Abstract (sommario):

The time to first fix (TTFF) measures the time elapsed by a global navigation satellite system (GNSS) receiver from switch-on to provision of a navigation solution. This parameter is crucial for applications where a position, within an acceptable error, is needed as soon as possible after turning the device on. The quality of the TTFF depends mainly on the receiver, the environment, and the GNSS satellites employed. Although all four available GNSSs (BeiDou, Galileo, GLONASS, and GPS) are complementary, their constellations and signals differ, providing different TTFF performances. This become

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Zhang, Jinglei, Xiaoming Wang, Zishen Li, et al. "The Impact of Different Ocean Tide Loading Models on GNSS Estimated Zenith Tropospheric Delay Using Precise Point Positioning Technique." Remote Sensing 12, no. 18 (2020): 3080. http://dx.doi.org/10.3390/rs12183080.

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Abstract (sommario):

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

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Zhang, Zhetao, Guorui Xiao, Zhixi Nie, Vagner Ferreira, and Giuseppe Casula. "High-Precision and High-Reliability Positioning, Navigation, and Timing: Opportunities and Challenges." Remote Sensing 16, no. 23 (2024): 4403. http://dx.doi.org/10.3390/rs16234403.

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Abstract (sommario):

The research scope of the papers published in this Special Issue mainly focuses on high-precision and high-reliability positioning, navigation, and timing (PNT) with Global Navigation Satellite System (GNSS) or multi-source sensors, resilient PNT with GNSSs or multi-source sensors in challenging environments, integrated PNT with GNSSs and multi-sensor systems, applications of PNT with GNSSs or multi-source sensors, etc.

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Egea-Roca, Daniel, Antonio Tripiana-Caballero, José López-Salcedo, et al. "Design, Implementation and Validation of a GNSS Measurement Exclusion and Weighting Function with a Dual Polarized Antenna." Sensors 18, no. 12 (2018): 4483. http://dx.doi.org/10.3390/s18124483.

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Abstract (sommario):

Global Navigation Satellite Systems (GNSSs) have become a ubiquitous tool for our modern society to carry out vital tasks such as transportation, civil engineering or precision agriculture. This breath has reached the realm of safety-critical applications such as time management of critical infrastructures or autonomous vehicles, in which GNSS is an essential tool nowadays. Unfortunately, current GNSS performance is not enough to fulfill the requirements of these professional and critical applications. For this reason, the FANTASTIC project was launched to boost the adoption of these applicati

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Ngoc, Quang Vu, and Hoa Nguyen Thanh. "Processing Small GNSS Networks using GNSS Systems." Journal of Scientific and Engineering Research 8, no. 4 (2021): 7–12. https://doi.org/10.5281/zenodo.10579284.

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Abstract (sommario):

<strong>Abstract</strong> For decades, positioning accuracy via satellite technology was mainly based on the Global Positioning System of the USA and a little support from GLONASS. Due to the development of new GNSS systems and the new brand of GNSS receivers, users have much more options in GNSS data processing. This paper is an experimental study on GNSS data processing using different systems. In the research, GNSS data were obtained from a set of Trimble R8s devices including three multi-frequency and multi-channel receivers. GNSS data were calculated with three small networks using Trimbl

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Yashchyshyn, Yevhen, Dmytro Vynnyk, Volodymyr Haiduchok, et al. "A Tunable and Electrically Small Antenna for Compact GNSS Receivers." Remote Sensing 13, no. 3 (2021): 485. http://dx.doi.org/10.3390/rs13030485.

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Abstract (sommario):

The electronic receivers of global navigation satellite systems (GNSSs) are implemented in various handheld electronic devices such as laptops, smartphones, and smartwatches; therefore, their dimensions are of critical importance. Achieving a GNSS terminal of a small size is difficult due to its relatively low operational frequency (L-band), which is equivalent to a wavelength of approximately 24 cm. As an efficient half-wavelength antenna is too large for compact devices, in this paper, an electrically small antenna (ESA) for GNSS terminals is presented. The antenna was miniaturized by using

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Cățeanu, Mihnea, and Maria Alexandra Moroianu. "Performance Evaluation of Real-Time Kinematic Global Navigation Satellite System with Survey-Grade Receivers and Short Observation Times in Forested Areas." Sensors 24, no. 19 (2024): 6404. http://dx.doi.org/10.3390/s24196404.

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Abstract (sommario):

The Real-Time Kinematic (RTK) method is currently the most widely used method for positioning using Global Navigation Satellite Systems (GNSSs) due to its accuracy, efficiency and ease of use. In forestry, position is a critical factor for numerous applications, with GNSS currently being the preferred solution for obtaining such data. However, the decreased performance of GNSS observations in challenging environments, such as under the forest canopy, must be considered. This paper analyzes the performance of a survey-grade GNSS receiver under coniferous/deciduous tree cover. Unlike most previo

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