Results 31 to 40 of about 1,420 (154)

Analysis of the precision of determination of aircraft coordinates using EGNOS+SDCM solution [PDF]

Archives of Transport, 2023
This paper presents an algorithm for determining the precision parameter for aircraft position coordinates based on a combined GPS/EGNOS and GPS/SDCM solution. The proposed algorithm uses a weighted average model that com-bines a single GPS/EGNOS and GPS/
Kamil Krasuski, Marta Lalak, Paweł Gołda, Adam Ciećko, Grzegorz Grunwald, Magda Mrozik, Jarosław Kozuba   +6 more
doaj   +1 more source

GPS‐SBAS‐Based Orbit Determination for Low Earth Orbiting Satellites

International Journal of Aerospace Engineering, Volume 2023, Issue 1, 2023., 2023
A space‐based augmentation system (SBAS) provides real‐time GNSS correction signals via geostationary satellites for near‐ground GNSS users. To use the SBAS correction for low Earth orbit (LEO) satellites, the correction, especially the ionosphere correction, must be adjusted for the LEO altitude.
Mingyu Kim, Jeongrae Kim, Enrico C. Lorenzini   +2 more
wiley   +1 more source

Holocene lake‐level evolution of Lake Tiefer See, NE Germany, caused by climate and land cover changes

Boreas, Volume 51, Issue 2, Page 299-316, April 2022., 2022
Lake‐level reconstructions are a key tool in hydro‐climate reconstructions, based on the assumption that lake‐level changes primarily reflect climatic changes. Although it is known that land cover changes can affect evapotranspiration and groundwater formation, this factor commonly receives little attention in the interpretation of past lake‐level ...
Martin Theuerkauf, Theresa Blume, Achim Brauer, Nadine Dräger, Peter Feldens, Knut Kaiser, Christoph Kappler, Frederike Kästner, Sebastian Lorenz, Jens‐Peter Schmidt, Manuela Schult   +10 more
wiley   +1 more source

A New Way of Estimating the Spatial and Temporal Components of the Vertical Total Electron Content Gradient Based on UPC‐IonSAT Global Ionosphere Maps

Space Weather, Volume 20, Issue 2, February 2022., 2022
Abstract The determination of the ionospheric perturbation degree is essential to describe the ionosphere state for space weather monitoring. A new method for estimating the spatial and temporal components of the Vertical Total Electron Content (VTEC) gradient is introduced.
Qi Liu, Manuel Hernández‐Pajares, Heng Yang, Enric Monte‐Moreno, Alberto García‐Rigo, Haixia Lyu, Germán Olivares‐Pulido, Raül Orús‐Pérez   +7 more
wiley   +1 more source

Markov Chain‐Based Stochastic Modeling of Deep Signal Fading: Availability Assessment of Dual‐Frequency GNSS‐Based Aviation Under Ionospheric Scintillation

Space Weather, Volume 19, Issue 9, September 2021., 2021
Abstract Deep signal fading due to ionospheric scintillation severely impacts global navigation satellite system (GNSS)‐based applications. GNSS receivers run the risk of signal loss under deep fading, which directly leads to a significant decrease in navigation availability.
Andrew K. Sun, Hyeyeon Chang, Sam Pullen, Hyosub Kil, Jiwon Seo, Y. Jade Morton, Jiyun Lee   +6 more
wiley   +1 more source

Grazed temporary grass‐clover leys in crop rotations can have a positive impact on soil quality under both conventional and organic agricultural systems

European Journal of Soil Science, Volume 72, Issue 4, Page 1513-1529, July 2021., 2021
Abstract Soil quality (SQ) is the ability of soil to provide ecosystem functions and services. Implementation of a certain agricultural system can affect SQ and therefore play an essential role in achieving sustainable agriculture. The aim of this study was to explore how agricultural systems (conventional vs.
Caio F. Zani, John Gowing, Geoffrey D. Abbott, James A. Taylor, Elisa Lopez‐Capel, Julia Cooper   +5 more
wiley   +1 more source

Safety arguments for next generation location aware computing [PDF]

, 2010
Concerns over the accuracy, availability, integrity and continuity of Global Navigation Satellite Systems (GNSS) have limited the integration of GPS and GLONASS for safety-critical applications.
C.M. Holloway, Holloway, C.M., C.W. Johnson, Johnson, Chris, Johnson, C.W.   +4 more
core   +1 more source

Ground‐Based GNSS and C/NOFS Observations of Ionospheric Irregularities Over Africa: A Case Study of the 2013 St. Patrick’s Day Geomagnetic Storm

Space Weather, Volume 19, Issue 2, February 2020., 2021
Abstract In this paper, the variations of ionospheric irregularities have been studied using C/NOFS, ground‐based GNSS and magnetometer measurements in Africa during the St. Patrick geomagnetic storm of March 17, 2013. The latitudinal distribution of irregularities was examined using GNSS‐ROTI maps covering longitude 25°–45°E.
P. O. Amaechi, E. O. Oyeyemi, A. O. Akala, H. E. Messanga, S. K. Panda, Gopi K. Seemala, J. O. Oyedokun, R. Fleury, C. Amory‐Mazaudier   +8 more
wiley   +1 more source

Electronic Guidance Cane for Users Having Partial Vision Loss Disability

Wireless Communications and Mobile Computing, Volume 2021, Issue 1, 2021., 2021
Vision is, no doubt, one of the most important and precious gifts to humans; however, there exists a fraction of visually impaired ones who cannot see properly. These visually impaired disabled people face many challenges in their lives—like performing routine activities, e.g., shopping and walking.
Asad Khan, Muhammad Awais Ashraf, Muhammad Awais Javeed, Muhammad Shahzad Sarfraz, Asad Ullah, Muhammad Mehran Arshad Khan, Mamoun Alazab   +6 more
wiley   +1 more source

Analysis of the accuracy of EGNOS+SDCM positioning in aerial navigation [PDF]

Archives of Transport, 2022
The article presents a modified scheme of determining the accuracy parameter of SBAS (Satellite Based Augmentation System) positioning with use of two supporting systems: EGNOS (European Geostationary Navigation Overlay Service) and SDCM (System of ...
Magda Mrozik, Jaroslaw Kozuba, Kamil Krasuski, Janusz Ćwiklak, Mieczysław Bakuła, Adam Ciećko, Grzegorz Grunwald, Damian Wierzbicki   +7 more
doaj   +1 more source