Method and related device for synchronously determining radial wind speed and aerosol backscattering ratio

Abstract

The present application discloses a method and related device for synchronously determining radial wind speed and aerosol backscattering ratio, which relates to the field of atmospheric detection technology. It includes: obtaining N normalized wind speed ratios corresponding to N laser pulses with different frequencies; determining N projection curves based on a preset target look-up table and the N normalized wind speed ratios; determining the radial wind speed and aerosol backscattering ratio within a target time range based on the N projection curves. Since N laser pulses with different frequencies emitted by the same light source within the target time period are used to obtain the corresponding N normalized wind speed ratios, the diversity of data is ensured; and because a preset target look-up table that details the complex correspondence relationship between the normalized wind speed ratio, radial wind speed, and aerosol backscattering ratio is utilized, it is ensured that relatively accurate N projection curves can be obtained without a large amount of real-time calculation; according to the relationship between the N projection curves, the radial wind speed and aerosol backscattering ratio can be synchronously determined.

Description

Technical Field

[0001] The present application relates to the field of atmospheric detection technology, and in particular to a method and related device for synchronously determining radial wind speed and aerosol backscatter ratio. Background Art

[0002] The wind profile is a curve showing the change of wind speed with height. It is an important parameter in the fields of meteorology, atmospheric science and environmental science. It can be used to improve the accuracy of numerical weather forecasts, assess the potential of wind energy resources and understand the diffusion of atmospheric pollutants.

[0003] Generally, when measuring the wind profile, a measuring device such as a laser radar can be used to measure the radial wind speed at different heights within the target height range, and then the radial wind speeds at each height measured are connected to obtain the wind profile. For example, the radial wind speed at a height of 1 km from the ground, the radial wind speed at a height of 2 km from the ground, and the radial wind speed at a height of 3 km from the ground are measured in sequence, and then the radial wind speeds corresponding to the above three heights are connected to obtain the wind profile within a height range of 3 km from the ground.

[0004] The aerosol backscatter ratio is the ratio of the aerosol backscatter coefficient to the total scattering coefficient. It is a key parameter for evaluating the optical properties and environmental impacts of aerosols. It can be used to assess air quality, understand the scattering, absorption and radiation effects of aerosols, and understand the mechanism of aerosol action on climate change.

[0005] Wind profiles and aerosol backscatter ratios influence each other. For example, when using laser radar and other equipment to measure wind profiles, the influence of aerosols in the atmosphere needs to be considered; when studying the optical properties of aerosols, the influence of wind field structure on aerosol distribution and transmission also needs to be considered. At the same time, by in-depth study of the relationship between them, we can further understand the relevant laws of atmospheric environment and meteorology, and provide a scientific basis for environmental protection, climate change response, and energy development.

[0006] How to synchronously determine the radial wind speed and aerosol backscatter ratio, and then synchronously obtain the wind profile and aerosol backscatter ratio, has become one of the technical problems that need to be urgently solved in the field of atmospheric detection technology. Summary of the invention

[0007] Based on the above problems, the present application provides a method for synchronously determining radial wind speed and aerosol backscatter ratio, which can solve the problem of asynchronous measurement of wind profile and aerosol backscatter ratio and realize synchronous measurement of wind profile and aerosol backscatter ratio.

[0008] The embodiments of the present application disclose the following technical solutions:

[0009] The first aspect of the present application discloses a method for synchronously determining the radial wind speed and the aerosol backscattering ratio. The method includes:

[0010] Determine a preset target lookup table; the target lookup table indicates the corresponding relationship between the normalized wind speed ratio, the radial wind speed, and the aerosol backscattering ratio;

[0011] Obtain N normalized wind speed ratios corresponding to N laser pulses of different frequencies; the N laser pulses of different frequencies correspond one-to-one with the N normalized wind speed ratios; N is an integer greater than or equal to 2; the N laser pulses of different frequencies are emitted by the same light source within a target time range;

[0012] Based on the target lookup table and the N normalized wind speed ratios, determine N projection curves; the N normalized wind speed ratios correspond one-to-one with the N projection curves; the projection curves indicate the corresponding relationship between the aerosol backscattering ratio and the radial wind speed;

[0013] Based on the N projection curves, determine the radial wind speed and the aerosol backscattering ratio corresponding to the target time range.

[0014] In an optional implementation, N is 3; the determining the radial wind speed and the aerosol backscattering ratio corresponding to the target time range based on the N projection curves includes:

[0015] Construct a target triangle with the intersection points of every two of the three projection curves as vertices;

[0016] Take the abscissa of the incenter of the target triangle as the radial wind speed corresponding to the target time range, and take the ordinate of the incenter as the aerosol backscattering ratio corresponding to the target time range.

[0017] In an optional implementation, the determining N projection curves based on the target lookup table and the N normalized wind speed ratios includes:

[0018] Based on the N normalized wind speed ratios and a preset allowable error, determine N target normalized wind speed ratio sets; the N normalized wind speed ratios correspond one-to-one with the N target normalized wind speed ratio sets; the normalized wind speed ratios in the target normalized wind speed ratio sets are the normalized wind speed ratios in the target lookup table;

[0019] Based on the N target normalized wind speed ratio sets and the target lookup table, determine the N projection curves; the N target normalized wind speed ratio sets correspond one-to-one with the N projection curves.

[0020] In an alternative implementation, determining the N projection curves based on the N sets of target normalized wind speed ratios and the target look-up table includes:

[0021] Determine N initial projection curves based on the N sets of target normalized wind speed ratios and the target look-up table;

[0022] Smooth each of the initial projection curves to obtain the N projection curves.

[0023] In an alternative implementation, the target laser frequency is any one of the N laser frequencies, and the steps for obtaining the normalized wind speed ratio corresponding to the target laser frequency include:

[0024] Determine a first direction and a second direction opposite to the first direction;

[0025] Obtain a first measured wind speed ratio corresponding to the target laser frequency in the first direction and a second measured wind speed ratio corresponding to the target laser frequency in the second direction;

[0026] Take the average of the first measured wind speed ratio and the second measured wind speed ratio as the measured zero wind speed ratio;

[0027] Take half of the ratio of the measured wind speed ratio corresponding to the target laser frequency in any direction to the measured zero wind speed ratio as the normalized wind speed ratio corresponding to the target laser frequency in that any direction.

[0028] In an alternative implementation, obtaining the first measured wind speed ratio corresponding to the target laser frequency in the first direction includes:

[0029] Determine the number of photons received by the measurement channel corresponding to the target laser frequency and the number of photons received by the reference channel in the first direction;

[0030] Take the ratio of the number of photons received by the measurement channel to the number of photons received by the reference channel as the first measured wind speed ratio corresponding to the target laser frequency in the first direction.

[0031] In an alternative implementation, the method for obtaining the preset target look-up table includes:

[0032] Obtain the backscattering spectrum of atmospheric molecules and the backscattering spectrum of aerosols;

[0033] Convolve the transmittance curve of the iodine molecular filter with the backscattering spectrum of the atmospheric molecules to obtain a first response spectrum;

[0034] Convolve the transmittance curve of the iodine molecular filter with the backscattering spectrum of the aerosol to obtain a second response spectrum;

[0035] Based on a plurality of preset aerosol backscattering ratios, the first response spectrum, the second response spectrum, and the normalized wind speed ratio formula, obtain an initial look-up table;

[0036] Extract the look-up table in the initial look-up table corresponding to the actual atmospheric radial wind speed range as the target look-up table.

[0037] The second aspect of the present application discloses a device for determining the measured radial wind speed and aerosol backscattering ratio, the device includes:

[0038] A target look-up table determination module for determining a preset target look-up table; the target look-up table indicates the corresponding relationship between the normalized wind speed ratio, the radial wind speed, and the aerosol backscattering ratio;

[0039] A normalized wind speed ratio acquisition module for acquiring N normalized wind speed ratios corresponding to N laser pulses of different frequencies; the N laser pulses of different frequencies correspond one-to-one with the N normalized wind speed ratios; N is an integer greater than or equal to 2; the N laser pulses of different frequencies are emitted by the same light source within a target time range;

[0040] A projection curve acquisition module for determining N projection curves based on the target look-up table and the N normalized wind speed ratios; the N normalized wind speed ratios correspond one-to-one with the N projection curves; the projection curve indicates the corresponding relationship between the aerosol backscattering ratio and the radial wind speed;

[0041] A target data acquisition module for determining the radial wind speed and aerosol backscattering ratio corresponding to the target time range based on the N projection curves.

[0042] The third aspect of the present application provides a computer-readable storage medium, on which a computer program is stored, and when the program is executed by a processor, the steps of the method described in any implementation manner of the first aspect are implemented.

[0043] The fourth aspect of the present application provides an electronic device, including:

[0044] A memory, on which a computer program is stored;

[0045] A processor for executing the computer program in the memory to implement the steps of the method described in any implementation manner of the first aspect.

[0046] Compared with the prior art, the present application has the following beneficial effects:

[0047] The present application discloses a method for synchronously determining the radial wind speed and the aerosol backscattering ratio, including: obtaining N normalized wind speed ratios corresponding to N laser pulses with different frequencies; determining N projection curves based on a preset target look-up table and the N normalized wind speed ratios; and determining the radial wind speed and the aerosol backscattering ratio within a target time range based on the N projection curves. Since N laser pulses with different frequencies emitted by the same light source within the target time period are used to obtain the corresponding N normalized wind speed ratios, the diversity of data is ensured, facilitating the capture of more comprehensive aerosol and wind speed information; and since a preset target look-up table that details the complex correspondence between the normalized wind speed ratio, the radial wind speed, and the aerosol backscattering ratio is utilized, it is ensured that N relatively accurate projection curves can be obtained without a large amount of real-time calculation; finally, based on the relationship between the N projection curves, the radial wind speed and the aerosol backscattering ratio are synchronously determined; and then, by using the method for calculating the wind profile based on the radial wind speed in the traditional scheme, the wind profile can be obtained; solving the asynchronous problem existing in measuring the wind profile and the aerosol backscattering ratio in the traditional scheme, and greatly improving the measurement accuracy and efficiency. BRIEF DESCRIPTION OF THE DRAWINGS

[0048] In order to more clearly illustrate the technical solutions in the embodiments of the present application or the prior art, the following will briefly introduce the drawings required for use in the description of the embodiments or the prior art. Obviously, the following drawings are only some embodiments of the present application, and those of ordinary skill in the art can obtain other drawings without creative efforts based on these drawings.

[0049] Figure 1 It is a flowchart of a method for synchronously determining the radial wind speed and the aerosol backscattering ratio provided by an embodiment of the present application;

[0050] Figure 2 It is a schematic diagram of a response spectrum provided by an embodiment of the present application; wherein, Figure 2 in (a) is a schematic diagram of the response spectrum obtained by convolution at zero wind speed, Figure 2 in (b) is a schematic diagram of the response spectrum obtained by convolution at a non-zero wind speed;

[0051] Figure 3 It is a schematic diagram of a response surface drawn based on an initial look-up table provided by an embodiment of the present application;

[0052] Figure 4 It is a schematic diagram of the relationship between the laser frequency and the normalized transmittance provided by an embodiment of the application;

[0053] Figure 5A It is a schematic diagram of the process of determining a projection curve based on a preset target look-up table and a normalized wind speed ratio provided by an embodiment of the present application;

[0054] Figure 5B A schematic diagram of another process for determining a projection curve based on a preset target lookup table and a normalized wind speed ratio provided by an embodiment of the present application;

[0055] Figure 5C A schematic diagram of still another process for determining a projection curve based on a preset target lookup table and a normalized wind speed ratio provided by an embodiment of the present application;

[0056] Figure 6 A schematic diagram of the positional relationship of three projection curves provided by an embodiment of the present application; wherein, Figure 6 in (a) is a schematic diagram of the positional relationship after smoothing the three projection curves; Figure 6 in (b) is a schematic diagram of a triangle constructed with the intersection points of the pairwise intersections of the three projection curves as vertices;

[0057] Figure 7 A schematic diagram of the structure of a synchronous measurement device provided by an embodiment of the present application. Detailed implementation manners

[0058] As described above, there is an interaction between the wind profile and the aerosol backscatter ratio. By deeply studying the relationship between them, the relevant laws of the atmospheric environment and meteorology can be further understood, providing a scientific basis for fields such as environmental protection, climate change response, and energy development. However, in the traditional solution, there is a problem of asynchronous measurement of the wind profile and the aerosol backscatter ratio.

[0059] Based on this, the present application discloses a method for synchronously determining the radial wind speed and the aerosol backscatter ratio, including: obtaining N normalized wind speed ratios corresponding to N laser pulses of different frequencies; determining N projection curves based on a preset target lookup table and the N normalized wind speed ratios; determining the radial wind speed and the aerosol backscatter ratio within a target time range based on the N projection curves. Since N laser pulses of different frequencies emitted by the same light source within the target time period are used to obtain the corresponding N normalized wind speed ratios, the diversity of data is ensured, facilitating the capture of more comprehensive aerosol and wind speed information; and since a preset target lookup table that details the complex corresponding relationship between the normalized wind speed ratio, the radial wind speed, and the aerosol backscatter ratio is used, it is ensured that N relatively accurate projection curves can be obtained without a large amount of real-time calculation; finally, based on the relationship between the N projection curves, the radial wind speed and the aerosol backscatter ratio are synchronously determined; and then using the method for calculating the wind profile based on the radial wind speed in the traditional solution, the wind profile can be obtained; solving the asynchronous problem existing in the measurement of the wind profile and the aerosol backscatter ratio in the traditional solution, and greatly improving the measurement accuracy and efficiency.

[0060] To facilitate the understanding of the technical solutions in this application, the technical terms involved in this application are explained first.

[0061] The wind profile is the curve of the variation of wind speed with height and is an important parameter in the fields of meteorology, atmospheric science, and environmental science; it can be used to improve the accuracy of numerical weather forecasting, evaluate the potential of wind energy resources, and understand the diffusion of atmospheric pollutants.

[0062] The radial wind speed is the wind speed component in the direction of the radius vector at a certain point from the center of the circulation wind system, describing the wind speed component in a specific direction; it can be regarded as the corresponding value of the wind profile at a certain height; after obtaining multiple radial wind speeds, the corresponding wind profile can be obtained.

[0063] The aerosol backscatter ratio is the ratio of the aerosol backscatter coefficient to the total scatter coefficient and is a key parameter for evaluating the optical properties and environmental impacts of aerosols. It can be used to evaluate the air quality status, understand the scattering, absorption, and radiation effect characteristics of aerosols, and understand the mechanism of the role of aerosols in climate change.

[0064] The transmittance curve of the iodine molecular filter is the curve describing the variation of the transmittance of the iodine molecular filter for light of different frequencies. It is usually used in lidar systems, especially in wind-measuring lidar, to selectively transmit light of a specific frequency, thereby achieving the accurate measurement of atmospheric wind speed.

[0065] The wind-measuring lidar works based on the Doppler effect. It emits laser pulses of a specific wavelength, and these pulses propagate in the air and interact with particles such as aerosols. Among them, part of the scattered light will be received by the radar system. The system calculates the distance based on the round-trip time of the light and analyzes the frequency change of the scattered light to determine the wind speed. Due to the good directivity of the laser, the measurement is more accurate, and the device is extremely sensitive to small changes in the atmosphere and can measure wind field structures of different scales.

[0066] To enable those skilled in the art to better understand the solutions of this application, the technical solutions in the embodiments of this application will be clearly and completely described below in conjunction with the accompanying drawings in the embodiments of this application. Obviously, the described embodiments are only part of the embodiments of this application, rather than all the embodiments. Based on the embodiments in this application, all other embodiments obtained by those of ordinary skill in the art without creative efforts shall fall within the protection scope of this application.

[0067] Figure 1 It is a flowchart of a method for synchronously determining the radial wind speed and the aerosol backscatter ratio provided for the embodiments of this application. In combination with Figure 1 As shown, the method for synchronously determining the radial wind speed and the aerosol backscatter ratio disclosed in this application includes:

[0068] S101. Determine a preset target lookup table.

[0069] In this application, the target lookup table indicates the correspondence between the normalized wind speed ratio, the radial wind speed, and the aerosol backscattering ratio. Before measuring the radial wind speed and the aerosol backscattering ratio, it is necessary to construct the target lookup table.

[0070] In an alternative implementation, the steps of constructing the target lookup table include:

[0071] First, obtain the backscattering spectrum of atmospheric molecules and the backscattering spectrum of aerosols.

[0072] Exemplarily, based on the S6 scattering model, the backscattering spectrum Im(v) of atmospheric molecules can be calculated. Among them, the S6 scattering model is a mathematical model used to describe the Rayleigh-Brillouin scattering envelope spectrum of gases, which is well-known to those skilled in the art and will not be elaborated further in this application.

[0073] Exemplarily, based on formula (1), the backscattering spectrum of aerosols can be calculated. Among them, the expression of formula (1) is:

[0074] (1)

[0075] In formula (1), va is the difference between the scattered light frequency and the incident laser frequency, △v is the full width at half maximum of the Gaussian line shape, λ is the laser wavelength, k is the Boltzmann constant, T is the measured or atmospheric model temperature (K), m is the molecular mass (kg); Ia(v) is the backscattering spectrum of aerosols.

[0076] Secondly, calculate the first response spectrum through the backscattering spectrum of atmospheric molecules, and calculate the second response spectrum through the backscattering spectrum of aerosols.

[0077] Specifically, after determining the transmittance curve of the iodine molecular filter, convolve the transmittance curve of the iodine molecular filter with the backscattering spectrum of atmospheric molecules to calculate the first response spectrum of the backscattering spectrum of atmospheric molecules at a distance r from the ground after passing through the iodine molecular absorption filter; in this application, the first response spectrum is denoted as f m (v).

[0078] At the same time, convolve the transmittance curve of the iodine molecular filter with the backscattering spectrum of aerosols to calculate the second response spectrum of the backscattering spectrum of aerosols at a distance r from the ground after passing through the iodine molecular absorption filter; in this application, the second response spectrum is denoted as f a (v).

[0079] Among them, the expressions of f m (v) and f a (v) are as shown in formula (2):

[0080] (2)

[0081] In formula (2), r is the distance from the ground; v is the frequency of the laser pulse emitted by the detection device; f m (v) is the first response spectrum, f a (v) is the second response spectrum; H(v) is the transmittance curve of the iodine molecular filter; v' is the frequency shift of the laser pulse frequency due to the existence of wind speed in the atmosphere; I m (r, v - v') is the backscattering spectrum of atmospheric molecules corresponding to the frequency of v - v' at r; I a (r, v - v') is the backscattering spectrum of aerosols corresponding to the frequency of v - v'.

[0082] It should be noted that to ensure that the spectral frequency range covers all possible wind speed conditions in the atmosphere, the frequency setting in the convolution process needs to be wide enough.

[0083] Figure 2 This is a schematic diagram of a response spectrum provided by an embodiment of the present application. Figure 2 It shows a schematic diagram of convolving the backscattering spectrum of atmospheric molecules using the transmittance curve of the iodine molecular filter, and convolving the backscattering spectrum of aerosols using the transmittance curve of the iodine molecular filter. Figure 2 In (a) and (b), the abscissa represents frequency, the left ordinate represents normalized transmittance, and the right ordinate represents normalized intensity. Figure 2 The solid line in it is the Rayleigh - Mie backscattering spectrum. The part indicated by atmospheric molecules in the Rayleigh - Mie backscattering spectrum is the backscattering spectrum of atmospheric molecules, and the part indicated by aerosols is the backscattering spectrum of aerosols; Figure 2 The dashed line in it is the transmittance curve of the iodine molecular filter ( Figure 2 the iodine line in it), and the result after convolution is Figure 2 the shaded area near the horizontal axis shown in it. Among them, Figure 2 (a) in it represents the convolution result at zero wind speed, Figure 2 (b) in it represents the convolution result at non - zero wind speed.

[0084] Thirdly, based on a preset plurality of aerosol backscattering ratios, the first response spectrum, the second response spectrum, and the normalized wind speed ratio formula, an initial look - up table is obtained.

[0085] In the iodine molecular filter lidar system, the normalized wind speed ratio formula is as shown in formula 3.

[0086] (3)

[0087] The aerosol backscattering ratio Rb is defined as shown in Equation (4):

[0088] (4)

[0089] The meanings of the letters in Equation (3) and Equation (4) are as follows: NWR represents the normalized wind speed ratio, f a (v) represents the second response spectrum; f a (v 0 ) represents the second response spectrum at zero wind speed; f m (r, v) represents the first response spectrum at a height of r from the ground; f m (r, v 0 ) represents the first response spectrum at a height of r from the ground and at zero wind speed; β a (r) is the aerosol backscattering coefficient at a height of r from the ground, β m (r) is the atmospheric molecular backscattering coefficient at a height of r from the ground; R b (r) is the aerosol backscattering ratio at a height of r from the ground.

[0090] Due to the existence of the radial wind speed in the atmosphere, the backscattering spectra I m (v) of atmospheric molecules and the backscattering spectrum I a (v) of aerosols carry information on the Doppler shift. Correspondingly, the first response spectrum f m (r, v) and the second response spectrum f a (v) also carry information on the Doppler shift. When a series of empirical values are assigned to R b (r), the relationship between the normalized wind speed ratio and the Doppler shift corresponding to different R b (r) can be calculated from Equation (3) and Equation (4).

[0091] The working principle of the wind lidar is related to the Doppler effect. Specifically, when atmospheric molecules or aerosol particles move as a whole with a radial wind speed v 径向风速 , a single-frequency laser with a wavelength of λ 波长 and a frequency of f 频率 scatters off the moving atmospheric molecules or aerosol particles, and the frequency of the scattered light will undergo a Doppler shift Δf 频移 , and the magnitude of the Doppler shift is proportional to the radial wind speed v 径向风速 , as shown in Equation (4-1):

[0092] (4-1)

[0093] In Equation (4-1), c is the speed of light, and the meanings of the other letters are as described above. Rb The relationship between the normalized wind speed ratio corresponding to (r) and the Doppler frequency shift can be transformed into the relationship between the normalized wind speed ratio corresponding to different R b and the radial wind speed corresponding to (r), obtaining the initial lookup table.

[0094] Figure 3 It is a schematic diagram of a response surface drawn based on the initial lookup table provided by the embodiment of the present application. Figure 3 The meanings of the three coordinate systems in it are: radial wind speed, aerosol backscattering ratio, and normalized wind speed ratio. Combining Figure 3 as shown, at each altitude layer (at different altitudes from the ground), for each laser pulse corresponding to each laser frequency, a response surface can be drawn. Figure 3 It represents the response surface at a height of 5 km with a laser wavelength of 532.25935 nm.

[0095] In the fourth step, the lookup table corresponding to the actual atmospheric radial wind speed range in the initial lookup table is extracted as the target lookup table.

[0096] That is, the lookup table in the initial lookup table that can cover the radial wind speed range that may exist in the actual atmosphere is extracted as the target lookup table.

[0097] Since the horizontal wind speed in the tropospheric atmospheric wind field usually does not exceed 100 m / s, based on the corresponding relationship between the horizontal wind speed and the radial wind speed, it can be known that the radial wind speed in the tropospheric atmospheric wind field is about ±33 m / s; to avoid invalid data values that deviate from the actual situation in subsequent lookup processes, the present application extracts the part of the initial lookup table that covers the radial wind speed range of -35 to 35 m / s as the target lookup table.

[0098] S102, obtain N normalized wind speed ratios corresponding to N laser pulses with different frequencies.

[0099] Among them, the N laser pulses with different frequencies correspond one-to-one with the N normalized wind speed ratios.

[0100] The N laser pulses with different frequencies in the present application are laser pulses emitted by the same light source within the target time range. For example, the N laser pulses with different frequencies can be the laser emitted by the laser after passing through different acousto-optic modulators, or the N laser pulses with different frequencies emitted after adjusting the driving signal of the same acousto-optic modulator.

[0101] It should be noted that N laser pulses with different frequencies emitted by the same light source in this application are alternately emitted externally. Since the switching speed of the drive signal is very fast, the laser pulses corresponding to each frequency are alternately emitted at extremely short time intervals. The normalized wind speed ratios corresponding to the laser pulses of each frequency can be regarded as the normalized wind speed ratios obtained within the same target time range or even at the same moment.

[0102] Among them, N in this application is an integer greater than or equal to 2; that is, the value of N can be 2, can be 3, or can be 4. However, considering that the results of the radial wind speed and aerosol backscattering ratio measured by 2 laser pulses are inaccurate, and based on obtaining data with more than 4 laser pulses, 4 look-up tables are required at each altitude, the process of calculating the radial wind speed and aerosol backscattering ratio is too cumbersome, and the memory occupancy of the look-up table is large and the calculation speed is slow. In view of the balance between the accuracy of the calculation results and the complexity of the calculation process, the value of N in this application is 3, that is, the method of alternately emitting laser pulses of three frequencies is adopted in the application to synchronously determine the radial wind speed and aerosol backscattering ratio.

[0103] Figure 4 It is a schematic diagram showing the relationship between the laser frequency and the normalized transmittance provided for the application embodiment. The situations of the normalized transmittances of the three laser frequencies A point, B point, and C point in this application on the iodine 1109 line are as Figure 4 shown. Among them, the emission wavelength corresponding to the frequency of point A is 532.25935 nm, the emission wavelength corresponding to the frequency of point B is 532.25955 nm, and the emission wavelength corresponding to the frequency of point C is 532.26130 nm. In subsequent embodiments, the method for synchronously determining the radial wind speed and aerosol backscattering ratio disclosed in this application will be introduced by taking three laser frequencies as an example.

[0104] To facilitate understanding of the acquisition process of the normalized wind speed ratio corresponding to each frequency (also referred to as the measured normalized wind speed ratio), in this application, taking the target laser frequency as an example, the acquisition steps of the normalized wind speed ratio corresponding to the target laser frequency are introduced. The target laser frequency is any one of multiple different laser frequencies.

[0105] In an optional implementation manner, the acquisition steps of the normalized wind speed ratio corresponding to the target laser frequency include:

[0106] The first step is to determine a first direction and a second direction that is opposite to the first direction.

[0107] For example, if the first direction is the due east direction, then the second direction is the due west direction; if the first direction is the due south direction, then the second direction is the due north direction.

[0108] In the second step, obtain the first measured wind speed ratio corresponding to the target laser frequency in the first direction and the second measured wind speed ratio corresponding to the target laser frequency in the second direction.

[0109] In this application, the due east direction is the first direction; the due west direction is the second direction; Figure 4 Taking the frequency corresponding to point A in [[ ]] as the target laser frequency as an example, the process of obtaining the first measured wind speed ratio corresponding to the target laser frequency in the first direction, that is, the due east direction, is described as follows. This process is specifically as follows:

[0110] According to the lidar equation, measure the number of photons received by the measurement channel and the number of photons received by the reference channel at the target laser frequency in the due east direction. Among them, the number of photons received by the measurement channel and the number of photons received by the reference channel are shown in formula (5). Formula (5) is specifically as follows:

[0111] (5)

[0112] In formula (5), K M is the system constant of the measurement channel of the lidar; K R is the system constant of the reference channel of the lidar; A is the receiving area of the lidar system; r is the height from the ground; f a (v) represents the second response spectrum; β a (r) is the aerosol backscattering coefficient at a height of r from the ground; f m (r, v) represents the first response spectrum at a height of r from the ground; β m (r) is the atmospheric molecular backscattering coefficient at a height of r from the ground; α a (v') is the atmospheric aerosol extinction ratio; α m (v') is the atmospheric molecular extinction ratio; r' is the integration step; △r is the lidar system detection range resolution; N M (r, v) represents the number of photons received by the measurement channel of the lidar; N R (r) represents the number of photons received by the reference channel of the lidar.

[0113] After obtaining the number of photons received by the measurement channel and the number of photons received by the reference channel at the target laser frequency in the due east direction, the first measured wind speed ratio corresponding to the target laser frequency can be obtained based on formula (6). Formula (6) is specifically as follows:

[0114] (6)

[0115] In formula (6), N M (r, v) represents the number of photons received by the measurement channel of the lidar; N R(r) represents the number of photons received by the lidar reference channel; R M (r, v) is the measured wind speed ratio.

[0116] Thus, after determining that the first direction is the due east direction and the target laser frequency is Figure 4 the laser frequency corresponding to point A in, the first measured wind speed ratio corresponding to the target laser frequency in the due east direction can be determined based on Formula (5) and Formula (6).

[0117] Similarly, those skilled in the art can refer to the above method to obtain the second measured wind speed ratio corresponding to the target laser frequency in the second direction, i.e., the due west direction.

[0118] It can be understood that when using the three laser frequencies shown in Figure 4 to alternately emit and determine the radial wind speed and aerosol backscattering ratio, the laser pulse corresponding to the laser frequency at point A can be used to scan for 30 s first, then frequency-modulated to the laser pulse corresponding to the laser frequency at point B to scan for 30 s, and then frequency-modulated to point C to scan for 30 s. The number of photons received by the measurement channel and the number of photons received by the reference channel will be returned for each frequency point. Then, substituting the number of photons of the measurement channel and the number of photons of the reference channel corresponding to each frequency point into Formula (6), the measured wind speed ratio corresponding to each frequency point can be obtained.

[0119] In the third step, the mean value of the first measured wind speed ratio and the second measured wind speed ratio is used as the measured zero wind speed ratio.

[0120] After obtaining the first measured wind speed ratio corresponding to the target laser frequency in the first direction (due east direction) and the second measured wind speed ratio corresponding to the target laser frequency in the second direction (due west direction) by using the foregoing method, the mean value of the measured wind speed ratio in the first direction and the measured wind speed ratio in the second direction is used as the measured zero wind speed ratio corresponding to the target laser frequency.

[0121] It should be noted that the reason for using the mean value of the measured wind speed ratio in the first direction and the measured wind speed ratio in the second direction as the measured zero wind speed ratio corresponding to the target laser frequency in this application is as follows:

[0122] When the wind lidar measures the wind profile, it measures at a certain elevation angle θ in the four directions of east, south, west, and north; the measured wind speed ratios in each direction are as shown in Formula (7):

[0123] (7)

[0124] In Formula (7), R W,i represents the measured wind speed ratio in the i direction; E is the due east direction, S is the due south direction, W is the due west direction, N is the due north direction; r 0 is the zero wind speed value; △r h,iis the ratio change caused by the horizontal component of the radial wind speed in the i direction; △r v,i is the ratio change caused by the vertical component of the radial wind speed in the i direction.

[0125] Taking the two symmetric directions of east and west as an example, when the measured elevation angles are equal, assuming the state of the horizontal uniformity (wind field, temperature field, and aerosol distribution) of the atmosphere during the scanning measurement, the zero-wind-speed ratio in the east direction is equal to the zero-wind-speed ratio in the west direction, the vertical component in the east direction is equal to the vertical component in the west direction, and the horizontal component in the east direction is equal to the negative of the horizontal component in the west direction.

[0126] Since the laser beam is always in the atmospheric wind field, the wind speed ratio at zero wind speed cannot be directly obtained from the measurement signal returned from a single direction. To obtain the zero-wind-speed ratio, in this application, after scanning for 30 s each in the order of A - B - C in the east direction Figure 4 , the wedge mirror is then rotated to the west direction by the motor and scanned for 30 s each in the order of C - B - A. That is, for the target frequency, it is scanned for 30 s in the due east direction, and then the wedge mirror is rotated to the due west direction by the motor and scanned for 30 s.

[0127] Adding the measured wind speed ratios measured in the two directions can obtain Equation (8). Equation (8) is as follows:

[0128] (8)

[0129] In Equation (8), R M,E represents the measured wind speed ratio of the target laser frequency in the due east direction, that is, the first measured wind speed ratio; R W,W represents the measured wind speed ratio of the target laser frequency in the due west direction, that is, the second measured wind speed ratio; r 0 represents the measured zero-wind-speed ratio corresponding to the target laser frequency; △r v represents the vertical component of the radial wind speed in the east direction

[0130] Since △r v is very small compared with the zero-wind-speed ratio r 0 , assuming it can be ignored, Equation (9) can be obtained from Equation (8):

[0131] (9)

[0132] For the meanings of the letters in Equation (9), refer to the introduction in Equation (8), which will not be elaborated here. Through the above analysis, it can be known that the average value of the measured wind speed ratio (the first measured wind speed ratio) corresponding to the target laser frequency in the first direction and the measured wind speed ratio (the second measured wind speed ratio) corresponding to the target laser frequency in the second direction can be used as the measured zero-wind-speed ratio corresponding to the target laser frequency.

[0133] Step 4: Take half of the ratio of the measured wind speed ratio to the measured zero wind speed ratio corresponding to the target laser frequency in any direction as the normalized wind speed ratio corresponding to the target laser frequency in that any direction.

[0134] After obtaining the measured zero wind speed ratio corresponding to the target laser frequency, any direction can be obtained. For example, in the due east direction, the measured wind speed ratio corresponding to the target laser frequency is obtained, and then the above values are substituted into formula (10) to obtain the normalized wind speed ratio corresponding to the target laser frequency in the due east direction. Formula (10) is specifically:

[0135] (10)

[0136] In formula (10), NWR represents the normalized wind speed ratio, r 0 represents the measured zero wind speed ratio corresponding to the target laser frequency; R W,E (r, v)represents the measured wind speed ratio of the target laser frequency in the due east direction; v represents the target laser frequency; r represents the height from the ground.

[0137] It can be understood that the target laser frequency in this application is Figure 4 any one of the three laser frequencies shown in. During the process of measuring the wind profile using lidar, for each laser frequency used in the lidar, the method introduced in this application can be adopted to calculate the normalized wind speed ratio corresponding to that laser frequency. That is, if N laser frequencies are used, N normalized wind speed ratios can be obtained. Each laser frequency corresponds to a normalized wind speed ratio.

[0138] S103. Based on the target look-up table and the N normalized wind speed ratios, determine N projection curves.

[0139] First, after obtaining the target look-up table and the N normalized wind speed ratios, determine the acceptable tolerance, that is, determine the preset allowable error. Exemplarily, in this application, 0.001 is used as the preset allowable error.

[0140] Then, based on the N normalized wind speed ratios and the preset allowable error, determine N sets of target normalized wind speed ratios. Among them, the N normalized wind speed ratios correspond one-to-one with the N sets of target normalized wind speed ratios; the normalized wind speed ratios in the set of target normalized wind speed ratios are the normalized wind speed ratios in the target look-up table.

[0141] Exemplarily, after obtaining Figure 4 the values of the normalized wind speed ratios corresponding to the three frequency points A, B, and C in, that is, obtaining NWR A , NWR B and NWR C values, based on the value of the normalized wind speed ratio corresponding to frequency point A, NWRA and the preset redundancy error of 0.0001, determine at least one normalized wind speed ratio recorded in the target lookup table NWR 1 in, whose absolute value of the difference from NWR A is less than 0.0001 as the target normalized wind speed ratio set corresponding to frequency point A; based on the value NWR of the normalized wind speed ratio corresponding to frequency point B B and the preset redundancy error of 0.0001, determine at least one normalized wind speed ratio recorded in the target lookup table NWR 2 in, whose absolute value of the difference from NWR B is less than 0.0001 as the target normalized wind speed ratio set corresponding to frequency point B; based on the value NWR of the normalized wind speed ratio corresponding to frequency point C C and the preset redundancy error of 0.0001, determine at least one normalized wind speed ratio recorded in the target lookup table NWR 3 in, whose absolute value of the difference from NWR C is less than 0.0001 as the target normalized wind speed ratio set corresponding to frequency point C.

[0142] It can be understood that if N = 3, that is, 3 laser pulses are used to measure the radial wind speed and aerosol backscattering ratio, then there are also three corresponding target lookup tables, and each frequency corresponds to a corresponding target lookup table.

[0143] Finally, based on the N target normalized wind speed ratio sets and the target lookup tables, determine N initial projection curves; smooth each initial projection curve to obtain N projection curves.

[0144] Among them, the N target normalized wind speed ratio sets correspond one-to-one with the N projection curves.

[0145] Taking the target normalized wind speed ratio set corresponding to frequency A as an example, taking the value of the normalized wind speed ratio in the target normalized wind speed ratio set corresponding to frequency A as a determined value, determine the radial wind speed and aerosol backscattering ratio corresponding to each normalized wind speed ratio in the target normalized wind speed ratio set corresponding to frequency A from the target lookup table, and then obtain the curve corresponding to frequency point A; project this curve onto the plane with the aerosol backscattering ratio on the horizontal axis and the radial wind speed on the vertical axis to obtain the initial projection curve corresponding to frequency point A; smooth this initial projection curve to obtain the projection curve corresponding to frequency A.

[0146] Similarly, the projection curve corresponding to frequency point B and the projection curve corresponding to frequency point C can be obtained.

[0147] Figure 5A 、 Figure 5B and Figure 5CSchematic diagram of the process for determining the projection curve provided by the embodiments of the present application based on a preset target lookup table and a normalized wind speed ratio. Figure 5A The inclined surface of is a schematic diagram obtained by plotting each data in the lookup table corresponding to frequency point A. Figure 5A The gray plane of (the plane indicated by NWR A is the set of target normalized wind speed ratios corresponding to frequency point A. Figure 5B The inclined surface of is a schematic diagram obtained by plotting each data in the lookup table corresponding to frequency point B. Figure 5B The gray plane of (the plane indicated by NWR B is the set of target normalized wind speed ratios corresponding to frequency point B. Figure 5C The inclined surface of is a schematic diagram obtained by plotting each data in the lookup table corresponding to frequency point C. Figure 5C The gray plane of (the plane indicated by NWR C is the set of target normalized wind speed ratios corresponding to frequency point C.

[0148] Figure 5A The NWR in A is the normalized wind speed ratio corresponding to frequency point A; Figure 5B The NWR in B is the normalized wind speed ratio corresponding to frequency point B; Figure 5C The NWR in C is the normalized wind speed ratio corresponding to frequency point C. Figure 5A 、 Figure 5B and Figure 5C The coordinates in are respectively: radial wind speed (VLos), aerosol backscattering ratio (Rb), and normalized wind speed ratio. Figure 5A The normalized wind speed ratio NWR on the vertical axis in 1 has a value range of 0.35 - 0.55; Figure 5B The normalized wind speed ratio NWR on the vertical axis in 2 has a value range of 0 - 1.2; Figure 5C The normalized wind speed ratio NWR on the vertical axis in 3 has a value range of 0.2 - 0.7.

[0149] It should be noted that by extracting the part of the surface in of the present application that can cover the range of radial wind speeds that may exist in the actual atmosphere, the inclined surface is obtained. Figure 3

[0150] S104. Based on the N projection curves, determine the radial wind speed and the aerosol backscattering ratio.

[0151] Figure 6 Schematic diagram of the positional relationship of three projection curves provided by the embodiments of the present application. Figure 6(a) and Figure 6 In (b), the horizontal axis is the aerosol backscatter ratio Rb, and the vertical axis is the radial wind speed VLos (i.e. Figure 6 radial speed in the ).

[0152] based on Figure 6 From the enlarged diagram in the upper right corner of (a), it can be seen that when the local area is enlarged, it can be clearly seen that each initial projection curve has obvious burrs; the reason for the obvious burrs in each curve is that in the process of determining the projection curve based on the normalized wind speed ratio and the target lookup table, there is a preset allowable error, resulting in the same aerosol backscatter ratio may correspond to multiple very close radial wind speeds. The appearance of burrs will cause the appearance of multiple intersections, which is very unfavorable to the final calculation accuracy.

[0153] In order to improve the accuracy of the calculation results, this application will smooth each initial projection curve. Figure 6 The three curves in (a) are the results of smoothing the initial projection curves. It can be seen that the three projection curves basically intersect each other (see Figure 6 The enlarged diagram in the upper right corner of (a)). Take the intersection points of the three curves as vertices and construct Figure 6 The triangle shown in (b). Figure 6 In (b), M is the incenter of the triangle and N is the center of the triangle.

[0154] Because the inclinations of the three curves are close, under different altitude conditions, although the shape of the triangle is different, it is an obtuse triangle as a whole. The circumcenter and orthocenter of the obtuse triangle are both located outside the triangle and have a large deviation, and the calculation results of the center and incenter of the obtuse triangle are more accurate. Under clear sky conditions or when the signal-to-noise ratio is relatively low, the radial wind speed corresponding to the incenter of the obtuse triangle is closer to the actual radial wind speed.

[0155] Based on the above reasons, after obtaining three projection curves, the intersection of every two projection curves in the three projection curves is used as the vertex to construct a target triangle in this application; the abscissa of the inner core of the target triangle is used as the radial wind speed, and the ordinate of the inner core is used as the aerosol backscatter ratio. In this way, the goal of synchronously measuring the radial wind speed and the aerosol backscatter ratio is achieved; by processing the radial wind speed, the wind profile can be obtained, thereby achieving the goal of synchronously measuring the wind profile and the aerosol backscatter ratio.

[0156] The above embodiments describe in detail the method of synchronously determining radial wind speed and aerosol backscatter ratio by using three-frequency laser pulses. It is understandable that those skilled in the art may also use two-frequency laser pulses or four-frequency laser pulses to synchronously determine radial wind speed and aerosol backscatter ratio.

[0157] Exemplarily, when using the method of synchronously determining the radial wind speed and aerosol backscattering ratio with laser pulses of two frequencies, and then using the method in the foregoing embodiment to determine the projection curves corresponding to the laser pulses of each of the two frequencies, the abscissa of the intersection point of the two projection curves can be used as the radial wind speed corresponding to the target time range, and the ordinate of this intersection point can be used as the aerosol backscattering ratio corresponding to the target time range.

[0158] Exemplarily, when using the method of synchronously determining the radial wind speed and aerosol backscattering ratio with laser pulses of four frequencies, and then using the method in the foregoing embodiment to determine the projection curves corresponding to the laser pulses of each of the four frequencies, a quadrilateral can be constructed with the intersection points of the four projection curves as vertices; based on the quadrilateral, the radial wind speed and aerosol backscattering ratio corresponding to the target time range are determined.

[0159] Based on the method of synchronously determining the radial wind speed and aerosol backscattering ratio disclosed in the foregoing embodiment, the present application also discloses a device for synchronously determining the radial wind speed and aerosol backscattering ratio. Figure 7 It is a schematic structural diagram of a synchronous measurement device provided by an embodiment of the present application. Combining Figure 7 As shown, the synchronous measurement device 700 includes:

[0160] A target look-up table determination module 701, configured to determine a preset target look-up table; the target look-up table indicates the corresponding relationship between the normalized wind speed ratio, the radial wind speed, and the aerosol backscattering ratio;

[0161] A normalized wind speed ratio acquisition module 702, configured to acquire N normalized wind speed ratios corresponding to N laser pulses of different frequencies; the N laser pulses of different frequencies correspond one-to-one with the N normalized wind speed ratios; N is an integer greater than or equal to 2; the N laser pulses of different frequencies are emitted by the same light source within the target time range;

[0162] A projection curve acquisition module 703, configured to determine N projection curves based on the target look-up table and the N normalized wind speed ratios; the N normalized wind speed ratios correspond one-to-one with the N projection curves; the projection curve indicates the corresponding relationship between the aerosol backscattering ratio and the radial wind speed;

[0163] A target data acquisition module 704, configured to determine the radial wind speed and aerosol backscattering ratio corresponding to the target time range based on the N projection curves.

[0164] In an alternative implementation, the target data acquisition module 704 includes:

[0165] A target triangle determination unit, configured to construct a target triangle with the intersection points of every two of the three projection curves as vertices;

[0166] A target parameter determination unit, configured to use the abscissa of the incenter of the target triangle as the radial wind speed corresponding to the target time range, and use the ordinate of the incenter as the aerosol backscattering ratio corresponding to the target time range.

[0167] In an optional implementation manner, the projection curve acquisition module 703 includes:

[0168] A normalized wind speed ratio set determination unit, configured to determine N target normalized wind speed ratio sets based on the N normalized wind speed ratios and a preset allowable error; the N normalized wind speed ratios correspond to the N target normalized wind speed ratio sets one by one; the normalized wind speed ratios in the target normalized wind speed ratio set are the normalized wind speed ratios in the target look-up table;

[0169] A projection curve determination unit, configured to determine the N projection curves based on the N target normalized wind speed ratio sets and the target look-up table; the N target normalized wind speed ratio sets correspond to the N projection curves one by one.

[0170] In an optional implementation manner, the projection curve determination unit includes:

[0171] An initial projection curve determination subunit, configured to determine N initial projection curves based on the N target normalized wind speed ratio sets and the target look-up table;

[0172] A projection curve determination subunit, configured to perform smoothing processing on each of the initial projection curves to obtain the N projection curves.

[0173] In an optional implementation manner, the normalized wind speed ratio acquisition module 702 includes:

[0174] A target direction determination unit, configured to determine a first direction and a second direction opposite to the first direction;

[0175] A wind speed ratio determination unit, configured to obtain a first measured wind speed ratio corresponding to the target laser frequency in the first direction, and a second measured wind speed ratio corresponding to the target laser frequency in the second direction;

[0176] A measured zero wind speed ratio determination unit, configured to use the mean value of the first measured wind speed ratio and the second measured wind speed ratio as the measured zero wind speed ratio;

[0177] A normalized wind speed ratio determination unit, configured to use half of the ratio of the measured wind speed ratio corresponding to the target laser frequency in any direction to the measured zero wind speed ratio as the normalized wind speed ratio corresponding to the target laser frequency in that any direction.

[0178] In an optional implementation manner, the wind speed ratio determination unit includes:

[0179] A photon number determination subunit, configured to determine the number of photons received by the measurement channel corresponding to the target laser frequency and the number of photons received by the reference channel in the first direction;

[0180] A measured wind speed determination subunit, configured to use the ratio of the number of photons received by the measurement channel to the number of photons received by the reference channel as the first measured wind speed ratio corresponding to the target laser frequency in the first direction.

[0181] In an optional implementation manner, the synchronous measurement device 700 further includes:

[0182] A spectrum determination module, configured to obtain the backscattering spectrum of atmospheric molecules and the backscattering spectrum of aerosols;

[0183] A first response spectrum determination module, configured to convolve the transmittance curve of the iodine molecular filter with the backscattering spectrum of the atmospheric molecules to obtain a first response spectrum;

[0184] A second response spectrum determination module, configured to convolve the transmittance curve of the iodine molecular filter with the backscattering spectrum of the aerosols to obtain a second response spectrum;

[0185] An initial look-up table determination module, configured to obtain an initial look-up table based on a preset plurality of aerosol backscattering ratios, the first response spectrum, the second response spectrum, and the normalized wind speed ratio formula;

[0186] A target look-up table determination module, configured to extract the look-up table corresponding to the actual radial wind speed range of the atmosphere from the initial look-up table as the target look-up table.

[0187] Based on the method and device for synchronously determining the radial wind speed and the aerosol backscattering ratio provided in the foregoing embodiments, correspondingly, the present application further provides a computer-readable storage medium, on which a computer program is stored, and when the program is executed by a processor, it implements some or all of the steps in the method for synchronously determining the radial wind speed and the aerosol backscattering ratio mentioned above.

[0188] Based on the method and device for synchronously determining the radial wind speed and the aerosol backscattering ratio provided in the foregoing embodiments, the present application further provides an electronic device, including:

[0189] A memory on which a computer program is stored;

[0190] A processor for executing the computer program in the memory to implement some or all of the steps in the method for synchronously determining the radial wind speed and the aerosol backscattering ratio provided in the foregoing embodiments.

[0191] It should be noted that the various embodiments in this specification are described in a progressive manner. For the same or similar parts among the various embodiments, reference can be made to each other. Each embodiment focuses on the differences from other embodiments. In particular, for the device embodiments, since they are basically similar to the method embodiments, the description is relatively simple. For the relevant parts, reference can be made to the partial description of the method embodiments. The device embodiments described above are only illustrative. The units described as separate components may or may not be physically separated, and the components referred to as units may or may not be physical units, that is, they may be located in one place or distributed to multiple network units. Some or all of the modules can be selected according to actual needs to achieve the purpose of the solution of this embodiment. Those of ordinary skill in the art can understand and implement it without creative efforts.

[0192] As described above, this is only a specific implementation manner of the present application, but the protection scope of the present application is not limited thereto. Any changes or substitutions that can be easily thought of by those skilled in the art within the technical scope disclosed in the present application should be covered by the protection scope of the present application. Therefore, the protection scope of the present application should be subject to the protection scope of the claims.

Claims

1. A method for synchronously determining radial wind speed and aerosol backscatter ratio, characterized in that: The method comprises: Determine a preset target lookup table; the target lookup table indicates the corresponding relationship between the normalized wind speed ratio, the radial wind speed and the aerosol backscattering ratio; Obtaining three normalized wind speed ratios corresponding to three laser pulses of different frequencies; the three laser pulses of different frequencies correspond to the three normalized wind speed ratios one by one; the three laser pulses of different frequencies are emitted externally by the same light source within a target time range; Based on the target lookup table and the three normalized wind speed ratios, three projection curves are determined; the three normalized wind speed ratios correspond to the three projection curves one by one; the projection curves indicate the corresponding relationship between the aerosol backscattering ratio and the radial wind speed; Taking the intersection of every two projection curves among the three projection curves as vertices, constructing a target triangle; The abscissa of the inner center of the target triangle is used as the radial wind speed corresponding to the target time range, and the ordinate of the inner center is used as the aerosol backscattering ratio corresponding to the target time range; The target laser frequency is the laser frequency corresponding to any one of the three laser pulses with different frequencies. The step of obtaining the normalized wind speed ratio corresponding to the target laser frequency includes: determining a first direction and a second direction opposite to the first direction; Acquire a first measured wind speed ratio corresponding to the target laser frequency in the first direction, and a second measured wind speed ratio corresponding to the target laser frequency in the second direction; Taking the average of the first measured wind speed ratio and the second measured wind speed ratio as the measured zero wind speed ratio; Half of the ratio of the measured wind speed ratio corresponding to the target laser frequency in any direction to the measured zero wind speed ratio is taken as the normalized wind speed ratio corresponding to the target laser frequency in the any direction.

2. The method according to claim 1, characterized in that The determining of three projection curves based on the target lookup table and the three normalized wind speed ratios includes: Based on the three normalized wind speed ratios and the preset allowable errors, three target normalized wind speed ratio sets are determined; the three normalized wind speed ratios correspond one-to-one to the three target normalized wind speed ratio sets; the normalized wind speed ratios in the target normalized wind speed ratio set are the normalized wind speed ratios in the target lookup table; The three projection curves are determined based on the three target normalized wind speed ratio sets and the target lookup table; the three target normalized wind speed ratio sets correspond one-to-one to the three projection curves.

3. The method according to claim 2, characterized in that The determining the three projection curves based on the three target normalized wind speed ratio sets and the target lookup table comprises: Determining three initial projection curves based on the three target normalized wind speed ratio sets and the target lookup table; Each of the initial projection curves is smoothed to obtain the three projection curves.

4. The method according to claim 1, characterized in that: The obtaining of a first measured wind speed ratio corresponding to the target laser frequency in the first direction includes: Determine the number of photons received by the measurement channel and the number of photons received by the reference channel corresponding to the target laser frequency in the first direction; The ratio of the number of photons received by the measurement channel to the number of photons received by the reference channel is used as the first measured wind speed ratio corresponding to the target laser frequency in the first direction.

5. The method according to claim 1, characterized in that The method for obtaining the preset target lookup table includes: Obtain backscatter spectra of atmospheric molecules and aerosols; Convolving the iodine molecule filter transmittance curve with the backscattering spectrum of the atmospheric molecules to obtain a first response spectrum; Convolving the iodine molecule filter transmittance curve with the backscattering spectrum of the aerosol to obtain a second response spectrum; Obtaining an initial lookup table based on a plurality of preset aerosol backscattering ratios, the first response spectrum, the second response spectrum, and a normalized wind speed ratio formula; A lookup table corresponding to the actual atmospheric radial wind speed range in the initial lookup table is extracted as the target lookup table.

6. A device for synchronously determining radial wind speed and aerosol backscatter ratio, characterized in that: The device comprises: A target lookup table determination module, used to determine a preset target lookup table; the target lookup table indicates the corresponding relationship between the normalized wind speed ratio, the radial wind speed and the aerosol backscattering ratio; A normalized wind speed ratio acquisition module is used to acquire three normalized wind speed ratios corresponding to three laser pulses of different frequencies; the three laser pulses of different frequencies correspond to the three normalized wind speed ratios one by one; the three laser pulses of different frequencies are emitted externally by the same light source within a target time range; the target laser frequency is the laser frequency corresponding to any one of the three laser pulses of different frequencies; The normalized wind speed ratio acquisition module is further used to determine a first direction and a second direction opposite to the first direction; obtain a first measured wind speed ratio corresponding to the target laser frequency in the first direction, and a second measured wind speed ratio corresponding to the target laser frequency in the second direction; use the average of the first measured wind speed ratio and the second measured wind speed ratio as the measured zero wind speed ratio; use half of the ratio of the measured wind speed ratio corresponding to the target laser frequency in any direction to the measured zero wind speed ratio as the normalized wind speed ratio corresponding to the target laser frequency in the any direction; A projection curve acquisition module, used to determine three projection curves based on the target lookup table and the three normalized wind speed ratios; the three normalized wind speed ratios correspond to the three projection curves one by one; the projection curves indicate the corresponding relationship between the aerosol backscattering ratio and the radial wind speed; The target data acquisition module is used to construct a target triangle with the intersection of every two projection curves in the three projection curves as vertices; the horizontal coordinate of the inner core of the target triangle is used as the radial wind speed corresponding to the target time range, and the vertical coordinate of the inner core is used as the aerosol backscattering ratio corresponding to the target time range.

7. A computer-readable storage medium having a computer program stored thereon, characterized in that: When the program is executed by a processor, the steps of the method described in any one of claims 1 to 5 are implemented.

8. An electronic device, characterized in that: include: a memory having a computer program stored thereon; A processor, configured to execute the computer program in the memory to implement the steps of the method according to any one of claims 1 to 5.

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