A vhf frequency band cloud lightning detection and positioning system

Abstract

The invention discloses a VHF (very high frequency) frequency-range intracloud lightning detecting and positioning system, which comprises a central treatment station and a plurality of detection and treatment sub-stations arranged in different positions, wherein the detection and treatment sub-stations and the central treatment station are accessed into a public wide area network in a wired or wireless mode; and through the wide area network, on one hand, obtained intracloud lightning detection data is uploaded to the central treatment station by the detection and treatment sub-stations, andon the other hand, the working state of each detection and treatment sub-station is remotely monitored by the central treatment station. The system can be used for precisely estimating the incidence directions of lightning radiation signals of a plurality of simultaneously occurring lightning radiation sources or the same lightning radiation source arriving at the detection sub-stations through different propagation paths, the arriving time difference of the lightning signals between any two detection and treatment sub-stations is calculated at the central treatment station (TDOA estimation),and the spatial position of an intracloud lightning radiation source is determined by DOA and TDOA information.

Description

technical field [0001] The invention belongs to the research field of lightning monitoring and early warning technology, and relates to a VHF frequency band cloud lightning detection and positioning system. Background technique [0002] With the development and gradual maturity of phase interferometer technology, and the practical application needs of lightning meteorology and lightning disaster detection and forecasting, in the mid-1980s, the French company Vaisala launched a lightning detection and positioning system working in the VHF frequency band - SAFIR system, and gradually put it into use in many countries and regions in the world. my country also introduced three sets of SAFIR3000 systems at the beginning of this century and deployed them in Beijing, Shanghai and Wuhan respectively. The system can automatically, continuously and real-time monitor cloud lightning occurrence. Since the 1990s, with the development of GPS technology and signal processing technology, the...

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Problems solved by technology

[0004] So far, domestic lightning detection and positioning systems developed on the basis of broadband interferometers or narrowband interferometers have not focused on the collection, detection, direction of signal arrival, and signal arrival time difference estimation of large-scale cloud lightning signals. Patents in link and complete system realization technology

At the same time, at present, the lightning detection and positioning systems that our country has really mastered and put into practical application are all aimed at low-frequency / very low-frequency ground lightning, and there is no observation and positioning system specifically for cloud lightning.

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