Sky Radio Quiet Zones for Mitigating RFI From Large-Scale NGSO Satellites to Ground Radio Astronomy System
Sky Radio Quiet Zones for Mitigating RFI From Large-Scale NGSO Satellites to Ground Radio Astronomy System
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DOI：
10.1109/access.2023.3308294
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发表时间：
2023
期刊：
影响因子：
3.9
通讯作者：
H. Minn;Zhixuan Fan
中科院分区：
文献类型：
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作者：
H. Minn;Zhixuan Fan
拥有数千颗卫星的大规模非地球静止轨道卫星通信系统（NGSO SatCom）对地面射电天文系统（RAS）的射频干扰（RFI）提出了严重的问题。随着卫星通信行业迅速扩大通信卫星的数量，增加了RFI，而RAS也在提高射电天文观测（RAO）能力，需要更好地保护免受RFI，这种情况变得更加严重。为了解决这个即将到来的RFI问题，我们分析了相应的RFI，以确定占主导地位的RFI贡献者，然后提出了两种类型的天空无线电静区（SRQZ），即，望远镜为中心（TC）-SRQZ和RAO方向为中心（DC）-SRQZ。我们调查峰值RFI和平均RFI抑制特性的两个SRQZ类型单独单独和联合应用时。我们评估RFI特性与/不SRQZ几个代表性的地面RAS接收机位置下的低地球轨道卫星通信系统以及中地球轨道卫星通信系统。我们提出并讨论了广泛的RFI性能结果及其对RFI方案的具体依赖。这些结果表明，适当设计的SRQZ提供了显着的RFI抑制。我们还提供SRQZ类型/部署的选择、相关参数设置和实际实施方面的指导。
Emerging large-scale non-geostationary orbit (NGSO) satellite communication (SatCom) systems with more than thousands of satellites raise a serious concern of radio frequency interference (RFI) to the ground-based radio astronomy system (RAS). This situation becomes more serious as the SatCom industry is rapidly expanding the number of communication satellites which increases RFI, while the RAS is also advancing with enhanced radio astronomical observation (RAO) capability requiring better protection against RFI. To address this impending RFI issue, we analyze the corresponding RFI to identify dominant RFI contributors and then propose two types of sky radio quiet zone (SRQZ), namely, telescope-centered (TC)-SRQZ and RAO direction-centered (DC)-SRQZ. We investigate peak RFI and average RFI suppression characteristics of the two SRQZ types when applied individually alone and jointly. We evaluate the RFI characteristics with/without SRQZs for a few representative ground RAS receiver locations under a low earth orbit SatCom system as well as a medium earth orbit SatCom system. We present and discuss extensive RFI performance results and their dependency on the specifics of the RFI scenarios. These results show that appropriately designed SRQZs provide significant RFI suppression. We also offer guidance on the choice of SRQZ type/deployment, related parameter settings, and practical implementation aspects.