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Method and system for identifying zero-degree layer bright band

An identification method and identification system technology, applied in the field of identification method and system of zero-degree bright band

Inactive Publication Date: 2019-05-31
北京城市气象研究院
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Problems solved by technology

At present, the bright band identification algorithms of polarization radars (including S, C, and X bands) in my country all use the reflectivity factor to identify, and have not used the polarization parameters to identify bright bands in the zero-degree layer.

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  • Method and system for identifying zero-degree layer bright band
  • Method and system for identifying zero-degree layer bright band
  • Method and system for identifying zero-degree layer bright band

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Embodiment Construction

[0045] In order to make the purpose, technical solutions and advantages of the present invention clearer, the present invention will be further described in detail below in conjunction with specific embodiments and with reference to the accompanying drawings. It should be understood that these descriptions are exemplary only, and are not intended to limit the scope of the present invention. Also, in the following description, descriptions of well-known structures and techniques are omitted to avoid unnecessarily obscuring the concept of the present invention.

[0046] for figure 1 For the prior art shown, the defects of the zero-degree layer bright band identification based on the reflectivity factor Z profile are: (1) by finding the height h with the largest average reflectivity factor max , increasing several hundred meters upwards to obtain the zero-degree top height h t , down several hundreds of meters to get the bottom height h of the zero-degree layer b , the zero-de...

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Abstract

A method and system for identifying a zero-degree layer bright band. The method comprises the steps of: acquiring observation data of polarization radar, the observation data at least including a reflectance, a differential reflectance and a correlation coefficient; separating the observation data into bright band region data and non-bright band area data; respectively calculating the probabilitydensity function distribution of the reflectance, the differential reflectance and the correlation coefficients of the bright band area data and the non-bright band area data; based on the probabilitydensity function distribution of the reflectance, the differential reflectance and the correlation coefficients of the bright band area data and the non-bright band area data, calculating and obtaining the probability of the observation data belonging to the bright band area data, and the probability of the observation data belonging to the non-bright band area data; if the probability of the observation data belonging to the bright band area data is larger than the probability of the observation data belonging to the non-bright band area data, considering the observation data belonging to the non-bright band area data. Therefore, the identification accuracy of the zero-degree layer can be improved.

Description

technical field [0001] The invention belongs to the field of radar detection, and in particular relates to a method and system for identifying bright bands in the zero-degree layer. Background technique [0002] The "zero-degree bright band" has an important impact on weather radar precipitation estimation and precipitation particle phase identification. Below the band, the particles melt into raindrops, the falling speed increases, the particle concentration decreases, and the reflectivity decreases. The height and thickness of the 0°C layer can be estimated according to the bright band of the zero-degree layer observed by radar. Weather radars usually observe a "zero-degree bright band" during stratiform or cumulostratus precipitation weather. [0003] Polarization Doppler weather radar (hereinafter referred to as polarization radar) is an upgraded version of the new generation of Doppler weather radar (hereinafter referred to as Doppler radar) deployed nationwide. Pola...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01S13/95
CPCY02A90/10
Inventor 马建立胡志群仰美霖李思腾陈明轩吴剑坤秦睿
Owner 北京城市气象研究院
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