Wind-finding method based on fusion of millimeter wave radar data and laser radar data

Abstract

A wind-finding method based on fusion of millimeter wave radar data and laser radar data, comprising: S1, acquiring wind-finding radar parameters; S2, on the basis of the wind-finding radar parameters, acquiring system state flag bits of wind-finding radars, determining whether the wind-finding radars work normally, and executing corresponding behaviors; S3, acquiring measurement data of the wind-finding radars at different heights, and caching related parameters; S4, by determining radial wind speed significant bits, selecting a corresponding wind-finding radar, and performing inversion on the wind speed; S5, fusing the wind speeds inverted by the millimeter wave wind-finding radar and the laser wind-finding radar to obtain a fused output wind speed; and S6, outputting a horizontal wind speed and a wind direction corresponding to each height level. According to the wind-finding method based on fusion of millimeter wave radar data and laser radar data, two types of wind-finding radar measurement data obtained simultaneously are fused, improving the data reliability of wind speed and wind direction measurement; and the advantages of different wind-finding radars are fully utilized, improving the overall measurement precision.

Description

Wind measurement method based on millimeter wave radar and lidar data fusion Technical Field

[0001] The present invention relates to the field of radar measurement, and in particular to a wind measurement method based on the fusion of millimeter-wave radar and lidar data. Background Art

[0002] LiDAR uses lasers as a medium. Its operating principle is that a laser generates signal light, which is transmitted through an optical antenna and scanning mechanism into the air being measured. The light interacts with aerosol particles within the air, producing a backscattered signal containing velocity information. Using the Doppler principle, the Doppler frequency shift of the echo signal is proportional to the velocity of the aerosol particles (i.e., wind speed), which can be processed to obtain radial wind speed. By decomposing and synthesizing the same radial wind speed, the wind speed and direction at the corresponding altitude can be measured.

[0003] Due to its advantages such as high spatiotemporal resolution, simple installation and maintenance, and high degree of automation, laser wind radar has been widely used in various fields, such as environmental meteorological monitoring, aviation meteorology, and wind field monitoring. Millimeter-wave radar, like lidar, emits multiple beams and uses the Doppler effect generated by wind motion to decompose and synthesize the radial wind speed and direction of four beams at the same altitude. This ultimately generates wind speeds and directions at different altitudes for wind power prediction and wind resource assessment. Millimeter-wave wind radars are functionally identical to lidars and wind towers, but their wind measurement principles differ significantly. Millimeter-wave radars exhibit similar Rayleigh and Mie scattering to lidars on clear days, but can also experience the Bragg effect on foggy and rainy days. Therefore, millimeter-wave radars offer better wind measurement performance in foggy and rainy weather.

[0004] Ground-based wind radars are commonly used in wind resource assessment, wind power forecasting systems, and wind farm operations management. LiDAR offers many advantages, including high data efficiency in normal weather, high wind speed measurement accuracy, high temporal and spatial resolution, and simple installation and maintenance. However, they are relatively less resistant to interference from inclement weather such as rain, snow, and fog. Compared to LiDAR, millimeter-wave wind radars are less susceptible to interference from rain and fog, but their wind speed measurement accuracy is lower.

[0005] Summary of the Invention

[0006] In order to solve the defects of poor environmental adaptability and low ranging accuracy of the existing single-standard radar wind measurement, the purpose of the present invention is to provide a wind measurement method based on the fusion of millimeter wave radar and lidar data.

[0007] In order to achieve the above objectives, the present invention adopts the following technical solutions:

[0008] The wind measurement method based on millimeter wave radar and lidar data fusion includes the following steps:

[0009] S1. Obtain wind radar measurement data;

[0010] The wind measurement radar includes a millimeter wave wind measurement radar and a laser wind measurement radar; the wind measurement radar measurement data includes the radial wind speed of the millimeter wave wind measurement radar, the radial wind speed of the laser wind measurement radar and the corresponding radial wind speed flag;

[0011] S2. Based on the wind radar measurement data, obtain the wind radar system status flag, determine whether the wind radar is working properly, and perform corresponding actions;

[0012] S3, obtaining the measurement data of the wind radar at different heights and caching the relevant parameters;

[0013] The measurement data of the wind measuring radar at different heights include the azimuth angle, radial wind speed and radial wind speed mark position of the laser wind measuring radar at different heights, and also include the azimuth angle, radial wind speed and radial wind speed mark position of the millimeter wave wind measuring radar at different heights;

[0014] S4. By determining the effective position of the radial wind speed, select the corresponding wind measuring radar and invert the wind speed;

[0015] S5. Fuse the wind speeds inverted by the millimeter wave wind radar and the laser wind radar to obtain the fused output wind speed

[0016] S6. Output the horizontal wind speed WSpeed ​​and wind direction WDir corresponding to each altitude layer.

[0017] As a further preferred embodiment of the present invention, obtaining wind radar measurement data includes:

[0018] S1.1. Calibrate and align the millimeter wave wind radar and laser wind radar time;

[0019] S1.2. Obtain radial wind speed data for the same altitude layer set at the same time;

[0020] The altitude levels include several different altitudes;

[0021] S1.3. Obtain a radial wind speed flag of the wind measuring radar, where the radial wind speed flag includes a valid flag 1 and an invalid flag 0.

[0022] As a further preferred embodiment of the present invention, the step of determining whether the wind measurement radar is operating normally and executing corresponding actions includes the following steps:

[0023] S2.1. Obtain a wind radar system status flag, where the system status flag includes a valid flag bit 1 and an invalid flag bit 0;

[0024] S2.2. When the system status flag of the millimeter-wave wind measurement radar is 1, the millimeter-wave wind measurement radar is working normally;

[0025] S2.3. When the system status flag of the millimeter-wave wind measurement radar is 0, the millimeter-wave wind measurement radar is working abnormally;

[0026] S2.4. When the system status flag of the laser wind radar is 1, the laser wind radar is working normally;

[0027] S2.5. When the system status flag of the laser wind measuring radar is 0, the laser wind measuring radar is working abnormally.

[0028] As a further preferred embodiment of the present invention, obtaining measurement data of wind measuring radar at different heights includes:

[0029] S3.1. Set up the laser wind radar scanning equipment and confirm the azimuth of the laser wind radar. The number of azimuths should be ≥ 3.

[0030] S3.2. The laser wind radar caches the radial wind speeds corresponding to different azimuths and altitudes, as well as the corresponding radial wind speed flags;

[0031] S3.3. Set up the millimeter wave wind measurement radar scanning equipment and confirm the millimeter wave wind measurement radar azimuth angle, with the number of azimuth angles ≥ 3;

[0032] S3.4. The millimeter-wave wind measurement radar caches different azimuth angles, radial wind speeds, and corresponding radial wind speed flags.

[0033] As a further preferred embodiment of the present invention, determining the effective position of the wind speed and selecting the corresponding wind measuring radar includes:

[0034] S4.1. Determine whether, at the same altitude, the radial wind speed flag stored in the laser wind radar buffer contains three or more valid flags in different scanning directions.

[0035] S4.2. If there are three or more valid flags in different scanning directions, the laser wind radar is selected for wind speed inversion; otherwise, if there is weather interference, the millimeter wave wind radar is selected for wind speed inversion.

[0036] As a further preferred embodiment of the present invention, when a laser wind radar is selected for wind speed inversion,

[0037] pass Inversion Where n is the number of beams, Height j The north-south wind speed component, the east-west wind speed component, and the vertical wind speed; γ is the tilt angle of the laser wind radar beam;

[0038] pass Calculate the horizontal wind speed of the laser wind radar

[0039] As a further preferred embodiment of the present invention, when the millimeter wave wind measurement radar is selected for wind speed inversion,

[0040] pass Inversion in, Height j North-south wind speed component, east-west wind speed component and vertical wind speed; γ m is the millimeter wave wind radar beam tilt angle;

[0041] pass Calculate the horizontal wind speed of the millimeter wave wind radar

[0042] As a further preferred embodiment of the present invention, in step S5, the output wind speed is obtained by combining the following formula:

[0043] and

[0044] Among them, α and β are the wind speed weight factors corresponding to the laser wind radar and millimeter wave wind radar respectively. Height j North-south wind speed component and east-west wind speed component.

[0045] As a further preferred embodiment of the present invention, the determination of the wind speed weight factors corresponding to the laser wind measurement radar and the millimeter wave wind measurement radar includes the following steps:

[0046] S1, determine whether the radial wind speed flag of the current laser wind measurement radar is 1;

[0047] S2. If the radial wind speed flag of the current laser wind measurement radar is 1, determine whether the radial wind speed flag of the current millimeter wave wind measurement radar is 1;

[0048] S3. If the radial wind speed flag of the current millimeter-wave wind measurement radar is 1, then determine the appropriate wind speed weight factor based on the actual wind measurement application scenario and engineering requirements, where α ≥ β, and 1> α ≥ β> 0, and α + β = 1; otherwise, α = 1, β = 0;

[0049] S4. If the radial wind speed flag of the current laser wind measurement radar is 0, determine whether the radial wind speed flag of the current millimeter wave wind measurement radar is 1;

[0050] S5. If the radial wind speed flag of the current millimeter-wave wind measurement radar is 1, then α=0, β=1; otherwise, then α=0, β=0.

[0051] As a further preferred embodiment of the present invention, the horizontal wind speed WSpeed ​​corresponding to each altitude layer is get;

[0052] Each altitude layer corresponds to WDir through Get the wind direction WDir of the corresponding altitude layer.

[0053] The present invention is beneficial in that:

[0054] 1. The present invention uses the radial wind speed of the laser wind radar and the radial wind speed of the millimeter wave wind radar obtained simultaneously at the same location to perform wind speed inversion, measures the wind field to be measured, and integrates the measurement data of the laser wind radar and the millimeter wave wind radar, thereby improving the reliability of the measurement data;

[0055] 2. The present invention mainly measures the wind speed and direction of the wind field under normal weather conditions based on the laser wind measurement radar, making full use of the advantages of the laser wind measurement radar in normal weather conditions, such as high data efficiency, high wind speed measurement accuracy, and high temporal and spatial resolution, to achieve accurate measurement of wind speed and direction under normal weather conditions;

[0056] 3. The present invention mainly uses millimeter wave wind measurement radar in severe rainy and foggy weather, making full use of the anti-interference ability of millimeter wave radar in interfering weather such as rain, snow and fog, and can achieve accurate measurement of wind speed and direction in interfering weather, ensuring data efficiency, solving the problem of low wind speed measurement efficiency of laser wind measurement radar in interfering weather, and enhancing the environmental adaptability of wind measurement radar;

[0057] 4. Wind speed inversion is performed based on the radial wind speed of the basic laser wind radar and the radial wind speed of the millimeter-wave wind radar, and the wind speed measurement values ​​of the two types of radars are weighted and calculated. The wind direction and other relevant wind speed data (turbulence, etc.) are calculated based on the fused wind speed, achieving stable output of wind speed and direction values ​​in any weather. BRIEF DESCRIPTION OF THE DRAWINGS

[0058] FIG1 is a schematic flow diagram of the present invention;

[0059] FIG2 is a schematic diagram of a specific process of the present invention;

[0060] FIG3 is a schematic diagram of the flow chart for determining the wind speed weight factor. DETAILED DESCRIPTION

[0061] The present invention will be described in detail below with reference to the accompanying drawings and specific embodiments.

[0062] In conjunction with Figures 1 and 2, the wind measurement method based on the fusion of millimeter-wave radar and lidar data includes the following steps:

[0063] S1. Obtain wind radar measurement data.

[0064] The wind measuring radar includes a millimeter wave wind measuring radar and a laser wind measuring radar; the wind measuring radar measurement data includes the radial wind speed of the millimeter wave wind measuring radar, the radial wind speed of the laser wind measuring radar and their corresponding radial wind speed flags.

[0065] The obtaining of wind radar measurement data comprises:

[0066] S1.1. Calibrate and align the millimeter-wave wind radar and laser wind radar time.

[0067] S1.2. Obtain radial wind speed data for the same altitude layer set at the same time; the altitude layer set includes several different altitudes.

[0068] S1.3. Obtain a radial wind speed flag of the wind measuring radar, where the radial wind speed flag includes a valid flag 1 and an invalid flag 0.

[0069] S2. Based on the wind radar measurement data, obtain the wind radar system status flag, determine whether the wind radar is working normally, and perform corresponding actions.

[0070] Determining whether the wind radar is working properly and executing corresponding actions includes the following steps:

[0071] S2.1. Obtain a wind radar system status flag, where the system status flag includes a valid flag 1 and an invalid flag 0.

[0072] S2.2. When the system status flag of the millimeter-wave wind measurement radar is 1, the millimeter-wave wind measurement radar is working normally.

[0073] S2.3. When the system status flag of the millimeter-wave wind measurement radar is 0, the millimeter-wave wind measurement radar is working abnormally.

[0074] S2.4. When the system status flag of the laser wind measuring radar is 1, the laser wind measuring radar is working normally.

[0075] S2.5. When the system status flag of the laser wind measuring radar is 0, the laser wind measuring radar is working abnormally.

[0076] S3. Obtain measurement data of the wind radar at different heights and cache related parameters.

[0077] The measurement data of the wind measuring radar at different heights include the azimuth angle, radial wind speed and radial wind speed mark position of the laser wind measuring radar at different heights, and also include the azimuth angle, radial wind speed and radial wind speed mark position of the millimeter wave wind measuring radar at different heights.

[0078] Common scanning methods used by wind radars include velocity-azimuth display (VAD) and Doppler beam swinging (DBS). Because the wind speed vector is a three-dimensional vector, wind field inversion requires radial wind speeds in at least three different scanning directions. This means that one cycle includes at least three scanning moments. To achieve wind speed inversion, the number of scanning moments / scanning directions within a cycle must be at least three.

[0079] The obtaining of measurement data of wind measurement radar at different heights includes:

[0080] S3.1. Set up the laser wind radar scanning equipment and confirm the azimuth of the laser wind radar. The number of azimuths N should be ≥ 3.

[0081] S3.2. Laser wind radar cache at different azimuths Azi1, Azi2, ...Azi N , radial wind speed Vlos1_Azi corresponding to different altitude layers i ,Vlos2_Azi i ,...Vlos M _Azi i , (1≤i≤N) and the corresponding radial wind speed flag Flag1_Azi i ,Flag2_Azi i ,...Flag M _Azi i ;Vlos j _Azi i is the azimuth angle Azi i Radial wind speed at the jth (1≤j≤M) altitude layer, Flag j _Azi i is the azimuth angle Azi i Wind speed flag of the jth (1≤j≤M) altitude layer.

[0082] S3.3. Set up the millimeter wave wind measurement radar scanning equipment and confirm the millimeter wave wind measurement radar azimuth. The number of azimuth angles Nm ≥ 3.

[0083] S3.4, millimeter wave wind radar cache at different azimuth angles Azi 1m ,Azi 2m ,...Azi Nm、Radial wind speed Vlos1_Azi im ,Vlos2_Azi im ,...Vlos M _Azi im (1≤im≤N) and the corresponding radial wind speed flag Flag1_Azi im ,Flag2_Azi im ,...Flag M _Azi im .

[0084] S4. By determining the effective position of the radial wind speed, select the corresponding wind measuring radar and invert the wind speed.

[0085] S4.1. Determine whether, at the same altitude, the radial wind speed flag buffered by the laser wind radar contains three or more valid flags in different scanning directions.

[0086] S4.2. If there are three or more valid flags in different scanning directions, the laser wind radar is selected for wind speed inversion; otherwise, if there is weather interference, the millimeter wave wind radar is selected for wind speed inversion.

[0087] For each height layer j (1≤j≤M), by judging whether the number of effective digits of radial wind speed valid flag in a cycle is ≥3 (based on the inversion of single-cycle radial wind speed), that is, the flag (Flag j _Azi1,Flag j _Azi2,,...Flag j _Azi N ) Whether there are more than 3 1s, the judgment criteria can be summarized as: whether there are three effective radial wind speeds in different scanning directions in the radial wind speed to be inverted, and so on.

[0088] For example, for a four-beam laser wind radar, assuming that the radial wind speed is inverted based on num cycles, by determining Flag j _Azi i Is the wind speed valid digit ≥ 2*num+1? If so, perform wind speed inversion.

[0089] When the laser wind radar is selected for wind speed inversion,

[0090] pass Inversion Where n is the number of beams, Height j The north-south wind speed component, the east-west wind speed component, and the vertical wind speed; γ is the tilt angle of the laser wind radar beam.

[0091] pass Calculate the horizontal wind speed of the laser wind radar

[0092] When millimeter wave wind radar is selected for wind speed inversion,

[0093] pass Inversion in, Height j North-south wind speed component, east-west wind speed component and vertical wind speed; γ m is the millimeter-wave wind radar beam tilt angle.

[0094] pass Calculate the horizontal wind speed of the millimeter wave wind radar

[0095] S5. Fuse the wind speeds inverted by the millimeter-wave wind radar and the laser wind radar to obtain the fused output wind speed.

[0096] The output wind speed is obtained by combining the following formula

[0097] and

[0098] Among them, α and β are the wind speed weight factors corresponding to the laser wind radar and millimeter wave wind radar respectively. They are the north-south wind speed component and the east-west wind speed component of the height layer Heightj respectively.

[0099] 3 , the determination of the wind speed weight factor includes the following steps:

[0100] S1. Determine whether the radial wind speed flag of the current laser wind measurement radar is 1.

[0101] S2. If the radial wind speed flag of the current laser wind measurement radar is 1, determine whether the radial wind speed flag of the current millimeter wave wind measurement radar is 1.

[0102] S3. If the radial wind speed flag of the current millimeter-wave wind measurement radar is 1, then α≥β, and 1>α≥β>0, α+β=1; the appropriate wind speed weight factor can be determined according to the actual wind measurement application scenario and engineering requirements. For example, when the weather is clear or the air aerosol density is high, α can be selected as 0.8 and β can be selected as 0.2; or α can be selected as 0.9 and β can be selected as 0.1; when rainy, foggy or bad weather has a greater impact on the measurement accuracy of the laser wind measurement radar, α can be selected as 0.5 and β can be selected as 0.5.

[0103] Otherwise, α=1, β=0.

[0104] S4. If the radial wind speed flag of the current laser wind measurement radar is 0, determine whether the radial wind speed flag of the current millimeter wave wind measurement radar is 1.

[0105] S5. If the radial wind speed flag of the current millimeter-wave wind measurement radar is 1, then α=0, β=1; otherwise, then α=0, β=0.

[0106] S6. Output the horizontal wind speed WSpeed ​​and wind direction WDir corresponding to each altitude layer.

[0107] The horizontal wind speed WSpeed ​​corresponding to each altitude layer is get;

[0108] Each altitude layer corresponds to WDir through Get the wind direction WDir of the corresponding height layer.

[0109] The above shows and describes the basic principles, main features and advantages of the present invention. Those skilled in the art should understand that the above embodiments do not limit the present invention in any form, and any technical solutions obtained by equivalent replacement or equivalent transformation fall within the scope of protection of the present invention.

Claims

1. A wind measurement method based on millimeter wave radar and laser radar data fusion, characterized in that: The following steps are involved: S1. Obtain wind radar measurement data; The wind measuring radar includes a millimeter wave wind measuring radar and a laser wind measuring radar; the wind measuring radar measurement data includes the radial wind speed of the millimeter wave wind measuring radar, the radial wind speed of the laser wind measuring radar and the corresponding radial wind speed flag; S2. Based on the wind radar measurement data, obtain the wind radar system status flag, determine whether the wind radar is working normally, and perform corresponding actions; S3, obtaining the measurement data of the wind radar at different heights and caching the relevant parameters; The measurement data of the wind measuring radar at different heights include the azimuth angle, radial wind speed and radial wind speed mark position of the laser wind measuring radar at different heights, and also include the azimuth angle, radial wind speed and radial wind speed mark position of the millimeter wave wind measuring radar at different heights; S4, by determining the effective position of radial wind speed, selecting the corresponding wind measuring radar, and inverting the wind speed; S5. Fuse the wind speeds inverted by the millimeter wave wind radar and the laser wind radar to obtain the fused output wind speed S6. Output the horizontal wind speed WSpeed ​​and wind direction WDir corresponding to each altitude layer.

2. The wind measurement method based on millimeter wave radar and laser radar data fusion according to claim 1 is characterized in that: The obtaining of wind radar measurement data comprises: S1.

1. Calibrate and align the millimeter wave wind radar and laser wind radar time; S1.

2. Obtain radial wind speed data for the same height layer set at the same time; The altitude hierarchy includes a number of different altitudes; S1.

3. Obtain the radial wind speed flag of the wind measuring radar, wherein the radial wind speed flag includes a valid flag 1 and an invalid flag 0.

3. The wind measurement method based on millimeter wave radar and laser radar data fusion according to claim 1 is characterized in that: The process of judging whether the wind radar is working properly and executing the corresponding action comprises the following steps: S2.1, obtaining the wind radar system status flag, wherein the system status flag includes a valid flag 1 and an invalid flag 0; S2.2, when the system status flag of the millimeter wave wind measurement radar is 1, the millimeter wave wind measurement radar works normally; S2.

3. When the system status flag of the millimeter wave wind measurement radar is 0, the millimeter wave wind measurement radar works abnormally; S2.4, when the system status flag of the laser wind radar is 1, the laser wind radar works normally; S2.

5. When the system status flag of the laser wind measuring radar is 0, the laser wind measuring radar is working abnormally.

4. The wind measurement method based on millimeter wave radar and laser radar data fusion according to claim 1 is characterized in that: The obtaining of the measurement data of the wind measuring radar at different heights comprises: S3.

1. Set up the laser wind radar scanning equipment and confirm the azimuth of the laser wind radar. The number of azimuths should be ≥ 3; S3.

2. Laser wind radar caches radial wind speeds corresponding to different azimuths and altitudes, as well as corresponding radial wind speed flags; S3.

3. Set up the millimeter wave wind measurement radar scanning equipment and confirm the millimeter wave wind measurement radar azimuth, the number of azimuths ≥ 3; S3.

4. The millimeter-wave wind radar caches different azimuth angles, radial wind speeds and corresponding radial wind speed flags.

5. The wind measurement method based on millimeter wave radar and laser radar data fusion according to claim 1 is characterized in that: Determining the effective position of the wind speed and selecting the corresponding wind measuring radar comprises: S4.

1. Determine whether there are three radial wind speed flags cached by the laser wind radar at the same altitude. At least one valid flag bit in different scanning directions; S4.

2. If there are three or more valid flags in different scanning directions, the laser wind radar is selected for wind speed inversion; otherwise, if there is weather interference, the millimeter wave wind radar is selected for wind speed inversion.

6. The wind measurement method based on millimeter wave radar and laser radar data fusion according to claim 5 is characterized in that: When the laser wind radar is selected for wind speed inversion, pass Inversion Where n is the number of beams, They are respectively the altitude layers j The north-south wind speed component, the east-west wind speed component and the vertical wind speed; γ is the inclination angle of the laser wind radar beam; pass Calculate the horizontal wind speed of the laser wind radar 7. The wind measurement method based on millimeter wave radar and laser radar data fusion according to claim 5 is characterized in that: When the millimeter wave wind radar is selected for wind speed inversion, pass Inversion in, They are respectively the altitude layers j North-south wind speed component, east-west wind speed component and vertical wind speed; γ m is the millimeter wave wind radar beam tilt angle; pass Calculate the horizontal wind speed of the millimeter wave wind radar 8. The wind measurement method based on millimeter wave radar and laser radar data fusion according to claim 1 is characterized in that: In step S5, the output wind speed is obtained by combining the following formula: and Among them, α and β are the wind speed weight factors corresponding to the laser wind radar and millimeter wave wind radar respectively. They are respectively the altitude layers j North-south wind speed component and east-west wind speed component.

9. The wind measurement method based on millimeter wave radar and laser radar data fusion according to claim 8, characterized in that: Determination of the wind speed weight factor corresponding to the laser wind radar and the millimeter wave wind radar comprises the following steps: S1, determine whether the radial wind speed flag of the current laser wind radar is 1; S2. If the radial wind speed flag of the current laser wind measuring radar is 1, determine whether the radial wind speed flag of the current millimeter wave wind measuring radar is 1; S3. If the radial wind speed flag of the current millimeter-wave wind measurement radar is 1, determine the appropriate wind speed weight factor according to the actual wind measurement application scenario and engineering requirements, where α≥β, 1>α≥β>0, α+β=1; Otherwise, α = 1, β = 0; S4. If the radial wind speed flag of the current laser wind measuring radar is 0, determine whether the radial wind speed flag of the current millimeter wave wind measuring radar is 1; S5. If the radial wind speed flag of the current millimeter-wave wind measurement radar is 1, then α=0, β=1; otherwise, then α=0, β=0.

10. The wind measurement method based on millimeter wave radar and laser radar data fusion according to claim 7, characterized in that: The horizontal wind speed WSpeed ​​corresponding to each altitude layer is Get; the WDir corresponding to each altitude layer is obtained by Get the wind direction WDir of the corresponding altitude layer.

Images