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Estimation Method of Differential Propagation Phase Shift in Dual-polarization Radar Based on Particle Filter

A particle filter, dual-polarization technology, applied in the field of estimation of differential propagation phase shift of dual-polarization radar

Inactive Publication Date: 2020-05-08
CIVIL AVIATION UNIV OF CHINA
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  • Description
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  • Application Information

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Problems solved by technology

[0005] In order to solve the above problems, the object of the present invention is to provide a particle filter-based dual-polarization radar differential propagation that can guarantee the estimation accuracy of polarization parameters and can retain real meteorological information even when the prior information of the excitation noise is unknown. Estimation method of phase shift

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  • Estimation Method of Differential Propagation Phase Shift in Dual-polarization Radar Based on Particle Filter
  • Estimation Method of Differential Propagation Phase Shift in Dual-polarization Radar Based on Particle Filter
  • Estimation Method of Differential Propagation Phase Shift in Dual-polarization Radar Based on Particle Filter

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[0025] The method for estimating the differential propagation phase shift of the dual-polarization radar based on the particle filter provided by the present invention will be described in detail below with reference to the accompanying drawings and specific embodiments.

[0026] Such as figure 1 As shown, the particle filter-based differential propagation phase shift estimation method for dual-polarization radar provided by the present invention includes the following steps in sequence:

[0027] 1) Use the relationship between the radar polarization parameters to establish the state equation and observation equation;

[0028] The state equation and observation equation based on particle filter are expressed as follows:

[0029]

[0030]

[0031] Where x k Represents the state vector, T represents the state transition matrix, Indicates excitation noise, y k Represents the observation vector, F represents the observation matrix, Indicates observation noise.

[0032] The following descr...

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Abstract

The invention discloses a dual-polarization radar differential propagation phase shift estimation method based on particle filter. The estimation method includes the steps: building state and observation equations by the aid of the relationship between radar polarization parameters; performing initial sampling in a single range gate, calculating an importance density function by the aid of the state equation, and combining initial sampling data with the importance density function to obtain state prediction values; gaining a likelihood function by the aid of the observation equation in the single range gate, and iteratively updating importance weights; calculating average values of state vectors of all particles and the importance weights to estimate differential propagation phase shift and differential propagation phase shift rate. According to the method, the differential propagation phase shift can be accurately estimated, the filtered data have better continuity, smoothness and accuracy, the negative value of the differential propagation phase shift rate can be effectively inhibited as sampling is performed based on the unambiguous range of radar polarization parameters, real meteorological data are retained, and use conditions are wider.

Description

Technical field [0001] The invention belongs to the technical field of weather radar signal processing, and particularly relates to a method for estimating the differential propagation phase shift of a dual-polarization radar based on particle filtering. Background technique [0002] In order to solve the serious impact of meteorological disasters on my country's economy and life, meteorological radars have been widely used to prevent meteorological disasters, severe weather forecasts, and artificial weather influencing. Meteorological radar detects the meteorological environment by emitting electromagnetic waves, and evaluates the characteristics of meteorological targets according to the changes of echoes. When there is a rain area on the path, the reflectivity will be attenuated. In order to accurately analyze the true characteristics of meteorological targets, improve the estimation of precipitation Accuracy requires attenuation correction of reflectivity. Dual-polarization ...

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G01S13/95G01S7/02
CPCY02A90/10
Inventor 李海任嘉伟崔爱璐章涛
Owner CIVIL AVIATION UNIV OF CHINA
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