High-precision 3D lightning location method based on hierarchical search and distance-space projection

Abstract

The invention discloses a high-precision lightning three-dimensional positioning method based on layered search and distance space projection. The method adopts a layered search strategy from coarse to fine, and reduces the search step size and search range layer by layer to realize fast lightning detection. Positioning: use the distance space projection algorithm to map the geographical space into the distance space, project the lightning radiation electric field value received by the observatory into the distance space, extract the lightning position from the distance space projection matrix, and use the characteristic of constant distance space resolution, It overcomes the shortcoming of space variation in geographic space and realizes high-precision three-dimensional positioning of lightning.

Description

technical field [0001] The invention belongs to the technical field of lightning location, and more specifically relates to a high-precision lightning three-dimensional location method based on hierarchical search and distance space projection. Background technique [0002] Lightning is a kind of strong discharge phenomenon that occurs during convective weather, and is one of the most common disastrous weather phenomena in nature. With the wide application of microelectronics and electrical equipment, the direct and indirect disasters caused by lightning are becoming more and more serious. Therefore, the detection and early warning of lightning has become one of the tasks to be solved urgently. [0003] The three-dimensional lightning positioning technology can not only monitor the ground lightning well, but also observe the development process of early lightning electromagnetic radiation such as cloud flashing, and provide key information for the study of the development me...

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Problems solved by technology

There are two shortcomings in this method: first, the selected fitness function only uses time information, and discards the electric field value excited by the lightning radiation electric field measured by the observatory; The distance from the unit to the lightning detection network is different. The closer the grid unit is to the detection network, the higher the resolution, and the farther away from the detection network, the lower the resolution. This means: under the same step division, if the grid unit is closer to the detection network If the size of the grid unit meets the positioning accuracy requirements, in the area far away from the detection network, due to the reduction of resolution, multiple grid units represent the same geographic location, resulting in non-uniqueness of the geospatial location

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