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Dual-polarization radar ratio differential phase shift rapid estimation method based on variational analysis

A dual-polarization and ratio-difference technology, applied in the field of dual-polarization radar ratio-difference phase shift estimation, can solve the problems of limited definition, poor action accuracy, and slow solution process of linear programming methods, achieving high computational efficiency and avoiding large errors. Effect

Active Publication Date: 2020-03-31
NANJING UNIV
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Problems solved by technology

This method guarantees the non-negativity of KDP, but on the one hand, this method is limited by the definition when estimating KDP, and only considers the use of observations ΦDP , in the case of light rain, the accuracy is poor due to random errors
In addition, the solution process of this linear programming method is slow, and it is difficult to apply it to real-time business

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  • Dual-polarization radar ratio differential phase shift rapid estimation method based on variational analysis
  • Dual-polarization radar ratio differential phase shift rapid estimation method based on variational analysis
  • Dual-polarization radar ratio differential phase shift rapid estimation method based on variational analysis

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Embodiment Construction

[0023] The technical solution of the present invention will be described in detail below in conjunction with the accompanying drawings. Figure 1~4 Taking Guangzhou S-band dual-polarization Doppler weather radar as an example, the realization process and algorithm performance of the algorithm of the present invention are demonstrated.

[0024] Specific steps are as follows:

[0025] Step 1, receive the calibrated Z in a plane scan of the dual-polarization radar H ,Z DR and ρ hv , Φ after dephasing and unfolding of the system DP ,Such as figure 1 shown.

[0026] Step 2, for the obtained Z H and Z DR Perform radial 7-point filtering; at the same time, using the self-consistency between the parameters of the dual-polarization radar, from Z H and Z DR Calculate K in DP The self-consistent relationship between the background value and the dual-polarization radar parameters can be fitted using drop spectrometer observations. Such as figure 2 In a, use the two-dimensiona...

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Abstract

The invention discloses a dual-polarization radar ratio differential phase shift rapid estimation method based on variational analysis, and the method comprises the steps: receiving phi DP which is subjected to system phase removing and folding removing processing in one plane scanning of a dual-polarization radar; taking the ratio differential phase shift KDP as a state vector of variational analysis, taking the distance integral of which the phi DP is KDP as an observation operator, taking the phi DP as observation, and constructing a cost function of the variational analysis; introducing aB spline interpolation operator into the state vector of variational analysis and the cost function of variational analysis; utilizing an LBFGSB algorithm to minimize a cost function, and introducinga condition that a state variable is non-negative into the cost function to obtain non-negative KDP. According to the method, the calculation efficiency required by business weather radar monitoring and the precision required when KDP is applied to quantitative rainfall estimation are both considered.

Description

technical field [0001] The invention relates to a method for estimating the ratio differential phase shift of a dual-polarization radar, in particular to a method for estimating the ratio difference phase shift of a dual-polarization radar based on variational analysis. Background technique [0002] The reflectivity factor Z that can be measured by dual polarization weather radar H , Differential reflectivity Z DR , Differential phase Φ DP , and the zero-lag correlation coefficient ρ hv Compared with conventional weather radar, it can obtain more precipitation information. Among them, Φ DP Is the phase feature, not affected by the attenuation of electromagnetic wave energy; its derivatives are more than the differential phase shift K DP The relationship between and rainfall rate is nearly linear. Φ DP and K DP It is often used in attenuation correction and precipitation inversion. K DP cannot be observed by dual-polarization radars, and needs to be measured from Φ ...

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Application Information

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IPC IPC(8): G01S13/95G01S7/40
CPCG01S13/95G01S7/4052Y02A90/10
Inventor 黄浩赵坤杨正玮
Owner NANJING UNIV
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