CALIBRATION OF THE VHF LIGHTNING INTERFEROMETER TRIGGERING UNIT USING A LIGHTNING CURRENT GENERATOR

Result code in IS VaVaI

<a href="https://www.isvavai.cz/riv?ss=detail&h=RIV%2F68407700%3A21230%2F19%3A00333135" target="_blank" >RIV/68407700:21230/19:00333135 - isvavai.cz</a>

Result on the web

—

DOI - Digital Object Identifier

—

Result language

angličtina

Original language name

CALIBRATION OF THE VHF LIGHTNING INTERFEROMETER TRIGGERING UNIT USING A LIGHTNING CURRENT GENERATOR

Original language description

VHF interferometer serves for the registration and localization of lightning radio pulses for further analyses of the inter-cloud processes that are connected with charge transfer and emission of radio pulses. As the bandwidth, of the VHF interferometer, is very wide due to the precise measurement of the time difference of arrival, the interferometer generates a large volume of data that must be processed and stored. The triggering system of the VHF lightning interferometer enables to select scientifically valuable data from the data stream. The ideal triggering unit synchronizes data acquisition with the return stroke event. The basic requirements placed on the triggering circuits are a low false alarm rate and a high probability of lightning discharge detection. The unit consists of a whip antenna that is sensitive in the electrical field, an amplifier and a matched filter that is tuned to the return stroke wave. The usage of the correctly designed matched filter increases detection probability of the lightning discharge and reduces false alarm rate. The key problem is laboratory testing of the triggering unit in a near-realistic environment. The paper proposes a method based on the generation of the return stroke wave by a lightning current generator. As the gain of the common electrically short whip antenna cannot be determined with sufficient precision, the electric field of the generator is properly calibrated by an electromagnetic field probe based on a plate radiator. This approach facilitates accurate control of the amplitude of the return stroke radio wave and study of the sensitivity of the triggering circuits on nonstandard waves.

Czech name

—

Czech description

—

Type

O - Miscellaneous

CEP classification

—

OECD FORD branch

20201 - Electrical and electronic engineering

Project

<a href="/en/project/EF15_003%2F0000481" target="_blank" >EF15_003/0000481: Research Center of Cosmic Rays and Radiation Events in the Atmosphere</a><br>

Continuities

P - Projekt vyzkumu a vyvoje financovany z verejnych zdroju (s odkazem do CEP)

Publication year

2019

Confidentiality

S - Úplné a pravdivé údaje o projektu nepodléhají ochraně podle zvláštních právních předpisů