卫星星座网络容量密度评估  

Capacity Density Assessment of Satellite Constellation Network

作　　者：孟贤[1] 秦大力 汪宇[1] 孔垂丽 罗禾佳[1] 王俊[1] MENG Xian;QIN Dali;WANG Yu;KONG Chuili;LUO Hejia;WANG Jun(Huawei Technologies Co.,Ltd.,Hangzhou 310052,China)

机构地区：[1]华为技术有限公司,浙江杭州310052

出　　处：《天地一体化信息网络》2023年第3期67-78,共12页Space-Integrated-Ground Information Networks

摘　　要：采用传统分析方法在较低波束密度场景下会极大低估系统的吞吐能力,且无法揭示出高波束密度场景下出现的容量饱和现象。为了克服上述问题,提出一种全新的系统仿真方法,以对卫星网络及星地一体化网络的容量密度指标进行精确评估。基于此方法,首先,评估地球不同经纬度区域的容量密度,可以观察到,随着卫星运动,相同地区的容量密度变化较大,其最大最小容量密度的比值可达两倍;其次,可见性越高的地区通常具有更高的容量密度,高频场景下,气衰对容量密度的影响不可忽略;最后,针对星地融合系统,评估结果显示蜂窝覆盖和卫星覆盖的容量密度可以相差4个数量级。为了提升星座容量密度,尝试用提升最大点亮波束数和提升卫星规模两种技术路径。结果显示,在星座总波束相同的情况下,提升卫星规模时性能更优;但两种提升星座总波束数的方式都存在容量上界,且边际效应显著下降。为此,最后提出提高卫星天线增益的方案,仿真结果表明所提方案可以显著提升星座容量密度。The traditional analytical method greatly underestimates the throughput capability of the system in low beam density scenario,and cannot reveal the capacity saturation phenomenon in high beam density scenario.To overcome the preceding problems,a new system simulation method was proposed to accurately evaluated the capacity density indicator of satellite constellation network and integrated satellite and terrestrial network,Based on this method,first,the capacity density of different longitude and latitude regions of the earth was evaluated.It could be observed that the capacity density of the same region varies greatly with the movement of the satellite,and the maximum capacity density was twice the minimum.Then,areas with higher visibility usually had higher capacity density.In high-frequency scenarios,the impact of atmospheric attenuation on capacity density could not be ignored.Finally,for the integrated satellite and terrestrial network,the evaluation results showed that the capacity density of cellular coverage and satellite coverage could differ by four orders of magnitude.In order to improved the capacity density of satellite constellation network,two technical paths were attempted:increasing the maximum number of illuminated beams and increasing the satellite scale.The results showed that the performance was better when the constellation scale was increased when the total beams of the constellation were the same.However,the two ways to increase the total number of beams in a constellation had an upper bound on capacity,and the marginal effect decreased significantly.Finally,a scheme to increase the gain of satellite antenna was proposed.The simulation results showed that the proposed scheme could significantly increase the capacity density of constellation.

关 键 词：大规模低轨卫星星座 容量密度 星地融合网络 

分 类 号：TP393[自动化与计算机技术—计算机应用技术]