Real-time lightning monitoring system and its applications for power and communications network control

实时雷电监测系统及其在电力和通信网络控制中的应用

基本信息

批准号：
16201034
负责人：
KAWASAKI Zenichiro
金额：
$ 26.71万
依托单位：
Osaka University
依托单位国家：
日本
项目类别：
Grant-in-Aid for Scientific Research (A)
财政年份：
2004
资助国家：
日本
起止时间：
2004 至 2006
项目状态：
已结题

项目摘要

This research is devoted to realize a real-time monitoring system for lightning activities in Kinki district. The principal equipments for the observations are VHF Broadband Digital Interferometer (DITF). DITF is a system to image precise lightning channels and monitor lightning activity widely. The feature of the system is its ultra-wide bandwidth (from 25MHz to 100MHz) and implicit redundancy for estimating VHF source location. Since it is known that VHF impulses are mainly radiated from the tip of breakdown, the locations for their sources are equivalent to imaging the lightning channel development. Moreover recent investigations suggest that locations of negative breakdown source may give us information on positive charge distribution inside thunderclouds as wellA single DITF site provides the VHF impulse source mapping in 2D, namely azimuth and elevation. It means that we are able to image lightning channels in 2D without any data communication with other observations sites. This … More is a one of significant advantages of the system to other techniques for EM radiation source localization. First, we actualize the real-time display of the 2D mapping on this advantage and increases in computing capability. Next, application software for DITF data processing have been developing with new algorithm to improve its accuracy. The development has focused on the removing process for interferometry known as "fringe ambiguity", quickness of data processing, and easily operations. In DITF, waveforms of VHF impulses less than size of on-board memory in 1 s are stored as one dataset. In other words the maximum number of VHF impulses is 2000 in the case of the experimental system and the maximum duration is 1 s for one dataset. It takes less than 1 s to apply the mapping process for one dataset. If we process the data for every data acquisition immediately, the 2D mapping is displayed in at most 1 s on theA data transmitting system of 3D localization data by 3-station-DITF-network through the Internet has been also actualized. 2D data are delivered to data processing center and they are coordinated automatically. The applications for power and communications network control remains an issue. Less

这项研究是为了实现Kinki地区的闪电活动的实时监控。宽带宽度（从25MHz到100MHz）和估计VHF源位置的隐式冗余。站点在2D中提供VHF脉冲映射，这意味着我们能够在2D中与观察站的数据通信图像。辐射源本地化。在DITF中，VHF脉冲的波形比在1 s的板上存储器的大小作为一个数据集存储在1 s中。对于一个数据集的映射过程。仍然是一个。