A5101936612- GNSS positioning and interference
- Geophysics and Gravity Measurements
- Ionosphere and magnetosphere dynamics
- Inertial Sensor and Navigation
- Remote Sensing and Land Use
- Advanced Frequency and Time Standards
- Advanced Computational Techniques and Applications
- Microstructure and Mechanical Properties of Steels
- Mechanical Failure Analysis and Simulation
- Metallurgy and Material Forming
- Hydrogen embrittlement and corrosion behaviors in metals
- Metal Alloys Wear and Properties
- Fatigue and fracture mechanics
- Cellular and Composite Structures
- Advanced Chemical Physics Studies
- Mechanical stress and fatigue analysis
- Scientific Measurement and Uncertainty Evaluation
- Acoustic Wave Phenomena Research
- Advanced Measurement and Detection Methods
- Analytical Chemistry and Chromatography
- Analytical chemistry methods development
- Atmospheric chemistry and aerosols
- Spectroscopy and Laser Applications
- Atmospheric Ozone and Climate
- Welding Techniques and Residual Stresses
Wuhan University
2014-2024
Institute of Electrical and Electronics Engineers
2013-2024
Nantong University
2024
Antea Group (France)
2024
Frontier Science Foundation-Hellas
2024
Long Island University
2024
Alpha Omega Electromagnetics (United States)
2024
Atlantic Industries (Canada)
2024
Cedar Rapids Public Library
2024
Chapter Arts Centre
2024
The IGS real-time service (RTS) enables precise point positioning (PPP) at a global scale. A long convergence time however is still challenging factor. In order to reduce the time, external troposphere corrections could be introduced remove effects on coordinate solution. This paper proposes use of local model augment PPP. First, undifferenced observations from network multiple stations are processed estimate station-based zenith wet delay (ZWD). set fitting coefficients then derived using...
Abstract Tropospheric correction models are receiving increasing attentions, as they play a crucial role in Global Navigation Satellite System (GNSS). Most commonly used to date include the GPT2 series and TropGrid2. In this study, we analyzed advantages disadvantages of existing developed new model called Improved Grid (ITG). ITG considers annual, semi-annual diurnal variations includes multiple tropospheric parameters. The amplitude initial phase variation estimated periodic function....
Nowadays, a huge amount of GNSS continuously operating reference stations (CORS) have been established around the world, which already and will continue providing massive troposphere zenith total delay (ZTD) data. This paper proposes an efficient deep learning-based ZTD dataset generation method including series segmentation, addictive innovational outlier detection, missing data imputation. The overall standard deviation first-order difference between adjacent epochs selected CORS station...
Failure analysis was carried out on a tube-to-tubesheet welded joint of shell-tube heat exchanger to confirm its failure mechanism. The collected evidence suggests that the induced by fatigue. Under morphology analysis, fracture surface exhibit obvious fatigue crack propagation traces. Fatigue striations were observed clearly in zone. Detecting results showed chemical composition and mechanical properties tubes consistent with standard requirements for 304 stainless steel. metallographic...
Large language models (LLMs), both proprietary and open-source, have demonstrated remarkable capabilities across various natural processing tasks. However, they face significant limitations in legal reasoning Proprietary introduce data privacy risks high inference costs, while open-source underperform due to insufficient domain training data. To address these limitations, we study generation for improve the performance of LLMs with help LLMs. This is challenging lack knowledge difficulty...
The functional model of Global Positioning System (GPS) troposphere tomography consists three types equations including the observation equation, horizontal constraint and vertical equation. prerequisite for ensuring accuracy modeling is to determine optimal weights equations. In order reasonably among these equations, this paper proposes an weighting method. Compared conventional equal scheme constant scheme, method proposed in can adaptively adjust various enable posterior unit weight...
The ionosphere is one of the major error sources in Global Navigation Satellite System (GNSS) positioning, navigation and timing. Estimating ionospheric delays precisely great interest GNSS community. To date, observables for estimation are most commonly based on carrier phase smoothed code measurements. However, leveling errors, which affect performance modeling differential bias (DCB) estimation, exist observations. Such errors caused by multipath short-term variation DCB. reduce these...
Zenith tropospheric delay (ZTD) plays an important role in high-precision global navigation satellite system (GNSS) positioning and meteorology. At present, commonly used ZTD forecasting models comprise empirical, meteorological parameter, neural network models. The empirical model can only fit approximate periodic variations, its accuracy is relatively low. of the parameter depends heavily on parameters. recurrent (RNN) suitable for short-term series data prediction, but long-term series,...
Water vapor is an important driving factor in the related weather processes troposphere, and its temporal-spatial distribution change are crucial to formation of cloud rainfall. Global Navigation Satellite System (GNSS) water tomography, which can reconstruct using GNSS observation data, plays increasingly role meteorology. In this paper, a method improve observations tomography proposed overcome problem relatively concentrated observations, enable satellite signal rays penetrate more...
The second-generation of the Beidou Navigation Satellite System (BDS-2) has been officially providing positioning, navigation, and timing (PNT) services within Asia-Pacific region for six years, starting from 2013. A comprehensive analysis BDS-2 satellite broadcast navigation message performance during past years is highly demanded, not only regional service but also global announced in December 2018. Therefore, this study focuses on assessment six-year messages 2013 to 2018 three aspects:...
The accuracy of global tropospheric empirical models depends on the model expression and modeling data sources. Although current temporal resolution available is usually one day, it anticipated that this will be improved in future. To achieve compatibility with future high temporal-resolution sources, study develops a new correction model, Wuhan-University Global Tropospheric Empirical Model (WGTEM). Evaluation WGTEM determines has better precision than other models, attributed to its...