Results 61 to 70 of about 424 (165)

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, Junzheng Wang, Hongbo Gao, Xiwen Luo, C. L. Philip Chen   +4 more
wiley   +1 more source

Direct Observational Evidence of the Mesoscale Gravity Wave Modulations on Low‐Latitude Sporadic E Layer

Geophysical Research Letters, Volume 53, Issue 2, 28 January 2026.
Abstract Sporadic E (Es) layer plays essential role in ionosphere‐atmosphere coupling. Theoretical simulations show that the atmospheric gravity waves (GWs) in the lower thermosphere are the main modulatory source on Es dynamics at small spatial scales and short periods.
Junyi Wang, Xinan Yue, Xu Zhou, Yihui Cai, Feng Ding, Jorge L. Chau, David C. Fritts, Juha Vierinen, Alan Z. Liu, Baiqi Ning   +9 more
wiley   +1 more source

Assessment of Commercial GNSS Radio Occultation Performance from PlanetiQ Mission

Remote Sensing
Global Navigation Satellite System (GNSS) radio occultation (RO) provides valuable 3-D atmospheric profiles with all-weather, all the time and high accuracy. However, GNSS RO mission data are still limited for global coverage.
Mohamed Zhran, Ashraf Mousa, Yu Wang, Fahdah Falah Ben Hasher, Shuanggen Jin   +4 more
doaj   +1 more source

GNSS-RO LEO satellite orbit optimization for Egypt and the Middle East region

Alexandria Engineering Journal, 2020
The “Radio Occultation (RO)” method is one from the simple, accurate and high resolution methods that produces a complete atmosphere model. Each region/country optimizes a “Low Earth Orbiter (LEO)” satellite orbit that covers its climate requirements by processing the “Global Navigation Satellite System (GNSS)” received signal.
Ibrahim Fouad Ghoniem, Ashraf El-Kutb Mousa, Gamal El-Fiky   +2 more
openaire   +2 more sources

Uncertainty Propagation From Radio Occultation Profiles to Aggregated Atmospheric Gridded Fields

Earth and Space Science, Volume 13, Issue 1, January 2026.
Abstract Radio occultation is a well‐established remote sensing method that provides reliable estimates of atmospheric profiles of diverse variables, including temperature and pressure. However, as with all indirect methods, radio occultation has some inherent systematic and random error effects, which lead to observational uncertainties.
S. Scher, F. Ladstädter, M. Schwärz, J. Innerkofler, G. Kirchengast   +4 more
wiley   +1 more source

GNSS Signal Jamming as Observed From Radio Occultation

IEEE Journal of Selected Topics in Applied Earth Observations and Remote Sensing
The jamming is found to increase significantly in recent years, and its impact is evident in Global Navigation Satellite System (GNSS) radio occultation (RO) measurements, such as those from COSMIC-2.
Dong L. Wu
doaj   +1 more source

Monitoring global climate change using GNSS radio occultation

npj Climate and Atmospheric Science, 2022
The emerging signal of climate change is now clearly evident in Global Navigation Satellite System (GNSS) radio occultation (RO) data, matching predictions made by climate models 15 years ago. The observed RO trends represent well-understood responses to
Hans Gleisner, Mark A. Ringer, Sean B. Healy   +2 more
doaj   +1 more source

Topside Ionization and Effect on Altitudinal Evolution of Nocturnal Ionospheric Irregularities

Space Weather, Volume 24, Issue 1, January 2026.
Abstract Topside ionospheric electron density (Ne) and its control on the variabilities in nocturnal ionospheric irregularities is examined globally using electron density measurements from COSMIC‐2 and Swarm satellite, along with the Swarm satellite‐based Ionospheric Plasma Irregularity (IPIR) index for low and high solar activity (LSA and HSA ...
T. V. Sruthi, G. Manju
wiley   +1 more source

First Observation of Localized F Region Bottom‐Type Scattering Layer by All‐Sky Radar at Low Latitude

Geophysical Research Letters, Volume 52, Issue 23, 16 December 2025.
Abstract F‐region bottom‐type scattering layers (BSLs) occurring over equatorial and low latitudes may act as the precursor of plasma bubbles, usually observed by narrow‐beam very high frequency radars. However, their spatial features remain unknown due to the radar narrow field‐of‐view.
Wenjie Sun, Guozhu Li, Lianhuan Hu, Biqiang Zhao, Jianfei Liu, Haiyong Xie, Guofeng Dai, Xiukuan Zhao, Yi Li, Baiqi Ning   +9 more
wiley   +1 more source

Local Time Variability of Gravity Wave Activity Revealed by SABER Temperature Observations

Geophysical Research Letters, Volume 52, Issue 23, 16 December 2025.
Abstract The global characteristics of gravity wave potential energy variation depending on local time are analyzed using satellite observations covering a broad range of local times. A clear diurnal variation is observed in the equatorial region between 15°S and 15°N.
D. Koshin, N. M. Pedatella, A. K. Smith, H.‐L. Liu   +3 more
wiley   +1 more source