McGill北极研究站的射频干扰
Radio-Frequency Interference at the McGill Arctic Research Station
摘要：
红移21厘米观测的感兴趣的频率受到地面射频干扰（RFI）的严重影响。我们确定麦吉尔北极研究站（MARS）作为一个新的射频干扰安静的网站，并报告其射频干扰占用使用122小时的数据与原型天线站开发的阵列的长基线天线从次南极进行无线电观测。使用一个RFI标记过程中定制的MARS数据，我们发现一个整体的RFI占用率为1.8%，平均超过20-125 MHz。特别地，发现FM广播频带（88-108 MHz）具有至多1.6%的RFI占用率。这些数据是在北极夏季采集的，当时电离层条件退化，研究基地活跃，导致RFI增加。因此，此处引用的结果代表火星大气研究所的最高水平射频干扰环境。
英文摘要：
The frequencies of interest for redshifted 21 cm observations are heavily affected by terrestrial radio-frequency interference (RFI). We identify the McGill Arctic Research Station (MARS) as a new RFI-quiet site and report its RFI occupancy using 122 hours of data taken with a prototype antenna station developed for the Array of Long-Baseline Antennas for Taking Radio Observations from the Sub-Antarctic. Using an RFI flagging process tailored to the MARS data, we find an overall RFI occupancy of 1.8% averaged over 20-125 MHz. In particular, the FM broadcast band (88-108 MHz) is found to have an RFI occupancy of at most 1.6%. The data were taken during the Arctic summer, when degraded ionospheric conditions and an active research base contributed to increased RFI. The results quoted here therefore represent the maximum-level RFI environment at MARS.
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