Results 31 to 40 of about 847,572 (191)

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

A nonlinear optimal, estimation inverse method for radio occultation measurements of temperature, humidity, and surface pressure [PDF]

, 2000
An optimal estimation inverse method is presented which can be used to retrieve simultaneously vertical profiles of temperature and specific humidity, in addition to surface pressure, from satellite-to-satellite radio occultation observations of the ...
J. R. Eyre, S. B. Healy, J. J. Barnett, Palmer, P. I., Healy, S. B., Eyre, J. R., Barnett, J. J., Paul I. Palmer   +7 more
core   +1 more source

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

GNSS Radio Occultation for Ionosphere Remote Sensing

The radio occultation (RO) measurements of the Global Navigation Satellite System’s (GNSS’s) signals onboard a Low Earth Orbiting (LEO) satellite enable the computation of the vertical elec-tron density profile from the LEO satellite’s orbit height down ...
Hoque, Mohammed Mainul
openaire   +2 more sources

Application of an optimal estimation inverse method to GPS/MET bending angle observations [PDF]

, 2001
Palmer et al. [2000] describes an optimal estimation inverse method for radio occultation (RO) bending angle measurements to retrieve simultaneously temperature, humidity, and surface pressure; outlines quality control procedures for retrieved profiles ...
Palmer, P. I., Barnett, J. J.
core   +1 more source

Analysis of reflections in GNSS radio occultation measurements using the phase matching amplitude [PDF]

Atmospheric Measurement Techniques, 2018
It is well-known that in the presence of super-refractive layers in the lower-tropospheric inversion of GNSS radio occultation (RO) measurements using the Abel transform yields biased refractivity profiles. As such it is problematic to reconstruct the
T. Sievert, J. Rasch, A. Carlström, M. I. Pettersson   +3 more
doaj   +1 more source