寻找技术签名中错失的机会
Opportunity Lost in Searching for Technosignatures
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中文总结 AI 辅助
本研究提出“错失机会”、“体积损失”和“自我审查”三个概念，量化轨道射频干扰对地球技术签名搜索的影响，并主张利用月球背面等射电静默环境以恢复无歧义搜索能力。
中文摘要 AI 辅助
在过去五十年里，射电技术签名搜索的灵敏度显著提升；然而，随着开展这些搜索的射频干扰（RFI）环境日益受到污染，我们在望远镜灵敏度方面的进步并未必然带来更少歧义的技术签名搜索。在本研究中，我们探讨了由此导致的地球上进行无歧义技术签名搜索机会的丧失。我们引入了三个新概念，即“错失机会”、“体积损失”和“自我审查”，用以量化轨道射频干扰源对地球技术签名搜索的影响。利用2008年至2025年间公开可用的轨道数据，我们发现代表性望远镜波束内卫星的空间占用率大约增加了一倍，且损失的具体幅度强烈依赖于望远镜指向。我们进一步证明，多颗卫星微弱发射的累积效应会提高有效系统温度，从而减少给定固有功率技术签名可被探测的体积。利用默奇森宽场阵列（MWA）在2014年至2024年间约10,000次档案观测，我们发现了MWA观测的大多数频率上射频干扰占用率增加的暗示性证据。尽管存在其他进行地球技术签名搜索的机会，我们主张保护并利用如月球背面等独特射电静默环境，这为恢复在地球上正逐渐丧失的进行无歧义技术签名搜索的能力提供了机会。
英文摘要
The sensitivity of radio technosignature searches has improved dramatically over the last five decades; however, as the RFI environment from which these searches are conducted has become increasingly polluted, our advancements in telescope sensitivity have not necessarily been complemented by less ambiguous technosignature searches. In this work, we investigate the resulting loss of opportunity to conduct unambiguous technosignature searches from Earth. We introduce three new concepts, \textsf{opportunity lost}, \textsf{volume lost}, and \textsf{self-censorship}, to quantify the impact of orbiting RFI sources on Earth-based technosignature searches. Using publicly available orbital data between 2008 and 2025, we find an approximately two-fold increase in the spatial occupancy of satellites within representative telescope beams, with the exact magnitude of the loss strongly dependent on telescope pointing. We further demonstrate that the cumulative effect of faint emission from multiple satellites increase the effective system temperature and consequently reduce the volume over which a technosignature of a given intrinsic power can be detected. Using approximately 10,000 archival observations from the Murchison Widefield Array spanning 2014--2024, we find suggestive evidence for increasing RFI occupancy across most of the frequencies observed by the MWA. While other opportunities for terrestrial technosignature searches exist, we argue for the protection and utilisation of uniquely radio-quiet environments such as the lunar farside, which offers an opportunity to regain the ability to perform unambiguous technosignature searches that is being progressively lost on Earth.
发表机构
- University of Oxford（牛津大学）
- International Centre for Radio Astronomy Research – Curtin University（国际射电天文研究中心——科廷大学）
- SETI Institute（SETI研究所）
- Netherlands Institute for Radio Astronomy (ASTRON)（荷兰射电天文研究所（ASTRON））
- School of Physics, Trinity College Dublin（都柏林三一学院物理系）
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