Results 101 to 110 of about 7,524 (217)
IMPACT OF IONOSPHERIC HORIZONTAL ASYMMETRY ON ELECTRON DENSITY PROFILES DERIVED BY GNSS RADIO OCCULTATION [PDF]
, 2013 The ‘Onion-peeling' algorithm is a very common technique used to invert Radio Occultation (RO) data in the ionosphere. Because of the implicit assumption of spherical symmetry for the electron density distribution in the ionosphere, the standard Onion ...
Dovis, Fabio +3 more
core
The GNSS-R Eddy Experiment II: L-band and Optical Speculometry for Directional Sea-Roughness Retrieval from Low Altitude Aircraft [PDF]
, 2003 We report on the retrieval of directional sea-roughness (the full directional mean square slope, including MSS, direction and isotropy) through inversion of Global Navigation Satellite System Reflections (GNSS-R) and SOlar REflectance Speculometry (SORES)
B. Chapron +20 more
core +6 more sources
Space Weather, Volume 24, Issue 3, March 2026.Abstract The sporadic E (Es) layer, a key manifestation of ionosphere‐neutral atmosphere coupling, is highly sensitive to geomagnetic storms. Using more than 25,000 daily radio occultation profiles from the Tianmu‐1 and COSMIC‐2 constellations, this study investigates the global response of the Es layer to the May 2024 storm.
Sheng Guo +4 more
wiley +1 more source
Space Weather, Volume 24, Issue 2, February 2026.Abstract This study presents a comprehensive evaluation of COSMIC‐2 satellite‐derived ionospheric peak parameters (foF2 and hmF2) against ground‐based ionosonde observations and a comparative analysis with PyIRI (2020) model estimates across middle to low latitudes for the period 2020–2024.
Ephrem Beshir Seba +3 more
wiley +1 more source
Applying Hpo Indices to Empirical Thermospheric Density Models During Geomagnetic Storms
Earth and Space Science, Volume 13, Issue 2, February 2026.Abstract Accurate atmospheric drag modeling is essential for precise orbit determination and prediction of Low Earth Orbit satellites. A key component is the thermospheric density, typically estimated using empirical models driven by geomagnetic activity indices such as the 3‐hr Kp or ap.
Kemin Zhu +5 more
wiley +1 more source
Symmetrical clock synchronization with time-correlated photon pairs
, 2018 We demonstrate a point-to-point clock synchronization protocol based on bidirectionally exchanging photons produced in spontaneous parametric down conversion (SPDC).
Cerè, Alessandro +5 more
core +1 more source
AI‐Based Improvement of IRI‐2020 Electron Density Profiles With COSMIC Radio Occultation Data
Space Weather, Volume 24, Issue 2, February 2026.Abstract In this study, we propose an AI‐based method to improve the electron density profiles generated by the International Reference Ionosphere (IRI)‐2020 model using the Constellation Observing System for Meteorology, Ionosphere, and Climate (COSMIC) radio occultation (RO) data.
Eun‐Young Ji +5 more
wiley +1 more source
An Autonomous Reference Frame for Relativistic GNSS
, 2013 Current GNSS systems rely on global reference frames which are fixed to the Earth (via the ground stations) so their precision and stability in time are limited by our knowledge of the Earth dynamics.
Carloni, Sante +4 more
core
Dynamic Neural‐Model‐Based Predictive Control for Autonomous Wheel‐Legged Robot System
CAAI Transactions on Intelligence Technology, Volume 11, Issue 1, Page 83-97, February 2026.ABSTRACT Mobile wheel‐legged robots exhibiting mobility, stability and reliability have garnered heightened research attention in demanding real‐world scenarios, especially in material transport, emergency response and space exploration. The kinematics model merely delineates the geometric relationship of the controlled objective, disregarding force ...
Jiehao Li +4 more
wiley +1 more source
Benchmarking Particle Filter Algorithms for Efficient Velodyne-Based Vehicle Localization [PDF]
, 2019 Keeping a vehicle well-localized within a prebuilt-map is at the core of any autonomous vehicle navigation system. In this work, we show that both standard SIR sampling and rejection-based optimal sampling are suitable for efficient (10 to 20 ms) real ...
Blanco Claraco, José Luis +4 more
core +3 more sources