Broadband VHF sources locating system using arrival-time differences for mapping of lightning discharge process

Details Broadband VHF sources locating system using arrival-time differences for mapping of lightning discharge process Broadband VHF sources locating system using arrival-time differences for mapping of lightning discharge process

Jul 2005

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2005jastp..67.1031t&link_type=abstract

Journal of Atmospheric and Solar-Terrestrial Physics, Volume 67, Issue 11, p. 1031-1039.

Physics

Scientific paper

This paper presents a three-dimensional lightning discharge mapping system using arrival-time difference of broadband VHF electromagnetic pulses (20 200 MHz) methodology. The system consists of four circular plate antennas; three of which are placed to form two perpendicularly crossed-short base lines, with the fourth located at some distance. The directions of the electromagnetic radiation sources are determined using perpendicularly aligned antennas whereas the 3-D positions are obtained using all the four antennas. Broadband pulses arrival time differences are estimated incorporating time-domain signal analysis and the least-squares error method is applied to the detected broadband pulses to estimate the time delay with the quadratic interpolation technique utilized to achieve the resolution less than 1 ns. In this paper, the implementation of the system along with the successful reconstruction of the lightning discharge progression in 2-D and 3-D space is described. Additionally, instances of observation results of the cloud-to-ground and ground-to-cloud lightning discharge have been presented.

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