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A method and system for identifying bright bands in the zero-degree layer

An identification method and bright band technology, applied in the field of radar detection, can solve problems such as failure and low accuracy

Inactive Publication Date: 2021-03-02
北京城市气象研究院
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Problems solved by technology

There is a problem with this method: only one radar observation parameter of reflectivity Z is used to identify the bright band, and the accuracy is low. When the reflectivity of the zero-degree layer observed by the radar is close to the reflectivity above and below the zero-degree layer, the method will fail.
At present, the bright band identification algorithms of polarization radar (including S, C, and X bands) in my country all use the reflectivity factor to identify, and have not used the polarization parameters to carry out the identification of the zero-degree bright band

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[0045] In order to make the object, technical solution and advantages of the present invention clearer, the present invention will be further described in detail below in combination 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 , add a few hundred meters upward to get 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-degree layer thic...

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Abstract

A method and system for identifying bright bands in the zero-degree layer, wherein the method includes: obtaining observation data of polarized radar, the observation data at least including reflectivity, differential reflectivity and correlation coefficient; separating the observation data into bright band area data and non- Bright band area data; calculate the probability density function distribution of reflectance, differential reflectance and correlation coefficient of bright band area data and non-bright band area data respectively; based on bright band area data and non-bright band area data reflectance, differential reflectance Probability density function distribution of the rate and correlation coefficient, respectively calculate the probability that the observed data belongs to the data of the bright band area, and the probability of the data belonging to the non-bright band area; if the probability of the observed data belonging to the data of the bright band area is greater than The probability of the data, it is considered that the observation data belongs to the data of the bright band area. Therefore, the recognition 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. According to the bright band of the zero-degree layer observed by radar, the height and thickness of the 0°C layer can be estimated. Weather radar usually observes the "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. P...

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Application Information

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Patent Type & Authority Patents(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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