User Datagram and Bundle Protocol for Distributed Small Satellite Topologies
User Datagram and Bundle Protocol for Distributed Small Satellite Topologies
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2013
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通讯作者：
Paul Muri;J. Mcnair;Joseph Antoon;A. Gordon-Ross;Kathryn Cason;N. Fitz-Coy
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作者：
Paul Muri;J. Mcnair;Joseph Antoon;A. Gordon-Ross;Kathryn Cason;N. Fitz-Coy
许多计划中的地球观测卫星任务在星座或群集轨道上使用分布式卫星系统，而不是一颗带有许多仪器的大型卫星。这个由卫星和地面站组成的网络使数据能够有效地下行。然而，要为小型地球观测卫星星座创建网络协议，需要解决几个限制，包括分布式拓扑管理、慢速下行数据速率和单点对点通信。由于分布式卫星星座加剧了这些限制的严重性，因此需要对星座的网络性能进行彻底分析，以确保任务目标的实现。在本文中，我们比较了使用延迟容忍网络协议和用户数据报协议（UDP）的低地球轨道（LEO）地球观测卫星星座。星座的卫星间链路和下行链路使用诸如访问窗口时间、下降速率和吞吐量等网络指标进行评估。我们使用network simulator 3 （ns-3）模拟这些网络指标。以前的工作已经提出了用于地球观测的卫星星座，但是，没有对5颗小卫星的星座进行网络指标分析。结果表明，具有重复地面轨迹的太阳同步星座在增加访问时间、降低落差率和提高吞吐量方面优于花朵星座。仿真还确定了远程卫星链路的最佳接入控制时隙时间和分组传输间隔。此外，我们能够通过添加具有延迟容忍网络协议实现的节点来比较UDP和富足协议的吞吐量性能。
Many planned Earth observation satellite missions use distributed satellite systems in constellation or cluster orbits instead of one, large satellite with many instru ments. This network of satellites and ground stations allows data to be efficiently downlin ked. Ho wever, to create a netwo rking protocol for constellations of small Earth observing satellites , several limitations need to be addressed, including distributed topology management, slow downlin k data-rates, and single point-to-point communication. Since distributed satellite constellations exacerbate the severity of these limitations, a thorough analysis of a constellation's network performance is required to ensure that task objectives are achievable. In this paper, we co mpared low Earth orbit (LEO) Earth observing satellite constellations using delay tolerant networking protocols and the user datagram p rotocol (UDP). The constellations' inter-satellite lin ks and downlin ks were evaluated using network metrics such as access window time, drop-rat io, and throughput. We simu lated these network metrics using the Network Simu lator 3 (ns-3). Prev ious works have proposed satellite constellations for Earth observation, however, constellations of s mall satellites have not been analy zed for network metrics. Results show that a sun-synchronous constellation with a repeating ground track outperforms a flo wer constellation with respect to increased access time, reduced drop-ratio, and higher throughput. The simulat ions also determined the optimu m med ia access control slot time and packet transmission intervals for long distance satellite links. Additionally, we were able to co mpare the throughput performance of UDP to abundle protocol by adding nodes with delay tolerant networking protocol imp lementations.