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Raininess estimation method based on dual polarization Doppler weather radar detection

A weather radar, dual linear polarization technology, applied in the field of rain intensity estimation based on dual linear polarization Doppler weather radar detection, can solve problems such as large differences, and achieve the effect of improving capabilities, advanced and reasonable algorithms, and improved accuracy

Inactive Publication Date: 2015-01-28
ANHUI SUN CREATE ELECTRONICS
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Problems solved by technology

Therefore, making full use of various measurement parameters of dual-linear polarization Doppler radar can effectively improve the estimation accuracy of precipitation. However, the methods of estimating precipitation intensity using different polarization parameters are very different.

Method used

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  • Raininess estimation method based on dual polarization Doppler weather radar detection
  • Raininess estimation method based on dual polarization Doppler weather radar detection
  • Raininess estimation method based on dual polarization Doppler weather radar detection

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Embodiment Construction

[0027] Such as figure 1 As shown in , a rain intensity estimation method based on dual linear polarization Doppler weather radar detection, the method includes:

[0028] (1) When the echo intensity Z of precipitation H When smaller, use the echo intensity Z H to estimate precipitation, namely:

[0029] R(Z H ) = a 1 Z H b1 (1)

[0030] Among them, R(Z H ) means echo intensity Z H Estimated rain intensity R, its unit is mm h -1 ; Z H is the echo intensity, and its unit is mm 6 m -3 ;a 1 , b 1 It is an adjustable parameter. For different bands and different rainfall types, the values ​​of each parameter are not exactly the same;

[0031] At this time, the shape of the raindrops is approximately spherical and isotropic, which is in line with the assumptions of the conventional radar to estimate the rain intensity; at the same time, because the Z DR and K DP If the value is small, it is easy to produce measurement error, use Z DR and K DP On the contrary...

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Abstract

The invention relates to a raininess estimation method based on dual polarization Doppler weather radar detection. The method comprises the steps that when echo intensity ZH of rainfall is small, the rainfall is estimated through the echo intensity ZH; when the echo intensity ZH of the rainfall is increased, if a value of ratio differential phase shift KDP and a value of a differential reflectivity factor ZDR are small, the rainfall is estimated through the echo intensity ZH and the differential reflectivity factor ZDR, if the value of the ratio differential phase shift KDP is small and the value of the differential reflectivity factor ZDR is large, the rainfall is estimated through the ratio differential phase shift KDP and the differential reflectivity factor ZDR, and if the value of the ratio differential phase shift KDP and the value of the differential reflectivity factor ZDR are large, the rainfall is estimated through the ratio differential phase shift KDP. According to the meteorology feature of precipitation particles, the raindrop spectrum feature of the precipitation particles of different sizes and the influence of rain belt attenuation are considered, a combined rainfall algorithm is adopted, the estimation result is accurate, precision is improved, and flash flood monitoring capacity is improved.

Description

technical field [0001] The invention relates to the technical field of meteorological radar data processing, in particular to a method for estimating rain intensity based on dual-linear polarization Doppler weather radar detection. Background technique [0002] my country is a country with a vast territory and complex terrain, which is seriously affected by meteorological disasters. According to statistics, about 600 million people are affected by major disastrous weather and climate such as drought, heavy rain and tropical storm in my country every year, and the average annual loss caused by meteorological disasters accounts for about 3% to 5% of the gross national product. Accurate and rapid acquisition of regional rainfall information is crucial for flood control and disaster reduction. Conventional radar can only get the intensity information of precipitation Z H , and due to the influence of the attenuation of the rain area and the inability to reflect the change of th...

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Application Information

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IPC IPC(8): G01S13/95G01S7/41
CPCG01S7/41G01S13/95Y02A90/10
Inventor 曹俊武陈晓辉屈凯峰汪旭东
Owner ANHUI SUN CREATE ELECTRONICS
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