我们应该担心新兴的密集NGSO卫星星座的干扰吗?

C. Braun, Andra M. Voicu, L. Simić, P. Mähönen
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引用次数: 18

摘要

许多卫星运营商目前正计划部署非地球静止卫星轨道(NGSO)系统,用于Ku、Ka和v波段的宽带通信服务,其中一些已经开始发射。因此,由于干扰水平的增加和星座异质性导致的相互作用的复杂性,预计系统间卫星共存将面临新的挑战。这与ku波段尤其相关,因为ku波段的NGSO系统最为多样化,而现有的地球静止卫星轨道(GSO)系统通常支持关键业务,必须保护其免受干扰。因此,必须评估系统间相互干扰的影响、基本干扰缓解技术的效率,以及这些新系统是否需要监管干预。我们对ku波段的卫星间共存进行了广泛的研究,其中我们考虑了所有最近提出的NGSO和一些选定的GSO系统。我们的吞吐量退化结果表明,现有的频谱规则可能不足以确保GSO免受NGSO干扰,特别是由于低地球轨道(LEO)开普勒卫星的高发射功率。这也导致对其他NGSO系统的强烈干扰,在这些系统中,传统的干扰缓解技术(如aside)可能表现不佳。具体来说,搁置对大星座是有益的,但对小星座是有害的。此外,我们确认卫星运营商之间的频带分裂会显著降低吞吐量,对于ku波段也是如此。我们的研究结果总体上表明,新的NGSO系统的卫星间相互作用的复杂性太高,无法通过简单的干扰缓解技术来管理。这意味着需要更复杂的工程解决方案,甚至可能需要更严格的监管要求,以确保在新兴的、密集的NGSO部署中共存。
本文章由计算机程序翻译,如有差异,请以英文原文为准。
Should We Worry About Interference in Emerging Dense NGSO Satellite Constellations?
Many satellite operators are currently planning to deploy non-geostationary-satellite orbit (NGSO) systems for broadband communication services in the Ku-, Ka-, and V-band, where some of them have already started launching. Consequently, new challenges are expected for inter-system satellite coexistence due to the increase in the interference level and the complexity of the interactions resulting from the heterogeneity of the constellations. This is especially relevant for the Ku-band, where the NGSO systems are most diverse and existing geostationary-satellite orbit (GSO) systems, which often support critical services, must be protected from interference. It is thus imperative to evaluate the impact of mutual inter-system interference, the efficiency of the basic interference mitigation techniques, and whether regulatory intervention is needed for these new systems. We conduct an extensive study of inter-satellite coexistence in the Ku-band, where we consider all recently proposed NGSO and some selected GSO systems. Our throughput degradation results suggest that existing spectrum regulation may be insufficient to ensure GSO protection from NGSO interference, especially due to the high transmit power of the low Earth orbit (LEO) Kepler satellites. This also results in strong interference towards other NGSO systems, where traditional interference mitigation techniques like took-aside may perform poorly. Specifically, took-aside can be beneficial for large constellations, but detrimental for small constellations. Furthermore, we confirm that band-splitting among satellite operators significantly degrades throughput, also for the Ku-band. Our results overall show that the complexity of the inter-satellite interactions for new NGSO systems is too high to be managed via simple interference mitigation techniques. This means that more sophisticated engineering solutions, and potentially even more strict regulatory requirements, will be needed to ensure coexistence in emerging, dense NGSO deployments.
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