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A Nonlinear Inversion Method of Vertical Wind Profile Based on Doppler Weather Radar

A technology of weather radar and wind profile, which is applied in the field of atmospheric science research, can solve problems such as the inability to effectively deal with nonlinear wind fields, and achieve the effect of improving stability

Active Publication Date: 2017-05-03
NANJING UNIV
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

Its primary technical purpose is to change the problem that existing technologies cannot effectively deal with nonlinear wind fields in observations that contain missing measurements and noise

Method used

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  • A Nonlinear Inversion Method of Vertical Wind Profile Based on Doppler Weather Radar
  • A Nonlinear Inversion Method of Vertical Wind Profile Based on Doppler Weather Radar
  • A Nonlinear Inversion Method of Vertical Wind Profile Based on Doppler Weather Radar

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Embodiment Construction

[0032] The technical solutions of the present invention will be described in detail below in conjunction with the accompanying drawings.

[0033] 1. Modeling

[0034] The Taylor expansion of the horizontal component of the actual wind field at the center of the radar can be expressed as:

[0035]

[0036] Doppler radial velocity V d and the product rV of the radial distance r d Expressed as:

[0037] v d =ux+vy+wz (4)

[0038] Bring (3) into (4), rV d The corresponding relationship with the actual wind field is:

[0039]

[0040] The above formula can be simplified as:

[0041]

[0042] Comparing the coefficients c in formula (6) ij and the parameters of the actual wind field in formula (5) can be obtained:

[0043] c 10 = u 0 , c 01 =v 0 (7)

[0044] By solving the coefficients in equation (6), the horizontal wind at different heights can be obtained to obtain the vertical wind profile.

[0045] 2. Inversion

[0046] For the convenience of explanatio...

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Abstract

The invention relates to a vertical wind profile nonlinear inversion method based on a Doppler weather radar. The method includes the following steps that (1) an actual horizontal wind field in a certain height is selected at will and shown in a Taylor polynomial expansion mode; (2) the radar speed observation is represented by rVd; (3)the polynomial in the step (1) is plugged into a rVd expression in the step (2) to obtain a rVd theoretical expression of a nonlinear downstream wind field; (4) arithmetic product of Doppler data Vd of each observation point of the radar and radial distance r between the observation point and the radar is calculated to obtain an actual physical quantity of the rVd; (5) the observed actual physical quantity rVd in the step (4) is plugged into the rVd theoretical expression in the step (3), and the mathematical expression is subjected to polynomial fitting so as to figure out horizontal wind speed of the height; (6) data of different heights are selected, the process from the step (1) to the step (5) is repeated, and thereby, a vertical wind profile can be obtained. By means of the vertical wind profile nonlinear inversion method based on the Doppler weather radar, inversion of the horizontal wind field and the vertical wind profile can be well performed, and the problem that the calculation is not stable due to non-uniform data distribution by traditional methods is solved.

Description

technical field [0001] The invention relates to a vertical wind profile inversion method based on Doppler weather radar, especially a vertical wind profile inversion method for actual wind field containing a large number of missing and strong nonlinear components, which belongs to atmospheric science (Remote Sensing Data Analysis) research field, for Doppler weather radar vertical wind profile inversion and nowcasting. Background technique [0002] The retrieval of vertical wind profiles (horizontal wind speed versus height) is one of the most important operational applications of Doppler weather radars. Previous inversion methods generally include the following two steps: [0003] ①Choose a reasonable mathematical model to model the actual wind field according to the spatial distribution characteristics of the actual wind field; [0004] ② Use the radial velocity observed by Doppler weather radar to fit the corresponding mathematical model, so as to obtain the required ho...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G01S13/95
CPCG01S7/41G01S13/95Y02A90/10
Inventor 唐晓文朱坚王元
Owner NANJING UNIV
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