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

Abstract

The invention discloses a method for synchronously determining a radial wind speed and an aerosol backscattering ratio and a related device, and relates to the technical field of atmospheric exploration. Comprising the following steps: acquiring N normalized wind speed ratios corresponding to N laser pulses with different frequencies; determining N projection curves based on a preset target lookup table and the N normalized wind speed ratios; and based on the N projection curves, determining the radial wind speed and the aerosol backscattering ratio in the target time range. The N lasers with different frequencies emitted by the same light source in the target time period are adopted to obtain the corresponding N normalized wind speed ratios, so that the diversity of data is ensured; due to the fact that the preset target lookup table which records the complex corresponding relation among the normalized wind speed ratio, the radial wind speed and the aerosol back scattering ratio in detail is utilized, it is guaranteed that N accurate projection curves can be obtained without a large amount of real-time calculation; and according to the relationship among the N projection curves, the radial wind speed and the 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: In a first aspect, the present application discloses a method for synchronously determining radial wind speed and aerosol backscatter ratio, the method comprising: 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 N normalized wind speed ratios corresponding to N laser pulses of different frequencies; the N laser pulses of different frequencies correspond one to one to 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 externally by the same light source within a target time range; Based on the target lookup table and the N normalized wind speed ratios, N projection curves are determined; the N normalized wind speed ratios correspond one-to-one to the N projection curves; the projection curves indicate the corresponding relationship between the aerosol backscattering ratio and the radial wind speed; Based on the N projection curves, the radial wind speed and the aerosol backscattering ratio corresponding to the target time range are determined.

[0009] In an optional implementation, N is 3; and determining the radial wind speed and aerosol backscatter ratio corresponding to the target time range based on the N projection curves includes: The intersection of every two projection curves among the three projection curves is used as the vertex to construct the target triangle; The abscissa of the inner core of the target triangle is used as the radial wind speed corresponding to the target time range, and the ordinate of the inner core is used as the aerosol backscattering ratio corresponding to the target time range.

[0010] In an optional implementation, determining N projection curves based on the target lookup table and the N normalized wind speed ratios includes: Based on the N normalized wind speed ratios and a preset allowable error, N target normalized wind speed ratio sets are determined; the N normalized wind speed ratios correspond one-to-one to the N 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; Based on the N target normalized wind speed ratio sets and the target lookup table, the N projection curves are determined; the N target normalized wind speed ratio sets correspond one-to-one to the N projection curves.

[0011] In an optional implementation, determining the N projection curves based on the N target normalized wind speed ratio sets and the target lookup table includes: Determining N initial projection curves based on the N target normalized wind speed ratio sets and the target lookup table; Each of the initial projection curves is smoothed to obtain the N projection curves.

[0012] In an optional implementation, the target laser frequency is any one of N laser frequencies, and the step of acquiring 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.

[0013] In an optional implementation manner, obtaining 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.

[0014] In an optional implementation, 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.

[0015] The second aspect of the present application discloses a device for determining and measuring radial wind speed and aerosol backscatter ratio, the device comprising: 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, used to acquire N normalized wind speed ratios corresponding to N laser pulses of different frequencies; the N laser pulses of different frequencies correspond to the N normalized wind speed ratios one by one; N is an integer greater than or equal to 2; the N laser pulses of different frequencies are emitted externally by the same light source within a target time range; A projection curve acquisition module, used to determine N projection curves based on the target lookup table and the N normalized wind speed ratios; the N normalized wind speed ratios correspond one-to-one to the N projection curves; the projection curve indicates the corresponding relationship between the aerosol backscattering ratio and the radial wind speed; The target data acquisition module is used to determine the radial wind speed and aerosol backscattering ratio corresponding to the target time range based on the N projection curves.

[0016] A third aspect of the present application provides a computer-readable storage medium having a computer program stored thereon, which, when executed by a processor, implements the steps of the method introduced in any implementation manner of the first aspect.

[0017] A fourth aspect of the present application provides an electronic device, including: a memory having a computer program stored thereon; A processor is used to execute the computer program in the memory to implement the steps of the method introduced in any implementation manner of the first aspect.

[0018] Compared with the prior art, this application has the following beneficial effects: The present application discloses a method for synchronously determining radial wind speed and aerosol backscattering ratio, comprising: 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; and determining the radial wind speed and aerosol backscattering ratio within a target time range based on the N projection curves. Since the same light source is used to emit N lasers of different frequencies within the target time period to obtain the corresponding N normalized wind speed ratios, the diversity of data is guaranteed, making it easier to capture more comprehensive aerosol and wind speed information; and since a preset target lookup table that records in detail the complex correspondence between the normalized wind speed ratio, radial wind speed and aerosol backscattering ratio is used, it is guaranteed that N relatively accurate projection curves can be obtained without a large amount of real-time calculation; finally, according to the relationship between the N projection curves, the radial wind speed and the aerosol backscattering ratio are synchronously determined; and the wind profile can be obtained by using the method of calculating the wind profile based on the radial wind speed in the traditional scheme; the asynchronous problem existing in the measurement of the wind profile and the aerosol backscattering ratio in the traditional scheme is solved, and the measurement accuracy and efficiency are greatly improved. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] In order to more clearly illustrate the embodiments of the present application or the technical solutions in the prior art, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present application. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative labor.

[0020] Figure 1 A flow chart of a method for synchronously determining radial wind speed and aerosol backscatter ratio provided in an embodiment of the present application; Figure 2 A schematic diagram of a response spectrum provided in an embodiment of the present application; wherein, Figure 2 (a) is a schematic diagram of the response spectrum obtained by convolution at zero wind speed. Figure 2 (b) is a schematic diagram of the response spectrum obtained by convolution when there is wind speed; Figure 3 A schematic diagram of a response surface drawn based on an initial lookup table provided in an embodiment of the present application; Figure 4 A schematic diagram of the relationship between laser frequency and normalized transmittance provided for an embodiment of the application; Figure 5A A schematic diagram of a process of determining a projection curve based on a preset target lookup table and a normalized wind speed ratio provided in an embodiment of the present application; Figure 5B A schematic diagram of another process of determining a projection curve based on a preset target lookup table and a normalized wind speed ratio provided in an embodiment of the present application; Figure 5C A schematic diagram of another process of determining a projection curve based on a preset target lookup table and a normalized wind speed ratio provided in an embodiment of the present application; Figure 6 A schematic diagram of the positional relationship of three projection curves provided in an embodiment of the present application; wherein, Figure 6 (a) is a schematic diagram of the positional relationship of the three projection curves after smoothing; Figure 6 (b) is a schematic diagram of a triangle constructed with the intersection points of the three projection curves as vertices; Figure 7 A schematic diagram of the structure of a synchronous measurement device provided in an embodiment of the present application. DETAILED DESCRIPTION

[0021] As mentioned above, wind profiles and aerosol backscatter ratios affect each other. By deeply studying 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, energy development and other fields. However, there is a problem of asynchronous measurement of wind profiles and aerosol backscatter ratios in traditional schemes.

[0022] Based on this, the present application discloses a method for synchronously determining radial wind speed and aerosol backscattering 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; and determining the radial wind speed and aerosol backscattering ratio within a target time range based on the N projection curves. Since the same light source is used to emit N lasers of different frequencies within the target time period to obtain the corresponding N normalized wind speed ratios, the diversity of data is guaranteed, making it easier to capture more comprehensive aerosol and wind speed information; and since a preset target lookup table that records in detail the complex correspondence between the normalized wind speed ratio, radial wind speed and aerosol backscattering ratio is used, it is guaranteed that N relatively accurate projection curves can be obtained without a large amount of real-time calculation; finally, according to the relationship between the N projection curves, the radial wind speed and the aerosol backscattering ratio are synchronously determined; and the wind profile can be obtained by using the method of calculating the wind profile based on the radial wind speed in the traditional scheme; the asynchronous problem existing in the measurement of the wind profile and the aerosol backscattering ratio in the traditional scheme is solved, and the measurement accuracy and efficiency are greatly improved.

[0023] To facilitate understanding of the technical solutions in this application, the technical terms involved in this application are explained first.

[0024] 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.

[0025] The radial wind speed is the wind speed component along the radial vector direction at a certain point from the center of the circulating wind system, which describes the speed component of the wind 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.

[0026] 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.

[0027] The iodine molecular filter transmittance curve is a curve that describes the changes in the transmittance of the iodine molecular filter to 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 accurate measurement of atmospheric wind speed.

[0028] Wind laser radar works based on the Doppler effect. It emits laser pulses of a specific wavelength. These pulses propagate in the air and interact with particles such as aerosols. Some 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 changes of the scattered light to determine the wind speed. The laser has good directionality, making the measurement more accurate. The equipment is also extremely sensitive to small changes in the atmosphere and can measure wind field structures of different scales.

[0029] In order to enable those skilled in the art to better understand the solution of the present application, the technical solution in the embodiments of the present application will be clearly and completely described below in conjunction with the drawings in the embodiments of the present application. Obviously, the described embodiments are only part of the embodiments of the present application, not all of the embodiments. Based on the embodiments in the present application, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of this application.

[0030] Figure 1 A flowchart of a method for synchronously determining radial wind speed and aerosol backscatter ratio provided in an embodiment of the present application. Figure 1 As shown, the method for synchronously determining radial wind speed and aerosol backscatter ratio disclosed in the present application includes: S101, determining a preset target lookup table.

[0031] The target lookup table in this application indicates the corresponding relationship between the normalized wind speed ratio, the radial wind speed and the aerosol backscatter ratio. Before measuring the radial wind speed and the aerosol backscatter ratio, it is necessary to construct the target lookup table.

[0032] In an optional implementation, the step of constructing a target lookup table includes: First, the backscattering spectra of atmospheric molecules and aerosols are obtained.

[0033] For example, the backscattering spectrum Im(v) of the atmospheric molecules can be calculated based on the S6 scattering model, where the S6 scattering model is a mathematical model for describing the Rayleigh-Brillouin scattering envelope spectrum of a gas, which is well known to those skilled in the art and will not be described in detail in this application.

[0034] For example, the backscatter spectrum of the aerosol can be calculated based on formula (1), where the expression of formula (1) is: (1) In formula (1), va is the difference between the scattered light frequency and the incident laser frequency, △v is the half-maximum full width 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 the aerosol.

[0035] Secondly, a first response spectrum is calculated by the backscattering spectrum of the atmospheric molecules, and a second response spectrum is calculated by the backscattering spectrum of the aerosol.

[0036] Specifically, after determining the transmittance curve of the iodine molecule filter, the transmittance curve of the iodine molecule filter is convolved with the backscattering spectrum of the atmospheric molecules, and the first response spectrum of the backscattering spectrum of the atmospheric molecules at a distance r from the ground after passing through the iodine molecule absorption filter is calculated; in this application, the first response spectrum is denoted as f m (v).

[0037] At the same time, the transmittance curve of the iodine molecule filter is convolved with the backscattering spectrum of the aerosol, and the second response spectrum of the backscattering spectrum of the aerosol at a distance r from the ground after passing through the iodine molecule absorption filter is calculated; in this application, the second response spectrum is denoted as f a (v).

[0038] Among them, f m (v) and f a The expression of (v) is shown in formula (2): (2) 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 wind speed in the atmosphere; I m (r, vv') is the backscattering spectrum of the atmospheric molecules at r corresponding to the frequency vv'; I a (r, vv') is the backscattering spectrum of the aerosol corresponding to the frequency vv'.

[0039] It should be noted that in order 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.

[0040] Figure 2 A schematic diagram of a response spectrum provided in an embodiment of the present application. Figure 2The figure shows the convolution of the backscattering spectrum of atmospheric molecules using the iodine molecular filter transmittance curve, and the convolution of the backscattering spectrum of aerosol using the iodine molecular filter transmittance curve. Figure 2 In (a) and (b), the horizontal axis represents the frequency, the vertical axis on the left represents the normalized transmittance, and the vertical axis on the right represents the normalized intensity. Figure 2 The solid line in the middle 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 aerosol is the backscattering spectrum of aerosol; Figure 2 The middle dashed line is the transmittance curve of the iodine molecule filter ( Figure 2 The iodine line in the convolution is Figure 2 The shaded area close to the horizontal axis is shown in . Figure 2 (a) represents the convolution result at zero wind speed. Figure 2 Middle (b) represents the convolution result with wind speed.

[0041] The third step is to obtain an initial lookup table based on multiple preset aerosol backscattering ratios, first response spectra, second response spectra and normalized wind speed ratio formula.

[0042] In the iodine molecular filter lidar system, the normalized wind speed ratio formula is shown in Formula 3.

[0043] (3) Aerosol backscatter ratio R b The definition of is shown in formula (4): (4) The letters in formula (3) and formula (4) have the following meanings: NWR stands for normalized wind speed ratio, f a (v) represents the second response spectrum; f a (v0) represents the second response spectrum at zero wind speed; f m (r,v) represents the first response spectrum at a height r above the ground; f m (r,v0) represents the first response spectrum at a height r above the ground at zero wind speed; β a (r) is the aerosol backscatter coefficient at a height r above the ground, β m (r) is the backscattering coefficient of atmospheric molecules at a height r above the ground; R b (r) is the aerosol backscatter ratio at a height r above the ground.

[0044] Due to the existence of radial wind speed in the atmosphere, the backscattered spectrum of atmospheric molecules I m(v) and aerosol backscatter spectrum I a (v) carries the information of Doppler frequency shift. Accordingly, the first response spectrum f m (r, v) and the second response spectrum f a (v) also carries information about the Doppler frequency shift. b (r) is assigned a series of empirical values, and different R b (r) The relationship between the corresponding normalized wind speed ratio and Doppler frequency shift.

[0045] The working principle of wind laser radar is related to the Doppler effect. Specifically, atmospheric molecules or aerosol particles are affected by wind speed at a radial wind speed v 径向风速 When the whole body moves, the wavelength is λ 波长 , frequency is f 频率 The single-frequency laser is scattered by moving atmospheric molecules or aerosol particles, and the scattered light frequency will produce a Doppler frequency shift Δf 频移 , the magnitude of the Doppler shift is related to the radial wind speed v 径向风速 is proportional to, as shown in formula (4-1): (4-1) The c in formula (4-1) is the speed of light, and the meanings of other letters are as described above. b The relationship between the normalized wind speed ratio and Doppler frequency shift corresponding to (r) can be transformed into: b (r) The corresponding normalized wind speed ratio and radial wind speed, and the initial lookup table obtained.

[0046] Figure 3 A schematic diagram of a response surface drawn based on an initial lookup table provided in an embodiment of the present application. Figure 3 The meanings of the three coordinate systems are: radial wind speed, aerosol backscatter ratio and normalized wind speed ratio. Figure 3 As shown, at each altitude layer (at different heights from the ground), a response surface can be drawn for each laser pulse corresponding to each laser frequency. Figure 3 It represents the response surface when the laser wavelength is 532.25935nm and the altitude is 5km.

[0047] The fourth step is to extract the lookup table corresponding to the actual radial wind speed range of the atmosphere from the initial lookup table as the target lookup table.

[0048] That is, a lookup table corresponding to the radial wind speed range that may exist in the actual atmosphere is extracted from the initial lookup table as the target lookup table.

[0049] Since the horizontal wind speed of the atmospheric wind field in the troposphere usually does not exceed 100m / 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 of the atmospheric wind field in the troposphere is approximately ±33m / s; in order to avoid invalid data values ​​that deviate from the actual value in the subsequent search process, this application extracts the part covering the radial wind speed range of -35~35m / s in the initial lookup table as the target lookup table.

[0050] S102, obtaining N normalized wind speed ratios corresponding to N laser pulses of different frequencies.

[0051] Among them, N laser pulses with different frequencies correspond one to one to N normalized wind speed ratios.

[0052] The N laser pulses of different frequencies in the present application are laser pulses emitted by the same light source within a target time range. For example, the N laser pulses of different frequencies may be lasers emitted by light emitted by a laser after passing through different acousto-optic modulators, or may be lasers of different frequencies emitted by adjusting the driving signal of the same acousto-optic modulator.

[0053] It should be noted that N laser pulses of different frequencies emitted by the same light source in the present application are emitted alternately. Since the switching speed of the driving signal is very fast, the laser pulses corresponding to each frequency are emitted alternately at extremely short time intervals. The normalized wind speed ratio corresponding to the laser pulse of each frequency can be regarded as the normalized wind speed ratio obtained within the same target time range or even at the same time.

[0054] Wherein, N in this application is an integer greater than or equal to 2; that is, the value of N can be 2, 3, or 4. However, considering that the results of radial wind speed and aerosol backscatter ratio measured by 2 laser pulses are inaccurate, and data is obtained based on more than 4 laser pulses, 4 lookup tables are required at each height, and the process of calculating radial wind speed and aerosol backscatter ratio is too cumbersome, and the memory usage of the lookup 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 application adopts a method of alternating the emission of laser pulses with three frequencies to synchronously determine the radial wind speed and aerosol backscatter ratio.

[0055] Figure 4 A schematic diagram of the relationship between laser frequency and normalized transmittance provided for the application example. The normalized transmittance of the three laser frequencies A, B and C on the iodine 1109 line in this application is as follows Figure 4As shown. Among them, the emission wavelength corresponding to the frequency of point A is 532.25935nm, the emission wavelength corresponding to the frequency of point B is 532.25955nm, and the emission wavelength corresponding to the frequency of point C is 532.26130nm. In the subsequent embodiments, three laser frequencies will be taken as an example to introduce the method disclosed in this application for synchronously determining radial wind speed and aerosol backscattering ratio.

[0056] To facilitate understanding of the acquisition process of the normalized wind speed ratio corresponding to each frequency (also called the measured normalized wind speed ratio), this application takes the target laser frequency as an example to introduce the steps of acquiring the normalized wind speed ratio corresponding to the target laser frequency. The target laser frequency is any one of a plurality of different laser frequencies.

[0057] In an optional implementation, the step of obtaining the normalized wind speed ratio corresponding to the target laser frequency includes: In the first step, a first direction and a second direction opposite to the first direction are determined.

[0058] For example, if the first direction is due east, the second direction is due west; if the first direction is due south, the second direction is due north.

[0059] The second step is 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.

[0060] 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 the figure 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 east direction, is described. The process is specifically as follows: According to the laser radar equation, the number of photons received in the measurement channel and the number of photons received in the reference channel at the target laser frequency in the east direction are measured. The number of photons received in the measurement channel and the number of photons received in the reference channel are shown in formula (5). Formula (5) is specifically: (5) K in formula (5) M is the system constant of the laser radar measurement channel; K R is the system constant of the reference channel of the laser radar; A is the receiving area of ​​the laser radar system; r is the height from the ground; f a (v) represents the second response spectrum; β a (r) is the aerosol backscatter coefficient at a height r above the ground; f m (r, v) represents the first response spectrum at a height r from the ground; β m(r) is the backscattering coefficient of atmospheric molecules at a height r above the ground; α a (v') is the atmospheric aerosol extinction ratio; α m (v') is the extinction ratio of atmospheric molecules; r' is the step size of integration; △r is the detection range resolution of the laser radar system; N M (r, v) represents the number of photons received by the laser radar measurement channel; N R (r) represents the number of photons received by the lidar reference channel.

[0061] After obtaining the number of photons received in the measurement channel and the number of photons received in the reference channel at the target laser frequency in the 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: (6) N in formula (6) M (r, v) represents the number of photons received by the laser radar measurement channel; N R (r) represents the number of photons received by the lidar reference channel; R M (r, v) is the measured wind speed ratio.

[0062] Thus, after determining that the first direction is due east and the target laser frequency is Figure 4 After obtaining the laser frequency corresponding to point A, the first measured wind speed ratio corresponding to the target laser frequency in the east direction can be determined based on formula (5) and formula (6).

[0063] 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, that is, the due west direction.

[0064] It is understandable that when using Figure 4 The three laser frequencies shown in the figure are emitted alternately. When determining the radial wind speed and aerosol backscattering ratio, we can first use the laser pulse corresponding to the laser frequency at point A to scan for 30 seconds, then adjust the frequency to the laser pulse corresponding to the laser frequency at point B to scan for 30 seconds, and then adjust the frequency to point C to scan for 30 seconds. Each frequency point will return the number of photons received by the measurement channel and the number of photons received by the reference channel. Then, the number of photons of the measurement channel and the number of photons of the reference channel corresponding to each frequency point are substituted into formula (6) to obtain the measured wind speed ratio corresponding to each frequency point.

[0065] In a third step, an average of the first measured wind speed ratio and the second measured wind speed ratio is used as the measured zero wind speed ratio.

[0066] After using the above method to obtain 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), the average of the measured wind speed ratio in the first direction and the measured wind speed ratio in the second direction is taken as the measured zero wind speed ratio corresponding to the target laser frequency.

[0067] It should be noted that the reason why the average 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 in this application is as follows: When the wind laser radar measures the wind profile, it measures in the four directions of southeast, northwest and northwest at a certain elevation angle θ. The measured wind speed ratio in each direction is shown in formula (7): (7) In formula (7), R W,i represents the measured wind speed ratio in the i direction; E is due east, S is due south, W is due west, and N is due north; r0 is the zero wind speed ratio; △r h,i is the ratio change caused by the horizontal component of the radial wind speed in the i direction; △r v,i The ratio change caused by the vertical component of the radial wind speed in the i direction.

[0068] Taking the two symmetrical directions of east and west as an example, when the measurement elevation angles are equal, assuming the horizontal uniformity of the atmosphere (wind field, temperature field and aerosol distribution) 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 horizontal component in the west direction.

[0069] Since the laser beam is always in the atmospheric wind field, it is impossible to directly obtain the wind speed ratio at zero wind speed from the measurement signal returned from a single direction. Figure 4 After scanning for 30 seconds in the order of ABC in the figure, the motor drives the wedge mirror to the west direction and scans for 30 seconds in the order of CBA. That is, for the target frequency, scan in the east direction for 30 seconds, and then drive the wedge mirror to the west direction by the motor to scan for 30 seconds.

[0070] The formula (8) can be obtained by adding the measured wind speed ratios in the two directions. Formula (8) is as follows: (8) In formula (8), R M,E Represents the measured wind speed ratio of the target laser frequency in the east direction, that is, the first measured wind speed ratio; R W,Wrepresents the measured wind speed ratio of the target laser frequency in the due west direction, i.e., the second measured wind speed ratio; r0 represents the measured zero wind speed ratio corresponding to the target laser frequency; △r v Represents the vertical component of radial wind speed in the east direction Due to △r v Compared with the zero wind speed ratio r0, it is very small and can be ignored. Then, formula (9) is obtained from formula (8): (9) The meaning of each letter in formula (9) is as described in formula (8) and will not be repeated here. Through the above analysis, it can be seen that the average of the measured wind speed ratio corresponding to the target laser frequency in the first direction (the first measured wind speed ratio) and the measured wind speed ratio corresponding to the target laser frequency in the second direction (the second measured wind speed ratio) can be used as the measured zero wind speed ratio corresponding to the target laser frequency.

[0071] In the fourth step, 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 any direction.

[0072] After obtaining the measured zero wind speed ratio corresponding to the target laser frequency, the measured wind speed ratio corresponding to the target laser frequency in any direction, such as the east direction, can be 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 east direction. Formula (10) is specifically: (10) In formula (10), NWR represents the normalized wind speed ratio, r0 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 east direction; v represents the target laser frequency; r represents the height from the ground.

[0073] It is understood that the target laser frequency in this application is Figure 4 Any of the three laser frequencies shown in . In the process of using laser radar to measure wind profiles, for each laser frequency used by the laser radar, the method introduced in this application can be used to calculate the normalized wind speed ratio corresponding to the 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.

[0074] S103: Determine N projection curves based on the target lookup table and the N normalized wind speed ratios.

[0075] First, after obtaining the target lookup table and N normalized wind speed ratios, determine the acceptable tolerance, that is, determine the preset allowable error. For example, in this application, 0.001 is used as the preset allowable error.

[0076] Then, based on the N normalized wind speed ratios and the preset allowable errors, N target normalized wind speed ratio sets are determined, wherein the N normalized wind speed ratios correspond one-to-one to the N target normalized wind speed ratio sets; and the normalized wind speed ratios in the target normalized wind speed ratio set are the normalized wind speed ratios in the target lookup table.

[0077] For example, in obtaining Figure 4 The normalized wind speed ratio values ​​corresponding to the three frequency points A, B and C are obtained, that is, NWR A , NWR B and NWR C After the value of the normalized wind speed ratio NWR corresponding to the frequency point A is obtained, A and the preset redundancy error 0.0001, determined and recorded in the target lookup table NWR1, and NWR A At least one normalized wind speed ratio whose absolute value of the difference is less than 0.0001 is used as the target normalized wind speed ratio set corresponding to frequency point A; the value NWR of the normalized wind speed ratio corresponding to frequency point B can be used as the target normalized wind speed ratio set corresponding to frequency point A; B and the preset redundancy error of 0.0001, and is recorded in the target lookup table NWR2, and NWR B At least one normalized wind speed ratio whose absolute value of the difference is less than 0.0001 is used as the target normalized wind speed ratio set corresponding to frequency point B; the value NWR of the normalized wind speed ratio corresponding to frequency point C can be used as the target normalized wind speed ratio set corresponding to frequency point B; C and the preset redundancy error 0.0001, determined and recorded in the target lookup table NWR3, and NWR C At least one normalized wind speed ratio whose absolute value of the difference is less than 0.0001 is used as the target normalized wind speed ratio set corresponding to the frequency point C.

[0078] It can be understood that if N=3, that is, 3 laser pulses are used to measure the radial wind speed and the aerosol backscatter ratio, there are also three corresponding target lookup tables, one for each frequency.

[0079] Finally, based on N target normalized wind speed ratio sets and the target lookup table, N initial projection curves are determined; each initial projection curve is smoothed to obtain N projection curves.

[0080] Among them, the N target normalized wind speed ratio sets correspond one-to-one to the N projection curves.

[0081] Taking the target normalized wind speed ratio set corresponding to frequency A as an example, the value of the normalized wind speed ratio in the target normalized wind speed ratio set corresponding to frequency A is taken as a determined value, and 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 are determined from the target lookup table, and then the curve corresponding to the frequency point A is obtained; the curve is projected onto a 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 the frequency point A; the initial projection curve is smoothed to obtain the projection curve corresponding to the frequency A.

[0082] Similarly, the projection curve corresponding to the frequency point B and the projection curve corresponding to the frequency point C can be obtained.

[0083] Figure 5A , Figure 5B and Figure 5C Schematic diagram of three processes for determining projection curves based on a preset target lookup table and a normalized wind speed ratio provided in an embodiment of the present application. Figure 5A The inclined surface is a schematic diagram obtained by plotting each data in the lookup table corresponding to frequency point A. Figure 5A Gray plane (NWR A The plane indicated by ( ) is the target normalized wind speed ratio set corresponding to frequency point A. Figure 5B The inclined surface is a schematic diagram obtained by plotting each data in the lookup table corresponding to frequency point B. Figure 5B Gray plane (NWR B The plane indicated by ( ) is the target normalized wind speed ratio set corresponding to frequency point B. Figure 5C The inclined surface is a schematic diagram obtained by plotting each data in the lookup table corresponding to the frequency point C. Figure 5C Gray plane (NWR C The plane indicated by ( ) is the target normalized wind speed ratio set corresponding to the frequency point C.

[0084] Figure 5A NWR A is the normalized wind speed ratio corresponding to frequency point A; Figure 5B Medium NWR B is the normalized wind speed ratio corresponding to frequency point B; Figure 5C Medium NWR C is the normalized wind speed ratio corresponding to frequency point C. Figure 5A , Figure 5B and Figure 5C The coordinates in are: radial wind speed (VLos), aerosol backscatter ratio (Rb) and normalized wind speed ratio. Figure 5A The value range of the normalized wind speed ratio NWR1 in the middle ordinate is 0.35-0.55; Figure 5BThe value range of the normalized wind speed ratio NWR2 in the middle ordinate is 0-1.2; Figure 5C The value range of the normalized wind speed ratio NWR3 in the middle vertical coordinate is 0.2-0.7.

[0085] It should be noted that the Figure 3 By extracting the part of the surface that can cover the radial wind speed range that may exist in the actual atmosphere, we get the inclined surface.

[0086] S104: Determine the radial wind speed and the aerosol backscattering ratio based on the N projection curves.

[0087] Figure 6 A schematic diagram of the positional relationship of three projection curves provided in an embodiment 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 ).

[0088] 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.

[0089] 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.

[0090] 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.

[0091] 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.

[0092] 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.

[0093] Exemplarily, when a method of synchronously determining the radial wind speed and the aerosol backscattering ratio using laser pulses of two frequencies is used, the method in the aforementioned embodiment is then used to determine the projection curve corresponding to the laser pulse of each of the two frequencies. The horizontal coordinate of the intersection of the two projection curves can be used as the radial wind speed corresponding to the target time range, and the vertical coordinate of the intersection can be used as the aerosol backscattering ratio corresponding to the target time range.

[0094] Exemplarily, when a method of synchronously determining radial wind speed and aerosol backscattering ratio using four-frequency laser pulses is used, the method in the aforementioned embodiment is then used to determine the projection curve corresponding to the laser pulse of each of the four frequencies. The intersection points of the four projection curves can be used as vertices to construct a quadrilateral; based on the quadrilateral, the radial wind speed and aerosol backscattering ratio corresponding to the target time range are determined.

[0095] Based on the method for synchronously determining the radial wind speed and the aerosol backscattering ratio disclosed in the aforementioned embodiment, the present application also discloses a device for synchronously determining the radial wind speed and the aerosol backscattering ratio. Figure 7 A schematic diagram of the structure of a synchronous measurement device provided in an embodiment of the present application. Figure 7 As shown, the synchronous measurement device 700 includes: A target lookup table determination module 701 is 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 backscatter ratio; The normalized wind speed ratio acquisition module 702 is used to acquire N normalized wind speed ratios corresponding to N laser pulses of different frequencies; the N laser pulses of different frequencies correspond to the N normalized wind speed ratios one by one; N is an integer greater than or equal to 2; the N laser pulses of different frequencies are emitted externally by the same light source within a target time range; The projection curve acquisition module 703 is used to determine N projection curves based on the target lookup table and the N normalized wind speed ratios; the N normalized wind speed ratios correspond to the N 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 704 is used to determine the radial wind speed and aerosol backscattering ratio corresponding to the target time range based on the N projection curves.

[0096] In an optional implementation, the target data acquisition module 704 includes: A target triangle determination unit, used for constructing a target triangle by taking the intersection of every two projection curves among the three projection curves as vertices; The target parameter determination unit is used to use the abscissa of the inner center of the target triangle as the radial wind speed corresponding to the target time range, and use the ordinate of the inner center as the aerosol backscattering ratio corresponding to the target time range.

[0097] In an optional implementation, the projection curve acquisition module 703 includes: 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 one-to-one to the N 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; A projection curve determination unit is used to determine the N projection curves based on the N target normalized wind speed ratio sets and the target lookup table; the N target normalized wind speed ratio sets correspond to the N projection curves one by one.

[0098] In an optional implementation, the projection curve determining unit includes: 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 lookup table; The projection curve determination subunit is used to perform smoothing on each of the initial projection curves to obtain the N projection curves.

[0099] In an optional implementation, the normalized wind speed ratio acquisition module 702 includes: a target direction determining unit, configured to determine a first direction and a second direction which is opposite to the first direction; 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; a measured zero wind speed ratio determining unit, configured to use an average of the first measured wind speed ratio and the second measured wind speed ratio as the measured zero wind speed ratio; The normalized wind speed ratio determination unit is used to take half of the ratio of the measured wind speed ratio corresponding to the target laser frequency in any direction and the measured zero wind speed ratio as the normalized wind speed ratio corresponding to the target laser frequency in any direction.

[0100] In an optional implementation, the wind speed ratio determining unit includes: a photon number determination subunit, used to 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 measured wind speed determination subunit is used 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.

[0101] In an optional implementation, the synchronous measurement device 700 further includes: A spectrum determination module, used to obtain backscattering spectra of atmospheric molecules and backscattering spectra of aerosols; A first response spectrum determination module, used for convolving the iodine molecule filter transmittance curve with the backscattering spectrum of the atmospheric molecules to obtain a first response spectrum; a second response spectrum determination module, configured to convolve the iodine molecule filter transmittance curve with the backscattering spectrum of the aerosol to obtain a second response spectrum; An initial lookup table determination module, configured to obtain 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; The target lookup table determination module is used to extract the lookup table corresponding to the actual radial wind speed range of the atmosphere from the initial lookup table as the target lookup table.

[0102] Based on the method and device for synchronously determining the radial wind speed and the aerosol backscattering ratio provided in the aforementioned embodiments, the present application also provides a computer-readable storage medium on which a computer program is stored. 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.

[0103] Based on the method and device for synchronously determining radial wind speed and aerosol backscatter ratio provided in the above embodiments, the present application further provides an electronic device, including: a memory having a computer program stored thereon; A processor is used to execute the computer program in the memory to implement some or all of the steps in the method for synchronously determining radial wind speed and aerosol backscatter ratio provided in the above embodiment.

[0104] It should be noted that each embodiment in this specification is described in a progressive manner, and the same or similar parts between the embodiments can be referred to each other, and each embodiment focuses on the differences from other embodiments. In particular, for the device embodiment, since it is basically similar to the method embodiment, the description is relatively simple, and the relevant parts can be referred to the partial description of the method embodiment. The device embodiment described above is merely schematic, in which the unit described as a separate component may or may not be physically separated, and the component prompted as a unit may or may not be a physical unit, that is, it may be located in one place, or it may be distributed on multiple network units. Some or all of the modules can be selected according to actual needs to achieve the purpose of the scheme of this embodiment. Ordinary technicians in this field can understand and implement it without paying creative work.

[0105] The above is only a specific implementation 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 a person skilled in the art within the technical scope disclosed in the present application should be included in the protection scope of the present application. Therefore, the protection scope of the present application should be based on 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 N normalized wind speed ratios corresponding to N laser pulses of different frequencies; the N laser pulses of different frequencies correspond one to one to 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 externally by the same light source within a target time range; Based on the target lookup table and the N normalized wind speed ratios, N projection curves are determined; the N normalized wind speed ratios correspond one-to-one to the N projection curves; the projection curves indicate the corresponding relationship between the aerosol backscattering ratio and the radial wind speed; Based on the N projection curves, the radial wind speed and the aerosol backscattering ratio corresponding to the target time range are determined.

2. The method according to claim 1, characterized in that Said N is 3; The determining, based on the N projection curves, the radial wind speed and the aerosol backscattering ratio corresponding to the target time range includes: The intersection of every two projection curves among the three projection curves is used as the vertex to construct the target triangle; The abscissa of the inner core of the target triangle is used as the radial wind speed corresponding to the target time range, and the ordinate of the inner core is used as the aerosol backscattering ratio corresponding to the target time range.

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

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

5. The method according to claim 1, characterized in that The target laser frequency is any one of the N laser frequencies, and 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.

6. The method according to claim 5, 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.

7. 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.

8. 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, used to acquire N normalized wind speed ratios corresponding to N laser pulses of different frequencies; the N laser pulses of different frequencies correspond to the N normalized wind speed ratios one by one; N is an integer greater than or equal to 2; the N laser pulses of different frequencies are emitted externally by the same light source within a target time range; A projection curve acquisition module, used to determine N projection curves based on the target lookup table and the N normalized wind speed ratios; the N normalized wind speed ratios correspond one-to-one to the N projection curves; the projection curve indicates the corresponding relationship between the aerosol backscattering ratio and the radial wind speed; The target data acquisition module is used to determine the radial wind speed and aerosol backscattering ratio corresponding to the target time range based on the N projection curves.

9. 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 7 are implemented.

10. 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 7.

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