面向非地面网络多QoS保障的低地球轨道卫星星座设计

doi:10.11959/j.issn.1000-436x.2023225

Abstract

Abstract:

LEO satellite constellation (LSC) offers seamless and fast connectivity for non-terrestrial network (NTN).However, the lack of QoS guarantees for users significantly impacts the performance of the NTN system.Considering multi-QoS metrics, a capacity and downlink budget model for LSC was established, and subsequently, the establishment of inter-satellite links was framed as a link budget issue for the QoS guarantee.The non-dominated sorting genetic algorithm (INSGA-II) with improved crossover and mutation operators was proposed to optimize LSC, aiming to maximize coverage and system capacity while minimizing constellation costs.The numerical results demonstrate that the designed LSC exhibits comparable or superior performance to Telesat and Kepler, and its scale is only 64% of the Kepler system.

Key words: non-terrestrial network, LEO satellite constellation design, QoS guarantee, multi-objective optimization, ISL

CLC Number:

TN927

Ruyan WANG, Xianyi YE, Peng HE, Yaping CUI, Dapeng WU, Fedotov Alexander. LEO satellite constellation design with multi-QoS guarantee for non-terrestrial network[J]. Journal on Communications, 2023, 44(12): 61-77.

Figures/Tables 18

QoS指标	等价参数
误码率	BER₀
星地信息速率	Ruser
星间信息速率	$R_{ISL}^{0}$
多重覆盖率	ρ₀

参数	符号	值
误码率	BER ₀	10^{- 6}
用户数据速率/(Mbit·s^-1)	R_user	40
星间信息速率/(Mbit·s^-1)	$R_{ISL}^{0}$	200
下行链路频率/GHz	f	30
星间链路频率/GHz	fI_SL	40
发射天线增益/dB	G_sat	52.1
接收天线增益/dB	G_r	35
Ka频段噪声功率/(dBm·Hz^-1)	n₀	-174
UE系统噪声温度/K	T_s	135
雨衰+链路余量/dB	[L_Rain+Margin]	15.6
对流层闪烁损耗/dB	[L_trop]	5.8
大气吸收损耗/dB	[L_atmos]	8.4
卫星质量/kg	m_sat	500

δ_min	N_p	$N_{sat}^{p}$	h/km	i	F	$P_{t}^{SGL}$	$P_{t}^{ISL}$
5∘	11	11	905	60∘	1	18.3	7.9
10∘	7	7	990	63∘	1	15.3	18.6
15∘	10	9	1 013	69∘	1	12	11.6
20∘	10	8	1 263	70∘	1	13.3	14.5

星座系统	星座构型[N_p, $N_{sat}^{p}$ ,h,i,F]^T
Designed LSC	[10,9,1013,69.1,1]^T
Telesat	[5,9,1248,37.4,1]^T
Kepler	[20,7,600,98.6,1]^T
Iridium NEXT	[11,6,780,86.4,1]^T
Astrocast	[8,8,575,97.69,1]^T

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参数	值
种群规模p₀	40
进化代数Gen_max	100
交叉参数p_crossover	msat
变异参数p_mutate	2
锦标赛选择算子个体数x_c	2
锦标赛选择概率p_select	0.9

LEO satellite constellation design with multi-QoS guarantee for non-terrestrial network

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