Imaging Lightning Progression Using VHF Broadband Radio Interferometry

Redy MARDIANA  Takeshi MORIMOTO  Zen-Ichiro KAWASAKI  

Publication
IEICE TRANSACTIONS on Electronics   Vol.E84-C   No.12   pp.1892-1899
Publication Date: 2001/12/01
Online ISSN: 
DOI: 
Print ISSN: 0916-8516
Type of Manuscript: Special Section PAPER (Special Issue on New Technologies in Signal Processing for Electromagnetic-wave Sensing and Imaging)
Category: 
Keyword: 
interferometry,  broadband interferometry,  lightning,  electromagnetic wave,  remote sensing,  

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Summary: 
The VHF broadband radio interferometry operated from 25 MHz to 250 MHz has been developed for observing lightning discharge progression. The lightning images are derived by sensing the electromagnetic-waves which are radiated during the discharges. The perpendicular baseline geometry provides the angular locations (azimuth and elevation) of lightning radiation sources. The lightning observations have been conducted in the Hokuriku District in 1999. The station consisted of three broadband antennas and an electric field antenna as well as a GPS receiver. The system was able to reconstruct lightning discharge channels in two-spatial dimensions and in time sequence. As one of the observation results, an upward negative cloud-to-ground lightning flash will be presented.