A5100637375- Advanced Frequency and Time Standards
- GNSS positioning and interference
- Software-Defined Networks and 5G
- Particle physics theoretical and experimental studies
- Network Traffic and Congestion Control
- Ionosphere and magnetosphere dynamics
- Cloud Computing and Resource Management
- Earthquake Detection and Analysis
- Inertial Sensor and Navigation
- Dark Matter and Cosmic Phenomena
- Computational Physics and Python Applications
- Remote Sensing and Land Use
- Atomic and Subatomic Physics Research
- Green IT and Sustainability
- Wireless Networks and Protocols
- IoT and Edge/Fog Computing
- Educational Technology and Assessment
- Geochemistry and Geologic Mapping
- Video Surveillance and Tracking Methods
- Cold Atom Physics and Bose-Einstein Condensates
- Face and Expression Recognition
- Caching and Content Delivery
- Scientific Research and Discoveries
- Satellite Communication Systems
- Software System Performance and Reliability
Peng Cheng Laboratory
2021-2024
Chinese Academy of Sciences
2008-2024
Aerospace Information Research Institute
2021-2024
National Time Service Center
2008-2022
Southern University of Science and Technology
2021
Huawei Technologies (China)
2020
Shandong University
2020
Xi'an Institute of Optics and Precision Mechanics
2018
Hong Kong Polytechnic University
2015
Tianjin University
2012
Following the advancement and progression of urbanization, management problems wildland–urban interface (WUI) have become increasingly serious. WUI regional governance issues involve many factors including climate, humanities, etc., attracted attention research from all walks life. Building plays a vital part in area. location is closely related with planning area, number buildings to rescue arrangement. There are two major methods obtain this building information: one them relevant...
Abstract The radio wave used in communications at distance and navigation by satellite is affected ionosphere. Therefore study on the total electron content (TEC) ionosphere very important. There are some ionospheric prediction models, but accuracy of them 50%~60% only. A new model to predict proposed. given IGS each node grid fitted spherical‐harmonic expansion. coefficients different time form series, these series predicted ARMA ( p, q ) so that implemented. TEC data 2004 2005 analyzed our...
Geostationary Earth Orbit (GEO) satellites play a significant role in the space segment of Chinese Area Navigation System. The C-Band transfer ranging method developed by National Time Service Center (NTSC) has been widely used Positioning System (CAPS), with its advantages separating satellite from time synchronization and being unaffected weather. explicit correction models for are introduced detail this article first time. Precise Determination (POD) using pseudo-range observation GEO...
This study focuses on constructions that are vulnerable to fire hazards during wildfire events, and these known as ‘exposures’, which an increasingly significant area of disaster research. A key challenge lies in estimating dynamically comprehensively the risk individuals exposed spread. Here, ‘exposure risk’ denotes potential threat from fires within a future timeframe. paper introduces novel method integrates spatiotemporal knowledge graph with spread data exposure analysis model address...
Two-way satellite time and frequency transfer (TWSTFT) using satellites in inclined geo-synchronous orbit (IGSO) is fundamentally more difficult than geostationary (GEO), due to the fact that IGSO are constantly moving relative a ground station, which brings large residual effects. In this paper, we designed protocol an algorithm correct several factors affect precision of TWSTFT satellites. We used two stations, each equipped with sending receiving channels, conduct real-time measurements...
Network measurement provides operators an efficient tool for many network management tasks such as performance diagnosis, traffic engineering and intrusion prevention. However, with the rapid continuous growth of speed, it needs more computing memory resources to monitor in per-flow or per-packet granularity. Sample-based systems (e.g., NetFlow, sFlow) have been developed perform coarse-grained measurement, but they may miss part records, especially mice flows, which are important some...
Extended Reality (XR) has attracted great attention from both academic and industry, for providing users with an immersive experience anywhere. Nowadays, XR video streaming service is evolving to high definition (HD), which results in massive data traffic more stringent latency requirement. Due the two characteristics, it challenging support commercial use current New Ratio (NR) network. In this paper, we propose a real-time super-resolution (RTSR) framework HD transmission. The basic idea...
High-precision time synchronization between ground stations is essential for the precise measurement and determination of satellite orbits. Among numerous methods available, two-way frequency transfer (TWSTFT) technology widely used because approximate symmetry its signal transmission path, such that most error terms can be offset to obtain subnanosecond accuracy. A C-band comparison network has been constructed at National Time Service Center (NTSC), Chinese Academy Sciences orbit compare...
In GUT-scale constrained (GUTc) supersymmetric (SUSY) models, the mass of smuon $\tilde{\mu}_1$ is typically heavier than that stau $\tilde{\tau}_1$, and co-annihilation a typical annihilation mechanism dark matter. However, light more favored by muon $g-2$ anomaly, thus smuon-neutralino loop contribution to usually smaller sneutrino-chargino. Inspired latest results, we take GUTc- Next-to-Minimal Supersymmetric Model (NMSSM) as an example, where gaugino (Higgs) masses are not unified usual...
The correlation between Higgs-like scalars and light dark matter is an interesting topic, especially now that a $125 GeV$ Higgs was discovered (DM) searches got negative results. $95 excess reported by the CMS collaboration with $132 fb^{-1}$ data recently, DM search results XENONnT LZ collaborations motivate us to revise that. In this work, we study in GUT-scale constrained (GUTc) Next-to-Minimal Supersymmetric Model (NMSSM), where most parameters are input at GUT scale, but scalar gaugino...
The triangular closure (TC) method of two-way satellite time and frequency transfer (TWSTFT) can be utilized to conveniently quickly evaluate the performance between ground stations without additional equipment. To expand application TC make it applicable inclined geosynchronous orbit (IGSO) satellites, we analyze influence various residual effects TWSTFT on difference (TCD). Relying comparison network National Time Service Center Chinese Academy Sciences, experiments were carried out using...
To deal with the simultaneous jump of phase, frequency and amplitude in transient process signals improve accuracy zero-crossing detection, this paper proposes a fast detection algorithm for complex condition. The initially normalizes electrical quantity before it passes through narrow-band filter. Then is used to calculate time eliminate zero offset jitter. Finally, phase information positive negative crossing points obtained. Simulation results show that improves tracking based on higher...
Embedded devices, such as home routers or single-board computers, are becoming more powerful and affordable. Many of the existing Linux-based network measurement tools can also be run on these devices through cross-compilation. These features provide incentive for administrators researchers to employ them probes. Large-scale projects, BISMark RIPE, have already deployed than hundreds vantage points measure Internet from edge.Our previous work showed that embedded much lower packet send-time...
Based on the principle of TWSTFT, technology satellite Orbit Determination by Two-way Tracking (ODTT) is proposed in this contribution. In contrast to signal transmitted from and received same station ODTT. The time delay Geostationary (GEO) satellite, then back can be precisely measured, which realizes range determination between satellite. determined ranges several stations dynamic models for orbit determination, precise orbits obtained. study, addition ODTT measurement model, methods...
As one of the important parameters satellite transponder, group delay transponder not only determines magnitude signal transmission that is generated by system or network but also closely related to distortion, which has a substantial impact on quality. When in orbit, it difficult measure this index due particularity its position. To overcome problem, paper proposes method for measuring an on-orbit transponder. By using two sets ground station antenna systems are installed parallel conduct...
Network performance monitoring and troubleshooting is a critical but challenging task in data center management. Although many solutions have been proposed the past decades, it still difficult to deploy them real world because of expensive cost. In this work, we propose LMon, network measurement fault localization system for facilitating long-term maintenance datacenter networks. LMon employs lightweight tool based on packet pair technique, which supports bi-directional only one end host...
Network performance monitoring and troubleshooting is a crucial but challenging task in datacenter management. Despite the numerous solutions that have been proposed recent years, their efforts are often hindered by high costs unreliable fault localization, making it difficult to deploy them real-world environments. In this paper, we present LMon, highly reliable efficient system for networks. LMon utilizes characteristic of ECMP hashing linearity control packet routing without any...