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Lightning VHF radiation location system based on short-baseline TDOA technique — Validation in rocket-triggered lightning

发布人:news  |  来自:本站  |  发布时间:2013-05-26 22:47:03  |  点击次数:2047
Keywords: Short-baseline Time-difference of arrival VHF radiation Discharge process Rocket-triggered 
                        lightning


全文下载http://lageo.iap.ac.cn/uploads/130527065331lumhcu33a72f.pdf


AbstractA lightning VHF radiation location system based on short-baseline time-difference of arrival (TDOA) technology is newly developed. Based on the orthogonal 10 m-baseline antenna array
with four identical broadband flat plane antennas, this system receives the lightning broadband
VHF radiation signals and calculates TDOA between antennas in order to determine the location of
lightning radiation sources in two dimensions (elevation and azimuth). To reduce noise and
improve estimation accuracy of time delay, a general correlation time delay estimation algorithm
based on direct correlation method and wavelet transform is proposed. Moreover, parabolic
interpolation algorithmis used in the fractional delay estimation to improve the time resolution of
the positioning system. In this paper, a rocket-triggered lightning discharge and a cloud lightning
discharge are analyzed respectively, combining with simultaneous observations of high-speed
camera and fast/slow electric field changes. The results indicate that the TDOA location system
could effectively map the lightning radiation sources in 2 dimensions and are in a good agreement
with the high-speed video camera images.

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