Study on Satellite Constellation Spare Strategy Based on Markov Process by LUO Tiansu, ZHAO Lingfeng, FENG Yunwen, XUE Xiaofeng, LU Cheng

Subjects: Get full text

Modeling and simulation analysis of Starlink constellation communication by LI Yuanlong, LI Zhiqiang

“…Starlink is the only giant constellation in low Earth orbit currently being rapidly deployed. This paper analyzes the advantages and characteristics of low orbit satellite communication and summarizes Starlink construction and system architecture. …”
Get full text

Analytical design and performance analysis of LEO mega chain satellite constellation by ZHENG Pengfei, CHEN Hongyu, GUO Chongbin

“…Aiming at the problem to use the minimum satellite number to achieve low revisit time coverage, a LEO (low earth orbit) Walker-chain constellation and its design method is proposed. …”
Get full text

Traffic simulation of broadband LEO constellation satellite communication system by Xu Jun, Lu Wei, Zhang Gengxin

“…Due to the rapid development of small satellite technology，and the advantages of low earth orbit satellite(LEO) with low delay and low propagation loss as compared with the traditional geosynchronous orbit satellite(GEO), the broadband LEO constellation satellite communication system has gradually become one of the most important hot spots in the field of satellite communications. …”
Get full text

Design and Implementation of LEO-5G Downlink Synchronization Algorithm based on FPGA by Wei ZENG, Jun-qiu XIAO, Huan XIA, Lei TAN, Peng ZHANG

“…In response to the urgent need for the development of low-orbit 5th Generation Mobile Networks (5G) protocol standards, R16 protocol standards and terminal baseband chips based on 5G low-orbit broadband satellite communication systems, a Primary Synchronization Signal (PSS) detection algorithm of " two blocks combined and divided into two cross-correlation" is proposed for coarse frequency offset estimation based on the analysis of the Low Earth Orbit (LEO)-5G system's PBCH link structure and downlink time-frequency synchronization overall architecture. …”
Get full text

A random error estimation method for satellites being launched into orbit based on ellipsoid theory by WU Huanqin, WANG Maocai, SONG Zhiming, CHEN Xiaoyu

“…Monte Carlo method and STK software were employed to simulate low-earth orbit micro-nano satellite launching into the same orbital position. …”
Get full text

Deployment Optimization and Computing Offloading of Space-Air-Ground Integrated Mobile Edge Computing System by ZHENG Hongqiang, ZHANG Jianshan, CHEN Xing

“…As a new architecture,the space-air-ground integrated communication technology can effectively improve the network service quality of ground terminal,and has attracted widespread attention in recent years.This paper studies a space-air-ground integrated mobile edge computing system,in which multiple UAVs provide low-latency edge computing services for ground devices,and low earth orbit satellites provide ubiquitous cloud computing services for ground devices.Since the deployment position of the UAVs and the scheduling scheme of computing tasks are the key factors affecting the performance of the system,the deployment position of the UAVs,the link relationship between the ground terminal and the UAVs,and the offloading ratio of computing tasks need to be jointly optimized to minimize the average task response delay of the system.Since the formally defined joint optimization problem is a mixed nonlinear programming problem,this paper designs a two-layer optimization algorithm.In the upper layer of the algorithm,a particle swarm optimization algorithm that combines genetic algorithm operators is proposed to optimize the deployment position of the UAVs,and the greedy algorithm is used in the lower layer of the algorithm to optimize the computing task offloading scheme.The extensive simulation experiments verify the feasibility and effectiveness of the proposed method.The results show that the proposed method can achieve lower average task response time,compared to other baseline methods.…”
Get full text

Development of Novel Network Architectures by Ouyang Man, Liu Jiang, Liao Xinyue, Huang Tao

“…This study expounds on the implication of novel network architecture and presents several representative architectures, including information center network, expressive Internet architecture, low-Earth-orbit satellite network, service customization network, full-dimensional definable network, and multimodal network. …”
Get full text

Proton irradiation damage in silicon carbide junction barrier Schottky diode by LIU Cuicui, LI Zhiming, HAN Jinhua, GUO Gang, YIN Qian, ZHANG Yanwen, LIU Jiancheng

“…However, there are a large number of protons in the typical orbit of spacecraft, which always threaten the stable operation of spacecraft, including its key components.PurposeThis study aims to explore the resist ability of SiC JBSs to the degradation of medium energy proton irradiation, and clarify the mechanism of radiation effect of SiC JBSs from medium energy proton.MethodsBased the proton equivalent displacement damage dose in low Earth orbit for ten years, the SiC JBSs were firstly irradiated using 10 MeV protons at fluences ranging from 3×109 cm-2 to 3×1010 cm-2 at room temperature and without bias voltage. …”
Get full text

Storm time field-aligned currents and magnetosphere-ionosphere coupling process by Hui Wang

“…With the launch of the manufactured satellites and the advent of the space age, the in situ observation of magnetic fields from low Earth orbit satellite provides direct evidence for FACs. …”
Get full text