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CN116484167A - A device and method for real-time calculation of atmospheric optical turbulence based on ground measurement - Google Patents

A device and method for real-time calculation of atmospheric optical turbulence based on ground measurement Download PDF

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CN116484167A
CN116484167A CN202310740978.0A CN202310740978A CN116484167A CN 116484167 A CN116484167 A CN 116484167A CN 202310740978 A CN202310740978 A CN 202310740978A CN 116484167 A CN116484167 A CN 116484167A
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李亚林
张洪群
李安
黄鹏
施胜浦
李强
王阳
平嘉贺
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Aerospace Information Research Institute of CAS
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Abstract

The invention provides an atmospheric optical turbulence real-time computing device and method based on ground measurement. Because the atmospheric optical turbulence intensity is mainly determined by the optical turbulence of the low-altitude atmosphere, and the optical turbulence of the low-altitude atmosphere is approximately exponentially distributed along with the height, the invention realizes the purpose of indirectly testing the atmospheric optical turbulence intensity in real time by measuring and counting the duty ratio of the low-altitude atmospheric optical turbulence in the whole atmospheric optical turbulence and simultaneously measuring the atmospheric optical turbulence near the ground in real time and correcting the fitting coefficient of the low-altitude atmospheric optical turbulence in real time.

Description

Atmospheric optical turbulence real-time computing device and method based on ground measurement
Technical Field
The invention relates to the field of satellite-to-ground laser communication, in particular to the field of real-time measurement and calculation of atmospheric optical turbulence of a satellite-to-ground laser communication ground station, and particularly relates to a real-time calculation device and method of atmospheric optical turbulence based on ground measurement.
Background
With the rapid development of remote sensing technology, the satellite load quantity and the resolution of the load are greatly improved, and the generated data quantity is increased in geometric level, so that the demand for high-speed satellite-ground data transmission is increasingly urgent. The available bandwidth of satellite-to-ground laser communication can reach THz magnitude, and the communication rate can reach hundred Gbps magnitude, so that the satellite-to-ground laser communication system is an important mode for satellite-to-ground high-speed data transmission in the future. However, laser atmospheric transport requires a quantitative description of the atmospheric turbulence channel. The atmospheric coherence length describes the integrated turbulence intensity across the entire atmospheric transport path and provides a fundamental parameter for analyzing the upstream or downstream transport of the laser in the entire atmosphere.
At present, the differential image motion method is a general method for measuring the atmospheric coherence length at present, and has the advantages of eliminating the influence of tracking error, shaking and wind of a telescope, and being realized by a small-caliber telescope and a CCD with low price. The differential image motion monitor is an instrument for measuring the atmospheric coherence length by using the method, and the instrument calculates the atmospheric coherence length by measuring the gravity center change of the star image caused by the fluctuation of the arrival angle of the star light. However, this method works only in the environment where stars are observable, and cannot work when it encounters a situation where cloud blocking or the background of the sky is strong.
Disclosure of Invention
The invention provides a real-time atmospheric optical turbulence calculating device and method based on ground measurement, which are used for solving the problem that the atmospheric optical turbulence can not be measured and calculated in real time all the weather at present. Because the atmospheric optical turbulence intensity is mainly determined by the optical turbulence of the low-altitude atmosphere, and the optical turbulence of the low-altitude atmosphere is approximately exponentially distributed along with the height, the invention realizes the purpose of indirectly testing the atmospheric optical turbulence intensity in real time by measuring and counting the duty ratio of the low-altitude atmospheric optical turbulence in the whole atmospheric optical turbulence and simultaneously measuring the atmospheric optical turbulence near the ground in real time and correcting the fitting coefficient of the low-altitude atmospheric optical turbulence in real time.
In order to achieve the above purpose, the invention adopts the following technical scheme:
an atmospheric optical turbulence real-time computing device based on ground measurement, comprising: an atmospheric optical turbulence measuring and statistics unit, a low-altitude atmospheric optical turbulence profile measuring and fitting unit, a near-ground atmospheric optical turbulence profile measuring and fitting unit and an atmospheric optical turbulence analysis unit;
the atmospheric optical turbulence measuring and counting unit is used for measuring and storing the optical turbulence intensity of the whole atmosphere and comprises an atmospheric optical turbulence measuring module and an atmospheric optical turbulence intensity storage module;
the low-altitude atmospheric optical turbulence profile measuring and fitting unit is used for measuring and fitting high-precision low-altitude atmospheric turbulence profiles of different seasons and different time periods and comprises an unmanned aerial vehicle flight platform module, a high-precision atmospheric turbulence measuring module, a low-altitude atmospheric optical turbulence intensity calculating module and a low-altitude atmospheric optical turbulence intensity calculating module;
the near-ground atmospheric optical turbulence profile measuring and fitting unit is used for collecting near-ground atmospheric optical turbulence and fitting the near-ground atmospheric optical turbulence profile, and comprises a near-ground atmospheric optical turbulence measuring module and a near-ground atmospheric optical turbulence real-time fitting module;
the atmospheric optical turbulence analysis unit is used for calculating the optical turbulence intensity of the whole atmospheric channel in real time and comprises an atmospheric optical turbulence distribution statistics module and an atmospheric optical turbulence real-time calculation module.
Further, the atmospheric optical turbulence measurement module is used for measuring the optical turbulence intensity of the whole atmospheric channelThe atmospheric optical turbulence intensity storage module is used for storing and counting the atmospheric optical turbulence intensity measured at the moment：
，
Wherein m represents the mth moment and the average value;
the atmospheric optical turbulence measuring module uses a standard differential image motion monitor to measure the atmospheric optical atmospheric turbulence intensity of the whole layer of atmosphere; in order to obtain accurate atmospheric optical turbulence intensity at each moment, the atmospheric optical turbulence intensity storage module counts the average value of the atmospheric optical turbulence intensity at the moment of multiple collection.
Further, the unmanned aerial vehicle flight platform module is used for carrying high-precision atmospheric optical turbulence measurement and statistics units; the high-precision atmospheric optical turbulence measuring module is used for precisely measuring the atmospheric optical turbulence; the low-altitude atmosphere optical turbulence intensity calculation module is used for fitting a low-altitude atmosphere optical turbulence profile and calculating the low-altitude atmosphere optical turbulence intensity：
，
Wherein h is an index, representing a relative height; h1 is the highest point of low-altitude atmospheric turbulence measurement; t is the moment of measurement of the turbulence profile;is the refractive index structural constant of the atmosphere;
the low-altitude atmospheric optical turbulence intensity statistics module is used for counting the low-altitude atmospheric optical turbulence intensity at the moment：
，
Wherein m represents the mth moment and the average value.
Further, the near-ground atmospheric optical turbulence measuring module is used for measuring and collecting atmospheric optical turbulence of different heights in real time; the near-ground atmosphere optical turbulence real-time fitting module is used for fitting an atmosphere optical turbulence profile near the ground in real time, and gives the attenuation rule of the atmosphere optical turbulence intensity along with the height at each moment:
，
wherein A and P represent two parameters of an exponential relationship, h is an index, and represents a relative height; t is the moment of measurement of the turbulence profile;is an atmospheric refractive index structural constant.
Further, the atmospheric optical turbulence distribution statistics module is used for analyzing the duty ratio of the low-altitude atmospheric optical turbulence at a specific moment in the atmospheric optical turbulence intensity：
，
The atmospheric optical turbulence real-time calculation module calculates low-altitude atmospheric optical turbulence intensity according to the fitted near-ground atmospheric optical turbulence profile, and further calculates the optical turbulence intensity of the whole atmospheric channel according to the duty ratio of the low-altitude atmospheric optical turbulence to the atmospheric optical turbulence intensity：
。
The invention also provides a real-time calculation method of the atmospheric optical turbulence based on ground measurement, which comprises the following steps:
step 1, the atmospheric optical turbulence measuring and counting unit measures the intensity of the whole atmospheric optical turbulence at different moments for a long time, and the average atmospheric optical turbulence intensity at each moment is obtained through counting calculation;
step 2, flying the unmanned aerial vehicle once per hour by using the low-altitude atmospheric optical turbulence profile measuring and fitting unit, flying at a constant speed to a low-altitude height, measuring the atmospheric optical turbulence on a path in real time, further obtaining an atmospheric optical turbulence profile at the moment, and calculating to obtain the low-altitude atmospheric optical turbulence intensity;
step 3, repeating the step 2 for a plurality of times to obtain the low-altitude atmospheric optical turbulence intensity at the same moment, and carrying out statistical calculation to obtain the average low-altitude atmospheric optical turbulence intensity at each moment;
step 4, analyzing and calculating the duty ratio of the low-altitude atmospheric optical turbulence at a specific moment in the atmospheric optical turbulence intensity;
step 5, measuring near-ground multi-layer atmospheric optical turbulence in real time by using the near-ground atmospheric optical turbulence profile measuring and fitting unit, and fitting to obtain a low-altitude atmospheric optical turbulence profile;
and step 6, calculating the low-altitude atmosphere optical turbulence intensity according to the low-altitude atmosphere optical turbulence profile, and further obtaining the whole-layer atmosphere optical turbulence intensity according to the ratio of the low-altitude atmosphere optical turbulence to the atmosphere optical turbulence intensity.
The beneficial effects are that:
the invention can measure the near-ground atmosphere optical turbulence in real time, and inversely calculate the intensity of the whole layer of atmosphere optical turbulence, solves the problem that the atmospheric optical turbulence can not be measured and calculated in real time all the weather at present, and comprises the following advantages:
1. the method is simple to operate, high in instantaneity, capable of accurately estimating the atmospheric turbulence intensity of the satellite-to-ground laser communication ground station in real time, and capable of providing support for configuration optimization and task arrangement of an optical system in the station;
2. the invention is not influenced by weather and atmospheric environment, and can stably acquire the intensity of the optical turbulence of the whole atmosphere all the day long;
3. the invention has simple structure, no precise optical device, and most of measurement and maintenance are near the ground, thus being easy to use and maintain.
Drawings
FIG. 1 is a diagram of the composition of an atmospheric optical turbulence real-time computing device based on ground measurement according to the present invention;
FIG. 2 is a flow chart of the method for real-time calculation of atmospheric optical turbulence based on ground measurement.
Detailed Description
The present invention will be described in further detail with reference to the drawings and examples, in order to make the objects, technical solutions and advantages of the present invention more apparent. It should be understood that the specific embodiments described herein are for purposes of illustration only and are not intended to limit the scope of the invention. In addition, the technical features of the embodiments of the present invention described below may be combined with each other as long as they do not collide with each other.
As shown in fig. 1, an atmospheric optical turbulence real-time calculation device based on ground measurement of the present invention includes: an atmospheric optical turbulence measuring and statistics unit, a low-altitude atmospheric optical turbulence profile measuring and fitting unit, a near-ground atmospheric optical turbulence profile measuring and fitting unit and an atmospheric optical turbulence analysis unit.
The atmosphere optical turbulence measuring and counting unit is used for measuring and storing the optical turbulence intensity of the whole atmosphere and mainly comprises an atmosphere optical turbulence measuring module and an atmosphere optical turbulence intensity storage module. Wherein: the atmospheric optical turbulence measuring module is mainly used for measuring the optical turbulence intensity of the whole atmospheric channelThe atmospheric optical turbulence intensity storage module is mainly used for storing and counting atmospheric optical turbulence intensity measured at the moment>：
，
Wherein m represents the mth moment and the average value;
specifically, the atmospheric optical turbulence measurement module measures the atmospheric optical atmospheric turbulence intensity of the whole layer of atmosphere using a standard differential image motion monitor. Because the differential image motion monitor only works in the environment of observable stars and has certain noise fluctuation, in order to obtain the accurate atmospheric optical turbulence intensity at each moment, the atmospheric optical turbulence intensity storage module counts the average value of the atmospheric optical turbulence intensity at the moment of multiple collection.
The low-altitude atmospheric optical turbulence profile measuring and fitting unit is used for measuring and fitting high-precision low-altitude atmospheric turbulence profiles in different seasons and different time periods and comprises an unmanned aerial vehicle flight platform module, a high-precision atmospheric turbulence measuring module, a low-altitude atmospheric optical turbulence intensity calculating module and a low-altitude atmospheric optical turbulence intensity counting module. Wherein: the unmanned aerial vehicle flight platform module is used for carrying high-precision atmospheric turbulence measurement and statistics units; the high-precision atmospheric turbulence measuring module is used for precisely measuring the atmospheric optical turbulence; the low-altitude atmosphere optical turbulence intensity calculation module is used for fitting a low-altitude atmosphere optical turbulence profile and calculating the low-altitude atmosphere optical turbulence intensity：
，
Wherein h is an index, representing a relative height; h1 is the highest point of low-altitude atmospheric turbulence measurement; t is the moment of measurement of the turbulence profile;is the refractive index structural constant of the atmosphere;
the low-altitude atmospheric optical turbulence intensity statistics module is used for counting the low-altitude atmospheric optical turbulence intensity at the moment：
，
The near-ground atmospheric optical turbulence profile measuring and fitting unit is used for collecting near-ground atmospheric optical turbulence and fitting the near-ground atmospheric optical turbulence profile, and comprises a near-ground atmospheric optical turbulence measuring module and a near-ground atmospheric optical turbulence real-time fitting module. The near-ground atmospheric optical turbulence measuring module is used for measuring and collecting atmospheric optical turbulence of different heights in real time; the near-ground atmosphere optical turbulence real-time fitting module is used for fitting an atmosphere optical turbulence profile near the ground in real time, and gives the attenuation rule of the atmosphere optical turbulence intensity along with the height at each moment:
，
wherein a and P represent two parameters of an exponential relationship.
Specifically, in order to ensure the fitting precision of the near-ground atmospheric optical turbulence, the near-ground atmospheric optical turbulence measuring module is required to measure at least 3 layers of atmospheric optical turbulence with different heights, and generally, the atmospheric optical turbulence measuring instruments are respectively fixed at the heights of 2 meters, 4 meters and 8 meters, and the atmospheric optical turbulence with the heights of 3 h1, h2 and h3 are obtained by measuring and respectively recorded as
、、. The near-ground surface atmospheric optical turbulence profile is generally an exponential curve, so that the near-ground surface atmospheric optical turbulence profile real-time fitting module obtains the atmospheric optical turbulence of 3 heights h1, h2 and h3 in real time, and the attenuation law of the atmospheric optical turbulence intensity with the height at the current moment is obtained by fitting through a least square method>And。
the atmospheric optical turbulence analysis unit is used for calculating in real timeThe optical turbulence intensity of the whole atmosphere channel comprises an atmosphere optical turbulence distribution statistics module and an atmosphere optical turbulence real-time calculation module. Wherein the atmospheric optical turbulence distribution statistics module is used for analyzing the duty ratio of the low-altitude atmospheric optical turbulence at a specific moment in the atmospheric optical turbulence intensity：
，
The atmospheric optical turbulence real-time calculation module calculates low-altitude atmospheric optical turbulence intensity according to the fitted near-ground atmospheric optical turbulence profile, and further calculates the optical turbulence intensity of the whole atmospheric channel according to the duty ratio of the low-altitude atmospheric optical turbulence to the atmospheric optical turbulence intensity：
，
As shown in fig. 2, the method for calculating the atmospheric optical turbulence in real time based on ground measurement comprises the following steps:
step 1, the atmospheric optical turbulence measuring and counting unit measures the intensity of the whole atmospheric optical turbulence at different moments for a long time, and the average atmospheric optical turbulence intensity at each moment is obtained through counting calculation;
step 2, flying the unmanned aerial vehicle once per hour by using the low-altitude atmospheric optical turbulence profile measuring and fitting unit, flying at a constant speed to a low-altitude height, measuring the atmospheric optical turbulence on a path in real time, further obtaining an atmospheric optical turbulence profile at the moment, and calculating to obtain the low-altitude atmospheric optical turbulence intensity;
step 3, repeating the step 2 for a plurality of times to obtain the low-altitude atmospheric optical turbulence intensity at the same moment, and carrying out statistical calculation to obtain the average low-altitude atmospheric optical turbulence intensity at each moment;
step 4, analyzing and calculating the duty ratio of the low-altitude atmospheric optical turbulence at a specific moment in the atmospheric optical turbulence intensity;
step 5, measuring near-ground multi-layer atmospheric optical turbulence in real time by using the near-ground atmospheric optical turbulence profile measuring and fitting unit, and fitting to obtain a low-altitude atmospheric optical turbulence profile;
and step 6, calculating the low-altitude atmosphere optical turbulence intensity according to the low-altitude atmosphere optical turbulence profile, and further obtaining the whole-layer atmosphere optical turbulence intensity according to the ratio of the low-altitude atmosphere optical turbulence to the atmosphere optical turbulence intensity.
It will be readily appreciated by those skilled in the art that the foregoing description is merely a preferred embodiment of the invention and is not intended to limit the invention, but any modifications, equivalents, improvements or alternatives falling within the spirit and principles of the invention are intended to be included within the scope of the invention.

Claims (6)

1.一种基于地面测量的大气光学湍流实时计算装置，其特征在于：包括大气光学湍流测量和统计单元、低空大气光学湍流廓线测量和拟合单元、近地面大气光学湍流廓线测量和拟合单元以及大气光学湍流分析单元；1. A real-time calculation device for atmospheric optical turbulence based on ground measurements, characterized in that it includes an atmospheric optical turbulence measurement and statistics unit, a low-altitude atmospheric optical turbulence profile measurement and fitting unit, a near-ground atmospheric optical turbulence profile measurement and fitting unit, and an atmospheric optical turbulence analysis unit; 所述大气光学湍流测量和统计单元用于测量和存储整个大气的光学湍流强度，包括大气光学湍流测量模块和大气光学湍流强度存储模块；The atmospheric optical turbulence measurement and statistics unit is used to measure and store the optical turbulence intensity of the entire atmosphere, including an atmospheric optical turbulence measurement module and an atmospheric optical turbulence intensity storage module; 所述低空大气光学湍流廓线测量和拟合单元用于测量和拟合不同季节、不同时段的高精度低空大气湍流廓线，包含无人机飞行平台模块、高精度大气湍流测量模块、低空大气光学湍流强度计算模块和低空大气光学湍流强度统计模块；The low-altitude atmospheric optical turbulence profile measurement and fitting unit is used to measure and fit high-precision low-altitude atmospheric turbulence profiles for different seasons and time periods. It includes a UAV flight platform module, a high-precision atmospheric turbulence measurement module, a low-altitude atmospheric optical turbulence intensity calculation module, and a low-altitude atmospheric optical turbulence intensity statistics module. 所述近地面大气光学湍流廓线测量和拟合单元用于采集近地面大气光学湍流，并拟合近地面大气光学湍流廓线，包括近地面大气光学湍流测量模块和近地面大气光学湍流实时拟合模块；The near-surface atmospheric optical turbulence profile measurement and fitting unit is used to collect near-surface atmospheric optical turbulence and fit near-surface atmospheric optical turbulence profiles, including a near-surface atmospheric optical turbulence measurement module and a near-surface atmospheric optical turbulence real-time fitting module. 所述大气光学湍流分析单元用于实时计算整个大气信道的光学湍流强度，包括大气光学湍流分布统计模块和大气光学湍流实时计算模块。The atmospheric optical turbulence analysis unit is used to calculate the optical turbulence intensity of the entire atmospheric channel in real time, including an atmospheric optical turbulence distribution statistics module and an atmospheric optical turbulence real-time calculation module. 2.根据权利要求1所述的一种基于地面测量的大气光学湍流实时计算装置，其特征在于，所述大气光学湍流测量模块用于测量整个大气信道的光学湍流强度，大气光学湍流强度存储模块用于存储和统计该时刻测量的大气光学湍流强度：2. The real-time atmospheric optical turbulence calculation device based on ground measurement according to claim 1, characterized in that the atmospheric optical turbulence measurement module is used to measure the optical turbulence intensity of the entire atmospheric channel. The atmospheric optical turbulence intensity storage module is used to store and statistically analyze the atmospheric optical turbulence intensity measured at that moment. : ， , 其中，m表示第m时刻，< >表示均值；Where m represents the m-th time, and < > represent the mean; 所述大气光学湍流测量模块使用标准的差分像运动监视仪测量整层大气的大气光学大气湍流强度；为获取各个时刻准确的大气光学湍流强度，大气光学湍流强度存储模块统计多次采集的同时刻的大气光学湍流强度的平均值。The atmospheric optical turbulence measurement module uses a standard differential image motion monitor to measure the atmospheric optical turbulence intensity of the entire atmosphere. To obtain accurate atmospheric optical turbulence intensity at each moment, the atmospheric optical turbulence intensity storage module calculates the average value of the atmospheric optical turbulence intensity at multiple simultaneous acquisitions. 3.根据权利要求2所述的一种基于地面测量的大气光学湍流实时计算装置，其特征在于，所述无人机飞行平台模块用于搭载高精度的大气光学湍流测量和统计单元；高精度的大气光学湍流测量模块用于精确测量大气光学湍流；所述低空大气光学湍流强度计算模块用于拟合低空大气光学湍流廓线，并计算低空大气光学湍流强度：3. The real-time atmospheric optical turbulence calculation device based on ground measurement according to claim 2, characterized in that the UAV flight platform module is used to carry a high-precision atmospheric optical turbulence measurement and statistical unit; the high-precision atmospheric optical turbulence measurement module is used to accurately measure atmospheric optical turbulence; and the low-altitude atmospheric optical turbulence intensity calculation module is used to fit the low-altitude atmospheric optical turbulence profile and calculate the low-altitude atmospheric optical turbulence intensity. : ， , 其中，h为索引，表示相对高度；h1为低空大气湍流测量的最高点；t为湍流廓线的测量时刻；为大气折射率结构常数；Where h is the index, representing the relative altitude; h1 is the highest point of the low-altitude atmospheric turbulence measurement; and t is the measurement time of the turbulence profile. The atmospheric refractive index structure constant; 低空大气光学湍流强度统计模块用于统计该时刻低空大气光学湍流强度：The low-altitude atmospheric optical turbulence intensity statistics module is used to calculate the low-altitude atmospheric optical turbulence intensity at that moment. : ， , 其中，m表示第m时刻，< >表示均值。Where m represents the m-th time, and < > represent the mean. 4.根据权利要求1所述的一种基于地面测量的大气光学湍流实时计算装置，其特征在于，所述近地面大气光学湍流测量模块用于实时测量和采集不同高度的大气光学湍流；近地面大气光学湍流实时拟合模块用于实时拟合近地面的大气光学湍流廓线，给出各时刻大气光学湍流强度随高度的衰减规律为：4. The real-time atmospheric optical turbulence calculation device based on ground measurement according to claim 1, characterized in that the near-ground atmospheric optical turbulence measurement module is used to measure and collect atmospheric optical turbulence at different altitudes in real time; the near-ground atmospheric optical turbulence real-time fitting module is used to fit the near-ground atmospheric optical turbulence profile in real time, giving the attenuation law of atmospheric optical turbulence intensity with altitude at each moment as follows: ， , 其中，A和P表示指数关系的两个参数，h为索引，表示相对高度；t为湍流廓线的测量时刻；为大气折射率结构常数。Where A and P represent two parameters of the exponential relationship, h is the index representing the relative height, and t is the measurement time of the turbulence profile; is the atmospheric refractive index structure constant. 5.根据权利要求3所述的一种基于地面测量的大气光学湍流实时计算装置，其特征在于，所述大气光光学湍流分布统计模块用于分析特定时刻低空大气光学湍流在大气光学湍流强度的占比：5. The real-time atmospheric optical turbulence calculation device based on ground measurement according to claim 3, characterized in that the atmospheric optical turbulence distribution statistics module is used to analyze the proportion of low-altitude atmospheric optical turbulence in the atmospheric optical turbulence intensity at a specific moment. : ， , 大气光学湍流实时计算模块根据拟合的近地面大气光学湍流廓线计算低空大气光学湍流强度，进而根据低空大气光学湍流在大气光学湍流强度的占比计算整个大气信道的光学湍流强度：The real-time atmospheric optical turbulence calculation module calculates the intensity of low-altitude atmospheric optical turbulence based on the fitted near-surface atmospheric optical turbulence profile, and then calculates the overall optical turbulence intensity of the atmospheric channel based on the proportion of low-altitude atmospheric optical turbulence in the total atmospheric optical turbulence intensity. : 。 . 6.根据权利要求1-5之一所述的一种基于地面测量的大气光学湍流实时计算装置的计算方法，其特征在于，包括如下步骤：6. The calculation method of a real-time atmospheric optical turbulence calculation device based on ground measurement according to any one of claims 1-5, characterized in that it includes the following steps: 步骤1、所述大气光学湍流测量和统计单元长时间测量不同时刻的整层大气光学湍流强度，统计计算得到每个时刻的平均大气光学湍流强度；Step 1: The atmospheric optical turbulence measurement and statistics unit measures the intensity of the entire atmospheric optical turbulence at different times over a long period of time, and calculates the average atmospheric optical turbulence intensity at each time. 步骤2、利用所述低空大气光学湍流廓线测量和拟合单元每小时放飞一次无人机，匀速飞行至低空高度，实时测量路径上的大气光学湍流，进而得到该时刻的大气光学湍流廓线，计算得到低空大气光学湍流强度；Step 2: Utilize the low-altitude atmospheric optical turbulence profile measurement and fitting unit to launch the UAV once per hour, fly at a constant speed to a low altitude, measure the atmospheric optical turbulence along the path in real time, and obtain the atmospheric optical turbulence profile at that moment, and calculate the intensity of low-altitude atmospheric optical turbulence. 步骤3、重复步骤2，多次获取相同时刻的低空大气光学湍流强度，统计计算得到每时刻的平均低空大气光学湍流强度；Step 3: Repeat step 2 to obtain the low-altitude atmospheric optical turbulence intensity at the same time multiple times, and calculate the average low-altitude atmospheric optical turbulence intensity at each time. 步骤4、分析计算特定时刻低空大气光学湍流在大气光学湍流强度的占比；Step 4: Analyze and calculate the proportion of low-altitude atmospheric optical turbulence in the intensity of atmospheric optical turbulence at a specific moment; 步骤5、利用所述近地面大气光学湍流廓线测量和拟合单元实时测量近地面多层大气光学湍流，拟合得到低空大气光学湍流廓线；Step 5: Measure the near-surface atmospheric optical turbulence in real time using the near-surface atmospheric optical turbulence profile measurement and fitting unit, and fit the low-altitude atmospheric optical turbulence profile. 步骤6、根据低空大气光学湍流廓线计算低空大气光学湍流强度，进而根据低空大气光学湍流在大气光学湍流强度的占比得到整层大气光学湍流强度。Step 6: Calculate the intensity of low-altitude atmospheric optical turbulence based on the low-altitude atmospheric optical turbulence profile, and then obtain the intensity of the entire atmospheric optical turbulence layer based on the proportion of low-altitude atmospheric optical turbulence in the overall atmospheric optical turbulence intensity.
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