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首页> 外文期刊>Advances in space research >Study of long path VLF signal propagation characteristics as observed from Indian Antarctic station, Maitri
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Study of long path VLF signal propagation characteristics as observed from Indian Antarctic station, Maitri

机译：从印度南极麦特里站观测到的长途甚低频信号传播特性的研究

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摘要

To examine the quality and propagation characteristics of the Very Low Frequency (VLF) radio waves in a very long propagation path, Indian Centre for Space Physics, Kolkata, participated in the 27th Indian scientific expedition to Antarctica during 2007-2008. One Stanford University made AWESOME VLF receiving system was installed at the Indian Antarctic station Maitri and about five weeks of data were recorded successfully from the Indian transmitter VTX and several other transmitting stations worldwide. The quality of the signal from the VTX transmitter was found to be very good, consistent and highly stable in day and night. The signal shows the evidences of the presence of the 24 h solar radiation in the Antarctic region during local summer. Here we report the both narrow band and broadband VLF observations from this site. The diurnal variations of VTX signal (18.2 kHz) are presented systematically for Antarctica path and also compared the same with the variations for a short propagation path (VTX-Kolkata). We compute the spatial distribution of the VTX signal along the VTX-Antarctica path using the most well-known LWPC model for an all-day and all-night propagation conditions. The calculated signal amplitudes corresponding to those conditions relatively corroborate the observations. We also present the attenuation rate of the dominant waveguide modes corresponding to those propagation conditions where the effects of the Antarctic polar ice on the attenuation of different propagating waveguide modes are visible.
机译：为了研究超低频（VLF）无线电波在很长传播路径中的质量和传播特性，加尔各答印度空间物理中心在2007-2008年期间参加了第27届印度南极科学考察。在印度南极站Maitri安装了一个斯坦福大学制造的AWESOME VLF接收系统，并成功地从印度发射器VTX和全球其他几个发射站成功记录了大约五个星期的数据。发现来自VTX发射器的信号质量在白天和黑夜都非常好，一致且高度稳定。该信号显示了当地夏季在南极地区存在24小时太阳辐射的证据。在这里，我们报告了该站点的窄带和宽带VLF观测。系统地介绍了南极路径的VTX信号（18.2 kHz）的日变化，并将其与短传播路径（VTX-加尔各答）的变化进行了比较。我们使用最著名的LWPC模型，针对全天和整夜的传播条件，计算了沿VTX-南极路径的VTX信号的空间分布。对应于那些条件的计算信号幅度相对证实了观察结果。我们还给出了与那些传播条件相对应的主要波导模式的衰减率，其中南极极冰对不同传播波导模式的衰减的影响可见。

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  • 来源
    《Advances in space research》 |2014年第8期|1619-1628|共10页
  • 作者

    Sudipta Sasmal; Sujay Pal; Sandip K. Chakrabarti;

  • 作者单位

    Indian Centre for Space Physics, 43 Chalantika, Garia St. Road, Kolkata 700084, India;

    Indian Centre for Space Physics, 43 Chalantika, Garia St. Road, Kolkata 700084, India,University of Electro-Communication, 1-5-1 Chofugaoka, Chofu, Tokyo, Japan;

    Indian Centre for Space Physics, 43 Chalantika, Garia St. Road, Kolkata 700084, India,S.N. Bose National Centre for Basic Sciences, JD Block, Sector-Ⅲ, Salt Lake, Kolkata 700098, India;

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  • 原文格式 PDF
  • 正文语种 eng
  • 中图分类
  • 关键词

    Long path VLF propagation; Earth-ionosphere waveguide; D-region; Ionosphere;

    机译：长途VLF传播;地球电离层波导;D区;电离层;

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