Results 101 to 110 of about 200,933 (218)

Quality Assessment of YUNYAO GNSS-RO Refractivity Data in the Neutral Atmosphere

Abstract. GNSS (Global Navigation Satellite System) Radio Occultation (RO) data is an important component of numerical weather prediction (NWP) systems. To incorporate more GNSS RO data into NWP systems, commercial RO data has become an excellent option. Tianjin Yunyao Aerospace Technology Co., Ltd.
Xiaoze Xu, Wei Han, Jincheng Wang, Zhiqiu Gao, Fenghui Li, Yan Cheng, Naifeng Fu   +6 more
openaire   +2 more sources

Modeling the GNSS Rural Radio Channel: Wave Propagation Effects caused by Trees and Alleys [PDF]

, 2009
Among the various physical influencing factors with the potential to degrade the overall performance of a global navigation satellite system (GNSS), the behavior of the radio wave propagation channel occupies doubtlessly a central role.
Lehner, A., Schubert, F.M., Robertson, P., Fleury, B.H., Steingass, Alexander   +4 more
core  

Analyzing precipitable water vapor with GNSS radio occultation wet profiles, radiosonde observations and ECMWF ERA5 reanalysis data over the Türkiye region

: The Global Navigation Satellite System (GNSS)-Radio Occultation (RO) is a satellite-based technique providingsignificant advantages for improving weather forecastsand investigating climatic variations.
Tanır Kayıkçı, Emine, Çelik Tunçer, Seldanur   +1 more
core   +1 more source

Assessing the Performance of GNSS Signal Acquisition: New Signals and GPS L1 C/A Code

, 2014
International audienceThe low power and spread spectrum nature of GNSS signals make their detection and acquisition a key, but challenging aspect of receiver processing designs.
Hein, Günter, Julien, Olivier, Bacard, Fayaz, Foucras, Myriam, Macabiau, Christophe, Ekambi, Bertrand   +5 more
core   +1 more source

Ionospheric scintillation anomalies from COSMIC-2 GNSS-RO from 2019 and 2024 as potential earthquake precursors

Currently, there are no consistent earthquake precursors for early warning. However, the correlation between earthquakes and ionospheric scintillation, measured using the S4 index via GNSS-RO, is under active study. This research analyzes S4 anomalies as
Camps Carmona, Adriano José, Molina Ordóñez, Carlos, Hyuk, Park, Boudriki Semlali, Badr Eddine, Badr-Eddine Boudriki Semlali, Hyuk Park, Adriano Camps, Camps, Adriano, Park, Hyuk, Carlos Molina, Boudriki Semlali, Badr-Eddine, Molina, Carlos   +11 more
core   +1 more source

One‐Dimensional Variational Ionospheric Retrieval Using Radio Occultation Bending Angles: 1. Theory

Space Weather
A new one‐dimensional variational (1D‐Var) retrieval method for ionospheric GNSS radio occultation (GNSS‐RO) measurements is described. The forward model implicit in the retrieval calculates the bending angles produced by a one‐dimensional ionospheric ...
I. D. Culverwell, S. B. Healy, S. Elvidge   +2 more
doaj   +1 more source

Impact of YunYao GNSS-RO Refractivity Data Assimilation on Typhoon Forecasts: A Case Study of Typhoon BEBINCA (2024)

Atmosphere
The accuracy of numerical weather prediction largely depends on the quality of the initial conditions. Global Navigation Satellite System radio occultation (GNSS-RO) observations, with their high vertical resolution, play an important role in reducing ...
Liang Kan, Fenghui Li, Jinxiao Li, Manyi Huang, Pengcheng Wang, Yan Cheng, Jiawen Cui, Dan Yan, Wenxi Zhang, Chaochao He, Xuewei Liang, Zili Shen, Wen Zhou   +12 more
doaj   +1 more source

Tropospheric Information Content Embedded in GNSS RO Reflected Signals

, 2011
Peer ...
Cardellach, Estel, Oliveras, Santiago, Rius, Antonio   +2 more
openaire   +1 more source

Estimativa e análise de perfis de densidade de elétrons para a região brasileira: integração de informações provenientes de rádio ocultação e de estações terrestres GNSS

Revista Cartográfica
A rádio ocultação (RO) é utilizada há mais de seis décadas para a sondagem da atmosfera de outros planetas. O advento dos Sistemas Globais de Navegação por Satélite (GNSS) e das missões com satélites de baixa órbita, permitiram novas possibilidades de ...
Gabriel Oliveira Jerez, Daniele Barroca Marra Alves, Manuel Hernández-Pajares, João Francisco Galera Monico   +3 more
doaj   +1 more source

On Backward Compatibility in GNSS Signal Design [PDF]

, 2011
This work further develops tools and methodologies for systematic GNSS signal design. Inter and intra system multiple access interference (MAI), synchronization accuracy, time-delay estimation robustness, and backward compatibility with respect to ...
Antreich, Felix, Issler, Jean-Luc, Nossek, Josef A., Floch, Jean-Jacques   +3 more
core