Selection of radio astronomical observation sites and its dependence on human generated RFI
Selection of radio astronomical observation sites and its dependence on human generated RFI
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射电天文观测地点的选择及其对人类产生的射频干扰的依赖
DOI：
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发表时间：
2014
期刊：
影响因子：
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通讯作者：
N. Noorazlan
中科院分区：
文献类型：
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作者：
Roslan Umar;Z. Abidin;Z. A. Ibrahim;Z. Rosli;N. Noorazlan
我们研究了人口密度对影响射电天文学的射频干扰的影响。我们使用一种新的方法来量化种群密度阈值，以确定无线电静默区(RQZ)选址的最合适下限。我们发现，在人口密度-RFI图中有一个特定的趋势，在较低的值时迅速增加，而在较高的值时减慢到几乎持平。我们利用这一趋势来确定产生RFI的人口密度阈值。利用这一方法，我们发现，对于2.8GHz以下的频率，影响射电天文的低、中、高人口密度分别在150ppl km−2以下、150ppl km−2到5125ppl km−2之间和5125ppl km−2以上。我们还在三个天文窗口，即氢线、氢线和氢线上研究了人口密度对RFI环境的影响。我们发现，人口密度的多项式拟合产生了类似的趋势，给出了人口密度影响的类似阈值。然后，我们将我们的干扰值与国际电信联盟在这些天文窗口内使用的标准阈值水平进行比较。
We investigate the influence of population density on radio-frequency interference (RFI) affecting radio astronomy. We use a new method to quantify the threshold of population density in order to determine the most suitable lower limit for site selection of a radio quiet zone (RQZ). We found that there is a certain trend in the population density-RFI graph that increases rapidly at lower values and slows down to almost flat at higher values. We use this trend to identify the thresholds for population density that produce RFI. Using this method we found that, for frequencies up to 2.8 GHz, low, medium and high population densities affecting radio astronomy are below 150 ppl km−2, between 150 ppl km−2 and 5125 ppl km−2, and above 5125 ppl km−2 respectively. We also investigate the effect of population density on the environment of RFI in three astronomical windows, namely the deuterium, hydrogen and hydroxyl lines. We find that a polynomial fitting to the population density produces a similar trend, giving similar thresholds for the effect of population density. We then compare our interference values to the standard threshold levels used by the International Telecommunication Union within these astronomical windows.