Results 21 to 30 of about 447 (167)

GNSS Radio Occultation in Advanced Numerical Weather Prediction Models

GEOmedia, 2019
GPS-Radio Occultation (GPS-RO), and generally, Global Navigation Satellite System Radio Occultation (GNSS-RO), is a technique that measures the refractivity of the Earth's atmosphere as a Low Earth Orbit (LEO) satellite listens to the radio signal of a ...
Guillermo Bosch
doaj   +3 more sources

Retrieval of the Stratospheric Density by the Star Occultation

Aerospace, 2023
The navigation by the stellar refraction is important for a LEO (Low-Earth-Orbit) satellite, especially in a GNSS (Global Navigation Satellite System)-denied environment, since it is totally autonomous.
Kedong Wang, Zhennan Li, Shaoxiong Zhang
doaj   +1 more source

An introduction to the FY3 GNOS instrument and mountain-top tests [PDF]

Atmospheric Measurement Techniques, 2014
The FY3 (Feng-Yun-3) GNOS (GNSS Occultation Sounder) mission is a GNSS (Global Navigation Satellite System) radio occultation mission of China for remote sensing of Earth's neutral atmosphere and the ionosphere.
W. H. Bai, Y. Q. Sun, Q. F. Du, G. L. Yang, Z. D. Yang, P. Zhang, Y. M. Bi, X. Y. Wang, C. Cheng, Y. Han   +9 more
doaj   +1 more source

Analysis of the differences between GPS radio occultation and radiosonde atmosphere profiles in Egypt

Egyptian Journal of Remote Sensing and Space Sciences, 2022
Difference values between Global Positioning System (GPS)-Radio Occultation (RO) and radiosonde (RS) profiles are analyzed to assess the integration applicability between them in Egypt.
Ibrahim Fouad Ahmed, Mohamed Amin Abd El-Fatah, Ashraf El-Kutb Mousa, Gamal El-Fiky   +3 more
doaj   +1 more source

A comparison of FORMOSAT-3/COSMIC radio occultation and ionosonde measurements in sporadic E detection over mid- and low-latitude regions

Frontiers in Astronomy and Space Sciences, 2023
The investigation of sporadic E or Es layers typically relies on ground-based or satellite data. This study compares the Es layers recorded in ionograms with those detected using GNSS L1 signal-to-noise ratio data from FORMOSAT-3/COSMIC radio occultation
S. Sobhkhiz-Miandehi, S. Sobhkhiz-Miandehi, Y. Yamazaki, C. Arras, C. Arras, D. Themens, D. Themens   +6 more
doaj   +1 more source

Polarimetric GNSS Radio-Occultations for heavy rain detection [PDF]

2010 IEEE International Geoscience and Remote Sensing Symposium, 2010
A Global Navigation Satellite System (GNSS) Radio-Occultation (RO) experiment is being accommodated in the Spanish Low Earth Orbiter (LEO) for Earth Observation PAZ. The RO-payload will provide globally distributed vertical thermodynamic profiles of the Atmosphere in Near Real-Time (NRT) suitable to be assimilated into Weather Numerical Prediction ...
Estel Cardellach, Antonio Rius, Fernando Cerezo, Miguel Angel Garcia-Primo, Manuel de la Torre Juárez, Lidia Cucurull, Dave Ector   +6 more
openaire   +2 more sources

Automatic GNSS Ionospheric Scintillation Detection with Radio Occultation Data Using Machine Learning Algorithm

Applied Sciences, 2023
Ionospheric scintillation often occurs in the polar and equator regions, and it can affect the signals of the Global Navigation Satellite System (GNSS).
Guangwang Ji, Ruimin Jin, Weimin Zhen, Huiyun Yang   +3 more
doaj   +1 more source

Simultaneous Radio Occultation Predictions for Inter-Satellite Comparison of Bending Angle Profiles from COSMIC-2 and GeoOptics

Remote Sensing, 2021
The Global Navigation Satellite System (GNSS) radio occultation (RO) is a remote sensing technique that uses International System of Units (SI) traceable GNSS signals for atmospheric limb soundings.
Yong Chen, Xi Shao, Changyong Cao, Shu-peng Ho   +3 more
doaj   +1 more source

Evaluation of Forward Models for GNSS Radio Occultation Data Processing and Assimilation [PDF]

Remote Sensing, 2022
In radio occultation (RO) data processing and data assimilation, the forward model (FM) is used to calculate bending angle (BA) from refractivity (N). The accuracy and precision of forward modeled BA are affected by refractivity profiles and FM methods, including Abel integral algorithms (direct, exp, exp_T, linear) and methods of interpolating ...
Nan Deng, Weihua Bai, Yueqiang Sun, Qifei Du, Junming Xia, Xianyi Wang, Congliang Liu, Yuerong Cai, Xiangguang Meng, Cong Yin, Feixiong Huang, Peng Hu, Guangyuan Tan, Xiaoxu Liu   +13 more
openaire   +2 more sources

Processing multiple GNSS RO data using FSI and ROPP: results from the ROMEX [PDF]

Atmospheric Measurement Techniques
Global Navigation Satellite System (GNSS) Radio Occultation (RO) is a vital technique in atmospheric remote sensing, providing all-weather, high-resolution vertical observations that support numerical weather prediction (NWP) and atmospheric research. To
Y. Chen, X. Zhou, X. Jing, S.-P. Ho, X. Shao, T.-C. Liu   +5 more
doaj   +1 more source