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A Secure co.municating While Jamming Approach for End-to-End Multi-Hop Wireless co.munication Network

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Chinese Journal of Electronics 2024年第3期33卷 833-846页

作者： Xiao MA Dan LI Liang WANG Weijia HAN Nan ZHAO School of Physics and Information technology Shaanxi Normal University beijing aerospace science and industry century satellite hi-tech co. Ltd.Xi'an Branch School of co.puter science Shaanxi Normal University School of Teleco.munications Engineering Xidian University

With the rapid development of wireless co.munications,cellular co.munication and distributed wireless network are fragile to eavesdropping due to distributed users and transparent ***,to adopt bigger transmit power at a given area to interfere potential eavesdroppers not only incurs huge energy waste but also may suppresses regular co.munication in this *** this end,we focus on secure co.munication in multi-hop wireless co.munication network,and propose two co.municating while jamming schemes for secure co.munication in presence of potential eavesdroppers for the narrow band and broad band point-to-point(P2P) systems respectively with the aid of artificial noise transmitted by a chosen co.perative ***,to achieve the end-to-end(E2E) multi-hop secure co.munication,we devise the secure network topology disco.ering *** co.structing a proper network topology with at least one proper node as the co.perative interferer in each hop,and then propose the secure transmission path planning scheme to find an E2E secure transmission route from source to destination,*** on the wireless open-access research platform demonstrate the feasibility of the proposed ***,simulations results validate that the proposed schemes can achieve better performance co.pared with existing methods in both the P2P co.munication case and E2E multi-hop co.munication network scenario.

关键词： Wireless co.munication Network topology Law Simulation Wireless networks Noise Spread spectrum co.munication

The TripleSat co.stellation:a new geospatial data service model

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Geo-Spatial Information science 2017年第2期20卷 163-173页

作者： Qiang Wen Jianjun He Shengyong Guan Ting Chen Yin Hu Wenbin Wu Feng Liu Yuexia Qiao Suet Yheng Kok Samuel Yeong 21st century aerospace technology co. Ltd.BeijingChina 21st century aerospace technology(Asia)Pte.Ltd. Singapore

With the increase of different sensors,applications and customers,the demand from data providers and users is for a new geospatial data service model,which supports low co.t,high dexterity,and which would provide a co.prehensive *** on such requirements and demands,the 21AT TripleSat co.stellation terminal and data delivery and management system has been developed by a beijing based high-tech enterprise,Twenty First century aerospace technology co.,Ltd.(21AT).The co.pany is the first co.mercial Earth observation satellite operator and service provider in *** new geospatial data service model allows the user to directly access multi-source satellite data,manage the data order,and carry out automatic massive data production and *** solution also implements safe and hierarchical user management,statistical data analysis,and automatic information *** addition,a mobile application is also available for users to easily access system *** new geospatial solution has already been successfully applied and installed in many customer sites in China,and is now available globally for international clients interested in fast geospatial *** enables the success of customers’operational *** providing TripleSat co.stellation images,the multi-source data access system also allows the users to access other satellite data sources,based on customized *** paper describes and discusses this new geospatial data service model.

关键词： Geospatial data service model 21AT TripleSat co.stellation geospatial instant service system

Design of co.munication relay mission for supporting lunar-farside soft landing

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science China(Information sciences) 2018年第4期61卷 73-86页

作者： Weiren WU Yuhua TANG Lihua ZHANG Dong QIAO Lunar Exploration Program and Space Engineering Center School of aerospace Engineering Beijing Institute of Technology Dong Fang Hong satellite co.Ltd. Key Laboratory of Autonomous Navigation and co.trol for Deep Space Exploration Ministry of Industry and Information Technology

Chang’E-IV will be the first soft-landing and rover mission on the lunar farside. The relay satellite, which is located near the Earth-Moon L2 point for relay co.munication, is the key to the landing mission. Based on an analysis of the characteristics of the task and the technical difficulties associated with the relay satellite system, the overall design scheme of the relay co.munication mission is proposed in terms of trajectory design and co.munication system design among other aspects. First, acco.ding to the co.plex dynamic environment, a mission orbit that serves as an uninterrupted co.munication link is presented. A short-duration and low-energy transfer trajectory with lunar flyby is discussed. Orbital co.rection and a low-co.t co.trol strategy for orbit maintenance in the Earth-Moon L2 point region are provided. Seco.d,co.sidering the existing technical co.straints, the requirement of relay co.munication in different stages and the design schemes of frequency division and redundant relay co.munication system are introduced. Finally,based on the trajectory design index and the performance of the co.munication system, the overall design scheme of the relay co.munication mission is proposed. This mission will provide the technical support and reference required for the Chang’E-IV mission.

关键词： lunar farside soft landing relay co.munication Earth-Moon Lagrange point

Reinforcement learning based dynamic distributed routing scheme for mega LEO satellite networks

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Chinese Journal of Aeronautics 2023年第2期36卷 284-291页

作者： Yixin HUANG Shufan WU Zeyu KANG Zhongcheng MU Hai HUANG Xiaofeng WU Andrew Jack TANG Xuebin CHENG School of Aeronautics and Astronautics Shanghai Jiao Tong UniversityShanghai 200240China School of Astronautics Beihang UniversityBeijing 100191China School of aerospace Mechanical and Mechatronic EngineeringThe University of SydneyCamperdown 2006Australia X-Laboratory The Second Academy of China Aerospace Science and Industry CorporationBeijing 100854China

Recently,mega Low Earth Orbit(LEO)satellite Network(LSN)systems have gained more and more attention due to low latency,broadband co.munications and global co.erage for ground *** of the primary challenges for LSN systems with inter-satellite links is the routing strategy calculation and maintenance,due to LSN co.stellation scale and dynamic network topology *** order to seek an efficient routing strategy,a Q-learning-based dynamic distributed Routing scheme for LSNs(QRLSN)is proposed in this *** achieve low end-toend delay and low network traffic overhead load in LSNs,QRLSN adopts a multi-objective optimization method to find the optimal next hop for forwarding data *** results demonstrate that the proposed scheme can effectively disco.er the initial routing strategy and provide long-term Quality of Service(QoS)optimization during the routing maintenance *** addition,co.parison results demonstrate that QRLSN is superior to the virtual-topology-based shortest path routing algorithm.

关键词： LEO satellite networks Mega co.stellation Multi-objective optimization Routing algorithm Reinforcement learning

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A study of the temporal and spatial variations in the suitability of the environment in Chinese cities for tourism and in strategies for optimizing the environment

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International Journal of Digital Earth 2022年第1期15卷 527-552页

作者： Ying Li Shuhui Zhang Jingting Han Yi Zhao Quan Han Liyun Wu Xin Wang Ziyi Qiu Tongqian Zou Cheng Fan China Academy of Culture and Tourism Beijing International Studies UniversityBeijingPeople’s Republic of China State Key Laboratory of Resources and Environmental Information System Institute of Geographic Sciences and Natural Resources ResearchChinese Academy of ScienceBeijingPeople’s Republic of China beijing Boneng technology co. LtdBeijingPeople’s Republic of China beijing Qinxing International Cultural Exchange Center BeijingPeople’s Republic of China State Environment Protection Key Laboratory of satellite Remote Sensing Aerospace Information Research InstituteChinese Academy of SciencesBeijingPeople’s Republic of China

With the aim of guaranteeing the interests and health of tourists,this study co.prehensively evaluates the suitability of the environment in different cities in China for tourism by co.sidering the impacts of climate,vegetation and environmental factors on *** Universal Thermal Climate Index(UTCI),total precipitation(PREC),Vegetation Leaf Area Index(LAI),co.centration of particulate matter with a diameter of less than 2.5μm(PM2.5),and the downward UV radiation at the surface(UVB)are used as *** addition,the Delphi–AHP–TOPSIS algorithm is introduced and is used for the co.prehensive evaluation of the environmental suitability of 684 cities in China for tourism in *** is found that Chinese cities vary greatly in terms of the suitability of their environments for *** the factors that affect the environmental suitability,the LAI is important,with an increase in the LAI generally being *** co.trast,an increase in the PM2.5 co.centration is a key factor that limits the environmental suitability of an ***,urban landscaping and co.trol of the atmospheric quality are essential and effective ways of improving the suitability of the environment of cities in China for tourists.

关键词： Suitability of tourist environment UTCI Delphi–AHP–TOPSIS decision support

Advances in BeiDou Navigation satellite System(BDS)and satellite navigation augmentation technologies

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satellite Navigation 2020年第1期1卷 126-148页

作者： Rui Li Shuaiyong Zheng Ershen Wang Jinping Chen Shaojun Feng Dun Wang Liwen Dai School of Electronic and Information Engineering Beihang UniversityNo.37 Xueyuan RoadHaidian DistrictBeijingChina Suzhou Institute Beihang UniversitySuzhou 215200China co.lege of Electronic and Information Engineering Shenyang Aerospace UniversityNo.37 Daoyi South StreetDaoyi DistrictShenyangChina beijing satellite Navigation Center No.22 Beiqing RoadHaidian DistrictBeijingChina Qianxun Spatial Intelligence Inc. C5 BuildingNo.1688-38 North Guoquan RoadYangpu DistrictShanghaiChina Space Star technology co. Ltd.Blue Lake Industry ParkHaidian DistrictBei-jingChina John Deere-Intelligent Solution Group 20780 Madrona AvenueTorranceCAUSA

Several noteworthy breakthroughs have been made with the BeiDou Navigation satellite System(BDS)and other global navigation satellite systems as well as the associated augmentation systems,such as the co.missioning of the BDS-3 preliminary system and the successful launch of the first BDS-3 GEO satellite which carries the satellite-based augmentation ***,BDS can provide basic services globally,and its augmentation system is also being *** paper gives an overview of BDS and satellite navigation augmentation *** overview is divided into four parts,which include the system segment technologies,satellite segment technologies,propagation segment technologies,and user segment *** each part,these technologies are described from the perspectives of preliminary information,research progress,and ***,the significance and progress of the BeiDou satellite-based Augmentation System(BDSBAS),low earth orbit augmentation,and the national BeiDou ground-based augmentation system are presented,along with the airborne-based augmentation ***,the co.clusions and discussions co.ering popular topics for research,frontiers in research and development,achievements,and suggestions are listed for future research.

关键词： BeiDou Navigation satellite System satellite navigation augmentation systems System segment technologies satellite segment technologies Propagation segment technologies User segment technologies

Ultra Dense satellite-Enabled 6G Networks:Resource Optimization and Interference Management

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China co.munications 2023年第10期20卷 262-275页

作者： Xiangnan Liu Haijun Zhang Min Sheng Wei Li Saba Al-Rubaye Keping Long School of co.puter&co.munication Engineering University of Science and Technology BeijingBeijing 100083China beijing Engineering and technology Research Center for co.vergence Networks and Ubiquitous Services University of Science and Technology BeijingBeijing 100083China School of Teleco.munications Engineering Xidian UniversityXi’an 710071China State Radio Monitoring Center of China Beijing 100037China School of aerospace Transport and Manufacturing Cranfield UniversityMK430ALUK

With the evolution of the sixth generation(6G)mobile co.munication technology,ample attention has gone to the integrated terrestrial-satellite *** paper notes that four typical application scenarios of integrated terrestrial-satellite networks are integrated into ultra dense satellite-enabled 6G networks *** the subchannel and power allocation schemes for the downlink of the ultra dense satellite-enabled 6G heterogeneous networks are *** mobile edge co.puting(SMEC)with edge caching in three-layer heterogeneous networks serves to reduce the link traffic of ***,a scheme for interference management is presented,involving quality-of-service(QoS)and co.tier/cross-tier interference *** simulation results show that the proposed schemes can significantly increase the total capacity of ultra dense satellite-enabled 6G heterogeneous networks.

关键词： satellite-enabled 6G networks network architecture resource optimization interference management

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