Raindrop spectrum inversion determination method and device based on cloud radar and dual polarization radar

Abstract

The present invention provides a method and device for determining raindrop spectrum inversion based on cloud radar and dual polarization radar, which relates to the field of atmospheric science and technology. The method comprises: obtaining multiple first raindrop spectra corresponding to a target area through cloud radar; obtaining a second raindrop spectrum corresponding to the target area and a second horizontal reflectivity factor corresponding to the second raindrop spectrum through a dual polarization radar; for each first raindrop spectrum, determining a target raindrop spectrum corresponding to the first raindrop spectrum based on all first raindrop spectra, second raindrop spectra and second horizontal reflectivity factors. The technical solution of the present invention combines the advantages of cloud radar and dual polarization radar, breaks through the limitation of using a single radar, and can obtain a more accurate target raindrop spectrum.

Description

Technical Field

[0001] The present invention relates to the field of atmospheric science and technology, and in particular to a method and device for determining raindrop spectrum inversion based on cloud radar and dual polarization radar. Background Art

[0002] The raindrop spectrum is the distribution of the number of raindrops per unit volume as a function of the size of the raindrops. It is an important parameter for studying rainfall characteristics, meteorological radar rainfall calculations, and radio wave propagation, and has important research value. Currently, there are technologies for determining the raindrop spectrum based on cloud radar inversion and dual-polarization radar inversion.

[0003] Cloud radar determines the raindrop spectrum by inverting the Doppler power spectrum. When inverting the raindrop spectrum, it is always overly sensitive to the vertical air motion speed, turbulence and attenuation. Therefore, cloud radar has poor detection capability for strong echoes and cannot accurately invert the raindrop spectrum of strong echo precipitation. This is an inherent problem of cloud radar equipment. Summary of the invention

[0004] The present invention provides a method and device for inverting and determining a raindrop spectrum based on a cloud radar and a dual-polarization radar, so as to solve the defect that the cloud radar in the prior art has poor detection capability for strong echoes and cannot accurately invert the raindrop spectrum of precipitation with strong echoes. The technical solution of the present invention combines the respective advantages of the cloud radar and the dual-polarization radar, breaks through the limitation of using a single radar, and can obtain a more accurate target raindrop spectrum.

[0005] The present invention provides a raindrop spectrum inversion and determination method based on cloud radar and dual-polarization radar, comprising the following steps.

[0006] Acquire multiple first raindrop spectra corresponding to the target area through a cloud radar;

[0007] Acquire a second raindrop spectrum corresponding to the target area and a second horizontal reflectivity factor corresponding to the second raindrop spectrum by a dual-polarization radar;

[0008] For each of the first raindrop spectra, a target raindrop spectra corresponding to the first raindrop spectra is determined based on all of the first raindrop spectra, the second raindrop spectra and the second horizontal reflectivity factor.

[0009] According to a raindrop spectrum inversion determination method based on cloud radar and dual-polarization radar provided by the present invention, the method of determining a target raindrop spectrum corresponding to the first raindrop spectrum based on all the first raindrop spectra, the second raindrop spectra and the second horizontal reflectivity factor includes:

[0010] When the second horizontal reflectivity factor is greater than a preset threshold, determining a first horizontal reflectivity factor and a first mass-weighted average diameter corresponding to the first raindrop spectrum based on the first raindrop spectrum;

[0011] Determining a second mass-weighted average diameter corresponding to the second raindrop spectrum by calculation based on the second raindrop spectrum;

[0012] A target raindrop spectrum corresponding to the first raindrop spectrum is determined based on all of the first horizontal reflectivity factors, the second horizontal reflectivity factors, all of the first mass-weighted average diameters, and the second mass-weighted average diameters.

[0013] According to a raindrop spectrum inversion determination method based on cloud radar and dual-polarization radar provided by the present invention, the target raindrop spectrum corresponding to the first raindrop spectrum is determined based on all the first horizontal reflectivity factors, the second horizontal reflectivity factors, all the first mass-weighted average diameters and the second mass-weighted average diameters, including:

[0014] determining a first correction factor based on all of the first horizontal reflectivity factors and the second horizontal reflectivity factors; determining a second correction factor based on all of the first mass-weighted average diameters and the second mass-weighted average diameters;

[0015] The first horizontal reflectivity factor corresponding to the first raindrop spectrum is corrected based on the first correction coefficient, and a target horizontal reflectivity factor corresponding to the first horizontal reflectivity factor is determined; the first mass weighted average diameter corresponding to the first raindrop spectrum is corrected based on the second correction coefficient, and a target mass weighted average diameter corresponding to the first mass weighted average diameter is determined; the target raindrop spectrum corresponding to the first raindrop spectrum is determined based on the first mass weighted average diameter, the target mass weighted average diameter and the target horizontal reflectivity factor.

[0016] According to a raindrop spectrum inversion determination method based on cloud radar and dual-polarization radar provided by the present invention, the first correction coefficient is determined based on all the first horizontal reflectivity factors and the second horizontal reflectivity factors; the second correction coefficient is determined based on all the first mass-weighted average diameters and the second mass-weighted average diameters, including:

[0017] determining a first average value of all the first horizontal reflectivity factors, and determining a quotient of the second horizontal reflectivity factor and the first average value as the first correction coefficient;

[0018] A second average value of all the first mass-weighted average diameters is determined, and a quotient of the second mass-weighted average diameter and the second average value is determined as the second correction factor.

[0019] According to a raindrop spectrum inversion determination method based on cloud radar and dual-polarization radar provided by the present invention, the target raindrop spectrum corresponding to the first raindrop spectrum is determined based on the first mass-weighted average diameter, the target mass-weighted average diameter and the target horizontal reflectivity factor, including:

[0020] determining an offset corresponding to the first raindrop spectrum based on a target deviation between the first mass-weighted average diameter and the target mass-weighted average diameter;

[0021] Correcting the first raindrop spectrum based on the offset, and determining a third raindrop spectrum corresponding to the first raindrop spectrum;

[0022] A target raindrop spectrum corresponding to the first raindrop spectrum is determined based on the third raindrop spectrum and the target horizontal reflectivity factor.

[0023] According to a raindrop spectrum inversion determination method based on cloud radar and dual-polarization radar provided by the present invention, the method of determining a target raindrop spectrum corresponding to the first raindrop spectrum based on the third raindrop spectrum and the target horizontal reflectivity factor includes:

[0024] determining a third horizontal reflectivity factor corresponding to the third raindrop spectrum based on the third raindrop spectrum;

[0025] Determine a target correction coefficient corresponding to the third raindrop spectrum based on the third horizontal reflectivity factor and the target horizontal reflectivity factor;

[0026] The third raindrop spectrum is corrected based on the target correction coefficient to determine a target raindrop spectrum corresponding to the first raindrop spectrum.

[0027] According to a raindrop spectrum inversion determination method based on cloud radar and dual polarization radar provided by the present invention, the method also includes:

[0028] When the second horizontal reflectivity factor is less than or equal to the preset threshold, the first raindrop spectrum is determined as the target raindrop spectrum.

[0029] The present invention also provides a raindrop spectrum inversion and determination device based on cloud radar and dual polarization radar, comprising the following modules:

[0030] A cloud radar module, used for acquiring a plurality of first raindrop spectra corresponding to a target area through a cloud radar;

[0031] A dual-polarization radar module, used for acquiring a second raindrop spectrum corresponding to the target area and a second horizontal reflectivity factor corresponding to the second raindrop spectrum through a dual-polarization radar;

[0032] A determination module is configured to determine, for each of the first raindrop spectra, a target raindrop spectrum corresponding to the first raindrop spectrum based on all of the first raindrop spectra, the second raindrop spectra and the second horizontal reflectivity factor.

[0033] The present invention also provides an electronic device, comprising a memory, a processor, and a computer program stored in the memory and executable on the processor, wherein when the processor executes the computer program, the method for inverting and determining a raindrop spectrum based on a cloud radar and a dual-polarization radar as described above is implemented.

[0034] The present invention also provides a non-transitory computer-readable storage medium having a computer program stored thereon. When the computer program is executed by a processor, the method for inverting and determining a raindrop spectrum based on a cloud radar and a dual-polarization radar as described in any one of the above is implemented.

[0035] The present invention also provides a computer program product, comprising a computer program, wherein when the computer program is executed by a processor, the method for inverting and determining a raindrop spectrum based on a cloud radar and a dual-polarization radar as described in any one of the above is implemented.

[0036] The raindrop spectrum inversion and determination method and device based on cloud radar and dual polarization radar provided by the present invention obtain multiple first raindrop spectra corresponding to the target area through cloud radar, and obtain the second raindrop spectrum corresponding to the target area and the second horizontal reflectivity factor corresponding to the second raindrop spectrum through dual polarization radar. Further, based on all the first raindrop spectra, the second raindrop spectrum and the second horizontal reflectivity factor, the target raindrop spectrum corresponding to each first raindrop spectrum is determined. The technical solution of the present invention combines the respective advantages of cloud radar and dual polarization radar, breaks through the limitations of using a single radar, and can obtain a more accurate target raindrop spectrum. BRIEF DESCRIPTION OF THE DRAWINGS

[0037] In order to more clearly illustrate the technical solutions in the present invention or the prior art, the following briefly introduces the drawings required for use in the embodiments or the description of the prior art. Obviously, the drawings described below are some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative work.

[0038] Figure 1 It is a flow chart of the raindrop spectrum inversion and determination method based on cloud radar and dual polarization radar provided by the present invention.

[0039] Figure 2 It is a schematic diagram comparing the evaluation results of the method provided by the present invention and the prior art.

[0040] Figure 3 It is a structural schematic diagram of a raindrop spectrum inversion and determination method based on cloud radar and dual-polarization radar provided by the present invention.

[0041] Figure 4 It is a structural schematic diagram of the electronic device provided by the present invention. DETAILED DESCRIPTION

[0042] In order to make the purpose, technical solution and advantages of the present invention clearer, the technical solution of the present invention will be clearly and completely described below in conjunction with the drawings of the present invention. Obviously, the described embodiments are part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0043] In view of the above problems in the prior art, the present invention provides a raindrop spectrum inversion and determination method based on cloud radar and dual polarization radar. Figure 1 is a flow chart of the raindrop spectrum inversion and determination method based on cloud radar and dual polarization radar provided by the present invention, such as Figure 1 As shown, the method includes the following:

[0044] Step 110: Acquire a plurality of first raindrop spectra corresponding to the target area through a cloud radar.

[0045] Specifically, a plurality of first raindrop spectra corresponding to the target area may be obtained by the cloud radar, wherein the cloud radar may be a dual-band cloud radar, and the range of the target area may be consistent with the detection range of the dual-polarization radar, and since the detection range of the dual-polarization radar is greater than the detection range of the dual-band cloud radar, the target area may correspond to a plurality of first raindrop spectra.

[0046] Step 120: Acquire a second raindrop spectrum corresponding to the target area and a second horizontal reflectivity factor corresponding to the second raindrop spectrum through a dual-polarization radar.

[0047] Specifically, the second raindrop spectrum corresponding to the target area and the second horizontal reflectivity factor corresponding to the second raindrop spectrum can be obtained by the dual polarization radar. It is easy to understand that the second horizontal reflectivity factor is a parameter that can be directly obtained during the process of the dual polarization radar observing the second raindrop spectrum.

[0048] Step 130: for each of the first raindrop spectra, determine a target raindrop spectrum corresponding to the first raindrop spectrum based on all of the first raindrop spectra, the second raindrop spectra and the second horizontal reflectivity factor.

[0049] Specifically, for each first raindrop spectrum, a target raindrop spectrum corresponding to the first raindrop spectrum may be determined based on all first raindrop spectra, second raindrop spectra and the second horizontal reflectivity factor.

[0050] Optionally, after the target raindrop spectra corresponding to the first raindrop spectra are determined, the overall raindrop spectrum corresponding to the target area may be determined based on all the target raindrop spectra.

[0051] In one embodiment, determining a target raindrop spectrum corresponding to the first raindrop spectrum based on all the first raindrop spectrum, the second raindrop spectrum and the second horizontal reflectivity factor includes:

[0052] When the second horizontal reflectivity factor is greater than a preset threshold, determining a first horizontal reflectivity factor and a first mass-weighted average diameter corresponding to the first raindrop spectrum based on the first raindrop spectrum;

[0053] Determining a second mass-weighted average diameter corresponding to the second raindrop spectrum by calculation based on the second raindrop spectrum;

[0054] A target raindrop spectrum corresponding to the first raindrop spectrum is determined based on all of the first horizontal reflectivity factors, the second horizontal reflectivity factors, all of the first mass-weighted average diameters, and the second mass-weighted average diameters.

[0055] Specifically, the second level reflectivity factor can be compared The preset threshold value can be set in advance as needed, for example, the preset threshold value can be set to 30 dBZ. When the value is greater than the preset threshold, the target area is characterized as a strong echo precipitation area. Therefore, for each first raindrop spectrum, the first raindrop spectrum can be used to Calculate and determine the first raindrop spectrum The corresponding first level reflectivity factor and the first mass-weighted mean diameter .

[0056] Exemplarily, the first level reflectivity factor and the first mass-weighted mean diameter It can be determined by the following formula:

[0057]

[0058]

[0059] in, represents the wavelength of radar electromagnetic waves corresponding to cloud radar, represents pi, represents the dielectric constant of water, The backscattering interface represents the margin for transmitting horizontally polarized waves. Represents the raindrop diameter.

[0060] It can also be based on the second raindrop spectrum Calculate and determine the second mass-weighted average diameter corresponding to the second raindrop spectrum .

[0061] Exemplarily, the second mass-weighted average diameter It can be determined by the following formula:

[0062]

[0063] Further, the target raindrop spectra corresponding to the first raindrop spectra may be determined based on all the first horizontal reflectivity factors, the second horizontal reflectivity factors, all the first mass-weighted average diameters, and the second mass-weighted average diameters.

[0064] In the above embodiment, when the second horizontal reflectivity factor is greater than the preset threshold, the first horizontal reflectivity factor and the first mass weighted average diameter corresponding to the first raindrop spectrum are calculated based on the first raindrop spectrum, and the second mass weighted average diameter corresponding to the second raindrop spectrum is calculated based on the second raindrop spectrum. A more accurate first horizontal reflectivity factor, first mass weighted average diameter, and second mass weighted average diameter can be obtained. Further, based on the above parameters, the first raindrop spectrum can be corrected to obtain a more accurate target raindrop spectrum corresponding to the first raindrop spectrum.

[0065] In one embodiment, determining a target raindrop spectrum corresponding to the first raindrop spectrum based on all the first horizontal reflectivity factors, the second horizontal reflectivity factors, all the first mass-weighted average diameters, and the second mass-weighted average diameters includes:

[0066] determining a first correction factor based on all of the first horizontal reflectivity factors and the second horizontal reflectivity factors; determining a second correction factor based on all of the first mass-weighted average diameters and the second mass-weighted average diameters;

[0067] The first horizontal reflectivity factor corresponding to the first raindrop spectrum is corrected based on the first correction coefficient, and a target horizontal reflectivity factor corresponding to the first horizontal reflectivity factor is determined; the first mass weighted average diameter corresponding to the first raindrop spectrum is corrected based on the second correction coefficient, and a target mass weighted average diameter corresponding to the first mass weighted average diameter is determined; the target raindrop spectrum corresponding to the first raindrop spectrum is determined based on the first mass weighted average diameter, the target mass weighted average diameter and the target horizontal reflectivity factor.

[0068] Specifically, the first correction coefficient may be determined based on all first level reflectivity factors and second level reflectivity factors. , a second correction coefficient can also be determined based on all first mass-weighted average diameters and second mass-weighted average diameters .

[0069] Furthermore, for each first raindrop spectrum, based on the first correction coefficient Corrected first raindrop spectrum The corresponding first level reflectivity factor , determine the first level reflectivity factor Corresponding target horizontal reflectivity factor . It is also possible to use the second correction factor Correct the first mass-weighted average diameter corresponding to the first raindrop spectrum , determine the first mass-weighted mean diameter The corresponding target mass-weighted mean diameter . For example, , . Then, based on the first mass-weighted average diameter , target mass weighted mean diameter and the target horizontal reflectivity factor , determine the first raindrop spectrum The corresponding target raindrop spectrum.

[0070] In the above embodiment, the first correction coefficient is determined based on all the first horizontal reflectivity factors and the second horizontal reflectivity factors, and the first correction coefficient can be used to more reasonably correct the first horizontal reflectivity factor. The second correction coefficient is determined based on all the first mass weighted average diameters and the second mass weighted average diameters, and the second correction coefficient can be used to more reasonably correct the first mass weighted average diameter. Then, according to the corrected target mass weighted average diameter and the target horizontal reflectivity factor, as well as the first mass weighted average diameter, the first raindrop spectrum can be corrected to obtain a more accurate target raindrop spectrum.

[0071] In one embodiment, determining a first correction factor based on all of the first horizontal reflectivity factors and the second horizontal reflectivity factors; determining a second correction factor based on all of the first mass-weighted average diameters and the second mass-weighted average diameters comprises:

[0072] determining a first average value of all the first horizontal reflectivity factors, and determining a quotient of the second horizontal reflectivity factor and the first average value as the first correction coefficient;

[0073] A second average value of all the first mass-weighted average diameters is determined, and a quotient of the second mass-weighted average diameter and the second average value is determined as the second correction factor.

[0074] Specifically, the first average value can be determined by summing up all the first level reflectivity factors and then dividing by the number of the first level reflectivity factors. Then, the quotient of the second level reflectivity factor and the first average value can be determined as the first correction coefficient. In addition, the second average value can be determined by summing up all the first mass-weighted average diameters and then dividing by the number of the first mass-weighted average diameters, and then the quotient of the second mass-weighted average diameter and the second average value can be determined as the second correction coefficient. .

[0075] In the above embodiment, the first average value of all first level reflectivity factors is determined, and the quotient of the second level reflectivity factor and the first average value is determined as the first correction coefficient, and the first correction coefficient can reasonably correct the first level reflectivity factor. The second average value of all first mass-weighted average diameters is also determined, and the quotient of the second mass-weighted average diameter and the second average value is determined as the second correction coefficient, and the second correction coefficient can reasonably correct the first mass-weighted average diameter.

[0076] In one embodiment, determining a target raindrop spectrum corresponding to the first raindrop spectrum based on the first mass-weighted average diameter, the target mass-weighted average diameter, and the target horizontal reflectivity factor includes:

[0077] determining an offset corresponding to the first raindrop spectrum based on a target deviation between the first mass-weighted average diameter and the target mass-weighted average diameter;

[0078] Correcting the first raindrop spectrum based on the offset, and determining a third raindrop spectrum corresponding to the first raindrop spectrum;

[0079] A target raindrop spectrum corresponding to the first raindrop spectrum is determined based on the third raindrop spectrum and the target horizontal reflectivity factor.

[0080] Specifically, the first mass-weighted average diameter can be determined first Target mass-weighted mean diameter Target deviation ,in, , and then the first raindrop spectrum can be determined based on the target deviation The corresponding offset , offset It can be determined by the following formula:

[0081]

[0082] Furthermore, based on the offset Correction of the first raindrop spectrum , determine the first raindrop spectrum The corresponding third raindrop spectrum ,in, , and then based on the third raindrop spectrum and the target horizontal reflectivity factor Determine the first raindrop spectrum Corresponding target raindrop spectrum .

[0083] In the above embodiment, based on the target deviation between the first mass weighted average diameter and the target mass weighted average diameter, the offset corresponding to the first raindrop spectrum is determined, and then the first raindrop spectrum is corrected based on the offset to determine the third raindrop spectrum corresponding to the first raindrop spectrum, and further based on the third raindrop spectrum and the target horizontal reflectivity factor, the target raindrop spectrum corresponding to the first raindrop spectrum is determined. This embodiment can determine a more accurate target raindrop spectrum by gradually correcting the first raindrop spectrum.

[0084] In one embodiment, determining a target raindrop spectrum corresponding to the first raindrop spectrum based on the third raindrop spectrum and the target horizontal reflectivity factor includes:

[0085] determining a third horizontal reflectivity factor corresponding to the third raindrop spectrum based on the third raindrop spectrum;

[0086] Determine a target correction coefficient corresponding to the third raindrop spectrum based on the third horizontal reflectivity factor and the target horizontal reflectivity factor;

[0087] The third raindrop spectrum is corrected based on the target correction coefficient to determine a target raindrop spectrum corresponding to the first raindrop spectrum.

[0088] Specifically, based on the third raindrop spectrum Determine the third raindrop spectrum The corresponding third level reflectivity factor It is easy to understand that the calculation method of determining the third horizontal reflectivity factor corresponding to the third raindrop spectrum based on the third raindrop spectrum is the same as the calculation method of determining the first horizontal reflectivity factor based on the first raindrop spectrum. and the target horizontal reflectivity factor Determine the target correction coefficient corresponding to the third raindrop spectrum ,in, , and then the target correction coefficient can be Correction of the third raindrop spectrum , determine the target raindrop spectrum corresponding to the first raindrop spectrum ,in, .

[0089] In the above embodiment, the third horizontal reflectivity factor corresponding to the third raindrop spectrum is first determined, and then the target correction coefficient is determined according to the third horizontal reflectivity factor, and the third raindrop spectrum is corrected by the target correction coefficient to obtain the target raindrop spectrum. After the third raindrop spectrum is corrected by the target correction coefficient, the accuracy of the obtained target raindrop spectrum is higher. The determination of the target raindrop spectrum combines the advantages of both cloud radar and dual-polarization radar.

[0090] In one embodiment, the method further comprises:

[0091] When the second horizontal reflectivity factor is less than or equal to the preset threshold, the first raindrop spectrum is determined as the target raindrop spectrum.

[0092] Specifically, when the second horizontal reflectivity factor is less than or equal to the preset threshold, it indicates that the target area is not a strong echo precipitation area. Therefore, there is no need to correct the first raindrop spectrum by the second raindrop spectrum corresponding to the dual-polarization radar, that is, the first raindrop spectrum can be directly determined as the target raindrop spectrum.

[0093] In the above embodiment, when the second horizontal reflectivity factor is less than or equal to the preset threshold, the first raindrop spectrum is directly determined as the target raindrop spectrum. In certain cases, a more accurate target raindrop spectrum can also be obtained without correction. It can be seen that the technical solution of the present invention can be applied to the inversion and determination of raindrop spectra in various regions.

[0094] For example, in order to compare the target raindrop spectrum obtained by the method of the present invention, the raindrop spectrum determined by a single cloud radar inversion, and the raindrop spectrum determined by a single dual-polarization radar, the mass-weighted average diameter is used. and the normalized moment parameter As the raindrop spectrum parameter, the normalized moment parameter It can be determined by the following formula:

[0095]

[0096] in, is the density of liquid water, Indicates the liquid water content. Liquid water content It can be determined by the following formula:

[0097]

[0098] in, Represents the raindrop spectrum.

[0099] Furthermore, the normalized relative error (NB), the normalized absolute error (NE) and the root mean square error (RMSE) can be used to determine the evaluation results of the method of the present invention and the prior art.

[0100]

[0101]

[0102]

[0103] in, represents the raindrop spectrum parameters calculated based on the raindrop spectrum determined by inversion, that is, Can be , or , represents the raindrop spectrum parameters calculated based on the raindrop spectrum determined by the raindrop spectrometer observation, Indicates For raindrop spectrum parameters, Represents the total number of raindrop spectrum parameters. Figure 2 : is a schematic diagram comparing the evaluation results of the method provided by the present invention and the prior art, such as Figure 2 As shown, the horizontal axis is the horizontal reflectivity factor , the vertical axes are NB, NE and RMSE respectively. The red line represents the evaluation result of dual polarization radar, the blue line represents the evaluation result of dual band cloud radar, and the green line represents the evaluation result of the patent method. Specifically, Figure 2 (a) Comparison of evaluation results of normalized relative error corresponding to mass-weighted mean diameter, Figure 2 (b) Comparison of the evaluation results of the normalized absolute error corresponding to the mass-weighted mean diameter. Figure 2 (c) Comparison of evaluation results of the root mean square error corresponding to the mass-weighted mean diameter, Figure 2 (d) Comparison of the evaluation results of the normalized relative error corresponding to the normalized order moment parameter. Figure 2 (e) Comparison of the evaluation results of the normalized absolute error corresponding to the normalized order moment parameter, Figure 2 (f) Comparison of the evaluation results of the root mean square error corresponding to the normalized order moment parameter. It can be seen that the results of the present invention are in the horizontal reflectivity factor When it is less than 30dBZ, it is closer to the result of cloud radar, while when it is greater than 30dBZ, it is closer to the result of dual polarization radar. , which is basically between the results of cloud radar and dual polarization radar. The present invention is actually an improvement based on the results of cloud radar. Figure 2 It can be seen that the present invention can retain the inversion advantage of cloud radar in weak echo precipitation areas, and can also combine the advantages of dual polarization radar to significantly improve the inversion of raindrop spectrum in strong echo precipitation areas. The above experimental results show that the present invention better combines the advantages of cloud radar and dual polarization radar.

[0104] The raindrop spectrum inversion and determination method based on cloud radar and dual polarization radar provided by the present invention obtains multiple first raindrop spectra corresponding to the target area through cloud radar, and obtains the second raindrop spectrum corresponding to the target area and the second horizontal reflectivity factor corresponding to the second raindrop spectrum through dual polarization radar. Further, based on all the first raindrop spectra, the second raindrop spectra and the second horizontal reflectivity factor, the target raindrop spectra corresponding to each first raindrop spectrum are determined. The technical solution of the present invention combines the respective advantages of cloud radar and dual polarization radar, breaks through the limitations of using a single radar, and can obtain a more accurate target raindrop spectrum.

[0105] The raindrop spectrum inversion and determination device based on cloud radar and dual polarization radar provided by the present invention is described below. The raindrop spectrum inversion and determination device based on cloud radar and dual polarization radar described below and the raindrop spectrum inversion and determination method based on cloud radar and dual polarization radar described above can be referred to each other.

[0106] Figure 3 : is a schematic diagram of the structure of a raindrop spectrum inversion and determination device based on cloud radar and dual polarization radar provided by the present invention. The raindrop spectrum inversion and determination device 300 based on cloud radar and dual polarization radar includes:

[0107] A cloud radar module 310 is used to obtain a plurality of first raindrop spectra corresponding to a target area through a cloud radar;

[0108] A dual-polarization radar module 320, configured to obtain a second raindrop spectrum corresponding to the target area and a second horizontal reflectivity factor corresponding to the second raindrop spectrum through a dual-polarization radar;

[0109] The determination module 330 is configured to determine, for each of the first raindrop spectra, a target raindrop spectrum corresponding to the first raindrop spectrum based on all of the first raindrop spectra, the second raindrop spectra, and the second horizontal reflectivity factor.

[0110] In one embodiment, the determination module 330 is specifically configured to:

[0111] When the second horizontal reflectivity factor is greater than a preset threshold, determining a first horizontal reflectivity factor and a first mass-weighted average diameter corresponding to the first raindrop spectrum based on the first raindrop spectrum;

[0112] Determining a second mass-weighted average diameter corresponding to the second raindrop spectrum by calculation based on the second raindrop spectrum;

[0113] A target raindrop spectrum corresponding to the first raindrop spectrum is determined based on all of the first horizontal reflectivity factors, the second horizontal reflectivity factors, all of the first mass-weighted average diameters, and the second mass-weighted average diameters.

[0114] In one embodiment, the determination module 330 is further configured to:

[0115] determining a first correction factor based on all of the first horizontal reflectivity factors and the second horizontal reflectivity factors; determining a second correction factor based on all of the first mass-weighted average diameters and the second mass-weighted average diameters;

[0116] The first horizontal reflectivity factor corresponding to the first raindrop spectrum is corrected based on the first correction coefficient, and a target horizontal reflectivity factor corresponding to the first horizontal reflectivity factor is determined; the first mass weighted average diameter corresponding to the first raindrop spectrum is corrected based on the second correction coefficient, and a target mass weighted average diameter corresponding to the first mass weighted average diameter is determined; the target raindrop spectrum corresponding to the first raindrop spectrum is determined based on the first mass weighted average diameter, the target mass weighted average diameter and the target horizontal reflectivity factor.

[0117] In one embodiment, the determination module 330 is further configured to:

[0118] determining a first average value of all the first horizontal reflectivity factors, and determining a quotient of the second horizontal reflectivity factor and the first average value as the first correction coefficient;

[0119] A second average value of all the first mass-weighted average diameters is determined, and a quotient of the second mass-weighted average diameter and the second average value is determined as the second correction factor.

[0120] In one embodiment, the determination module 330 is further configured to:

[0121] determining an offset corresponding to the first raindrop spectrum based on a target deviation between the first mass-weighted average diameter and the target mass-weighted average diameter;

[0122] Correcting the first raindrop spectrum based on the offset, and determining a third raindrop spectrum corresponding to the first raindrop spectrum;

[0123] A target raindrop spectrum corresponding to the first raindrop spectrum is determined based on the third raindrop spectrum and the target horizontal reflectivity factor.

[0124] In one embodiment, the determination module 330 is further configured to:

[0125] determining a third horizontal reflectivity factor corresponding to the third raindrop spectrum based on the third raindrop spectrum;

[0126] Determine a target correction coefficient corresponding to the third raindrop spectrum based on the third horizontal reflectivity factor and the target horizontal reflectivity factor;

[0127] The third raindrop spectrum is corrected based on the target correction coefficient to determine a target raindrop spectrum corresponding to the first raindrop spectrum.

[0128] In one embodiment, the raindrop spectrum inversion determination device based on cloud radar and dual polarization radar further includes a second determination module, which is specifically used to:

[0129] When the second horizontal reflectivity factor is less than or equal to the preset threshold, the first raindrop spectrum is determined as the target raindrop spectrum.

[0130] The raindrop spectrum inversion and determination device based on cloud radar and dual polarization radar provided by the present invention obtains multiple first raindrop spectra corresponding to the target area through cloud radar, and obtains the second raindrop spectrum corresponding to the target area and the second horizontal reflectivity factor corresponding to the second raindrop spectrum through dual polarization radar. Further, based on all the first raindrop spectra, the second raindrop spectrum and the second horizontal reflectivity factor, the target raindrop spectrum corresponding to each first raindrop spectrum is determined. The technical solution of the present invention combines the respective advantages of cloud radar and dual polarization radar, breaks through the limitations of using a single radar, and can obtain a more accurate target raindrop spectrum.

[0131] Figure 4 An example of a physical structure diagram of an electronic device is shown in FIG. Figure 4 As shown, the electronic device may include: a processor 410, a communication interface 420, a memory 430 and a communication bus 440, wherein the processor 410, the communication interface 420 and the memory 430 communicate with each other through the communication bus 440. The processor 410 may call the logic instructions in the memory 430 to execute the raindrop spectrum inversion determination method based on the cloud radar and the dual polarization radar, and the method includes:

[0132] Acquire multiple first raindrop spectra corresponding to the target area through a cloud radar;

[0133] Acquire a second raindrop spectrum corresponding to the target area and a second horizontal reflectivity factor corresponding to the second raindrop spectrum by a dual-polarization radar;

[0134] For each of the first raindrop spectra, a target raindrop spectra corresponding to the first raindrop spectra is determined based on all of the first raindrop spectra, the second raindrop spectra and the second horizontal reflectivity factor.

[0135] In addition, the logic instructions in the above-mentioned memory 430 can be implemented in the form of a software functional unit and can be stored in a computer-readable storage medium when it is sold or used as an independent product. Based on this understanding, the technical solution of the present invention, in essence, or the part that contributes to the prior art or the part of the technical solution, can be embodied in the form of a software product, and the computer software product is stored in a storage medium, including a number of instructions for a computer device (which can be a personal computer, a server, or a network device, etc.) to perform all or part of the steps of the method described in each embodiment of the present invention. The aforementioned storage medium includes: U disk, mobile hard disk, read-only memory (ROM, Read-Only Memory), random access memory (RAM, Random Access Memory), disk or optical disk, etc. Various media that can store program codes.

[0136] On the other hand, the present invention further provides a computer program product, the computer program product comprising a computer program, the computer program can be stored on a non-transitory computer-readable storage medium, when the computer program is executed by a processor, the computer can execute the raindrop spectrum inversion determination method based on cloud radar and dual polarization radar provided by the above methods, the method comprising:

[0137] Acquire multiple first raindrop spectra corresponding to the target area through a cloud radar;

[0138] Acquire a second raindrop spectrum corresponding to the target area and a second horizontal reflectivity factor corresponding to the second raindrop spectrum by a dual-polarization radar;

[0139] For each of the first raindrop spectra, a target raindrop spectra corresponding to the first raindrop spectra is determined based on all of the first raindrop spectra, the second raindrop spectra and the second horizontal reflectivity factor.

[0140] In another aspect, the present invention further provides a non-transitory computer-readable storage medium having a computer program stored thereon, which is implemented when the computer program is executed by a processor to execute the raindrop spectrum inversion determination method based on cloud radar and dual polarization radar provided by the above methods, the method comprising:

[0141] Acquire multiple first raindrop spectra corresponding to the target area through a cloud radar;

[0142] Acquire a second raindrop spectrum corresponding to the target area and a second horizontal reflectivity factor corresponding to the second raindrop spectrum by a dual-polarization radar;

[0143] For each of the first raindrop spectra, a target raindrop spectra corresponding to the first raindrop spectra is determined based on all of the first raindrop spectra, the second raindrop spectra and the second horizontal reflectivity factor.

[0144] The device embodiments described above are merely illustrative, wherein the units described as separate components may or may not be physically separated, and the components displayed as units may or may not be physical units, that is, they may be located in one place, or they may be distributed on multiple network units. Some or all of the modules may be selected according to actual needs to achieve the purpose of the scheme of this embodiment. Ordinary technicians in this field can understand and implement it without paying creative labor.

[0145] Through the description of the above implementation methods, those skilled in the art can clearly understand that each implementation method can be implemented by means of software plus a necessary general hardware platform, and of course, can also be implemented by hardware. Based on this understanding, the above technical solution is essentially or the part that contributes to the prior art can be embodied in the form of a software product, and the computer software product can be stored in a computer-readable storage medium, such as ROM / RAM, a disk, an optical disk, etc., including a number of instructions for a computer device (which can be a personal computer, a server, or a network device, etc.) to execute the methods described in each embodiment or some parts of the embodiments.

[0146] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention, rather than to limit it. Although the present invention has been described in detail with reference to the aforementioned embodiments, those skilled in the art should understand that they can still modify the technical solutions described in the aforementioned embodiments, or make equivalent replacements for some of the technical features therein. However, these modifications or replacements do not deviate the essence of the corresponding technical solutions from the spirit and scope of the technical solutions of the embodiments of the present invention.

Claims

1. A method for determining raindrop spectrum inversion based on cloud radar and dual polarization radar, characterized in that: include: Acquire multiple first raindrop spectra corresponding to the target area through a cloud radar; Acquire a second raindrop spectrum corresponding to the target area and a second horizontal reflectivity factor corresponding to the second raindrop spectrum by a dual-polarization radar; For each of the first raindrop spectra, determining a target raindrop spectrum corresponding to the first raindrop spectrum based on all of the first raindrop spectra, the second raindrop spectra and the second horizontal reflectivity factor; The determining a target raindrop spectrum corresponding to the first raindrop spectrum based on all the first raindrop spectrums, the second raindrop spectrums and the second horizontal reflectivity factor includes: When the second horizontal reflectivity factor is greater than a preset threshold, determining a first horizontal reflectivity factor and a first mass-weighted average diameter corresponding to the first raindrop spectrum based on the first raindrop spectrum; Determining a second mass-weighted average diameter corresponding to the second raindrop spectrum by calculation based on the second raindrop spectrum; determining a target raindrop spectrum corresponding to the first raindrop spectrum based on all of the first horizontal reflectivity factors, the second horizontal reflectivity factors, all of the first mass-weighted average diameters, and the second mass-weighted average diameters; When the second horizontal reflectivity factor is less than or equal to the preset threshold, the first raindrop spectrum is determined as the target raindrop spectrum.

2. The raindrop spectrum inversion and determination method based on cloud radar and dual polarization radar according to claim 1 is characterized in that: The determining a target raindrop spectrum corresponding to the first raindrop spectrum based on all the first horizontal reflectivity factors, the second horizontal reflectivity factors, all the first mass-weighted average diameters, and the second mass-weighted average diameters includes: determining a first correction factor based on all of the first horizontal reflectivity factors and the second horizontal reflectivity factors; determining a second correction factor based on all of the first mass-weighted average diameters and the second mass-weighted average diameters; The first horizontal reflectivity factor corresponding to the first raindrop spectrum is corrected based on the first correction coefficient, and a target horizontal reflectivity factor corresponding to the first horizontal reflectivity factor is determined; the first mass weighted average diameter corresponding to the first raindrop spectrum is corrected based on the second correction coefficient, and a target mass weighted average diameter corresponding to the first mass weighted average diameter is determined; the target raindrop spectrum corresponding to the first raindrop spectrum is determined based on the first mass weighted average diameter, the target mass weighted average diameter and the target horizontal reflectivity factor.

3. The raindrop spectrum inversion and determination method based on cloud radar and dual polarization radar according to claim 2 is characterized in that: determining a first correction factor based on all of the first horizontal reflectivity factors and the second horizontal reflectivity factors; Determining a second correction factor based on all of the first mass-weighted average diameters and the second mass-weighted average diameters includes: determining a first average value of all the first horizontal reflectivity factors, and determining a quotient of the second horizontal reflectivity factor and the first average value as the first correction coefficient; A second average value of all the first mass-weighted average diameters is determined, and a quotient of the second mass-weighted average diameter and the second average value is determined as the second correction factor.

4. The raindrop spectrum inversion and determination method based on cloud radar and dual polarization radar according to claim 2 is characterized in that: The determining, based on the first mass-weighted average diameter, the target mass-weighted average diameter and the target horizontal reflectivity factor, a target raindrop spectrum corresponding to the first raindrop spectrum comprises: determining an offset corresponding to the first raindrop spectrum based on a target deviation between the first mass-weighted average diameter and the target mass-weighted average diameter; Correcting the first raindrop spectrum based on the offset, and determining a third raindrop spectrum corresponding to the first raindrop spectrum; A target raindrop spectrum corresponding to the first raindrop spectrum is determined based on the third raindrop spectrum and the target horizontal reflectivity factor.

5. The raindrop spectrum inversion and determination method based on cloud radar and dual polarization radar according to claim 4 is characterized in that: The determining a target raindrop spectrum corresponding to the first raindrop spectrum based on the third raindrop spectrum and the target horizontal reflectivity factor includes: determining a third horizontal reflectivity factor corresponding to the third raindrop spectrum based on the third raindrop spectrum; Determine a target correction coefficient corresponding to the third raindrop spectrum based on the third horizontal reflectivity factor and the target horizontal reflectivity factor; The third raindrop spectrum is corrected based on the target correction coefficient to determine a target raindrop spectrum corresponding to the first raindrop spectrum.

6. A raindrop spectrum inversion and determination device based on cloud radar and dual polarization radar, characterized in that: include: A cloud radar module, used for acquiring a plurality of first raindrop spectra corresponding to a target area through a cloud radar; A dual-polarization radar module, used for acquiring a second raindrop spectrum corresponding to the target area and a second horizontal reflectivity factor corresponding to the second raindrop spectrum through a dual-polarization radar; a determination module, configured to determine, for each of the first raindrop spectra, a target raindrop spectrum corresponding to the first raindrop spectrum based on all of the first raindrop spectra, the second raindrop spectra and the second horizontal reflectivity factor; The determination module is specifically used for: When the second horizontal reflectivity factor is greater than a preset threshold, determining a first horizontal reflectivity factor and a first mass-weighted average diameter corresponding to the first raindrop spectrum based on the first raindrop spectrum; Determining a second mass-weighted average diameter corresponding to the second raindrop spectrum by calculation based on the second raindrop spectrum; determining a target raindrop spectrum corresponding to the first raindrop spectrum based on all of the first horizontal reflectivity factors, the second horizontal reflectivity factors, all of the first mass-weighted average diameters, and the second mass-weighted average diameters; The raindrop spectrum inversion and determination device based on cloud radar and dual polarization radar further includes a second determination module, and the second determination module is specifically used for: When the second horizontal reflectivity factor is less than or equal to the preset threshold, the first raindrop spectrum is determined as the target raindrop spectrum.

7. An electronic device comprising a memory, a processor, and a computer program stored in the memory and executable on the processor, characterized in that: When the processor executes the computer program, the raindrop spectrum inversion and determination method based on cloud radar and dual polarization radar is implemented as described in any one of claims 1 to 5.

8. A non-transitory computer-readable storage medium having a computer program stored thereon, characterized in that: When the computer program is executed by a processor, the raindrop spectrum inversion and determination method based on cloud radar and dual polarization radar is implemented as described in any one of claims 1 to 5.

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