CN-122017774-A - Meter scattering signal identification method and device, electronic equipment and storage medium

CN122017774ACN 122017774 ACN122017774 ACN 122017774ACN-122017774-A

Abstract

The invention provides a method, a device, electronic equipment and a storage medium for recognizing a meter scattering signal, which belong to the technical field of signal processing and comprise the steps of obtaining X-band dual-polarization radar data and S-band radar reflectivity; an attenuation correction model is built based on the differential propagation phase and the undetermined correction coefficient, an objective function is determined based on the attenuation correction model and the S-band radar reflectivity, an optimal correction coefficient is obtained by solving the objective function, the X-band reflectivity is corrected based on the optimal correction coefficient and the attenuation correction model, the X-band optimal correction reflectivity is obtained, and the Mie scattering signal is determined based on the interpolation S-band radar reflectivity and the X-band optimal correction reflectivity. According to the method, the optimal correction coefficient is determined by solving the objective function, and the accurate attenuation correction of the reflectivity of the X-wave band is realized by utilizing the optimal correction coefficient and the attenuation correction model, so that the difference value of the corrected reflectivity of the S-wave band and the X-wave band in a strong echo interval is obtained, and the accurate identification of the meter scattering signal is realized.

Inventors

FENG LIANG
YANG JIEFAN
HUANG MENGYU
HE HUI
CHEN YICHEN
SUN JIMING
SUN YUE

Assignees

中国科学院大气物理研究所

Dates

Publication Date: 20260512
Application Date: 20260112

Claims (10)

1. A method for identifying a rice scattering signal, comprising: Acquiring X-band dual-polarization radar data and S-band radar reflectivity of a detection area, wherein the X-band dual-polarization radar data comprise differential propagation phases and X-band reflectivity, and the differential propagation phases are accumulated phase differences generated on a propagation path by horizontal polarized waves and vertical polarized waves emitted by the X-band dual-polarization radar; interpolating the S-band radar reflectivity into a coordinate system of the X-band dual-polarization radar data to obtain an interpolated S-band radar reflectivity; establishing an attenuation correction model based on the differential propagation phase and the undetermined correction coefficient, determining an objective function based on the attenuation correction model and the interpolation S-band radar reflectivity in a first reflectivity interval, and solving the objective function to obtain an optimal correction coefficient, wherein the reflectivity of the first reflectivity interval meets Rayleigh scattering conditions; correcting the reflectivity of the X-band based on the optimal correction coefficient and the attenuation correction model to obtain the optimal correction reflectivity of the X-band; And determining a meter scattering signal in a second reflectivity interval based on a difference value between the interpolated S-band radar reflectivity and the X-band optimal correction reflectivity, wherein the reflectivity of the second reflectivity interval is larger than a preset reflectivity threshold.
2. The method of claim 1, wherein the constructing an attenuation correction model based on the differential propagation phases and the undetermined correction coefficients comprises: Acquiring an initial phase of an X-band dual-polarization radar transmitting signal; Determining an attenuation compensation amount based on the undetermined correction coefficient, the differential propagation phase, and the initial phase; And constructing the attenuation correction model based on the X-band reflectivity and the attenuation compensation quantity.
3. The method for identifying a rice scattering signal according to claim 2, wherein the attenuation correction model is: ; Wherein, the The reflectivity is corrected for the X-band at range radar r, For the X-band reflectivity at range radar r, For the pending correction factor; For the differential propagation phase at range radar r, Is the initial phase of the X-band dual-polarization radar transmit signal.
4. The method for identifying a Mie scattering signal according to claim 1, wherein determining an objective function based on the attenuation correction model and the interpolated S-band radar reflectivity, solving the objective function to obtain an optimal correction coefficient comprises: calculating an X-band correction reflectivity based on the attenuation correction model containing the undetermined correction coefficient; constructing the objective function representing the difference between the X-band correction reflectivity and the interpolation S-band radar reflectivity, wherein the objective function is a function taking the undetermined correction coefficient as an independent variable; Traversing the value of the undetermined correction coefficient within a preset numerical range according to a preset step length, calculating an objective function value corresponding to the undetermined correction coefficient, and selecting the numerical value of the undetermined correction coefficient corresponding to the minimum objective function value as the optimal correction coefficient.
5. The method of claim 4, wherein the objective function is: ; Wherein, the As the value of the difference, For interpolation S-band radar reflectivity at range radar r, For the X-band reflectivity at range radar r, For the pending correction factor; For the differential propagation phase at range radar r, Is the initial phase of the X-band dual-polarization radar transmit signal.
6. The method for identifying a Mit scattering signal according to claim 1, wherein the correcting the reflectivity of the X-band based on the optimal correction coefficient and the attenuation correction model to obtain an optimal corrected reflectivity of the X-band comprises: calculating an optimal attenuation compensation amount on a radar detection path based on the optimal correction coefficient, the differential propagation phase and an initial phase of an X-band dual-polarization radar transmission signal; And obtaining the optimal correction reflectivity of the X wave band based on the optimal attenuation compensation quantity and the reflectivity of the X wave band.
7. The method of claim 1, wherein the differential propagation phase is obtained based on the steps of: acquiring an original phase observation value obtained by X-band dual-polarization radar detection; acquiring a backward scattering differential phase contained in the original phase observation value; and filtering the backward scattering differential phase from the original phase observation value to obtain the differential propagation phase.
8. A rice scattering signal identification device, comprising: The data acquisition unit is used for acquiring X-band dual-polarization radar data and S-band radar reflectivity of a detection area, wherein the X-band dual-polarization radar data comprise differential propagation phases and X-band reflectivity, and the differential propagation phases are accumulated phase differences generated on a propagation path by horizontal polarized waves and vertical polarized waves emitted by the X-band dual-polarization radar; The data mapping unit is used for interpolating the reflectivity of the S-band radar into the coordinate system of the X-band dual-polarization radar data to obtain the reflectivity of the interpolation S-band radar; The system comprises an attenuation correction unit, an interpolation S-band radar reflection rate correction unit, an X-band correction unit and an X-band correction unit, wherein the attenuation correction unit is used for constructing an attenuation correction model based on the differential propagation phase and the undetermined correction coefficient; the signal identification unit is used for determining a meter scattering signal based on the difference value between the interpolated S-band radar reflectivity and the X-band optimal correction reflectivity in a second reflectivity interval, and the reflectivity of the second reflectivity interval is larger than a preset reflectivity threshold.
9. An electronic device comprising a memory, a processor and a computer program stored on the memory and running on the processor, characterized in that the processor implements the method of identifying rice scattering signals according to any of claims 1 to 7 when executing the computer program.
10. A non-transitory computer readable storage medium having stored thereon a computer program, wherein the computer program when executed by a processor implements the method of identifying rice scattering signals according to any of claims 1 to 7.

Description

Meter scattering signal identification method and device, electronic equipment and storage medium Technical Field The present invention relates to the field of signal processing technologies, and in particular, to a method and apparatus for identifying a scattered signal, an electronic device, and a storage medium. Background Scattering phenomena occur when electromagnetic waves propagate in the atmosphere and encounter particles such as cloud, rain, ice, snow or hail. Taking hail detection as an example, an S-band radar is usually located in a rayleigh scattering region, and an X-band radar is easy to enter a rice scattering region due to a short wavelength, so that an obvious rice scattering signal is generated. Based on the difference characteristic of the S/X dual-band radar when detecting hail, hail particles can be effectively identified, and the monitoring and early warning capability of strong convection weather is improved. The accurate identification of the meter scattering signal is the key for detecting and identifying particles such as hail by the S/X dual-band radar. The prior art generally uses an empirical factor dependent attenuation correction model for the identification of the rice scattering signal. However, the stability of the attenuation correction model is easily affected by the type of precipitation, and significant correction errors are easily introduced in practical application, so that the accuracy of identifying the meter scattering signals is insufficient. Disclosure of Invention The invention provides a method, a device, electronic equipment and a storage medium for identifying a rice scattering signal, which are used for solving the defects that the stability of an attenuation correction model depending on an empirical coefficient is easily affected by a precipitation type and a significant correction error is easily introduced in the prior art, realizing the accurate identification of the rice scattering signal and improving the accuracy and reliability of the identification of the rice scattering signal. The invention provides a method for identifying rice scattering signals, which comprises the following steps: Acquiring X-band dual-polarization radar data and S-band radar reflectivity of a detection area, wherein the X-band dual-polarization radar data comprise differential propagation phases and X-band reflectivity, and the differential propagation phases are accumulated phase differences generated on a propagation path by horizontal polarized waves and vertical polarized waves emitted by the X-band dual-polarization radar; interpolating the S-band radar reflectivity into a coordinate system of the X-band dual-polarization radar data to obtain an interpolated S-band radar reflectivity; establishing an attenuation correction model based on the differential propagation phase and the undetermined correction coefficient, determining an objective function based on the attenuation correction model and the interpolation S-band radar reflectivity in a first reflectivity interval, and solving the objective function to obtain an optimal correction coefficient, wherein the reflectivity of the first reflectivity interval meets Rayleigh scattering conditions; correcting the reflectivity of the X-band based on the optimal correction coefficient and the attenuation correction model to obtain the optimal correction reflectivity of the X-band; And determining a meter scattering signal in a second reflectivity interval based on a difference value between the interpolated S-band radar reflectivity and the X-band optimal correction reflectivity, wherein the reflectivity of the second reflectivity interval is larger than a preset reflectivity threshold. According to the method for identifying the Mie scattering signal provided by the invention, the attenuation correction model is constructed based on the differential propagation phase and the coefficient to be corrected, and the method comprises the following steps: Acquiring an initial phase of an X-band dual-polarization radar transmitting signal; Determining an attenuation compensation amount based on the undetermined correction coefficient, the differential propagation phase, and the initial phase; And constructing the attenuation correction model based on the X-band reflectivity and the attenuation compensation quantity. According to the method for identifying the rice scattering signals provided by the invention, the attenuation correction model is as follows: ; Wherein, the The reflectivity is corrected for the X-band at range radar r,For the X-band reflectivity at range radar r,For the pending correction factor; For the differential propagation phase at range radar r, Is the initial phase of the X-band dual-polarization radar transmit signal. According to the method for identifying the Mie scattering signal, provided by the invention, an objective function is determined based on the attenuation correction model and the interpolatio