Results 91 to 100 of about 187,706 (222)

Minimum-Entropy Autofocusing Based on Re-PSO for Ionospheric Scintillation Mitigation in P-Band SAR Imaging

IEEE Access, 2019
The spaceborne synthetic aperture radar (SAR) system working at P-band, is vulnerable to the ionospheric effect. The ionospheric scintillation will introduce random phase fluctuations into the SAR signal and deteriorate the imaging performance.
Lei Yu, Yongsheng Zhang, Qilei Zhang, Yifei Ji, Z. Dong   +4 more
semanticscholar   +1 more source

Ionosphere scintillation effects on navigation systems

Comptes Rendus. Physique, 2011
This article deals with the impact of ionospheric electron density inhomogeneities on the functionality of global navigation satellite systems emphasizing positioning errors. The scintillation characteristics of transmitted signals have been obtained using data gathered in measurement campaigns.
Beniguel, Y., Adam, Jean-Pierre, Bourdillon, Alain, Lassudrie-Duchesne, Patrick   +3 more
openaire   +3 more sources

Mitigation of Ionospheric Scintillation Effects on GNSS Signals with VMD-MFDFA

Remote Sensing, 2019
Severe scintillations degrade the satellite signal intensity below the fade margin of satellite receivers thereby resulting in failure of communication, positioning, and navigational services.
Wasiu Akande Ahmed, Falin Wu, Dessi Marlia, Ednofri, Yan Zhao   +4 more
semanticscholar   +1 more source

New Capabilities for Prediction of High‐Latitude Ionospheric Scintillation: A Novel Approach With Machine Learning

Space Weather, 2018
As societal dependence on transionospheric radio signals grows, space weather impact on these signals becomes increasingly important yet our understanding of the effects remains inadequate. This challenge is particularly acute at high latitudes where the
R. McGranaghan, R. McGranaghan, A. Mannucci, B. Wilson, C. Mattmann, Richard W. Chadwick   +5 more
semanticscholar   +1 more source

An Alternative Approach for Pseudorange Variance Estimation Under Scintillation Environments Using Markov‐Rao‐Blackwellized Particle Filtering

IET Radar, Sonar & Navigation
Ionospheric scintillations, arising from variations in phase/amplitude of radio signals traversing the ionosphere, pose significant challenges to Global Navigation Satellite System (GNSS) positioning, particularly in low‐latitude regions.
Paulo Silva, Marcelo G. S. Bruno, Victor di Santis, Alison Moraes, Jonas Sousasantos, Leonardo Marini‐Pereira   +5 more
doaj   +1 more source

Accuracy assessment of Precise Point Positioning with multi-constellation GNSS data under ionospheric scintillation effects

Journal of Space Weather and Space Climate, 2018
GPS and GLONASS are currently the Global Navigation Satellite Systems (GNSS) with full operational capacity. The integration of GPS, GLONASS and future GNSS constellations can provide better accuracy and more reliability in geodetic positioning, in ...
Marques Haroldo Antonio, Marques Heloísa Alves Silva, Aquino Marcio, Veettil Sreeja Vadakke, Monico João Francisco Galera   +4 more
doaj   +1 more source

ISNet: Decomposed Dynamic Spatio‐Temporal Neural Network for Ionospheric Scintillation Forecasts

Space Weather
Accurate prediction of ionospheric scintillation is essential for ensuring the reliability of spaceborne and ground‐based radio wave technology infrastructures, including but not limited to navigation and communication systems.
Zhixu Gao, Yanhong Chen, Xianzhi Ao, Fulu Yue, Hong Chen, Hao Deng, Bingxian Luo, Xin Wang, Tianjiao Yuan   +8 more
doaj   +1 more source

The statistical correlations of rate of change of TEC index (ROTI) on the standard scintillation indices over the Canadian Arctic

Frontiers in Astronomy and Space Sciences
For decades, the Rate of Change of Total Electron Content Index (ROTI) has been employed to monitor and quantify ionospheric irregularities, serving as a potential substitute for standard scintillation indices.
Yong Wang, P. T. Jayachandran, Fei-Fei Wang, Q.-H. Zhang, Shu-Ji Sun, Tong Xu, Zan-Yang Xing, Yu-Zhang Ma, J. M. Ruohoniemi, S. G. Shepherd   +9 more
doaj   +1 more source

Tackling ionospheric scintillation threat to GNSS in Latin America

Journal of Space Weather and Space Climate, 2011
Scintillations are rapid fluctuations in the phase and amplitude of transionospheric radio signals which are caused by small-scale plasma density irregularities in the ionosphere.
Monico Joao Francisco Galera, Bougard Bruno, Romano Vincenzo, Spogli Luca, Alfonsi Lucilla, De Franceschi Giorgiana, Hancock Craig, Elmas Zeynep, Forte Biagio, Aquino Marcio, Sreeja Vadakke Veettil, Wernik Andrzej W., Sleewaegen Jean-Marie, Cantó Andrea, Ferreira Da Silva Elcia   +14 more
doaj   +1 more source

Global Ionospheric Scintillation Estimation Based on Phase Screen Modeling From One‐Dimensional Satellite Data

Space Weather
Ionospheric scintillations, which usually manifest as sudden, rapid fluctuations in radio wave signal phase and amplitude, challenge the reliability of satellite communication and navigation.
Yuhao Zheng, Chao Xiong, Luca Spogli, Rayan Iman, Lucilla Alfonsi   +4 more
doaj   +1 more source