共查询到18条相似文献,搜索用时 109 毫秒
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本文介绍了利用遗传算法优化设计非静止轨道卫星星座的方法——卫星星座遗传算法。由该算法设计出的星座具有卫星数量最少、最小最大卫星高度、卫星间最小相移,最大的轨道面夹角,最优卫星分集轨道倾角和最佳LEO、MEO星座参数。MEO、LEO、ICO和Globalstar星座的仿真结果表明:使用卫星星座遗传算法设计二重卫星分集,不但减少了卫星总数,且卫星分集可见度性能显著提高。 相似文献
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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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针对电子侦察卫星如何对多目标潜在区域进行普察的任务规划问题,通过分析电子侦察卫星的应用场景、任务需求及执行约束,将待观测区域网格化、观测时间离散化以及对观测频率频段化处理,建立解决该问题的时空频三维覆盖优化模型。通过改进编码结构、初始化以及对约束处理等方法,将遗传算法用于该模型的求解。仿真实验表明,改进的算法可以适应多卫星长编码多约束优化问题求解,模型可以优化任务规划结果。 相似文献
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《电子技术与软件工程》2016,(10)
目前混合星座的卫星覆盖分析与仿真是一个热点研究问题。本文设计了大椭圆和地球同步轨道卫星的混合星座模型,对混合星座模型的覆盖情况进行了仿真分析,讨论了GEO星座和不同大椭圆星座组成的两种混合星座的卫星覆盖性能。研究结果对区域观测研究和通信星座设计有一定的参考价值。 相似文献
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Quan Chen Lei Yang Xianfeng Liu Jianming Guo Shuai Wu Xiaoqian Chen 《International Journal of Satellite Communications and Networking》2021,39(1):47-64
Multiple gateways are required in large satellite constellation networks (LSCNs) with inter‐satellite links (ISLs), and their placement may greatly affect the system performance. Gateway placement can be optimized to achieve better network performance under the non‐uniform ground demand distribution. This paper formulates a gateway placement optimization model for LSCN with ISLs, aiming at achieving an optimal overall performance including delay, traffic peak, and load balance. The constraints of potential gateway location, gateway‐satellite connectivity, and max hop‐count are considered. A genetic algorithm (GA)‐based method is proposed to solve the integer optimization problem with the help of quasi‐evenly distributed reference layout. A Starlink‐like constellation with ISLs is adopted in the simulation. The simulation results show that the optimized layout has better performance than the reference layout. Additionally, the locations with high user demand or at the middle of ocean are preferred by gateways. The network performance is jointly influenced by gateway placement, demand distribution, constellation configuration, node, and link capacities. The abnormally high ISL hop‐count is found in the south Indian Ocean, which is caused by constellation and ISL configuration. 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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随着卫星星座的迅猛发展,作为一个庞大的空间系统,卫星星座的运行管理是一个很大的难题。从星座维持控制、备份与阶段部署、自主导航和太空"交通"实时监测等方面论述了卫星星座运行管理的策略和技术方法,同时提出为了保证卫星星座的长期稳定运行,国家从整体利益出发制定政策规划也是非常重要的。 相似文献
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Stefano Carletta Mauro Pontani Paolo Teofilatto 《International Journal of Satellite Communications and Networking》2024,42(2):134-164
Recent space projects are designed by satellite constellations with a large number of spacecraft, a global character (i.e., from equatorial to high inclination orbits), and the possibility to transfer information to different satellites of the constellation (inter satellite link) in order to deliver the information to the ground as soon as possible. To cope with a large number of parameters, a fast tool for constellation design, performance evaluation and networking strategies is needed. The aim of this paper is to obtain the performance of any constellation in less than 1 s, even when the number of satellites in the constellation and the duration of the analysis is large (e.g., more than 200 satellites in a period of some days). The proposed algorithm is based on analytical formulae obtained by using the stereographic projection on the equatorial plane of the satellite orbits and the projection of the target and ground station orbits. It is believed that the two-dimensional projection proposed here can offer some advantages with respect to the spatial analysis of satellite orbits and their ground tracks, such as the reduction in time required to calculate station/satellite and satellite/satellite encounter conditions, and the clear and simple representation of the motion of the satellite of the constellation and of the ground stations of interest. 相似文献
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