Mapping the radio sky with an interferometric network of low‐frequency radio receivers
Mapping the radio sky with an interferometric network of low‐frequency radio receivers
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使用低频无线电接收器的干涉网络绘制无线电天空图
DOI：
10.1002/jgrd.50671
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发表时间：
2013
期刊：
影响因子：
--
通讯作者：
M. Füllekrug
中科院分区：
文献类型：
--
作者：
A. Mezentsev;M. Füllekrug
100 kHz无线电天空的结构是由分布在101 × 1 km 2和1010 × 10 km 2局部区域的10台无线电接收机组成的两个干涉测量网络确定的。无线电波以小的时间差到达各个接收器对，该时间差用于确定电磁波的到达方向，包括方位角和仰角。结果表明，100 kHz的无线电波能量的主要部分来自地平线上的方位，这是一致的远程导航（LORAN）发射机的已知位置。无线电波能量的一部分以与LORAN传输的第一和第二天空跳跃波一致的仰角从天空到达。100 kHz无线电波能量的一小部分来自距离达1000公里的闪电放电，其方位与英国气象局到达时差（ATD）闪电检测网络报告的闪电位置一致。绘制无线电天空的角分辨率取决于网络的几何形状、仪器的定时精度和无线电波的信噪比。本研究中使用的干涉测量网络的角分辨率在零仰角方向上为0.1 °，在仰角方向上为几度。
The structure of the 100 kHz radio sky is determined with two interferometric networks of 10 radio receivers which are distributed over local areas of ∼1 × 1 km2 and ∼10 × 10 km2. The radio waves arrive at individual receiver pairs with small time differences which are used to determine the arrival direction of the electromagnetic waves including both the bearing and the elevation angle. The results show that the major part of the 100 kHz radio wave energy comes from the horizon at bearings which are consistent with known locations of Long Range Navigation (LORAN) transmitters. Some part of the radio wave energy arrives from the sky at elevation angles which are consistent with the first and second sky hop waves of LORAN transmissions. A minor part of the 100 kHz radio wave energy comes from lightning discharges at distances up to ∼1000 km with bearings which are consistent with lightning locations reported by the arrival time difference (ATD) lightning detection network of the UK Met Office. The angular resolution for mapping the radio sky depends on the network geometry, the instrumental timing accuracy, and on the signal‐to‐noise ratio of the radio waves. The resulting angular resolution of the interferometric networks used in this study is ∼1° in bearing at zero elevation and several degrees in elevation.
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影响因子：
4.6
作者：
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通讯作者：
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影响因子：
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DOI：
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发表时间：
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期刊：
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影响因子：
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作者：
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影响因子：
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作者：
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通讯作者：
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