A5012009693- GNSS positioning and interference
- Ionosphere and magnetosphere dynamics
- Geophysics and Gravity Measurements
- Drilling and Well Engineering
- Indoor and Outdoor Localization Technologies
- Inertial Sensor and Navigation
- Geoscience and Mining Technology
- Thyroid Cancer Diagnosis and Treatment
- Radiomics and Machine Learning in Medical Imaging
- Tunneling and Rock Mechanics
- Hydraulic Fracturing and Reservoir Analysis
- Artificial Intelligence in Healthcare and Education
- Oil and Gas Production Techniques
- Earthquake Detection and Analysis
- Offshore Engineering and Technologies
- Mineral Processing and Grinding
- Enhanced Oil Recovery Techniques
- Hydrocarbon exploration and reservoir analysis
- Reservoir Engineering and Simulation Methods
- Robotics and Sensor-Based Localization
- Rock Mechanics and Modeling
- Gear and Bearing Dynamics Analysis
- Adhesion, Friction, and Surface Interactions
- Geomechanics and Mining Engineering
- Magnetic confinement fusion research
Shanghai Jiao Tong University
2020-2024
Xuzhou Medical College
2024
Affiliated Hospital of North Sichuan Medical College
2023
Beijing Tian Tan Hospital
2023
China University of Petroleum, East China
2021-2022
University of Calgary
2014-2019
Samsung (United States)
2019
China University of Petroleum, Beijing
2010-2014
Institute of Geodesy and Geophysics
2014
Chinese Academy of Sciences
2014
Light Detection and Ranging (LiDAR) based Simultaneous Localization Mapping (SLAM) has drawn increasing interests in autonomous driving. However, LiDAR-SLAM suffers from accumulating errors which can be significantly mitigated by Global Navigation Satellite System (GNSS). Precise Point Positioning (PPP), an accurate GNSS operation mode independent of base stations, gains growing popularity unmanned systems. Considering the features two technologies, PPP, this paper proposes a SLAM system,...
Precise Point Positioning (PPP), a cutting edge GNSS technology, can achieve high-precision positioning without base station assistance. Visual-Inertial Odometry (VIO) realizes more robust local pose estimation than Visual-SLAM. Based on PPP and VIO, we propose tightly-coupled PPP/INS/Visual SLAM system, P <inline-formula xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xlink="http://www.w3.org/1999/xlink"><tex-math notation="LaTeX">$^{3}$</tex-math></inline-formula> -VINS. It fuses raw...
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...
Mapping function (MF) converts the line-of-sight slant total electron content (STEC) into vertical (VTEC), and vice versa. In an MF, essential parameter is ionospheric effective height. However, inhomogeneous ionosphere makes this height vary spatially temporally, meaning it not a global constant. paper, we review several mapping functions propose that utilizes varying (IVH). We investigate impacts of IVH on errors modeling, as well satellite receiver differential code biases (DCBs). Our...
Differential Code Biases (DCBs) are much more relevant when GNSS data processing with code measurements is involved, such as in ionospheric sensing, positioning, and timing. The current approach to estimate DCBs based on carrier-phase smoothed observations together modeling. A limiting factor of the method effect leveling errors from smoothing process DCB estimate. To reduce errors, a new estimation an Uncombined Precise Point Positioning (UPPP) model proposed. month's global network high...
P3-LINS, a navigation system tightly coupling precise point positioning (PPP)-global satellite (GNSS)/inertial (INS)/light detection and ranging (LiDAR) with the DRANSAC-receiver autonomous integrity monitoring (RAIM) doppler iterative closet algorithm (DICP) as its initialization procedure is established for accurate reliable in urban environments. The position of P3-LINS completed by static PPP DRANSAC-RAIM algorithm. yaw initialized through proposed DICP which relies on quadratic...
To build a combined model based on the ultrasound radiomic and morphological features, evaluate its diagnostic performance for preoperative prediction of central lymph node metastasis (CLNM) in patients with papillary thyroid carcinoma (PTC).A total 295 eligible patients, who underwent scan were pathologically diagnosed unifocal PTC included at our hospital from October 2019 to July 2022. According scanners, divided into training set (115 CLNM; 97 without CLNM) validation (45 38 CLNM)....
The BeiDou Navigation Satellite System (BDS) has developed rapidly, and the combination of BDS Phase II (BDS-2) III (BDS-3) attracted wide attention. It is found that there are code ISBs between BDS-2 BDS-3, which may have a certain impact on BDS-3 combined positioning. This paper focuses performance BDS-2/BDS-3 B1I single-frequency pseudorange positioning investigates with without correction for different types receivers, include geodetic GNSS receivers low-cost receivers. results show...
Profile control is utilized to redirect the injection water low permeability region where a large amount of crude oil lies. Performed gel particles are commonly used agent for redistributing by blocking pores in high region. But capability deep penetration performed poor. Here, we formulate nanoparticle stabilized emulsion (NSE). The stability and effect NSE on fluid redirection three-dimensional porous medium were investigated. By using μ-PIV (particle image velocimetry), it was found that...
Precise point positioning–real-time kinematic (PPP-RTK) achieves fast convergence in global navigation satellite system (GNSS) positioning and navigation. Correcting slant ionospheric delays is crucial for this purpose. One way to obtain the corrections by interpolating from nearby reference stations. However, interpolation performance depends on many factors, such as time, elevation, distance. This article aims study of three algorithms, i.e., inverse-distance weighting (IDW), radial basis...
<h3>Abstract</h3> Ionospheric augmentation is one of the most important dependences PPP-RTK. Because dispersive features ionosphere, ionospheric information usually coupled with satellite- and receiver-related biases. This will pose a hidden trouble inconsistent corrections if different numbers reference stations are involved in calculation. In this paper, we aimed at introducing consistent regional vertical model (RVIM) by estimating receiver We first presented under sparse networks. Then...
The GNSS positioning performance can be significantly degraded in urban canyon environments due to the multipath effect. However, error cannot modeled or corrected accurately because it has no spatiotemporal correlation. Recently, machine learning models have shown ability learn potential relationships between data and are especially proficient fitting nonlinear functions. Based on this statement, many researches regard as most effective promising tools mitigate errors, among which popular...