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在低轨电子侦察、遥感卫星领域,针对非连续覆盖条件下的星座优化设计问题,提出了一种间隔重访的低轨星座设计方法。通过改进极轨覆盖带设计方法,将对地覆盖区域等效为矩形;以对地目标的平均重访间隔时间为输入,从同轨卫星间和相邻轨道面间两方面分析,得到近似最优的星座参数。通过STK仿真验证,设计的星座可满足重访间隔时间要求。 相似文献
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中国低轨移动卫星通信系统星座设计 总被引:15,自引:2,他引:13
本文研究低轨移动卫星通信系统设计中的一个基本问题--星座设计问题,并给邮了我国低圆轨道移动卫星通信系统的星座设计方案,该星座是以三个轨道平面组成的24颗星系统,它的高度为1326km,轨道参数由本文提出的优化算法进行设计,本文用统计的方法对我国低轨系统方案和Globalstar系统(24颗星方案)的覆盖性能进行分析比较,结果表明本文提出的系统对我国的覆盖特性优于Globalstar系统,本文还对圆 相似文献
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该文讨论了使用中轨共地面轨迹星座建立区域覆盖卫星通信系统的优化设计方法。在深入研究共地面轨迹星座参数特性的基础上,提出了一种能够完整描述该类型星座的编码标识方法,推导了星座与星座的等价关系,讨论了利用该类型星座实现区域覆盖时的优化方法,给出了适用于我国的多个优化星座方案实例。从仿真结果可以看出,该类型星座能够以较少数量的卫星为我国提供良好的覆盖性能,适于我国的区域覆盖卫星通信系统采用。 相似文献
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低轨卫星网络具有低成本、大容量、广覆盖的特性,是未来空天地海一体化网络中的重要支柱和6G网络的关键组成部分,开展链路分析对于低轨星座链路设计与优化具有重要意义。由于低轨卫星移动性强、星地电磁环境复杂、链路较长等特点,星地信息传输与传统地面移动通信有着显著差异。根据低轨星座的特性构建星座网络的随机几何BPP模型,并针对低轨星座空间分布及移动特征,分析了单星及多星场景下的损耗、干扰等对星地通信链路的影响。通过给出星座系统干扰期望计算方法,并基于所构建BPP网络对星地通信链路特性进行仿真。仿真结果表明,构建随机几何的基于BPP分布的星座模型可以很好地模拟卫星网络的状态,采用随机几何对低轨星座下行通信链路进行仿真分析,能够得到更具泛化的星座构型下低轨星座对地面站的干扰情况,为巨型低轨星座网络分析及星地链路设计提供了参考。 相似文献
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低轨(Low Earth Orbit,LEO)高通量卫星将成为未来非地面网络的重要组成部分。基于星上灵活载荷技术,探索未来6G星地网络动态高效的多维资源调度和多指标优化方法。实际优化过程中,多个指标间如吞吐量、接入用户数等往往相互冲突。已有工作多通过加权求和将多个优化目标转换为单目标优化问题进行求解。然而此种方法通常存在不同目标函数之间量纲单位无法统一,病态矩阵造成各目标函数权重无法准确分配,以及在大规模优化中难以接近帕累托前沿等问题。针对星地融合网络如何同时提高终端接入数量与提高多用户吞吐的优化问题,建立单目标和多目标优化模型,通过对单目标优化问题分配不同权重,进行最优求解,产生多组优化结果作为性能比较的基准方案之一,提出基于快速非支配排序与自适应算子调整的高效多目标优化算法。实验结果表明,所提算法较加权单目标优化与传统多目标优化算法,可有效提升整体的优化性能,进而提升星地融合网络的通信性能。 相似文献
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Richard A. Raines Nathaniel J. Davis 《International Journal of Communication Systems》1999,12(3):197-215
This paper extends previous research efforts related to the simulation performance modelling and analysis of satellite communication networks. Specifically, the use of low earth orbit (LEO) satellite networks for personal communications is examined. Six different satellite constellation configurations are investigated in a packet‐switched operating environment. Performance metrics examined are the end‐to‐end packet delay and the utilization of satellite channels in the dynamic environment. Realistic and accurate models of the physical satellite network and its terrestrial transmitters require that numerous operating characteristics and assumptions be specified. These are based on proposed design requirements of commercial systems, such as Iridium. Via the use of simulation, we show the relative delay and utilization performance of differing satellite network architectures. From these simulation models, mathematical metamodels are derived for the system delays. These innovative models are used to predict the delay performance of different network architectures not previously simulated. Comparison of these metamodels with simulation results show that metamodels provide an accurate means for performance prediction. Copyright © 1999 John Wiley & Sons, Ltd. 相似文献
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Ravandran Muttiah 《International Journal of Satellite Communications and Networking》2023,41(5):441-459
Satellite constellation design plays an important role in satellite networks. Network constellation system design can affect the effectiveness of current improvements of the communications link and the management of the entire network. The power requirement of the mobile stations and ground stations is very high in a geostationary Earth orbit communication system, which means the terrestrial terminal is hard to be made handheld for fifth generation mobile communications. The emergence of nongeostationary orbit satellites such as low Earth orbit satellites greatly compensates for the disadvantage of geostationary Earth orbit satellites. Based on the classical constellation design method, the orthogonal circular orbit constellation is proposed. The design objectives considered here are the following: global Earth coverage by low Earth orbit satellites, the duration of continuously covering one mobile station by one satellite is more than 9.57 min, the access satellite link duration time of the mobile station is more than 4.79 min, and the number of satellites and orbits is to be minimum. 相似文献