摘要
低轨卫星通信系统在通信领域发挥着越来越重要的作用。针对不同类型星座覆盖能力和星际链路建立条件存在的差异,设计了极轨道和倾斜圆轨道低轨卫星星座,利用STK验证了两种星座的覆盖能力和星际链路AER特性,利用NS2对两种星座卫星网络的时延、吞吐量和丢包率等性能指标进行了仿真,并对所得数据进行了对比分析,结果表明:在由32颗卫星(轨道高度1 450km)构成的低轨星座中,极轨星座的全球覆盖能力、星际链路建立条件和卫星网络性能优于倾斜圆轨道星座,更适合于构建全球低轨卫星通信系统。
LEO satellite communication weighs more and more in communication system now and future .Since different types of constellations have rather different performances in coverage ability and inter-satellite link building conditions ,a polar and an inclined circular orbit constellation were designed in this paper .Coverage ability and ISL performance of con-stellations were simulated by STK while delay ,throughput and jitter of satellite network were simulated by NS2 .The results of simulations were compared and analyzed which indi-cates that ,in a constellation with 32 satellites ,with orbit altitude 1 450 km ,polar orbit con-stellation is more suitable to build global LEO satellite communication system than inclined circular orbit because of its nicer performance in global coverage ,ISL building conditions and network identity .
出处
《全球定位系统》
2014年第3期19-23,共5页
Gnss World of China
关键词
星座设计
星际链路
覆盖
时延
STK
NS2
Constellation design
inter-satellite link
coverage timedelay
throughput
STK
NS2
