卫星互联网若干关键技术研究

doi:10.11959/j.issn.1000-436x.2021156

Abstract

Abstract:

Satellite Internet has the ability of global seamless coverage, which will be an important part of the future land-sea-air-space integrated network.Firstly, the architecture of satellite Internet was discussed, which included the general composition of the system, networking mode, working process, etc.Secondly, the methods of modeling broadband and narrowband traffic were proposed to extract the uneven space-time distribution characteristics of traffic for satellite Internet.Then, the co-frequency interference of spectrum-sharing was analyzed, showing that there would be more serious co-frequency interference among different non-geostationary satellite orbit (NGSO) constellations in the future.Next, the schemes of both beamforming design for low earth orbit satellite and beam-hopping design for high orbit satellite were explored, which could significantly improve the system capacity through efficient mining of space-domain resources.Finally, the development prospect of several technologies of satellite Internet were given.

Key words: satellite Internet, architecture design, traffic model, beamforming, interference analysis

CLC Number:

TN92

Gengxin ZHANG, Yunfeng WANG, Xiaojin DIGN, Tao HONG, Ziwei LIU, Chen ZHANG. Research on several key technologies of satellite Internet[J]. Journal on Communications, 2021, 42(8): 1-14.

Figures/Tables 20

References 24

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类别	卫星/星座	下行带宽/GHz	频谱效率/(bit·(s·Hz)^-1)	波束数	频率复用因子	单星容量/(Gbit·s^-1)
低轨星座	OneWeb	2	2.4	16	2	9.6
	StarLink	2	2.7	8	4	21.6
GEO-HTS	Viasat-3	3.5	1.1	1 000	250	1 000

星座	用户上行/GHz	馈电上行/GHz	用户下行/GHz	馈电下行/GHz
OneWeb	12.75～14.5	27.5～30.0	10.7～12.7	17.8～20.2
Starlink	14.0～14.5	27.5～30.0	10.7～12.7	17.8～19.3
Telesat	27.5～30.0	—	17.8～20.2	—
Kuiper	27.5～30.0	—	17.7～18.6、18.8～20.2	—

参数	取值
总带宽/MHz	300
窗口长度	256
总功率/W	300
卫星高度/km	35 786
波束半径/km	300
天线发射增益/dB	45
天线接收增益/dB	50
自由空间损耗/dB	210
雨衰/dB	12
信噪比/dB	20
总需求量/(Gbit·s^-1)	10
权重	2

Research on several key technologies of satellite Internet

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