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Integrated constellation design and deployment method for a regional augmented navigation satellite system using piggyback launches

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Astrodynamics 2021年第1期5卷 49-60页

作者： Shuai Guo Wanmeng Zhou Jin Zhang Fuyu Sun Dateng Yu College of Aerospace and Engineering National University of Defense TechnologyChangsha 410073China China Astronaut Research and Training Center Beijing 100094China Beijing Institute of Tracking and Telecommunications Technology Beijing 100094China

The method proposed in this paper is adopted to solve problem B of the 9th China Trajectory Optimization Competition(CTOC).An accurate and economical constellation design strategy for regional augmented navigation satellite systems(RANSSs)has attracted a substantial amount of research interest owing to the increased demand for navigation services in complex environments.This paper proposes a hybrid method of constellation design and deployment for a RANSS to satisfy the navigation performance requirements and minimize the construction cost.First,the search spaces of the design parameters are determined by analyzing the orbital parameters of piggyback launches.Second,the constellation is designed as a combined Walker constellation and optimized by a differential evolution(DE)algorithm.Finally,optimal strategies for deploying satellites to the desired orbits are obtained using a transfer optimization design.The method was adopted to design a RANSS for servicing the 182 cities in the Asia-Pacific region.The configuration consists of five orbital planes and 80 navigation satellites and achieves a low construction cost with 10 piggyback launches.Furthermore,the constellation can cooperate with an existing navigation satellite system to further improve the navigation accuracy for all cities.The results reveal that the RANSS design and deployment problem can be effectively solved with a low construction cost and high navigation performance.

关键词： constellation design regional navigation augmentation piggyback launches trajectory optimization

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AI-Enhanced constellation design for NOMA System: A Model Driven Method

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China Communications 2020年第11期17卷 100-110页

作者： Sen Wang Hanxiao Yu Yifei Yuan Guangyi Liu Zesong Fei Future Mobile Technology Lab China Mobile Research InstituteBeijing 100053China Beijing Institute of Technology Beijing 100081China

Grant-free Non-orthogonal Multiple Access(GF-NOMA)is a promising technology for massive access users and sporadic small-packet transmission for Beyond the 5th Generation mobile communication system(B5G)/the 6th Generation mobile communication system(6G).One of the key aspects in GF-NOMA system is the signature/constellation design.However,due to the channel variation and random activation of users,conventional optimization approaches seem unsuitable for such complex models.In this paper,as an initial attempt,we propose a human intelligence(HI)-guided artificial intelligence(AI)-enhanced signature/constellation design method.By separate design of modulation and power allocation inspired by prior knowledge,the proposed deep neuron network(DNN)for NOMA signature/constellation design not only has smaller size of DNN and less training data,but also has stronger interpretability.In the last section,via simulations we demonstrate that in terms of bit error rate,the proposed scheme can achieve significant performance gain over the conventional NOMA schemes.

关键词： NOMA system DNN constellation design power allocation

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Joint information transmission design for intelligent reflecting surface aided system with discrete phase shifts

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Science China(Information Sciences) 2023年第3期66卷 253-262页

作者： Qin TAO Shuowen ZHANG Caijun ZHONG Yushu ZHANG College of Information Science and Electronic Engineering Zhejiang University Department of Electronic and Information Engineering The Hong Kong Polytechnic University Aerospace Information Research Institute Chinese Academy of Sciences

This paper studies the joint information transmission for an intelligent reflecting surface(IRS)aided single-input multiple-output(SIMO) communication system, where an IRS with discrete phase shifts aims to deliver its sensed information to the receiver, besides being a helper of the SIMO system. We first introduce the joint modulation strategy for delivering the information of the primary system and the IRS simultaneously. Specifically, the IRS modulates its information in both the received antenna index and the received signal phase; while the transmitter limits its signal phase in a small region to avoid aliasing. For the proposed strategy, we devise an IRS discrete phase shifts design to maximize the received signal power at the selected receive antenna. Then, we propose a receiver constellation design for the IRS’s and transmitter’s information to maximize the minimum Euclidean distance. Numerical results show that the proposed scheme is practical and competitive compared with several existing joint information transmission schemes.

关键词： IRS information transmission constellation design

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A novel two-layered optical satellite network of LEO/MEO with zero phase factor

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Science China(Information Sciences) 2010年第6期53卷 1261-1276页

作者： LI YongJun , WU JiLi, ZHAO ShangHong, MENG Wen, MA LiHua, SHI Lei, CHU XingChun, HOU Rui & LI Tian Telecommunication Engineering Institute, Air Force Engineering University, Xi’an 710077, China Telecommunication Engineering Institute Air Force Engineering University Xi’an China

Optical satellite communication has advantages over the RF satellite communication in capacity, speed, secrecy and anti-interference.Space information superhighway composed of GEO/MEO/LEO satellites which are linked by optical inter-satellite links(OISL) would play important roles in communication, navigation, martial recon, remote sensing and deep space exploration.A novel LEO/MEO two-layered optical satellite network with global coverage is designed with the street-of-coverage technique.The layer of LEO satellites is the walker-delta constellation with zero phase factor and has the quasi-stable logical structure of Mesh.Equatorial and polar orbit satellites constitute the layer of MEO satellite, which can cover LEO layer effectively.Rising satellites of the system can provide 99.9% of coverage for the whole globe and 100% for China averagely.The network can provide a minimum elevation angle at 21 ? with single-satellite visibility for China, and at 16 ? with the dual-satellite visibility.Simulation results of the inter-satellite links show LEO constellation of zero phase factor outperforms non-zero phase factor constellations in azimuth angle, elevation angle and distance, which is very fit for the OISL.Simulation results of the communication performance indicate a little difference between short wave band and long wave band at low communication speed(several Gbit/s);however, the wave band at 1550 nm is a better choice at high communication speed(100 Gbit/s).

关键词： optical satellite communication optical satellite networks constellation design two-layered constellation optical inter-satellite links

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通信星座综合性能优化(英文)

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China Communications 2011年第5期8卷 96-101页

作者：陈小燕韩潮 School of Astronautics Beihang University

In order to attain better communications performance rather than just expand coverage and save system cost,criteria related to the communications quality and capacity are extracted and revised to build an integrated performance metric system which aims to effectively guide the satellite communications constellation design.These performance metrics together with the system cost serve as the multiple objectives whilst the coverage requirement is regarded as the basic constraint in the optimization of the constellation configuration design applying a revised NSGA-II algorithm.The Pareto hyper-volumes lead to the best configuration schemes which achieve better integrated system performance compared with the conventional design results based merely on coverage and cost.

关键词： satellite communications constellation design performance metrics multi-objective optimization

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design of Mega-constellations of LEO Satellites for Positioning

Design of Mega-Constellations of LEO Satellites for Position...

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第九届中国卫星导航学术年会

作者： Xingchi He Urs Hugentobler Technische Universit?t München

With the huge potential of the GNSS market and thousands of LEO satellites in space in the future,a novel way is to use these LEO mega-constellations for positioning.In order to fulfil this purpose,the first step is to build a constellation that could be used for both communication and positioning.This paper discusses about some critical issues when designing LEO mega-constellations for positioning.By statistically analyzing from different perspectives,it is shown that in order to get a more uniform distribution of the number of visible satellites along latitude,the combination of different constellations together as a whole could be much more appealing.Meanwhile,in this paper,we did some preliminary work about how to determine some important parameters to get the most suitable combination.The selection of inclinations,orbit heights,number of combined constellations,and ratio of the number of satellites in each constellation will be discussed.

关键词： constellation design LEO satellite GNSS Combined constellation Walker constellation

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Simulation Analysis of LEO Satellite Navigation-augmented Property Based on Beidou-3

Simulation Analysis of LEO Satellite Navigation-augmented Pr...

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第十一届中国卫星导航年会

作者： Dixing Wang Xiaolin Jia Jiangwei Li School of Geology Engineering and Surveying Chang’an University Xi’an Research Institute of Surveying and Mapping School of Surveying and Mapping Science and Technology Xi ’an University of Science and Technology

Low Earth orbit(LEO) satellites have unique advantages in navigation enhancement due to their high signal strength and rapid geometric changes, has become a hot spot in the field of satellite navigati

关键词： Low Earth orbit Satellites Navigation Augmentation constellation design Observation simulation

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