大气吸收和散射对光学卫星-地面链路的影响

IF 0.9 4区 计算机科学 Q3 ENGINEERING, AEROSPACE
Dirk Giggenbach, Amita Shrestha
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引用次数: 6

摘要

卫星间或卫星对地通信的自由空间射频(RF)通信链路越来越受到射频技术频谱可用性不足和数据速率有限的限制。随着用于全球通信覆盖的大型卫星超级星座网络的出现,传统射频通信的这一局限性变得更加严重。因此,在空间中建立点对点自由空间光链路技术(FSO)在未来的系统中将变得至关重要,其中应用将用于数据中继链路,或用于巨型星座卫星间链路,以及用于直接数据下行链路,或从深空探测器到地面。除了频谱可用性之外,光学fso的进一步优势是其提高的功率效率、更高的数据速率、避免干扰和固有的防拦截保护。然而,当这些光通信链路必须穿过地球大气层时,衰减和散射效应确实会影响信号的传输。在这篇文章中,我们研究了大气衰减的影响,包括分子吸收以及气溶胶散射和吸收的影响,对于FSO使用的典型波长区域,取决于链路的几何形状。基于传输模拟数据库,我们给出了有用的光谱范围和它们的特定衰减强度。确定了依赖于大气质量和仰角的自由光谱传输窗口,以便在空间应用中可靠和有效地利用光传输技术。
本文章由计算机程序翻译,如有差异,请以英文原文为准。

Atmospheric absorption and scattering impact on optical satellite-ground links

Atmospheric absorption and scattering impact on optical satellite-ground links

Free-space radio-frequency (RF) communication links for intersatellite or satellite-to-ground communications are getting increasingly constraint by the insufficient spectrum availability and limited data rate of RF technology. With the advent of large satellite mega-constellation networks for global communications coverage, this limitation of classical RF communication becomes even more critical. Therefore, the establishment of point-to-point free-space optical link technology (FSO) in space will become of paramount importance in future systems, where the application will be for data-relays links, or for mega-constellations inter-satellite links, as well as for direct data downlinks, or from deep-space probes to ground. Further advantages of optical FSO—besides spectrum availability—is its increased power efficiency, higher data rates, avoidance of interference, and inherent protection against interception. When, however, these optical communication links have to pass through Earth's atmosphere, attenuation and scattering effects do influence the signal transmission. In this publication, we investigate the effects of atmospheric attenuation, including the effects of molecular absorption as well as aerosol scattering and absorption, for typical wavelength regions used for FSO, dependent on the link geometries. Based on transmission-simulation databases, we show useful spectral ranges and their specific attenuation strength. Free spectral transmission windows dependent on atmospheric quality and elevation angle are identified for reliable and efficient use of the optical transmission technology in space applications.

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来源期刊
CiteScore
4.10
自引率
5.90%
发文量
31
审稿时长
>12 weeks
期刊介绍: The journal covers all aspects of the theory, practice and operation of satellite systems and networks. Papers must address some aspect of satellite systems or their applications. Topics covered include: -Satellite communication and broadcast systems- Satellite navigation and positioning systems- Satellite networks and networking- Hybrid systems- Equipment-earth stations/terminals, payloads, launchers and components- Description of new systems, operations and trials- Planning and operations- Performance analysis- Interoperability- Propagation and interference- Enabling technologies-coding/modulation/signal processing, etc.- Mobile/Broadcast/Navigation/fixed services- Service provision, marketing, economics and business aspects- Standards and regulation- Network protocols
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