Dual-polarization radar differential propagation phase shift estimation method based on particle filter

A particle filtering, dual-polarization technology, used in the reflection/re-radiation of radio waves, radio wave measurement systems, and the use of re-radiation, etc.

Inactive Publication Date: 2018-01-12
CIVIL AVIATION UNIV OF CHINA
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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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  • Dual-polarization radar differential propagation phase shift estimation method based on particle filter
  • Dual-polarization radar differential propagation phase shift estimation method based on particle filter
  • Dual-polarization radar differential propagation phase shift estimation method based on particle filter

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[0025] The particle filter-based differential propagation phase shift estimation method for dual-polarization radar 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 dual-polarization radar differential propagation phase shift estimation method provided by the present invention includes the following steps in order:

[0027] 1) Using the relationship between the radar polarization parameters, 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, represents the excitation noise, y k Represents the observation vector, F represents the observation matrix, represents the observation noise.

[0032] The specific...

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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 meteorological radar signal processing, in particular 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, weather radar has been widely used in the prevention of meteorological disasters, severe weather forecasts and artificial weather modification. The meteorological radar detects the meteorological environment by emitting electromagnetic waves, and evaluates the characteristics of the meteorological target according to the change of the echo. When there is a rainy area on the path, it will cause the attenuation of the reflectivity. In order to accurately analyze the real characteristics of the meteorological target and improve the accuracy of precipitation estimation Accuracy requires an attenuation corr...

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Application Information

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Patent Type & Authority Applications(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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