Results 111 to 120 of about 7,524 (217)

Ionospheric data fusion with GNSS, GNSS-RO and satellite altimetry based on machine learning

Global ionospheric maps (GIMs) are widely used ionospheric products, especially in Global Navigation Satellite System (GNSS) applications. They allow for instance to correct for the ionospheric delays in single-frequency applications. The input data for generating GIMs is typically obtained from dual-frequency observations at globally distributed GNSS ...
Marcel Iten, Shuyin Mao, Benedikt Soja
openaire   +2 more sources

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

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

An Investigation of GNSS Radio Occultation Data Pattern for Temperature Monitoring and Analysis over Africa

NDT - Journal of Non-Destructive Testing
Climate change monitoring and analysis is a critical task that involves the consideration of both spatial and temporal dimensions. Theimproved spatial distribution of the global navigation satellite system (GNSS) ground-based Continuous Operating ...
Usman Sa’i Ibrahim, Kamorudeen Aleem, Tajul Ariffin Musa, Terwase Tosin Youngu, Yusuf Yakubu Obadaki, Wan Anom Wan Aris, Kelvin Tang Kang Wee   +6 more
doaj   +1 more source

5G Cellular User Equipment: From Theory to Practical Hardware Design

, 2017
Research and development on the next generation wireless systems, namely 5G, has experienced explosive growth in recent years. In the physical layer (PHY), the massive multiple-input-multiple-output (MIMO) technique and the use of high GHz frequency ...
Dong, Xiaodai, Huo, Yiming, Xu, Wei
core   +1 more source

Panoramic Annular Localizer: Tackling the Variation Challenges of Outdoor Localization Using Panoramic Annular Images and Active Deep Descriptors

, 2019
Visual localization is an attractive problem that estimates the camera localization from database images based on the query image. It is a crucial task for various applications, such as autonomous vehicles, assistive navigation and augmented reality. The
Bai, Jian, Cheng, Ruiqi, Hu, Weijian, Huang, Xiao, Li, Huabing, Lin, Shufei, Sun, Dongming, Wang, Kaiwei, Yang, Kailun   +8 more
core   +1 more source

The impact of new signals on precise marine navigation - initial results from an experiment in Harwich Harbour [PDF]

, 2008
The General Lighthouse Authorities of the United Kingdom and Ireland (GLAs) are supporting a project at University College London (UCL) to study whether it is possible to meet the International Maritime Organisation’s (IMO) future requirements for port ...
Cross, PA, Grant, A, Parkins, AJ
core  

Tropospheric Information Content Embedded in GNSS RO Reflected Signals

, 2010
5 páginas. International Beacon Satellite Symposium (2010 : Barcelona, Espanya) This work presents the studies being conducted on the retrieval of tropospheric information from GNSS Radio-Occultation signals reflected off of the Earth’s surface.
Cardellach, Estel, Oliveras, Santiago, Rius, Antonio   +2 more
openaire   +1 more source

Polarimetric GNSS RO aboard the PAZ satellite

, 2020
Talk delivered in Informal Seminar UK MetOffice in Great Britain, 21 February 2020 ,
openaire   +1 more source

A new model for estimating atmospheric weighted mean temperature from radiosonde and multi-mission GNSS radio occultation data

Geodesy and Geodynamics
In Global Navigation Satellite System (GNSS) meteorology, the atmospheric weighted mean temperature (Tm) is a critical intermediate parameter for converting zenith wet delay (ZWD) to precipitable water vapor (PWV), essential for accurate atmospheric ...
Arash Tayfehrostami, Yazdan Amerian
doaj   +1 more source