由ITU-R VSAT辐射图引导的卫星系统中可重构智能表面（RIS）集成研究
Investigation of RIS Integration in Satellite Systems Guided by ITU-R VSAT Radiation Diagram
AI总结：
本文针对卫星-VSAT下行链路中RIS集成的缺口，提出基于天线辐射方向图与系统拓扑的RIS位置方向优化方法，利用菲涅尔区缓解双重衰落，完善信道方程，1m直径VSAT在S、C波段增益最高达9dB、14dB。
摘要：
可重构智能表面（RIS）技术的引入标志着现代通信系统进入变革时代，可增强覆盖范围并提升数据传输速率。尽管近期研究已探讨将RIS集成到卫星网络中，但在卫星-甚小口径终端（VSAT）下行链路中，尤其是放大VSAT侧贡献方面，仍存在关键且实用的实施缺口。本文针对该缺口，提出一种简单且工程化的RIS位置与方向优化方法，结合天线辐射方向图与系统拓扑以简化优化变量。本文主要目标是无需有源元件，通过利用RIS的菲涅尔区缓解反射链路的双重衰落约束。功率改善比取决于频率和VSAT的直径。结果表明，直径1m的VSAT在2GHz（S波段）时增益可达9dB，在4GHz（C波段）时增益可达14dB。此外，本文完善了RIS信道方程，纳入对流层衰减并考虑电磁波极化。
英文摘要：
The introduction of Reconfigurable Intelligent Surfaces (RIS) technology marks a transformative era in modern communication systems, enhancing coverage and facilitating higher data transmission rates. While recent research has delved into the integration of RIS into satellite networks, a critical and practical gap persists concerning its implementation in the satellite-Very Small Aperture Terminal (VSAT) downlink, specifically amplifying contributions from the VSAT side. This paper addresses this gap by proposing a simple and engineering methodology to optimize RIS position and orientation, incorporating considerations for the antennas' radiation patterns and the system's topology to streamline optimization variables. The primary objective of this paper is to alleviate the double fading constraint in the reflect link without the need for active elements, achieved by leveraging the Fresnel zone of the RIS. The improvement power ratio depends on the frequency and the VSAT 's diameter. The results show that for a VSAT with diameter 1m the gain is up to 9dB at 2 GHz (S band) and up to 14dB at 4 GHz (C band). Additionally, the RIS channel equation is refined, encompassing the tropospheric attenuation and accounting for electromagnetic wave polarization.
机构、总结、中文摘要均由AI分析而来，可能存在错误，请以论文正文为准。
