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首页> 外文会议>IEEE International Conference on Humanoid, Nanotechnology, Information Technology, Communication and Control, Environment and Management >Development of a Microcomputer-Based Data Acquisition System for the SuperSID Monitor in the Philippines
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Development of a Microcomputer-Based Data Acquisition System for the SuperSID Monitor in the Philippines

机译：开发菲律宾中超大监视器的基于微型计算机的数据采集系统

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The study of the changes in the behaviour of the Ionosphere is of great importance due to its influence on radio propagations. Stanford University's SuperSID monitor is used to study these changes by tracking the strength of very low frequency signals over time. The purpose of this research is to setup a SuperSID monitor in Manila, Philippines using a microcomputer as the main computing device. The Data Acquisition (DAQ) system includes a loop antenna, a preamplifier, a USB sound card, and a Raspberry Pi microcomputer. The system output is a SID data graph which is a plot of the relative VLF signal strength over time from NWC (19.8 kHz) and NDT (22.2 kHz) VLF transmitters. Pattern for the VLF signal strength during daytime was distinguished as more stable, compared to the fluctuations during night time. Also, the sunrise and sunset signatures were observed from the graph and were characterized as a gradual decay on VLF signal strength and as a sudden drop on VLF signal strength, respectively. To validate the signatures, it was compared to the actual civil twilight terminators over the monitor, the transmitter, and the midpoint or the center of minimum distance between the monitor (MIT-PH) and the transmitter. Based from the results, the minimum signal strengths from the SID graph correspond closely to the time when the civil twilight ends or starts over the midpoint of the monitor-transmitter pair.
机译：由于其对无线电繁殖的影响，对电离层行为的变化的研究具有重要意义。斯坦福大学的超级监视器用于通过跟踪超低频率信号随时间的强度来研究这些变化。本研究的目的是使用菲律宾的Manila在Manila的SupersID监视器使用微电脑作为主要计算设备。数据采集​​（DAQ）系统包括环天线，前导码，USB声卡和覆盆子PI微型计算机。系统输出是SID数据图，其是来自NWC（19.8 kHz）和NDT（22.2kHz）VLF发射机的相对VLF信号强度的曲线图。与夜间的波动相比，白天在白天的VLF信号强度的图案变得更加稳定。此外，从图中观察到日出和日落签名，并分别表征为VLF信号强度的逐渐衰减，分别是VLF信号强度的突然下降。为了验证签名，将它与监视器，发射器和中点或监视器（MIT-PH）和发射器之间的最小距离的实际文明斜终点进行比较。基于结果，来自SID图的最小信号强度与文明暮色结束或从监视器 - 发射器对的中点开始的时间相对应。

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