Congliang Liu
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View article: Topside Total Electron Content Retrieval and Validation Using FY-3 G GNOS-II Observations
Topside Total Electron Content Retrieval and Validation Using FY-3 G GNOS-II Observations Open
The Fengyun-3 G (FY-3 G) satellite equipped with a Global Navigation Occultation Sounder II (GNOS-II) is capable of tracking BeiDou Navigation Satellite System (BDS) and Global Positioning System (GPS) dual-frequency signals by its zenith …
View article: Assessment of FY-3E GNOS II Radio Occultation Data Using an Improved Three-Cornered Hat Method
Assessment of FY-3E GNOS II Radio Occultation Data Using an Improved Three-Cornered Hat Method Open
The spatial–temporal sampling errors arising from the differences in geographical locations and measurement times between co-located Global Navigation Satellite System (GNSS) radio occultation (RO) and radiosonde (RS) data represent system…
View article: Evaluation of excess phase and bending angle data from FengYun-3 radio occultation based on two independent processing chains
Evaluation of excess phase and bending angle data from FengYun-3 radio occultation based on two independent processing chains Open
With long-term mission planning extending well into the next decade, the Chinese FengYun-3 (FY-3) meteorological satellite series acts as an important backbone for the provision of radio occultation (RO) data for climate science and numeri…
View article: Understanding Ionospheric and Geomagnetic Effects on Residual Biases in Radio Occultation Data for Stratospheric Climate Monitoring
Understanding Ionospheric and Geomagnetic Effects on Residual Biases in Radio Occultation Data for Stratospheric Climate Monitoring Open
Higher‐order residual ionospheric errors in Global Navigation Satellite System (GNSS) radio occultation (RO) data can induce a systematic residual ionospheric bias (RIB) in RO bending angles, which can impact stratospheric climate monitori…
View article: A Novel Approach to Evaluate GNSS-RO Signal Receiver Performance in Terms of Ground-Based Atmospheric Occultation Simulation System
A Novel Approach to Evaluate GNSS-RO Signal Receiver Performance in Terms of Ground-Based Atmospheric Occultation Simulation System Open
The global navigation satellite system radio occultation (GNSS-RO) is an important means of space-based meteorological observation. It is necessary to test the Global Navigation Satellite System Occultation signal receiver on the ground be…
View article: GNOS-II on Fengyun-3 Satellite Series: Exploration of Multi-GNSS Reflection Signals for Operational Applications
GNOS-II on Fengyun-3 Satellite Series: Exploration of Multi-GNSS Reflection Signals for Operational Applications Open
The Global Navigation Satellite System Occultation Sounder II (GNOS-II) payload onboard the Chinese Fengyun-3E (FY-3E) satellite is the world’s first operational spaceborne mission that can utilize reflected signals from multiple navigatio…
View article: Preliminary Assessment of BDS Radio Occultation Retrieval Quality and Coverage Using FY-3E GNOS II Measurements
Preliminary Assessment of BDS Radio Occultation Retrieval Quality and Coverage Using FY-3E GNOS II Measurements Open
The FengYun-3E Global Navigation Satellite System (GNSS) occultation sounder II (FY-3E GNOS II) was launched on 5 July 2021. For the first time, based on the new GNOS II sensor, this mission realizes radio occultation (RO) and reflectometr…
View article: Effect of Multiple GNSS Integration on the Number and Spatiotemporal Coverage of Radio Occultation Events
Effect of Multiple GNSS Integration on the Number and Spatiotemporal Coverage of Radio Occultation Events Open
The development of global navigation satellite systems (GNSSs) and multi-system compatible radio occultation (RO) techniques provides favorable conditions and opportunities for increasing the number of occultation events and improving thei…
View article: Evaluation of Forward Models for GNSS Radio Occultation Data Processing and Assimilation
Evaluation of Forward Models for GNSS Radio Occultation Data Processing and Assimilation Open
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 a…
View article: FY3E GNOS II GNSS Reflectometry: Mission Review and First Results
FY3E GNOS II GNSS Reflectometry: Mission Review and First Results Open
FengYun-3E (FY3E), launched on 5 July 2021, is one of China’s polar-orbiting meteorological satellite series. The GNOS II onboard FY3E is an operational GNSS remote sensor that for the first time combines GNSS radio occultation (GNSS RO) a…
View article: A Machine Learning-Based Method for Wind Fields Forecasting Utilizing GNSS Radio Occultation Data
A Machine Learning-Based Method for Wind Fields Forecasting Utilizing GNSS Radio Occultation Data Open
With the development of computer technology and expanding environmental issues, machine learning has received more and more attention in the field of weather forecasting. Global Navigation Satellite System-Radio Occultation(GNSS-RO) techno…
View article: The Accuracy Assessment and Scientific Research Progress of Ionospheric Radio Occultation Products Observed by Fengyun-3 GNOS
The Accuracy Assessment and Scientific Research Progress of Ionospheric Radio Occultation Products Observed by Fengyun-3 GNOS Open
Global navigation satellite system (GNSS) radio occultation (RO) is a novel detection technique that can provide global ionospheric products with high vertical resolution, high precision, and low cost. In recent years, China has launched t…
View article: Preliminary Accuracy Assessment of the F-Layer Worst-Case BDS Scintillation Observed by the GNOS Onboard the FY3D Satellite
Preliminary Accuracy Assessment of the F-Layer Worst-Case BDS Scintillation Observed by the GNOS Onboard the FY3D Satellite Open
The FY3C/GNOS launched in 2013 can only detect the scintillation of GPS navigation signals, while the FY3D satellite launched in 2017 supports the scintillation observation of BeiDou navigation satellite system (BDS) signals, thus enabling…
View article: Impacts of Orbital and Constellation Parameters on the Number and Spatiotemporal Coverage of LEO-LEO Occultation Events
Impacts of Orbital and Constellation Parameters on the Number and Spatiotemporal Coverage of LEO-LEO Occultation Events Open
The development of small-satellite technologies allows the low Earth orbit intersatellite link (LEO-LEO) occultation method to observe the Earth’s atmosphere with global coverage and acceptable costs using electromagnetic signals, in which…
View article: FA-RDN: A Hybrid Neural Network on GNSS-R Sea Surface Wind Speed Retrieval
FA-RDN: A Hybrid Neural Network on GNSS-R Sea Surface Wind Speed Retrieval Open
Based on deep learning, this paper proposes a new hybrid neural network model, a recurrent deep neural network using a feature attention mechanism (FA-RDN) for GNSS-R global sea surface wind speed retrieval. FA-RDN can process data from th…
View article: Global Comparison of F2-Layer Peak Parameters Estimated by IRI-2016 With Ionospheric Radio Occultation Data During Solar Minimum
Global Comparison of F2-Layer Peak Parameters Estimated by IRI-2016 With Ionospheric Radio Occultation Data During Solar Minimum Open
The F2-layer peak parameters of the International Reference Ionosphere (IRI) model are critical to its subsequent applications because of the vital role of the peak parameters in determining other IRI model outputs. Therefore, we analyzed …
View article: Applications of GNSS-RO to Numerical Weather Prediction and Tropical Cyclone Forecast
Applications of GNSS-RO to Numerical Weather Prediction and Tropical Cyclone Forecast Open
The global navigation satellite system (GNSS) radio occultation (RO) technique is an atmospheric sounding technique that originated in the 1990s. The data provided by this approach are playing a consistently significant role in atmospheric…
View article: New Higher-Order Correction of GNSS RO Bending Angles Accounting for Ionospheric Asymmetry: Evaluation of Performance and Added Value
New Higher-Order Correction of GNSS RO Bending Angles Accounting for Ionospheric Asymmetry: Evaluation of Performance and Added Value Open
The residual ionospheric error (RIE) from higher-order terms in the refractive index is not negligible when using global navigation satellite system (GNSS) radio occultation (RO) data for climate and meteorology applications in the stratos…
View article: An Evaluation of Fengyun-3C Radio Occultation Atmospheric Profiles Over 2015–2018
An Evaluation of Fengyun-3C Radio Occultation Atmospheric Profiles Over 2015–2018 Open
Fengyun-3C (FY-3C) is the first Chinese satellite that is capable of using the Radio Occultation (RO) technique to retrieve atmospheric profiles. This research evaluates the quality of FY-3C RO profiles including refractivity, temperature,…
View article: Comparison and Validation of the Ionospheric Climatological Morphology of FY3C/GNOS with COSMIC during the Recent Low Solar Activity Period
Comparison and Validation of the Ionospheric Climatological Morphology of FY3C/GNOS with COSMIC during the Recent Low Solar Activity Period Open
With the accumulation of the ionospheric radio occultation (IRO) data observed by Global Navigation Satellite System (GNSS) occultation sounder (GNOS) onboard FengYun-3C (FY3C) satellite, it is possible to use GNOS IRO data for ionospheric…
View article: Comparison of RO tropopause height based on different tropopause determination methods
Comparison of RO tropopause height based on different tropopause determination methods Open
Tropopause region is a significant layer among the earth's atmosphere, receiving increasing attention from atmosphere and climate researchers. To monitor global tropopause via radio occultation (RO) data, there are mainly two methods, one …
View article: Validation of Preliminary Results of Thermal Tropopause Derived from FY-3C GNOS Data
Validation of Preliminary Results of Thermal Tropopause Derived from FY-3C GNOS Data Open
The state-of-art global navigation satellite system (GNSS) occultation sounder (GNOS) onboard the FengYun 3 series C satellite (FY-3C) has been in operation for more than five years. The accumulation of FY-3C GNOS atmospheric data makes it…
View article: Application of the Fengyun 3 C GNSS occultation sounder for assessing the global ionospheric response to a magnetic storm event
Application of the Fengyun 3 C GNSS occultation sounder for assessing the global ionospheric response to a magnetic storm event Open
The rapid advancement of global navigation satellite system (GNSS) occultation technology in recent years has made it one of the most advanced space-based remote sensing technologies of the 21st century. GNSS radio occultation has many adv…
View article: The FengYun-3C radio occultation sounder GNOS: a review of the mission and its early results and science applications
The FengYun-3C radio occultation sounder GNOS: a review of the mission and its early results and science applications Open
The Global Navigation Satellite System (GNSS) Occultation Sounder (GNOS) is one of the new-generation payloads on board the Chinese FengYun 3 (FY-3) series of operational meteorological satellites for sounding the Earth's neutral atmospher…
View article: Analysis of ionospheric structure influences on residual ionospheric errors in GNSS radio occultation bending angles based on ray tracing simulations
Analysis of ionospheric structure influences on residual ionospheric errors in GNSS radio occultation bending angles based on ray tracing simulations Open
The Global Navigation Satellite System (GNSS) radio occultation (RO) technique is widely used to observe the atmosphere for applications such as numerical weather prediction and global climate monitoring. The ionosphere is a major error so…
View article: Evaluation of atmospheric profiles derived from single- and zero-difference excess phase processing of BeiDou radio occultation data from the FY-3C GNOS mission
Evaluation of atmospheric profiles derived from single- and zero-difference excess phase processing of BeiDou radio occultation data from the FY-3C GNOS mission Open
The Global Navigation Satellite System (GNSS) Occultation Sounder (GNOS) is one of the new-generation payloads onboard the Chinese FengYun 3 (FY-3) series of operational meteorological satellites for sounding the Earth's neutral atmosphere…
View article: The FengYun-3C radio occultation sounder GNOS: a review of the mission and its early results and science applications
The FengYun-3C radio occultation sounder GNOS: a review of the mission and its early results and science applications Open
The Global Navigation Satellite System (GNSS) occultation sounder (GNOS) is one of the new generation payloads onboard the Chinese FengYun 3 (FY-3) series of operational meteorological satellites for sounding the Earth’s neutral atmosphere…
View article: Response to Anonymous Referee #4's comments
Response to Anonymous Referee #4's comments Open
The paper describes the evaluation of zero-difference processing vs. single-difference processing of BeiDou System (BDS) radio occultation (RO) data collected by the Chinese GNOS instrument on board the FY-C3 satellite.Although this is not…