Method and system for evaluating the influence of atmospheric turbulence on laser communication

Abstract

The application discloses an atmospheric turbulence influence evaluation method and system applied to laser communication, the convergence and sustainability of the motion state among multiple communication test spots are analyzed, the overall motion state of the test spot is evaluated, and finally, the influence of atmospheric turbulence on the light propagation path is evaluated according to the overall motion state of the spot, and then the influence size on the space laser communication is evaluated. The application quantifies the influence of atmospheric turbulence on the light propagation path in the space laser communication, more accurately represents the motion state of the atmospheric turbulence, and has important significance for improving the performance of the space laser communication.

Description

Technical Field

[0001] This invention relates to the field of laser communication technology, and in particular to a method and system for assessing the impact of atmospheric turbulence on laser communication. Background Technology

[0002] Because the atmosphere is constantly in motion, the resulting atmospheric turbulence has a significant impact on the intensity of laser communication signals. Atmospheric turbulence mainly causes two effects: first, random fluctuations in received light intensity due to the random fluctuations in atmospheric refractive index, known as the intensity scintillation effect; and second, random shifts in the center of the light spot at the receiver due to the random motion of the atmosphere, known as the beam drift effect. Assessing the impact of atmospheric turbulence is crucial for improving the performance of space laser communication. Since the effects of atmospheric turbulence are mainly manifested in two aspects—light propagation intensity (intensity scintillation effect) and light propagation path (random shift)—it is necessary to assess the impact of atmospheric turbulence on both aspects separately. Based on this, the applicant proposes a method and system for assessing the impact of atmospheric turbulence on laser communication, primarily used to evaluate the influence of atmospheric turbulence on the light propagation path. Summary of the Invention

[0003] To address the above technical problems, this invention provides a method and system for assessing the impact of atmospheric turbulence on laser communication. By analyzing the convergence and sustainability of the motion states of multiple communication light spots, the impact of current atmospheric turbulence on optical communication is assessed, thereby quantifying the magnitude of the impact of atmospheric turbulence and laying a solid foundation for improving the performance of space laser communication.

[0004] To achieve the above objectives, the present invention provides the following solution: In a first aspect, the present invention provides a method for assessing the impact of atmospheric turbulence on laser communication, comprising the following steps: S1: Record the position offset of each test spot at time t.

[0005] The spot position offset refers to the difference between the position coordinates of a spot at the current time t and the position coordinates of the spot at the previous time. The spot position is the position of the spot formed by the beam projected onto the screen. The spot position can be represented by the coordinates of the spot centroid on the screen. The spot position offset is the difference between the coordinates of the spot centroid on the screen at time t and the coordinates of the spot centroid on the screen at the previous time.

[0006] S2: Calculate the similarity of the offset of spot i with any other spot at time t.

[0007] Offset convergence is used to assess how similar the positional offset of spot i is to any other spot. By evaluating the similarity of the positional offsets between spots, the offset convergence of the spots is obtained, and thus the convergence of the spot motion state is determined. The higher the convergence of the spot motion state, the more regular the atmospheric turbulence motion, and the smaller the impact on communication performance.

[0008] S3: Calculate the similarity of motion between light spot i and other light spots.

[0009] To better describe atmospheric motion, the similarity of motion between the test spot i and other spots should be calculated. By comparing the magnitude of the positional offset with each spot, the similarity of motion among all spots can be determined. This similarity of positional offset can be used to represent the magnitude of the randomness of atmospheric turbulent motion.

[0010] S4: Calculate the motion sustainability of light spot i at different times.

[0011] The convergence of motion of the same light spot i at multiple different times is calculated to quantify the sustainability of the motion of the same light spot. The more stable the motion of the light spot at different times, the smaller the influence of atmospheric turbulence and the stronger the sustainability of the motion. Conversely, the greater the influence of atmospheric turbulence.

[0012] S5: Evaluate the impact factor ζ of atmospheric turbulence.

[0013] The influencing factor ζ of atmospheric turbulence is characterized by combining two parameters: motion sustainability and motion convergence.

[0014] S6: Assess the magnitude of the impact of atmospheric turbulence based on the impact factor ζ.

[0015] The larger the value of ζ, the greater the impact of atmospheric turbulence on laser communication; the smaller the value of ζ, the smaller the impact of atmospheric turbulence on laser communication.

[0016] Secondly, the present invention also provides an atmospheric turbulence impact assessment system for laser communication; the system includes: The position offset calculation module is used to calculate the position offset of the test spot at a certain moment; The offset convergence calculation module is used to calculate the offset convergence between two test spots and the motion convergence between multiple test spots; The motion sustainability calculation module is used to calculate the motion sustainability of the test spot at different times. The impact factor calculation module is used to calculate the impact factors of atmospheric turbulence. The Atmospheric Turbulence Impact Assessment Module is used to assess the magnitude of the impact of atmospheric turbulence based on atmospheric turbulence impact factors.

[0017] Thirdly, the present invention provides an electronic device including a memory and a processor, and computer instructions stored in the memory and running on the processor, wherein the computer instructions, when executed by the processor, perform the method described in the first aspect.

[0018] Fourthly, the present invention provides a computer-readable storage medium for storing computer instructions, which, when executed by a processor, perform the method described in the first aspect.

[0019] The present invention achieves the following technical effects compared to the prior art: Beneficial Effects: This invention analyzes the convergence and sustainability of motion states among multiple communication test spots. By testing the overall motion state of the spots, it ultimately assesses the impact of atmospheric turbulence on the light propagation path, and thus evaluates the magnitude of the impact on space laser communication. This invention quantifies the influence of atmospheric turbulence on the light propagation path in space laser communication, accurately characterizing the motion state of atmospheric turbulence, which is of great significance for improving the performance of space laser communication. Attached Figure Description

[0020] To more clearly illustrate the technical solutions in the embodiments of the present invention or the prior art, the drawings used in the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0021] Figure 1 This is a schematic diagram of the steps of the present invention; Figure 2 This is a side view schematic diagram of the test spot emission scene of the present invention; Figure 3 This is a top-view schematic diagram of the test spot emission scenario for this invention.

[0022] Among them, Figure 2 and Figure 3 In the image, the arrow indicates the transmission path of the test spot. Detailed Implementation

[0023] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0024] The purpose of this invention is to provide a method and system for assessing the impact of atmospheric turbulence on laser communication. This method characterizes the magnitude of the impact of atmospheric turbulence on the transmission path of laser communication light spots. By analyzing the convergence of the motion states of the communication light spot and multiple light spots at a certain moment, the consistency of the motion states is obtained. Furthermore, by judging the motion states of the light spot at different moments, the sustainability of the motion state of the same light spot is calculated. Based on the consistency and sustainability of the motion states of the light spots, the overall motion state of the test light spot is assessed, and the magnitude of the impact of atmospheric turbulence on the optical transmission path of space laser communication is evaluated.

[0025] First, the implementation scenario and approach of this invention will be explained. In the process of completing this invention, multiple light spots need to move synchronously. The impact of atmospheric turbulence is assessed by analyzing the positional changes of the light spots after passing through the atmosphere. To make the analysis results more accurate, at least two light spots need to move synchronously, and the accuracy of the data increases with the number of light spots involved in the test. In this invention, the impact of atmospheric turbulence is assessed by analyzing the relative offset positions between the light spots. Therefore, it is necessary to obtain the positional information between multiple test light spots. In the first scenario, multiple light spots can be projected. By analyzing the positional changes of the projected light spots, the impact of atmospheric turbulence is assessed. For example, multiple light spots can be projected onto a screen at a certain distance from the light emitting device, and the movement of the light spots on the screen can be analyzed. Figure 2 and Figure 3 The illustrated laser beam projection setup involves multiple ground-based laser turntable transmitters emitting laser beams onto an aerial screen, which can be carried by an aircraft. The laser beams are projected onto the screen after passing through the atmosphere. The ground-based laser turntable transmitters are spaced at regular intervals, such as 1 meter apart, ensuring that the beams emitted by each turntable are at the same distance and do not interfere with each other. In another scenario (the second scenario), based on the laser communication process, the pitch angle and angular position of the light receiving device must match the beam position to receive the corresponding light information. Therefore, the pitch angle and angular position information of the light receiving device can be considered as the relative position information of the beam. By using the relative position information of the beam instead of its actual position, the relative offset position of the beam can be calculated. In the two scenarios mentioned above, the light spot information is projected onto the screen through the atmosphere. Since the light spot passes through the atmosphere, it is inevitably affected by atmospheric turbulence, and its position on the screen will inevitably be shifted to a certain extent. Given the randomness of the influence of atmospheric turbulence, the magnitude of the shift of the same light spot at different times is random, and the shift between multiple different light spots is also random. This invention is based on the above-mentioned shift of the same light spot at different times and the shift between different light spots to quantify the influence of atmospheric turbulence on optical communication.

[0026] In a first aspect, the present invention provides a method for assessing the impact of atmospheric turbulence on laser communication, specifically including the following steps: S1: Record the position offset of each test spot at time t.

[0027] Specifically, the light spot position offset refers to the difference between the position coordinates of a light spot at the current time t and the position coordinates of the light spot at the previous time. The light spot position can be the projection position of the light beam, or the direction angle of the receiving device itself when the light receiving device receives the light spot information. In this invention, for ease of description and understanding, the projection position of the light beam is used as the light spot position, that is, the light spot position is the position of the light spot formed by the light beam projected onto the screen. The light spot position can be represented by the coordinates of the center of mass of the light spot on the screen. The light spot position offset is the difference between the coordinates of the center of mass of the light spot on the screen at time t and the coordinates of the center of mass on the screen at the previous time.

[0028] In this step, m light emitting devices emit m light spots. To avoid interference between the light spots, they are emitted at a certain distance from each other. The m light emitting devices emit m parallel beams, and the positions of the m light spots at time t-1 are recorded. At time t, the m light emitting devices are controlled to deflect synchronously by the same amount of displacement, causing the positions of the m light spots to change synchronously. The positions of the m light spots at time t are recorded again. Based on the change in the coordinates of the test light spots, the displacement of each light spot between time t and time t-1 is calculated, and this displacement is taken as the position offset of the light spot at time t. Although the m light emitting devices deflect synchronously by the same amount of displacement, the offset of each light spot will vary randomly due to atmospheric turbulence. Therefore, the position offset of each test light spot may be different. In this invention, the m beams project to form m light spots, thus forming a set of light spot position offsets S={S1,S2,S3,S4,……S}. m}

[0029] S2: Calculate the similarity of the offset of spot i with any other spot at time t.

[0030] Specifically, offset convergence is used to assess how similar the positional offset of light spot i is to any other light spot. In this invention, the offset convergence of light spots is obtained by evaluating the similarity of their positional offsets, thereby determining the convergence of their motion states. The higher the convergence of their motion states, the more regular the atmospheric turbulence, and the smaller the impact on communication performance.

[0031] To facilitate quantification of the position offset S of light spot i at time t i (t) and the position offset S from any other spot j j To address the convergence between (t), this invention employs a membership function to represent the offset S. i (t), S j (t) corresponds to the uniform function C in the range [0,1].ij (t) is used to represent the offset S of spot i at time t. i (t) and the offset S of spot j j The offset convergence between (t).

[0032] Specifically, the deviation convergence C ij (t) is calculated as follows: In the aforementioned offset convergence function C ij In (t), the function range takes continuous values ​​in the interval [0,1]. When the range is closer to 1, it means that the offsets between light spot i and light spot j are closer and the offset convergence is higher. This indicates that the atmospheric turbulence is relatively regular and has little impact on the propagation of the light signal. Conversely, when the range is closer to 0, it means that the offset difference between light spot i and light spot j is greater and the convergence is worse. This indicates that the atmospheric motion is more random and the atmospheric turbulence has a greater impact on the propagation of the light signal.

[0033] S3: Calculate the similarity of motion between spot i and all other spots.

[0034] Comparative data with a single test spot has significant limitations and cannot accurately describe the differences in motion between spots, thus failing to adequately characterize the randomness of atmospheric motion. To better describe atmospheric motion, the convergence of offsets (i.e., motion convergence) between test spot i and other spots should be calculated. By comparing the magnitude of the positional offset with each spot, the motion convergence among all spots is determined, and this positional offset convergence is used to represent the magnitude of the randomness of atmospheric turbulent motion.

[0035] Specifically, the method for calculating motion convergence is as follows: In the above formula, m is the number of test spots, and U i The magnitude of (t) indicates the similarity between the positional offset of test spot i and the positional offsets of other spots, i.e., the similarity of motion among the spots. The greater the similarity of motion, the less the spot is affected by atmospheric turbulence, and the more regular the atmospheric turbulence motion is. The smaller the similarity of motion, the more irregular the spot motion is, the greater the influence of atmospheric turbulence on the spot, and the more irregular the atmospheric turbulence motion is.

[0036] S4: Calculate the motion sustainability of light spot i at different times.

[0037] Through the aforementioned steps, the convergence of motion of each light spot at different times has been quantified, completing the "lateral" comparison between light spots. However, a "vertical" comparison should also be performed, that is, calculating the convergence of motion of the same light spot i at multiple different times, thereby quantifying the motion sustainability of the same light spot. To distinguish the convergence of motion of a certain light spot from that of other light spots, the convergence of motion of the same light spot at different times is called motion sustainability. The more stable the motion of the light spot at different times, the smaller the influence of atmospheric turbulence, and the stronger the motion sustainability. Conversely, the greater the influence of atmospheric turbulence.

[0038] The motion sustainability of light spot i at different times is calculated as follows: In the above formula, S i (t r ) and S i (t s C represents the position offset of the test spot i at time r and time s, respectively. i (t k The symbol ) represents the change in the sustainability of the motion of the test spot i at two different times t. k The positional offset in the variable is a function of the variable t. k It is a time set formed at different times, where k = {1, 2, ..., n}, and r ∈ k, s ∈ k, C i (t k This describes the sustainability of the motion of the same light spot at two different times. Similarly, the range of this function is made to correspond to continuous values ​​in the interval [0,1]. The closer the range is to 1, the more stable the motion of the light spot is within a certain time interval, indicating that the influence of atmospheric turbulence is smaller. Conversely, the closer the range is to 0, the worse the sustainability of the motion of the same light spot at different times, and the greater the influence of atmospheric turbulence.

[0039] To more accurately characterize the sustainability of the motion state of the same light spot, it is necessary to evaluate the changes in the motion state of the same light spot at multiple different times. This involves calculating the motion offset of the same light spot at multiple times, and using the changes in its motion state at multiple times to characterize the sustainability of the motion of the same light spot. The calculation method is as follows: In the above formula, n is the number of time points, and k = {1, 2, ..., n}.

[0040] S5: Calculate the influence factor ζ of atmospheric turbulence.

[0041] In this invention, the influence factor ζ of atmospheric turbulence is used to characterize the magnitude of the impact of atmospheric turbulence on optical communication performance. In the preceding steps, the convergence of motion among multiple light spots and the sustainability of the motion of the same light spot at different times have been determined. The convergence of motion among light spots characterizes the similarity of positional offsets between different light spots. The higher the convergence of positional offsets between different light spots, the more regular the motion of atmospheric turbulence, and the smaller the impact of atmospheric turbulence on communication. The sustainability of motion of the same light spot at different times characterizes the sustainability of similar motions of the light spot; the greater the sustainability, the smaller the impact of atmospheric turbulence. This invention combines the above two parameters, motion sustainability and motion convergence, to characterize the influence factor ζ of atmospheric turbulence.

[0042] The specific calculations are as follows: The above credibility ζ i The value range is between [0, 2]. To more intuitively represent its reliability, the reliability is expressed as a percentage, specifically: Furthermore, to align with common representational habits—that a larger calculated result represents a greater impact of atmospheric turbulence, and a smaller calculated result represents a smaller impact—the inverse of the calculated result is taken to obtain the final impact factor ζ. S6: Assess the magnitude of the impact of atmospheric turbulence based on the impact factor ζ.

[0043] The larger the value of ζ, the greater the impact of atmospheric turbulence on laser communication; the smaller the value of ζ, the smaller the impact of atmospheric turbulence on laser communication.

[0044] In another embodiment, since atmospheric turbulence has a significant impact on the propagation of light, when atmospheric motion is intense, it can severely interfere with the transmission of light signals and even affect the propagation distance of light signals. Considering this factor, during the projection of m beams through the atmosphere, some beams may fail to form a projection. Therefore, the actual light spot formed may be less than m, i.e., light spot loss occurs. When the light spot loss rate is greater than a certain threshold, the value ζ can be directly taken to be infinitely close to 1, which means that the influence of atmospheric turbulence is very large.

[0045] This invention analyzes the convergence and sustainability of the motion states among multiple communication test spots, evaluates the overall motion state of the test spots, and finally assesses the impact of atmospheric turbulence on space laser communication based on the overall motion state of the spots. This invention quantifies the impact of atmospheric turbulence on space laser communication, accurately characterizes the motion state of atmospheric turbulence, and is of great significance for improving the performance of space laser communication.

[0046] Secondly, the present invention also provides an atmospheric turbulence impact assessment system for laser communication; the system includes: a position offset calculation module, an offset convergence calculation module, a motion sustainability calculation module, an impact factor calculation module, and an atmospheric turbulence impact assessment module.

[0047] The position offset calculation module is used to calculate the position offset of the test spot at a certain moment; The offset convergence calculation module is used to calculate the offset convergence between two test spots and the motion convergence between multiple test spots; The aforementioned motion sustainability calculation module is used to calculate the motion sustainability of the test spot at different times; The influence factor calculation module is used to calculate the influence factor of atmospheric turbulence. The atmospheric turbulence impact assessment module is used to assess the magnitude of atmospheric turbulence impact based on atmospheric turbulence impact factors.

[0048] Thirdly, the present invention provides an electronic device, including a memory and a processor, and computer instructions stored in the memory and running on the processor, wherein the computer instructions, when executed by the processor, perform the atmospheric turbulence impact assessment method for laser communication described in the first aspect.

[0049] Furthermore, the present invention provides a computer-readable storage medium for storing computer instructions, which, when executed by a processor, perform the atmospheric turbulence impact assessment method for laser communication described in the first aspect.

[0050] In further embodiments, the present invention also provides: An electronic device includes a memory and a processor, as well as computer instructions stored in the memory and running on the processor. When executed by the processor, the computer instructions perform the atmospheric turbulence impact assessment method for laser communication described in Example 1. For simplicity, further details are omitted here.

[0051] It should be understood that in this embodiment, the processor can be a central processing unit (CPU), or it can be other general-purpose processors, digital signal processors (DSPs), application-specific integrated circuits (ASICs), programmable gate arrays (FPGAs), or other programmable logic devices, discrete gate or transistor logic devices, discrete hardware components, etc. The general-purpose processor can be a microprocessor or any conventional processor, etc.

[0052] Memory may include read-only memory and random access memory, and provides instructions and data to the processor. A portion of memory may also include non-volatile random access memory. For example, memory may also store information about the device type.

[0053] A computer-readable storage medium for storing computer instructions, which, when executed by a processor, perform the atmospheric turbulence impact assessment method for laser communication described in Embodiment 1.

[0054] The method in Example 1 can be directly implemented by a hardware processor, or implemented by a combination of hardware and software modules within the processor. The software modules can reside in readily available storage media in the field, such as random access memory, flash memory, read-only memory, programmable read-only memory, electrically erasable programmable memory, or registers. This storage medium is located in memory, and the processor reads information from the memory and, in conjunction with its hardware, completes the steps of the above method. To avoid repetition, a detailed description is not provided here.

[0055] Those skilled in the art will recognize that the units, i.e., algorithm steps, of the various examples described in connection with this embodiment can be implemented in electronic hardware or a combination of computer software and electronic hardware. Whether these functions are implemented in hardware or software depends on the specific application and design constraints of the technical solution. Those skilled in the art can use different methods to implement the described functions for each specific application, but such implementation should not be considered beyond the scope of this application.

[0056] The above are merely preferred embodiments of the present invention and are not intended to limit the present invention. Various modifications and variations can be made to the present invention by those skilled in the art. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the present invention should be included within the scope of protection of the present invention.

[0057] This specification uses specific examples to illustrate the principles and implementation methods of the present invention. The descriptions of the above embodiments are only for the purpose of helping to understand the method and core ideas of the present invention. Furthermore, those skilled in the art will recognize that, based on the ideas of the present invention, there will be changes in the specific implementation methods and application scope. Those skilled in the art should understand that, based on the technical solutions of the present invention, various modifications or variations that can be made by those skilled in the art without creative effort are still within the protection scope of the present invention.

[0058] In summary, the contents of this specification should not be construed as limiting the present invention.

Claims

1. A method for assessing the impact of atmospheric turbulence on laser communication, characterized in that, Includes the following steps: Step 1: Record the position offset of each test spot at time t; Step 2: Calculate the similarity of the offset of spot i with any other spot at time t; the similarity of the offset is used to evaluate how similar the positional offset of spot i is with any other spot. Step 3: Calculate the motion sustainability of spot i at different times; the motion sustainability refers to the motion convergence of the same spot i at multiple different times; the motion convergence refers to the similarity of the offset of spot i with other spots. Step 4: Calculate the influence factor ζ of atmospheric turbulence based on the convergence and sustainability of the light spot's motion; Step 5: Assess the magnitude of the impact of atmospheric turbulence based on the impact factor ζ.

2. The method for assessing the impact of atmospheric turbulence on laser communication according to claim 1, characterized in that, In step two, the method for calculating the offset convergence is as follows: The membership function is used to determine the test spot offset S. i (t), S j (t) corresponds to the uniform function C in the range [0,1]. ij (t) represents the offset S of the test spot i at time t. i (t) and the offset S of the test spot j j The offset convergence between (t); Deviation convergence C ij (t) is calculated as follows: C i j t = e x p - 1 2 S i t - S j t In the aforementioned offset convergence function C ij In (t), the function range takes continuous values ​​in the interval [0,1]. When the range is closer to 1, it means that the offset between spot i and spot j is closer, and the atmospheric turbulence has less impact on the propagation of the light signal. Conversely, when the range is closer to 0, it means that the offset difference between spot i and spot j is greater, and the atmospheric motion has a greater impact on the propagation of the light signal.

3. The method for assessing the impact of atmospheric turbulence on laser communication according to claim 1, characterized in that, In step three, motion sustainability represents the motion similarity of the same light spot at different times. The method for calculating motion sustainability is as follows: First, the sustainability of the test spot's motion at two different times is calculated using the following method: C i t k = e x p - 1 2 S i t r - S i t s In the above formula, S i (t r ) and S i (t s C represents the position offset of the test spot i at time r and time s, respectively. i (t k ) represents the change in the sustainability of the motion of the test spot i at two different times, where t k It is a time set formed at different times, where k = {1, 2, ..., n}, and r ∈ k, s ∈ k, C i (t k The function describes the sustainability of the motion of the same light spot at two different times, so that the range of the function corresponds to continuous values ​​in the interval [0,1]. When the range is closer to 1, it means that the motion state of the light spot is more stable within a certain time interval, indicating that the influence of atmospheric turbulence is smaller. Conversely, when the range is closer to 0, it means that the sustainability of the motion of the same light spot at different times is worse, and the influence of atmospheric turbulence is greater. Secondly, the changes in the motion state of the same light spot at multiple different times are evaluated. This is done by calculating the motion offset of the same light spot at multiple times, and the changes in the motion state at multiple times characterize the motion sustainability of the same light spot. The calculation method is as follows: In the above formula, n is the number of time points, and k = {1, 2, ..., n}.

4. The method for assessing the impact of atmospheric turbulence on laser communication according to claim 2, characterized in that, Step three also includes: Calculate the motion convergence of light spot i with all other test light spots; specifically, the method for calculating motion convergence is as follows: Where m is the number of all other test spots.

5. The method for assessing the impact of atmospheric turbulence on laser communication according to any one of claims 1-4, characterized in that, The specific characterization method for the influencing factor ζ is as follows: it is characterized by the sum of the convergence of light spot motion and the sustainability of motion.

6. The method for assessing the impact of atmospheric turbulence on laser communication according to claim 5, characterized in that, The specific calculation method for the influence factor ζ is as follows: in, ; Among them, U i (t) characterizes the similarity of motion between light spot i and other light spots, U i (t k This characterizes the motion sustainability of light spot i.

7. The method for assessing the impact of atmospheric turbulence on laser communication according to claim 1, characterized in that, When the spot loss rate is greater than a certain threshold, the value ζ is directly taken to be infinitely close to 1, which means that the influence of atmospheric turbulence is very large.

8. An electronic device, characterized in that, It includes a memory and a processor, as well as computer instructions stored in the memory and running on the processor, which, when executed by the processor, perform the method according to any one of claims 1-7.

9. A computer-readable storage medium, characterized in that, Used to store computer instructions, which, when executed by a processor, perform the method described in any one of claims 1-7.

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