Millimeter wave radar rain measurement method and system

Abstract

The present invention discloses a millimeter-wave radar rain measurement method and system. First, an equivalent uniform sphere model of raindrops is obtained by using the equal cross-sectional area method. Then, an equivalent backscattering model of raindrops in the millimeter-wave band is established under the framework of scattering theory to obtain the distribution of raindrop backscattering coefficients as a function of raindrop diameter. Finally, the number of raindrops of different sizes is inverted and the real-time rainfall intensity is obtained through integration, thereby realizing millimeter-wave radar rain measurement. The method and system not only can be used stably for a long time, but also significantly improves the sensitivity of weak rainfall measurement and the accuracy of real-time rainfall intensity, thereby realizing accurate, rapid and real-time detection of rainfall intensity.

Description

Technical Field

[0001] The present invention relates to the field of radar detection technology, and in particular to a millimeter wave radar rain measurement method and system. Background Art

[0002] my country frequently experiences meteorological disasters, causing severe economic losses. Precipitation is a crucial factor, and accurate and quantitative rainfall estimation is crucial for preventing floods and mitigating secondary disasters caused by short, sudden rainfall events. Traditional rainfall measurement methods, such as graduated cylinders, can accurately measure rainfall intensity, but they lack long-term stability due to factors like bird nesting. Furthermore, vibration-based rainfall measurement methods, due to their weak vibrations and susceptibility to external interference, struggle to achieve high accuracy in light rainfall environments.

[0003] The existing method of measuring rainfall using dual-polarization radar can measure relatively accurately in light rain environments. However, as the rainfall intensity gradually increases, this method is greatly affected by raindrop attenuation and has certain limitations. Summary of the Invention

[0004] In view of this, an embodiment of the present invention provides a millimeter wave radar rain measurement method and system to solve the problems of short life and low accuracy of traditional rain measurement methods.

[0005] In order to achieve the above object, the present invention provides the following technical solutions:

[0006] An embodiment of the present invention provides a millimeter wave radar rain measurement method, comprising: constructing an equivalent uniform sphere model of a raindrop using a constant cross-sectional area method to obtain an equivalent raindrop diameter;

[0007] Based on the obtained equivalent raindrop diameter, a millimeter-wave band equivalent raindrop uniform backscattering model is established for a single spherical raindrop, and the backscattering coefficient of a single raindrop is obtained.

[0008] Based on the backscatter coefficient of a single raindrop, the number of raindrops within the effective illumination area of ​​the millimeter-wave radar's transmitting beam is obtained by backscattering uniform inversion.

[0009] By inverting and calculating the number of raindrops of different sizes, the real-time rainfall intensity is obtained through integration.

[0010] Optionally, the process of constructing an equivalent uniform sphere model of a raindrop using the equal cross-sectional area method includes:

[0011] When the raindrop diameter is less than or equal to 2 mm, the equivalent raindrop diameter is the real raindrop diameter. When the raindrop diameter is greater than 2 mm, the equivalent uniform sphere model of the raindrop is established using the equal volume approximation and based on the cross-sectional symmetry of the raindrop model:

[0012]

[0013] Where D is the actual raindrop diameter, is the equivalent raindrop diameter, and λ1 and λ2 are both empirical constants.

[0014] Alternatively, an equivalent raindrop uniform backscattering model in the millimeter wave band is established under the scattering theory framework and expressed as:

[0015]

[0016] Where σ is the backscattering coefficient of a single raindrop, represents the particle size parameter, is the equivalent raindrop diameter, and m is a positive integer.

[0017] Optionally, based on the backscatter coefficient of a single raindrop, the process of obtaining the number of raindrops within the effective illumination area of ​​the millimeter-wave radar's transmit beam using uniform backscattering inversion is as follows:

[0018] Calculate the sum of the raindrop scattering coefficients within the effective illumination area of ​​the millimeter-wave radar's transmitting beam:

[0019]

[0020] Where η is the radar backscatter coefficient per unit volume, is the effective illumination volume of the cone beam, N is the total number of raindrops in the area, R is the radar detection range, 2θ is the lobe width of the millimeter wave radar’s transmit beam, and h is the depth of the effective illumination area;

[0021] The energy spectra corresponding to raindrops of different diameters measured by millimeter-wave radar are as follows:

[0022]

[0023] Among them, P D is the total energy of raindrops with a diameter of D received in the effective illumination area, which can be directly measured. t is the radar transmission power, G is the radar antenna gain, λ is the millimeter wave radar wavelength, N D is the number of raindrops with a diameter of D in the effective illumination area, L S is the system loss, L atm Atmospheric attenuation loss, η D is the backscattering coefficient of a raindrop with a diameter of D per unit volume, expressed as:

[0024]

[0025] Then the number of raindrops with a diameter of D in the effective illumination area is:

[0026]

[0027] Optionally, the process of calculating the real-time rainfall intensity by inverting the number of raindrops of different sizes includes:

[0028] According to the number of raindrops in the effective irradiation area, the total volume of raindrops is calculated;

[0029] According to the corresponding relationship between the total volume of raindrops and rainfall intensity, the real-time rainfall intensity is calculated.

[0030] The total volume of raindrops is expressed as:

[0031]

[0032] The corresponding relationship between the total volume of raindrops and rainfall intensity is:

[0033]

[0034] An embodiment of the present invention further provides a millimeter wave radar rain measurement system, comprising:

[0035] The equivalent uniform sphere model building module is used to construct an equivalent uniform sphere model of raindrops using the equal cross-sectional area method to obtain the equivalent raindrop diameter;

[0036] The equivalent raindrop backscattering uniform model establishment module is used to establish the millimeter wave band equivalent raindrop backscattering uniform model for a single spherical raindrop based on the obtained equivalent raindrop diameter, and obtain the backscattering coefficient of a single raindrop;

[0037] The raindrop number inversion module is used to obtain the number of raindrops within the effective illumination area of ​​the millimeter-wave radar's transmitting beam based on the backscatter coefficient of a single raindrop using uniform backscattering inversion;

[0038] The rainfall intensity inversion module is used to invert the number of raindrops of different sizes and obtain the real-time rainfall intensity through integration.

[0039] An embodiment of the present invention further provides an electronic device, including:

[0040] A memory and a processor, wherein the memory and the processor are communicatively connected to each other, the memory stores computer instructions, and the processor executes the millimeter wave radar rain measurement method provided by an embodiment of the present invention by executing the computer instructions.

[0041] An embodiment of the present invention further provides a computer-readable storage medium, which stores computer instructions, and the computer instructions are used to enable the computer to execute the millimeter wave radar rain measurement method provided by the embodiment of the present invention.

[0042] The technical solution of the present invention has the following advantages:

[0043] The present invention provides a millimeter-wave radar rain measurement method and system. First, an equivalent uniform sphere model of raindrops is obtained by using the equal cross-sectional area method. Then, an equivalent backscattering model of raindrops in the millimeter-wave band is established under the framework of scattering theory to obtain the distribution of raindrop backscattering coefficients as a function of raindrop diameter. Finally, by inverting the number of raindrops of different sizes, the real-time rainfall intensity is calculated to realize millimeter-wave radar rain measurement. This method not only can be used stably for a long time, but also significantly improves the sensitivity of weak rainfall measurement and the accuracy of real-time rainfall intensity, thereby realizing accurate, rapid and real-time detection of rainfall intensity. BRIEF DESCRIPTION OF THE DRAWINGS

[0044] In order to more clearly illustrate the specific embodiments of the present invention or the technical solutions in the prior art, the following briefly introduces the drawings required for use in the specific 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 any creative work.

[0045] Figure 1 Flowchart of the millimeter wave radar rain measurement method in an embodiment of the present invention;

[0046] Figure 2 is the cross-sectional area coefficient value obtained from experiments in an embodiment of the present invention;

[0047] Figure 3 is a distribution diagram of raindrop backscatter coefficient versus diameter according to an embodiment of the present invention;

[0048] Figure 4 A schematic diagram of a geometric configuration of an effective illumination area of ​​a transmitting beam of a medium millimeter wave radar according to an embodiment of the present invention;

[0049] Figure 5 is an instantaneous raindrop spectrum according to an embodiment of the present invention;

[0050] Figure 6 is a diagram of raindrop energy distribution according to an embodiment of the present invention;

[0051] Figure 7 Schematic diagram of the structure of the millimeter wave radar rain measurement system in an embodiment of the present invention;

[0052] Figure 8 Schematic diagram of the structure of an electronic device in an embodiment of the present invention. DETAILED DESCRIPTION

[0053] To make the purpose, technical solutions, and advantages of the embodiments of the present invention more clear, the technical solutions in the embodiments of the present invention will be clearly and completely described below in conjunction with the accompanying drawings in the embodiments 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 those skilled in the art without making creative efforts shall fall within the scope of protection of the present invention.

[0054] According to an embodiment of the present invention, a millimeter wave radar rain measurement method embodiment is provided. It should be noted that the steps shown in the flowchart of the accompanying drawings can be executed in a computer system such as a set of computer executable instructions, such as Figure 1 As shown, the following steps are included:

[0055] Step S1: construct an equivalent uniform sphere model of a raindrop using the equal cross-sectional area method to obtain the equivalent raindrop diameter.

[0056] In traditional research, the shape of raindrops conforms to the following nonlinear equation:

[0057]

[0058] Among them, r(θ) represents the radius corresponding to different angles θ, a0 is the radius of the equal volume sphere, c n is the cross-sectional area coefficient obtained from the experiment, and its specific value is as follows Figure 2 shown.

[0059] When the raindrop diameter is greater than 2mm, the traditional modeling method involves tedious integration problems. In engineering, modeling accuracy is often sacrificed to ensure computational efficiency. To save computing resources and ensure modeling accuracy, the embodiment of the present invention uses the equal volume approximation and takes into account the cross-sectional symmetry of the raindrop model, simplifying the problem to solving the cross-sectional approximation. The cross-sectional area can be obtained from formula (1):

[0060]

[0061] The vertical cross section of a raindrop is symmetrical along the horizontal axis and asymmetrical along the vertical axis, so the upper half of the cross section is slightly larger and the lower half is slightly smaller. Let the major axis of the approximate ellipsoid cross section be a and the minor axis be d. Since the elliptical cross section is completely symmetrical along the horizontal and vertical axes, solving the minor axis d of the equivalent uniform ellipsoid becomes taking half of the maximum and minimum values ​​of the vertical axis of the model in (1), that is,

[0062]

[0063] Therefore, from the equal cross-sectional areas, the major axis a of the equivalent uniform ellipsoid can be obtained as,

[0064] a=A / d (4)

[0065] Since the horizontal cross section of the model in (1) is circular, according to previous studies, the other axis b of the equivalent uniform ellipsoid can be expressed as,

[0066] b=(λ1-λ2a0)a (5)

[0067] Among them, λ1 and λ2 are empirical constants, so the equal volume method is used, that is,

[0068]

[0069] An equivalent uniform sphere model of raindrops is established, and the equivalent raindrop diameter is obtained as:

[0070]

[0071] Where D = 2a0 is the actual raindrop diameter, is the equivalent raindrop diameter. In a specific embodiment, λ1=1.05 and λ2=0.131. This is only an example and is not limited to this.

[0072] Step S2: Based on the obtained equivalent raindrop diameter, a millimeter wave band equivalent raindrop uniform backscattering model is established for a single spherical raindrop to obtain the backscattering coefficient of the single raindrop.

[0073] Since the embodiment of the present invention equates the raindrop to a uniform sphere model, a millimeter wave band equivalent raindrop uniform backscattering model can be established for a single spherical raindrop to obtain the backscattering coefficient of a single raindrop. The distribution of the backscattering coefficient of a single raindrop is as follows: Figure 3 As shown, specifically expressed as:

[0074]

[0075] Where σ is the backscattering coefficient of a single raindrop, represents the particle size parameter, is the equivalent raindrop diameter in step S1, m represents a positive integer, a m 、b m is the scattering coefficient, which is expressed as follows:

[0076]

[0077]

[0078]

[0079]

[0080] Among them, J m+1 / 2 (ρ) is the Bessel function, H m+1 / 2(ρ) is the Hankel function, n is the complex refractive index of raindrops to electromagnetic waves, and the complex refractive index of the millimeter wave radar used can be obtained by the following formula:

[0081]

[0082] Among them, ε1 and ε2 are the real and imaginary parts of the dielectric constant of water, respectively, and the expressions are as follows:

[0083]

[0084]

[0085] In formulas (14) and (15), ε a =5.48,ε b =3.51 are all empirical constants,

[0086] ε s =s1+s2(θ-1) (16)

[0087] f p =p1-p2(θ-1)+p3(θ-1) 2 (17)

[0088] f s =s3-s4(θ-1) (18)

[0089] θ=a0 / T (19)

[0090] Among them, s1, s2, s3, s4, p1, p2, p3 and a0 are all empirical constants, T is the thermodynamic temperature (K), and f is the frequency of the electromagnetic wave emitted by the millimeter wave radar (GHz).

[0091] In one embodiment, the parameters of the electromagnetic waves emitted by the millimeter wave radar are as follows:

[0092] parameter Numerical Operating frequency band 60GHz bandwidth 3GHz Time width 60μs Beamwidth 12.8° Pulse repetition frequency 5KHz

[0093] Step S3: Based on the backscatter coefficient of a single raindrop, the number of raindrops within the effective illumination area of ​​the millimeter-wave radar's transmitting beam is obtained by using backscatter uniform inversion.

[0094] Since the transmitting beam of millimeter wave radar is a cone, such as Figure 4 As shown, within the half-power point, the lobe width is 2θ, and the cross-sectional area of ​​the beam at a distance R from the radar antenna is a circle, so the effective illumination volume of the conical beam is approximately:

[0095]

[0096] Where h = cτ is the depth of the effective irradiation area, τ is the pulse width, and c is the speed of light in a vacuum. Therefore, the sum of the raindrop scattering coefficients in this area can be expressed as:

[0097]

[0098] Where η is the radar backscatter coefficient per unit volume, and N is the total number of raindrops in the effective illumination area of ​​the transmitting beam.

[0099] Therefore, the total reflected energy of raindrops in this area is expressed as,

[0100]

[0101] Among them, P t is the radar transmission power, G is the radar antenna gain, λ is the millimeter wave radar wavelength, L s is the system loss, L atm is the atmospheric attenuation loss, R is the radar detection range (can be 0-25m), P rain It is the total energy of raindrops received within the effective illumination area of ​​the beam, which is determined by the amount of rainfall.

[0102] The millimeter wave radar selected in the embodiment of the present invention can measure the energy spectra corresponding to raindrops of different diameters, so formula (22) can be expressed as:

[0103]

[0104] Among them, P D is the total energy received by raindrops with a diameter of D in the effective illumination area, which can be directly measured, N D is the number of raindrops with diameter D in the area, η D The backscattering coefficient of a raindrop with a diameter of D per unit volume is expressed as:

[0105]

[0106] Among them, σ D is the scattering coefficient of a single raindrop.

[0107] Therefore, according to formulas (8), (23), and (24), the number of raindrops with a diameter of D in the area can be obtained as:

[0108]

[0109] Step S4: By performing inversion calculation on the number of raindrops of different sizes, the real-time rainfall intensity is obtained by integration.

[0110] Based on the number of raindrops obtained from formula (25), the total volume of raindrops can be calculated:

[0111]

[0112] Where, the equivalent diameter From formula (7), we can get:

[0113] Then, the rainfall intensity S can be calculated based on the total volume of raindrops. rain :

[0114]

[0115] Substituting formula (27) into formula (26) yields:

[0116]

[0117] Finally, millimeter-wave radar rainfall measurement is achieved by estimating rainfall intensity.

[0118] The rainfall measurement method provided by this invention first uses the method of equal cross-sectional areas to derive an equivalent uniform sphere model for raindrops. Then, within the framework of scattering theory, an equivalent backscattering model for raindrops in the millimeter-wave band is established to derive the distribution of the backscattering coefficient as a function of raindrop diameter. Finally, by inverting the number of raindrops of different sizes, real-time rainfall intensity is calculated to enable millimeter-wave radar rainfall measurement. Under most rainfall conditions, millimeter-wave radar rainfall measurement based on equivalent uniform backscattering theory enables accurate, rapid, and real-time detection of rainfall intensity and other indicators.

[0119] The test results are as follows Figure 5 and Figure 6 As shown, Figure 5 This is the instantaneous raindrop spectrum when the rainfall intensity is 66 mm / h. Figure 6 is the statistical distribution result after a rainfall. Figure 5 It can be seen that when the rainfall is in a torrential rain state, that is, there are raindrops distributed in the entire horizontal Doppler domain, which means that the rain in the sky at an instant contains raindrops of almost all diameters from small to large, and only torrential rain can reach this state; and the statistical results of rainfall show that the raindrops with a diameter of 1-2mm have reached an energy peak, and the raindrops distributed in 4-5mm have also reached an energy sub-peak. This is because the number of raindrops in the interval of 1-2mm is the largest, so the cumulative energy is the largest, and although the number of raindrops in the interval of 4-5mm is small, the energy of each raindrop is larger, and it also reaches an energy sub-peak. For comparison, Figure 6 The statistical results in the above data can be substituted into the method provided by the present invention to calculate the rainfall intensity, which is consistent with the actual rainfall intensity. The innovation of the rainfall measurement method provided by the present invention lies in the establishment of a new model and a new inversion method. The raindrop data measured through the experiment is verified to be the same as the actual rainfall intensity, thereby verifying the reliability and accuracy of the rainfall measurement method provided by the present invention through the experiment.

[0120] This embodiment also provides a millimeter wave radar rain measurement system, such as Figure 7 As shown, including:

[0121] The equivalent uniform sphere model building module 1 is used to construct an equivalent uniform sphere model of a raindrop using the equal cross-sectional area method to obtain the equivalent raindrop diameter. For details, please refer to the relevant description of step S1 in the above method embodiment, which will not be repeated here.

[0122] The equivalent raindrop uniform backscattering model establishment module 2 is used to establish an equivalent raindrop uniform backscattering model in the millimeter wave band for a single spherical raindrop based on the obtained equivalent raindrop diameter, and obtain the backscattering coefficient of a single raindrop; for details, please refer to the relevant description of step S2 in the above method embodiment, which will not be repeated here.

[0123] The raindrop number inversion module 3 is used to obtain the number of raindrops in the effective illumination area of ​​the millimeter wave radar's transmitting beam based on the backscattering coefficient of a single raindrop by using backscattering uniform inversion; for details, please refer to the relevant description of step S3 in the above method embodiment, which will not be repeated here.

[0124] The rainfall intensity inversion module 4 is used to invert and calculate the number of raindrops of different sizes and obtain the real-time rainfall intensity by integration. For details, please refer to the relevant description of step S4 in the above method embodiment, which will not be repeated here.

[0125] The millimeter wave radar rain measurement system in this embodiment is presented in the form of a functional unit, where the unit refers to a processor and memory that executes one or more software or fixed programs, and / or other devices that can provide the above functions.

[0126] The further functional description of each of the above modules is the same as that of the above corresponding embodiments and will not be repeated here.

[0127] According to an embodiment of the present invention, there is also provided an electronic device, such as Figure 8 As shown, the electronic device may include a processor 901 and a memory 902, wherein the processor 901 and the memory 902 may be connected via a bus or other means. Figure 8 The bus connection is taken as an example.

[0128] The processor 901 may be a central processing unit (CPU). The processor 901 may also be other general-purpose processors, digital signal processors (DSP), application-specific integrated circuits (ASIC), field-programmable gate arrays (FPGA), or other programmable logic devices, discrete gate or transistor logic devices, discrete hardware components, or a combination of the above chips.

[0129] Memory 902, as a non-transitory computer-readable storage medium, can be used to store non-transitory software programs, non-transitory computer executable programs, and modules, such as the program instructions / modules corresponding to the methods in the method embodiments of the present invention. Processor 901 executes the non-transitory software programs, instructions, and modules stored in memory 902 to perform various processor functions and data processing, thereby implementing the methods in the above-mentioned method embodiments.

[0130] The memory 902 may include a program storage area and a data storage area, wherein the program storage area may store an operating system and application programs required for at least one function; the data storage area may store data created by the processor 901, etc. In addition, the memory 902 may include a high-speed random access memory, and may also include a non-volatile memory, such as at least one disk storage device, a flash memory device, or other non-volatile solid-state storage device. In some embodiments, the memory 902 may optionally include a memory remotely located relative to the processor 901, and these remote memories may be connected to the processor 901 via a network. Examples of the above-mentioned network include, but are not limited to, the Internet, an intranet, a local area network, a mobile communication network, and combinations thereof.

[0131] One or more modules are stored in the memory 902 and, when executed by the processor 901 , perform the method in the above method embodiment.

[0132] The specific details of the above electronic device can be understood by referring to the corresponding descriptions and effects in the above method embodiments, and will not be repeated here.

[0133] Those skilled in the art will appreciate that all or part of the processes in the above-mentioned embodiments can be implemented by instructing the relevant hardware through a computer program. The program can be stored in a computer-readable storage medium. When the program is executed, it can include the processes of the above-mentioned embodiments. The storage medium can be a magnetic disk, an optical disk, a read-only memory (ROM), a random access memory (RAM), a flash memory, a hard disk drive (HDD), or a solid-state drive (SSD). The storage medium can also include a combination of the above-mentioned types of memory.

[0134] Although the embodiments of the present invention have been described with reference to the accompanying drawings, those skilled in the art may make various modifications and variations without departing from the spirit and scope of the present invention. Such modifications and variations are all within the scope defined by the appended claims.

Claims

1. A millimeter wave radar rainfall measurement method, characterized in that: include: The equivalent uniform sphere model of raindrops is constructed using the equal cross-sectional area method to obtain the equivalent raindrop diameter. Based on the obtained equivalent raindrop diameter, a millimeter-wave band equivalent raindrop uniform backscattering model is established for a single spherical raindrop, and the backscattering coefficient of a single raindrop is obtained. Based on the backscatter coefficient of a single raindrop, the number of raindrops within the effective illumination area of ​​the millimeter-wave radar's transmitting beam is obtained by backscattering uniform inversion. By inverting and calculating the number of raindrops of different sizes, the real-time rainfall intensity is obtained through integration.

2. The millimeter wave radar rain measurement method according to claim 1, characterized in that: The process of constructing an equivalent uniform sphere model of a raindrop using the equal cross-sectional area method includes: When the raindrop diameter is less than or equal to 2 mm, the equivalent raindrop diameter is the real raindrop diameter. When the raindrop diameter is greater than 2 mm, the equivalent uniform sphere model of the raindrop is established using the equal volume approximation and based on the cross-sectional symmetry of the raindrop model: Where D is the actual raindrop diameter, is the equivalent raindrop diameter, and λ1 and λ2 are both empirical constants.

3. The millimeter wave radar rain measurement method according to claim 2, characterized in that: The millimeter wave band equivalent raindrop uniform backscattering model is established under the scattering theory framework and is expressed as: Where σ is the backscattering coefficient of a single raindrop, represents the particle size parameter, is the equivalent raindrop diameter, and m is a positive integer.

4. The millimeter wave radar rain measurement method according to claim 3, characterized in that: The process of obtaining the number of raindrops within the effective illumination area of ​​the millimeter wave radar's transmitting beam based on the backscatter coefficient of a single raindrop by using backscatter uniform inversion is as follows: Calculate the sum of the raindrop scattering coefficients within the effective illumination area of ​​the millimeter-wave radar's transmitting beam: Where η is the radar backscatter coefficient per unit volume, is the effective illumination volume of the cone beam, N is the total number of raindrops in the area, R is the radar detection range, 2θ is the lobe width of the millimeter wave radar’s transmit beam, and h is the depth of the effective illumination area; The energy spectra corresponding to raindrops of different diameters measured by millimeter-wave radar are as follows: Among them, P D is the total energy of raindrops with a diameter of D received in the effective illumination area, which can be directly measured. t is the radar transmission power, G is the radar antenna gain, λ is the millimeter wave radar wavelength, N D is the number of raindrops with a diameter of D in the effective illumination area, L S is the system loss, L atm Atmospheric attenuation loss, η D is the backscattering coefficient of a raindrop with a diameter of D per unit volume, expressed as: Then the number of raindrops with a diameter of D in the effective illumination area is:

5. The millimeter wave radar rain measurement method according to claim 4, characterized in that: The process of calculating the real-time rainfall intensity by inverting the number of raindrops of different sizes includes: According to the number of raindrops in the effective irradiation area, the total volume of raindrops is calculated; According to the corresponding relationship between the total volume of raindrops and rainfall intensity, the real-time rainfall intensity is calculated.

6. The millimeter wave radar rain measurement method according to claim 5, characterized in that: The total volume of raindrops is expressed as: The corresponding relationship between the total volume of raindrops and rainfall intensity is:

7. A millimeter wave radar rain measurement system, characterized in that: include: The equivalent uniform sphere model building module is used to construct an equivalent uniform sphere model of raindrops using the equal cross-sectional area method to obtain the equivalent raindrop diameter; The equivalent raindrop backscattering uniform model establishment module is used to establish the millimeter wave band equivalent raindrop backscattering uniform model for a single spherical raindrop based on the obtained equivalent raindrop diameter, and obtain the backscattering coefficient of a single raindrop; The raindrop number inversion module is used to obtain the number of raindrops within the effective illumination area of ​​the millimeter-wave radar's transmitting beam based on the backscatter coefficient of a single raindrop using uniform backscattering inversion; The rainfall intensity inversion module is used to invert the number of raindrops of different sizes and obtain the real-time rainfall intensity through integration.

8. An electronic device, characterized in that: include: A memory and a processor, wherein the memory and the processor are communicatively connected to each other, the memory stores computer instructions, and the processor executes the millimeter wave radar rain measurement method according to any one of claims 1 to 6 by executing the computer instructions.

9. A computer-readable storage medium, characterized in that The computer-readable storage medium stores computer instructions, and the computer instructions are used to enable the computer to execute the millimeter-wave radar rainfall measurement method according to any one of claims 1 to 6.

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