A5012366333- GNSS positioning and interference
- Geophysics and Gravity Measurements
- Access Control and Trust
- Ionosphere and magnetosphere dynamics
- Inertial Sensor and Navigation
- Advanced Frequency and Time Standards
- Security and Verification in Computing
- Cryptography and Data Security
- Cloud Data Security Solutions
- Satellite Communication Systems
- Mobile Agent-Based Network Management
- Advanced Decision-Making Techniques
- Simulation Techniques and Applications
- Security in Wireless Sensor Networks
- Service-Oriented Architecture and Web Services
- IPv6, Mobility, Handover, Networks, Security
- Indoor and Outdoor Localization Technologies
- Advanced Computational Techniques and Applications
- Network Traffic and Congestion Control
- Aerospace Engineering and Control Systems
- Digital Rights Management and Security
- Advanced Data Processing Techniques
- Cognitive Radio Networks and Spectrum Sensing
- Multi-Agent Systems and Negotiation
- Telecommunications and Broadcasting Technologies
Beijing Satellite Navigation Center
2022-2024
China Telecom (China)
2021-2024
Beijing University of Posts and Telecommunications
2023
Naval University of Engineering
2021
National University of Defense Technology
2010-2019
Guilin University of Technology
2019
Luoyang Institute of Science and Technology
2016
Shanghai University of Engineering Science
2014
Chongqing University of Posts and Telecommunications
2012
Research Institute of Highway
2010
Abstract With the rapid development of technologies such as autonomous driving and robotic navigation, demand for accurate reliable positioning results with BDS has increased. The current status future high precision services are reviewed. operational PPP-B2b BDS-3 achieves accuracy at decimeter-level within 14 min drawbacks in regional coverage long convergence time compared international counterparts, CLAS QZSS HAS Galileo. A frame multi-layer high-precision is proposed by considering its...
Global navigation services from the quad-constellation of GPS, GLONASS, BDS, and Galileo are now available. The international GNSS monitoring assessment system (iGMAS) aims to evaluate performance current quad systems under a unified framework. In order assess impact orbit clock errors on positioning accuracy, user range error (URE) is always taken as metric by comparison with precise products. Compared solutions single analysis center, combined derived multiple centers characterized...
Nowadays more and activities are performed over the Internet. But as people involved in transaction circle, security authorization control becomes one of biggest concerns. Hence, We motivated by need 10 manage to enforce a strong mechanism large-scale web-environment. Role based access (RBAC) provides some flexibility management. Public key infrastructure (PKI) can provide authentication. Privilege management (PMI) new technology authorization. In order satisfy mentioned requirements, we...
Summary In this paper, a three‐layered medium Earth orbit (MEO), geostationary (GEO), and inclined geosynchronous (IGSO) satellite network (IGMSN) is presented. Based on the idea of time‐slot division, novel dynamic hierarchical distributed QoS (quality service) routing protocol (HDRP) investigated, an adaptive bandwidth‐constrained minimum‐delay path for IGSO/GEO/MEO architecture constellation (BMDP‐HAC) algorithm developed to calculate tables efficiently using metric information composed...
In this paper, we introduce a new paradigm for access control and authorization management, called team task based RBAC (TT-RBAC). TT-RBAC model extends the NIST through adding sets of two basic data elements teams tasks. This as whole is fundamentally defined in terms individual users being assigned to roles teams, tasks permissions By virtue membership, get team's resources specified by However, each user, exact privilege he/she obtains from determined his/her current activity team. So can...
Since the US military experienced several local wars, it deeply recognized importance of unmanned combat systems. Nowadays, with improvement autonomy weapons and equipment, number scale equipment are becoming larger larger, task is more extensive. Unmanned presents some new characteristics like distribute networked traditional force coordination. For example, modular fire brigade proposed by a typical coordination organizational structure. Such organizations also have their key entities...
The autonomous orbit determination of the navigation constellation uses only bidirectional ranging data inter-satellite link for processing. lack space-time benchmark information related to Earth inevitably causes overall rotational uncertainty in constellation, leading a decrease accuracy and affecting user positioning accuracy. This study (1) introduces method rotation correction distributed based on ranging; (2) conducts time synchronization processing experiments 24 medium (MEO)...
The Global Navigation Satellite Systems (GNSSs) apply conventional relativistic corrections to correct apparent clock offsets. However, with the continuous improvements made time synchronization approaches and onboard atomic clocks, this model has obviously limits accuracy of BDS-3 intersatellite synchronization, also limited performance clocks. This study demonstrates that amplitude GNSS periodic errors can reach 0.08 ns for MEO IGSO satellites within a day, 0.40 month. frequency stability...
The mapping function is crucial for the conversion of slant total electron content (TEC) to vertical TEC low Earth orbit (LEO) satellite-based observations. Instead collapsing ionosphere into one single shell in commonly used models, we defined a new assuming ionospheric distribution as an exponential profiler with simple parameter: plasmaspheric scale height zenith direction LEO satellites. obtained by empirical model introduces spatial and temporal variances function. performance method...
To effectively participate in modern collaborations, member organizations must be able to share specific data and functionality with collaboration partners, while ensuring their resources are safe from inappropriate access. This requires access control models, policies, enforcement mechanisms for the shared resources. paper specifically addresses how reduce information leaks caused by authorization policies used collaborative computing environment. The basic principle is defining some labels...
While role-based access control (RBAC) as an alternative to traditional discretionary and mandatory controls is very effective popular, subsequent attempts apply it in various application environments also revealed some limitations of RBAC. We developed a new type security policy, called label-based policy (LBACP) that can be used for enhancing Unlike other policies, LBACP not independently. On the contrary, should combined with policies. The basic principle defining labels specify...
Summary This study is extended to construct the network model, node and link model of complex communication for satellite navigation system (CCN‐SNS) based on hierarchical architecture. Firstly, a method called snapshots was proposed describe dynamic topology CCN‐SNS; secondly, another put forward different nodes thirdly, links between every two were modeled. Therefore, OPNET tools, simulation CCN‐SNS, which contains models that earlier used analyze accuracy transmission performance, performed.
In this paper we propose a secure middleware system that provides security functionalities in its integrated components instead of services. Public key infrastructure (PKI), attribute certificate (AC) and policy are employed separated role based access control (RBAC) model. The managed guided by routing workflow models the execution environment cooperative software from structure relation to running time state results high flexibility dynamic reconfiguration multisolutions supporting
The feature of deception jamming for GNSS-dot networks is researched and analyzed, it difficult to accurately locate correct the interference position by using detection methods traditional WSN, a new attack algorithm that based on an improved angle arrival (AOA) positioning mechanism determine point disruption correction proposed. Nextly single source localization hyperbolic method anti-jamming principle GNSS given, can both multiple sources. Then indicators performance evaluation are...