Adaptive frequency modulation method and device in quantum laser communication

Abstract

The invention relates to the technical field of frequency modulation, and discloses an adaptive frequency modulation method and device in quantum laser communication, and the method comprises the steps: obtaining the transmission distance of a quantum laser communication link, and determining an initial modulation slope according to the transmission distance; acquiring electromagnetic field intensity, environmental parameters and noise level of the quantum laser communication link; judging whether the current electromagnetic field affects the quantum laser communication link or not according to the electromagnetic field intensity; respectively correcting the initial modulation slope or the initial frequency modulation signal under the condition that the influence is generated or not generated to obtain a corrected frequency modulation signal; the initial frequency modulation signal is generated according to the initial modulation slope; and performing data coding on the to-be-transmitted data based on the corrected frequency modulation signal, and transmitting the to-be-transmitted data through the quantum laser communication link. According to the invention, by monitoring and adjusting the frequency modulation signal in real time, the stability and anti-interference capability of quantum laser communication are significantly improved, and the reliability and high efficiency of data transmission are ensured.

Description

Technical Field

[0001] The present invention relates to the technical field of frequency modulation, and in particular, to an adaptive frequency modulation method and device in quantum laser communication. Background Art

[0002] With the rapid development of information technology, the demand for high-speed, secure, and reliable communication is increasing day by day. As an emerging communication technology, quantum communication uses the principles of quantum mechanics to achieve information transmission, has ultra-high security and potential high-speed transmission capabilities, and has become a research hotspot in the communication field.

[0003] However, existing quantum laser communication technologies are prone to interference from factors such as electromagnetic field strength, environmental conditions, and noise levels in practical applications, resulting in a sharp decline in communication performance and unable to meet the requirements of high stability and high reliability communication in practical applications.

[0004] Therefore, there is an urgent need for an adaptive frequency modulation method in quantum laser communication, an adaptive method for automatically adjusting frequency modulation parameters, to overcome the adverse effects brought by environmental factors and noise interference. Summary of the Invention

[0005] The purpose of the present invention is to provide an adaptive frequency modulation method and device in quantum laser communication, aiming to solve the problem that current quantum laser communication is easily affected by environmental factors and noise interference, resulting in a decline in communication performance.

[0006] In a first aspect, the present invention provides an adaptive frequency modulation method in quantum laser communication, including: obtaining the transmission distance of a quantum laser communication link, and determining an initial modulation slope according to the transmission distance; obtaining the electromagnetic field strength, environmental parameters, and noise level of the quantum laser communication link, where the environmental parameters include at least one of a temperature value, a humidity value, a wind speed, and an atmospheric turbulence intensity; judging whether the current electromagnetic field affects the quantum laser communication link according to the electromagnetic field strength; if it has an impact, determining an electromagnetic field impact coefficient of the quantum laser communication link according to the electromagnetic field strength, and adjusting the initial modulation slope according to the electromagnetic field impact coefficient to obtain an adjusted modulation slope, generating an adjusted frequency modulation signal based on the adjusted modulation slope, and correcting the adjusted frequency modulation signal according to the environmental parameters and the noise level to obtain a corrected frequency modulation signal; if it has no impact, correcting the initial frequency modulation signal according to the environmental parameters and the noise level to obtain a corrected frequency modulation signal; where the initial frequency modulation signal is generated according to the initial modulation slope; encoding the data to be transmitted based on the corrected frequency modulation signal and transmitting it through the quantum laser communication link.

[0007] In some embodiments, determining an initial modulation slope according to a transmission distance includes: determining the initial modulation slope according to the relationship between the transmission distance and a first preset transmission distance and the relationship between the transmission distance and a second preset transmission distance; the first preset transmission distance is less than the second preset transmission distance; if the transmission distance is less than the first preset transmission distance, determining the initial modulation slope as a first preset initial modulation slope; if the transmission distance is greater than or equal to the first preset transmission distance and less than the second preset transmission distance, determining the initial modulation slope as a second preset initial modulation slope; if the transmission distance is greater than or equal to the second preset transmission distance, determining the initial modulation slope as a third preset initial modulation slope; wherein, the first preset initial modulation slope is greater than the second preset initial modulation slope, and the second preset initial modulation slope is greater than the third preset initial modulation slope.

[0008] In some embodiments, an electromagnetic field intensity, an environmental parameter, and a noise level are collected by a sensor assembly; the sensor assembly includes: an electromagnetic field intensity sensor for detecting the electromagnetic field intensity of the environment where a quantum laser communication link is located; a temperature sensor for detecting the temperature value of the environment where the quantum laser communication link is located; a humidity sensor for detecting the humidity value of the environment where the quantum laser communication link is located; an anemometer for detecting the wind speed of the environment where the quantum laser communication link is located; a scintillometer for detecting the atmospheric turbulence intensity of the environment where the quantum laser communication link is located; a photodetector for detecting the noise power spectral density of the quantum laser communication link.

[0009] In some embodiments, the noise level is determined according to the noise power spectral density; the noise level is determined according to the following formula:

[0010] N = ∫S(f)df;

[0011] wherein, N represents the noise level, and S(f) represents the noise power spectral density.

[0012] In some embodiments, determining whether a current electromagnetic field affects a quantum laser communication link according to the electromagnetic field intensity includes: comparing the electromagnetic field intensity with a preset electromagnetic field intensity, if the electromagnetic field intensity is less than the preset electromagnetic field intensity, determining that the current electromagnetic field does not affect the quantum laser communication link; if the electromagnetic field intensity is greater than or equal to the preset electromagnetic field intensity, determining that the current electromagnetic field affects the quantum laser communication link.

[0013] In some embodiments, determining an electromagnetic field influence coefficient of a quantum laser communication link according to the electromagnetic field intensity and adjusting the initial modulation slope according to the electromagnetic field influence coefficient to obtain an adjusted modulation slope includes: the electromagnetic field influence coefficient is calculated according to the following formula:

[0014] k = d·e mE ;

[0015] Among them, k represents the electromagnetic field influence coefficient, E represents the electromagnetic field strength, and d and m represent constants;

[0016] Compare the electromagnetic field influence coefficient with the preset influence coefficient. If the electromagnetic field influence coefficient is less than the preset influence coefficient, adjust the initial modulation slope according to the electromagnetic field influence coefficient to obtain the adjusted modulation slope; the adjusted modulation slope is determined according to the following formula:

[0017] M = M0×(1 + ak);

[0018] Among them, M represents the adjusted modulation slope, M0 represents the initial modulation slope, a represents a constant, and a < 1;

[0019] If the electromagnetic field influence coefficient is greater than or equal to the preset influence coefficient, the adjusted modulation slope is determined according to the following formula:

[0020] M = M0×bk;

[0021] Among them, b represents a constant.

[0022] In some embodiments, before correcting the adjusted frequency modulation signal according to the environmental parameters and the noise level, or before correcting the initial frequency modulation signal according to the environmental parameters and the noise level, it further includes: determining the change amount of the frequency modulation signal according to the environmental parameters and the noise level; the change amount of the frequency modulation signal is determined according to the following formula:

[0023]

[0024] Among them, x1 = T, x2 = H, x3 = V, x4 = I, T represents the temperature value, H represents the humidity value, V represents the wind speed, and I represents the atmospheric turbulence intensity; x 10 represents the standard temperature value, x 20 represents the standard humidity value, x 30 represents the standard wind speed, x 40 represents the standard atmospheric turbulence intensity;

[0025] a i represents the first-order coefficient of each parameter of the environmental parameters, b ij represents the second-order interaction coefficient between the environmental parameters, c1 represents the first-order coefficient of the noise level, d i represents the interaction coefficient between the noise and each environmental parameter, e1 represents the second-order coefficient of the noise level, N represents the noise level, ∈ represents the random error term; where i = 1, 2, 3, 4; j = i + 1, i + 2,..., 4.

[0026] In some embodiments, the adjusted frequency modulation signal is corrected according to environmental parameters and noise level to obtain a corrected frequency modulation signal, including: correcting the adjusted frequency modulation signal based on the change amount of the frequency modulation signal to obtain a corrected frequency modulation signal, and the corrected frequency modulation signal is equal to the sum of the adjusted frequency modulation signal and the change amount of the frequency modulation signal.

[0027] In some embodiments, the initial frequency modulation signal is corrected according to environmental parameters and noise level to obtain a corrected frequency modulation signal, including: correcting the initial frequency modulation signal based on the change amount of the frequency modulation signal to obtain a corrected frequency modulation signal, and the corrected frequency modulation signal is equal to the sum of the initial frequency modulation signal and the change amount of the frequency modulation signal.

[0028] In some embodiments, the data to be transmitted is encoded based on the corrected frequency modulation signal and transmitted through a quantum laser communication link, including: encoding the data to be transmitted according to a preset encoding rule, modulating the encoded data to be transmitted based on the corrected frequency modulation signal, and sending the modulated data to be transmitted to a receiving end through the quantum laser communication link.

[0029] In a second aspect, an adaptive frequency modulation device in quantum laser communication is provided, including: an acquisition unit and a processing unit; the acquisition unit is configured to acquire the transmission distance of the quantum laser communication link; the processing unit is configured to determine an initial modulation slope according to the transmission distance; the acquisition unit is further configured to acquire the electromagnetic field strength, environmental parameters and noise level of the quantum laser communication link, and the environmental parameters include at least one of a temperature value, a humidity value, a wind speed and an atmospheric turbulence intensity; the processing unit is further configured to determine whether the current electromagnetic field affects the quantum laser communication link according to the electromagnetic field strength; if it has an impact, determining an electromagnetic field impact coefficient of the quantum laser communication link according to the electromagnetic field strength, adjusting the initial modulation slope according to the electromagnetic field impact coefficient to obtain an adjusted modulation slope, generating an adjusted frequency modulation signal based on the adjusted modulation slope, and correcting the adjusted frequency modulation signal according to the environmental parameters and noise level to obtain a corrected frequency modulation signal; if there is no impact, correcting the initial frequency modulation signal according to the environmental parameters and noise level to obtain a corrected frequency modulation signal; wherein, the initial frequency modulation signal is generated according to the initial modulation slope; the processing unit is further configured to encode the data to be transmitted based on the corrected frequency modulation signal and transmit it through the quantum laser communication link.

[0030] In a third aspect, an adaptive frequency modulation device in quantum laser communication is provided, including a memory and a processor; the memory is used to store computer-executable instructions, and the processor is connected to the memory through a bus; when the adaptive frequency modulation device in quantum laser communication runs, the processor executes the computer-executable instructions stored in the memory, so that the adaptive frequency modulation device in quantum laser communication executes the adaptive frequency modulation method in quantum laser communication described in the first aspect.

[0031] The adaptive frequency modulation device in quantum laser communication can be a network device or a part of a network device, such as a chip system in a network device. The chip system is used to support the network device to implement the functions involved in the first aspect and any possible implementation thereof. For example, it acquires, determines, and sends the data and / or information involved in the adaptive frequency modulation method in the above-mentioned quantum laser communication. The chip system includes a chip and may also include other discrete devices or circuit structures.

[0032] In a fourth aspect, a computer-readable storage medium is provided. The computer-readable storage medium includes computer-executable instructions. When the computer-executable instructions run on a computer, the computer executes the adaptive frequency modulation method in quantum laser communication described in the first aspect.

[0033] In a fifth aspect, a computer program product is further provided. The computer program product includes computer instructions. When the computer instructions run on the adaptive frequency modulation device in quantum laser communication, the adaptive frequency modulation device in quantum laser communication executes the adaptive frequency modulation method in quantum laser communication described in the first aspect as above.

[0034] It should be noted that the above computer instructions can be stored in whole or in part on the computer-readable storage medium. Among them, the computer-readable storage medium can be packaged together with the processor of the adaptive frequency modulation device in quantum laser communication or separately packaged from the processor of the adaptive frequency modulation device in quantum laser communication. The embodiments of the present application do not make any limitations in this regard.

[0035] The descriptions of the second aspect, the third aspect, the fourth aspect, and the fifth aspect in this application can refer to the detailed description of the first aspect.

[0036] In the embodiments of the present application, the name of the above-mentioned adaptive frequency modulation device in quantum laser communication does not limit the device or functional module itself. In actual implementation, these devices or functional modules may appear under other names. For example, the processing unit can also be called a processing module, a processor, etc. As long as the functions of each device or functional module are similar to those of this application and fall within the scope of the claims of this application and equivalent technologies.

[0037] Compared with the prior art, the present invention can significantly improve the stability and anti-interference ability of quantum laser communication by real-time monitoring of the quantum laser communication link and adjusting the frequency modulation signal, ensuring the reliability and efficiency of data transmission. At the same time, it can effectively cope with the impact brought by complex environmental changes, extend the communication distance, and improve the communication quality.

[0038] The present invention determines the initial modulation slope according to the transmission distance and dynamically adjusts it according to the electromagnetic field strength, environmental parameters, and noise level, making the frequency modulation more accurate and efficient. This adaptive ability can significantly improve the stability and reliability of quantum laser communication. By real-time collecting and analyzing environmental parameters such as electromagnetic field strength, temperature, humidity, wind speed, and atmospheric turbulence intensity, as well as the noise level, the system can timely adjust and correct the frequency modulation signal. This helps to cope with various complex and changeable environmental conditions and ensure that the communication quality is not interfered by external factors. Introducing the electromagnetic field influence coefficient enables the system to quantify the specific influence degree of the electromagnetic field on the quantum laser communication link, thereby more targeted adjusting the modulation slope. This method improves the anti-interference ability and adaptability of the system. Based on the corrected frequency modulation signal for data encoding and transmission, the bit error rate can be effectively reduced, and the accuracy and efficiency of data transmission can be improved. BRIEF DESCRIPTION OF THE DRAWINGS

[0039] In order to more clearly illustrate the technical solutions in the embodiments of the present invention or the prior art, the following will briefly introduce the drawings required for the description of the embodiments or the prior art. Obviously, the drawings in the following description are only the embodiments of the present invention. For those of ordinary skill in the art, other drawings can be obtained according to the provided drawings without creative efforts.

[0040] Figure 1 It is a schematic structural diagram of an adaptive frequency modulation system provided by an embodiment of the present application;

[0041] Figure 2 It is a schematic hardware structure diagram of an adaptive frequency modulation device provided by an embodiment of the present application;

[0042] Figure 3 It is a schematic flow diagram of an adaptive frequency modulation method provided by an embodiment of the present application;

[0043] Figure 4 It is a schematic flow diagram of another adaptive frequency modulation method provided by an embodiment of the present application;

[0044] Figure 5 It is a schematic flow diagram of another adaptive frequency modulation method provided by an embodiment of the present application;

[0045] Figure 6Schematic flowchart of another adaptive frequency modulation method provided by an embodiment of this application;

[0046] Figure 7 Schematic structural diagram of an adaptive frequency modulation device provided by an embodiment of this application. Detailed implementation manners

[0047] Next, the technical solutions in the embodiments of this application will be clearly and completely described in conjunction with the accompanying drawings in the embodiments of this application. Obviously, the described embodiments are only some of the embodiments of this application, rather than all embodiments. Based on the embodiments in this application, all other embodiments obtained by those of ordinary skill in the art without creative efforts shall fall within the protection scope of this application.

[0048] It should be noted that in the embodiments of this application, words such as "exemplary" or "for example" are used to represent examples, illustrations or explanations. Any embodiment or design solution described as "exemplary" or "for example" in the embodiments of this application should not be construed as being more preferred or having more advantages than other embodiments or design solutions. Exactly speaking, using words such as "exemplary" or "for example" aims to present relevant concepts in a specific manner.

[0049] To facilitate a clear description of the technical solutions in the embodiments of this application, in the embodiments of this application, words such as "first" and "second" are used to distinguish identical items or similar items with basically the same functions and effects. Those skilled in the art can understand that words such as "first" and "second" do not limit the quantity and execution order.

[0050] As one of the important implementation methods of quantum communication, quantum laser communication faces many challenges in practical applications. In a quantum laser communication link, the transmission of signals is affected by various factors. First of all, environmental factors have a significant impact on communication quality. Changes in temperature will cause the refractive index of the optical transmission medium to change, and then cause the frequency of the optical signal to drift. Fluctuations in humidity will affect the concentration and properties of particles in the air, resulting in changes in the scattering and absorption of light, and interfering with signal transmission. The magnitude and direction of the wind speed will not only cause instability of the optical transmission path, but may also change the atmospheric pressure and density distribution, indirectly affecting the propagation characteristics of the optical signal. The intensity of atmospheric turbulence directly causes severe fluctuations in the phase and amplitude of the optical signal, resulting in serious distortion and attenuation of the signal.

[0051] Secondly, various noise sources existing inside and outside the communication system also seriously threaten the quality and integrity of the signal. These noises include but are not limited to thermal noise, shot noise, environmental electromagnetic interference, etc. They exhibit a complex power spectrum distribution at different frequencies, and are superimposed on the signal, greatly increasing the bit error rate of the signal and reducing the reliability and recognizability of communication.

[0052] Existing quantum laser communication technologies often adopt a frequency modulation method with fixed parameters when facing these complex and changeable environmental conditions and noise interferences, and it is difficult to adapt to the changes in the communication link state in real time. This leads to a sharp decline in communication performance in the case of harsh environments or strong noise, and it cannot meet the requirements of high stability and high reliability communication in practical applications. For example, in the long-distance quantum communication satellite-ground link, due to the highly dynamic changes in the atmospheric environment and the complexity of the ground electromagnetic environment, the fixed frequency modulation method cannot effectively cope with the problems of signal attenuation and distortion, resulting in a significant reduction in the effective data transmission rate of the communication, and may even lead to communication interruption.

[0053] Therefore, there is an urgent need for an innovative adaptive frequency modulation method in quantum laser communication to overcome the limitations of the existing technologies. This method can monitor and adjust the frequency modulation signal in real time, can significantly improve the stability and anti-interference ability of quantum laser communication, and ensure the reliability and efficiency of data transmission.

[0054] In this case, the embodiment of the present application provides an adaptive frequency modulation method in quantum laser communication, including: obtaining the transmission distance of the quantum laser communication link, and determining the initial modulation slope according to the transmission distance; obtaining the electromagnetic field strength, environmental parameters and noise level of the quantum laser communication link, where the environmental parameters include at least one of temperature value, humidity value, wind speed and atmospheric turbulence intensity; judging whether the current electromagnetic field affects the quantum laser communication link according to the electromagnetic field strength; if it has an impact, determining the electromagnetic field impact coefficient of the quantum laser communication link according to the electromagnetic field strength, and adjusting the initial modulation slope according to the electromagnetic field impact coefficient to obtain an adjusted modulation slope, generating an adjusted frequency modulation signal based on the adjusted modulation slope, and correcting the adjusted frequency modulation signal according to the environmental parameters and noise level to obtain a corrected frequency modulation signal; if it has no impact, correcting the initial frequency modulation signal according to the environmental parameters and noise level to obtain a corrected frequency modulation signal; where the initial frequency modulation signal is generated according to the initial modulation slope; encoding the data to be transmitted based on the corrected frequency modulation signal, and transmitting it through the quantum laser communication link.

[0055] As can be seen from the above, the present application realizes the real-time monitoring of the environment where the quantum laser communication link is located by obtaining the transmission distance, electromagnetic field strength, environmental parameters and noise level of the quantum laser communication link, and improves the accuracy of frequency modulation in quantum laser communication. Secondly, by judging whether the current electromagnetic field affects the quantum laser communication link according to the electromagnetic field strength, and correcting the initial modulation slope or the initial frequency modulation signal respectively in the case of having an impact or not having an impact, the security and accuracy of quantum laser communication are improved.

[0056] The above-mentioned adaptive frequency modulation method in quantum laser communication can be applied to an adaptive frequency modulation system. Figure 1 The structural schematic diagram of the adaptive frequency modulation system is shown. As Figure 1 shown, the adaptive frequency modulation system includes: a sensor group 101 and an adaptive frequency modulation device 102. Among them, the sensor group 101 includes multiple sensors.

[0057] The sensors in the sensor group 101 may include an electromagnetic field strength sensor, a temperature sensor, a humidity sensor, a wind speed sensor, a scintillometer, and a photodetector, etc. The electromagnetic field strength sensor is usually used to detect the electromagnetic field strength of the environment where the object to be detected is located. The temperature sensor is usually used to detect the temperature value of the environment where the object to be detected is located. The humidity sensor is usually used to detect the humidity value of the environment where the object to be detected is located. The wind speed sensor is usually used to detect the wind speed of the environment where the object to be detected is located. The scintillometer is usually used to detect the atmospheric turbulence intensity of the environment where the object to be detected is located. The photodetector is usually used to detect the noise power spectral density of the object to be detected.

[0058] The adaptive frequency modulation device 102 is used to obtain parameters such as the electromagnetic field strength, temperature value, humidity value, wind speed, atmospheric turbulence intensity, and noise power spectral density collected by the sensors in the sensor group 101, and correct the frequency modulation signal in the quantum laser communication link according to the above parameters.

[0059] Optionally, the physical device of the adaptive frequency modulation device 102 may be a server, or a terminal, or other types of electronic devices, and the embodiments of the present application do not limit this.

[0060] Optionally, the above terminal may be at least one of devices such as a smart phone, a smart watch, a desktop computer, a laptop computer, a virtual reality terminal, an augmented reality terminal, a wireless terminal, and a laptop portable computer.

[0061] Optionally, the above server may be a server in a server cluster (composed of multiple servers), or a chip in the server, or a system on chip in the server, or may be implemented by a virtual machine (virtual machine, VM) deployed on a physical machine, and the embodiments of the present application do not limit this.

[0062] The basic hardware structure of the adaptive frequency modulation device 102 includes Figure 2 the components included in the adaptive frequency modulation device in the quantum laser communication shown. Below, taking Figure 2 the adaptive frequency modulation device shown as an example, the hardware structure of the adaptive frequency modulation device 102 is introduced.

[0063] As Figure 2As shown in the figure, it is a schematic diagram of a hardware structure of an adaptive frequency modulation device in quantum laser communication provided by an embodiment of the present application. The adaptive frequency modulation device includes a processor 21, a memory 22, a communication interface 23, and a bus 24. The processor 21, the memory 22, and the communication interface 23 can be connected through the bus 24.

[0064] The processor 21 is the control center of the adaptive frequency modulation device, which can be a single processor or a collective term for multiple processing elements. For example, the processor 21 can be a general-purpose central processing unit (CPU), or other general-purpose processors. Among them, the general-purpose processor can be a microprocessor or any conventional processor, etc.

[0065] As an embodiment, the processor 21 can include one or more CPUs, such as Figure 2 the CPUs 0 and 1 shown in the figure.

[0066] The memory 22 can be a read-only memory (ROM) or other types of static storage devices that can store static information and instructions, a random access memory (RAM) or other types of dynamic storage devices that can store information and instructions, or an electrically erasable programmable read-only memory (EEPROM), a disk storage medium, or other magnetic storage devices, or any other medium that can be used to carry or store the desired program code in the form of instructions or data structures and can be accessed by a computer, but is not limited thereto.

[0067] In a possible implementation, the memory 22 can exist independently of the processor 21. The memory 22 can be connected to the processor 21 through the bus 24 for storing instructions or program codes. When the processor 21 calls and executes the instructions or program codes stored in the memory 22, it can implement the adaptive frequency modulation method provided by the following embodiments of the present application.

[0068] In the embodiments of the present application, for the adaptive frequency modulation device 102, the software programs stored in the memory 22 are different, so the functions implemented by the adaptive frequency modulation device 102 are different. The functions executed by each device will be described in combination with the following flowcharts.

[0069] In another possible implementation, the memory 22 can also be integrated with the processor 21.

[0070] A communication interface 23 is used for the adaptive frequency modulation device to connect with other devices through a communication network, which can be an Ethernet, a radio access network, a wireless local area network (WLAN), etc. The communication interface 23 may include a receiving unit for receiving data and a transmitting unit for transmitting data.

[0071] A bus 24 can be an Industry Standard Architecture (ISA) bus, a Peripheral Component Interconnect (PCI) bus, an Extended Industry Standard Architecture (EISA) bus, etc. This bus can be divided into an address bus, a data bus, a control bus, etc. For the sake of simplicity in representation, Figure 2 only a thick line is used to represent it in the figure, but it does not mean that there is only one bus or one type of bus.

[0072] It should be noted that Figure 2 the structure shown in the figure does not constitute a limitation on the adaptive frequency modulation device. Except Figure 2 for the components shown, the adaptive frequency modulation device may include more or fewer components than those shown in the figure, or combine certain components, or have different component arrangements.

[0073] The adaptive frequency modulation method provided by the embodiments of the present application will be introduced in detail below with reference to the accompanying drawings.

[0074] The adaptive frequency modulation method provided by the embodiments of the present application is applied to Figure 1 the adaptive frequency modulation device 102 in the adaptive frequency modulation system shown in the figure. As Figure 3 shown in the figure, the adaptive frequency modulation method includes:

[0075] S301. Obtain the transmission distance of the quantum laser communication link, and determine the initial modulation slope according to the transmission distance.

[0076] In some embodiments, an initial modulation slope is determined according to the relationship between the transmission distance and a first preset transmission distance, and the relationship between the transmission distance and a second preset transmission distance; the first preset transmission distance is less than the second preset transmission distance; if the transmission distance is less than the first preset transmission distance, the initial modulation slope is determined to be a first preset initial modulation slope; if the transmission distance is greater than or equal to the first preset transmission distance and less than the second preset transmission distance, the initial modulation slope is determined to be a second preset initial modulation slope; if the transmission distance is greater than or equal to the second preset transmission distance, the initial modulation slope is determined to be a third preset initial modulation slope; wherein, the first preset initial modulation slope is greater than the second preset initial modulation slope, and the second preset initial modulation slope is greater than the third preset initial modulation slope.

[0077] Specifically, when designing and configuring a communication system, the modulation slope is a key parameter that affects the transmission quality and efficiency of the signal. To optimize the performance of the communication system, the initial modulation slope can be set according to different transmission distances.

[0078] Exemplarily, first, two preset transmission distances are set, namely a first preset transmission distance D1 and a second preset transmission distance D2. D1 should be less than D2, so as to form a segmentation of the distance range. Second, the relationship between the actual transmission distance D and the two preset distances D1 and D2 is determined, and the initial modulation slope is set according to the distance. Such a setting can ensure that the communication system can operate with the optimal modulation slope at different transmission distances, thereby achieving the optimal communication effect.

[0079] S302. Obtain the electromagnetic field strength, environmental parameters, and noise level of the quantum laser communication link, and determine whether the current electromagnetic field affects the quantum laser communication link according to the electromagnetic field strength.

[0080] In some embodiments, the electromagnetic field strength, environmental parameters, and noise level are collected by a sensor assembly; the sensor assembly includes: an electromagnetic field strength sensor for detecting the electromagnetic field strength of the environment where the quantum laser communication link is located; a temperature sensor for detecting the temperature value of the environment where the quantum laser communication link is located; a humidity sensor for detecting the humidity value of the environment where the quantum laser communication link is located; a wind speed sensor for detecting the wind speed of the environment where the quantum laser communication link is located; a scintillometer for detecting the atmospheric turbulence intensity of the environment where the quantum laser communication link is located; and a photodetector for detecting the noise power spectral density of the quantum laser communication link.

[0081] Specifically, the above-mentioned sensor components work together to ensure that the quantum laser communication link can operate under optimal environmental conditions, thereby improving the stability and reliability of communication. The electromagnetic field intensity sensor can monitor any electromagnetic interference that may disrupt the quantum signal, while the temperature and humidity sensors can ensure that the environmental conditions do not have a negative impact on the device performance. The wind speed sensor and the scintillometer focus on atmospheric conditions, especially the wind speed and the turbulence intensity, which may affect the propagation of the laser beam. The photodetector focuses on detecting and quantifying the noise level to ensure that the noise does not exceed the acceptable range, thereby ensuring the purity of the communication link. By monitoring these key parameters in real time, the system can be adjusted and optimized in a timely manner to cope with environmental changes and ensure the efficient and secure operation of the quantum communication link.

[0082] In some embodiments, the noise level is determined according to the noise power spectral density; the noise level is determined according to the following formula:

[0083] N = ∫S(f)df;

[0084] where, N represents the noise level, and S(f) represents the noise power spectral density.

[0085] S303. If there is an impact, then determine the electromagnetic field impact coefficient of the quantum laser communication link according to the electromagnetic field intensity, and adjust the initial modulation slope according to the electromagnetic field impact coefficient to obtain an adjusted modulation slope. Generate an adjusted frequency modulation signal based on the adjusted modulation slope, and correct the adjusted frequency modulation signal according to the environmental parameters and the noise level to obtain a corrected frequency modulation signal.

[0086] In some embodiments, first determine whether the current electromagnetic field has an impact on the quantum laser communication link through the electromagnetic field intensity. If there is an impact, then obtain an adjusted modulation slope by adjusting the initial modulation slope, generate an adjusted frequency modulation signal according to the adjusted modulation slope, and correct the adjusted frequency modulation signal to obtain a corrected frequency modulation signal.

[0087] Specifically, the adaptive frequency modulation device determines the change amount of the frequency modulation signal according to the environmental parameters and the noise level, and corrects the modulated frequency modulation signal through the change amount of the frequency modulation signal to obtain a corrected frequency modulation signal, and the corrected frequency modulation signal is equal to the sum of the change amount of the frequency modulation signal and the modulated frequency modulation signal.

[0088] S304. If there is no impact, then correct the initial frequency modulation signal according to the environmental parameters and the noise level to obtain a corrected frequency modulation signal.

[0089] In some embodiments, determine whether the current electromagnetic field has an impact on the quantum laser communication link through the electromagnetic field intensity. If there is no impact, then directly correct the initial frequency modulation signal to obtain a corrected frequency modulation signal.

[0090] Specifically, the adaptive frequency modulation device determines the change amount of the frequency modulation signal according to the environmental parameters and the noise level, modifies the initial frequency modulation signal through the change amount of the frequency modulation signal to obtain a corrected frequency modulation signal, and the corrected frequency modulation signal is equal to the sum of the change amount of the frequency modulation signal and the initial frequency modulation signal.

[0091] S305. Perform data encoding on the data to be transmitted based on the corrected frequency modulation signal, and transmit it through the quantum laser communication link.

[0092] In some embodiments, the data to be transmitted is encoded according to a predetermined encoding rule, the encoded data to be transmitted is modulated using the corrected frequency modulation signal, and the modulated data to be transmitted is sent to the receiving end through the quantum laser communication link.

[0093] Specifically, first, the data to be transmitted is preprocessed according to the encoding rules. These rules define how to convert the original data into a format suitable for frequency modulation. The encoding process may include data compression, error detection, and the addition of error correction codes to ensure the integrity and reliability of the data during transmission.

[0094] Next, the encoded data is modulated using the corrected frequency modulation signal. Frequency Modulation (FM) is a modulation technique in which the frequency of the carrier signal changes according to the change of the input signal. In the present invention, the standard FM signal is improved to meet the special requirements of the quantum laser communication link to improve the data transmission rate and anti-interference ability.

[0095] After the modulation process is completed, the modulated signal is sent through the quantum laser communication link. Quantum laser communication is a technology that uses laser beams in quantum states to transmit information. Compared with traditional optical communication, quantum laser communication has higher security because any attempt to eavesdrop on the transmitted signal will inevitably change the quantum state and thus be immediately detected.

[0096] At the receiving end, the quantum laser communication link demodulates the received modulated signal to recover the encoded data. Then, the device at the receiving end decodes the data using the same encoding rule as the transmitting end to finally obtain the original data to be transmitted.

[0097] As described above, by using the sensor component to monitor in real time the electromagnetic field intensity, temperature value, humidity value, wind speed, atmospheric turbulence intensity, and noise level of the environment where the quantum laser communication link is located, and being able to adjust the frequency modulation signal according to the real-time monitored data, the stability and anti-interference ability of the quantum laser communication are significantly improved, ensuring the accuracy and efficiency of data transmission. It can also effectively cope with the impact of complex environmental changes on quantum laser communication, extend the communication distance, and improve the communication quality.

[0098] In some embodiments of the present application, in combination with Figure 3 , such as Figure 4 shown, in the above S302, the method for judging whether the current electromagnetic field affects the quantum laser communication link according to the electromagnetic field intensity specifically includes:

[0099] S401. Compare the electromagnetic field intensity with a preset electromagnetic field intensity. If the electromagnetic field intensity is less than the preset electromagnetic field intensity, it is judged that the current electromagnetic field does not affect the quantum laser communication link; if the electromagnetic field intensity is greater than or equal to the preset electromagnetic field intensity, it is judged that the current electromagnetic field affects the quantum laser communication link.

[0100] Specifically, in order to ensure the stability and security of the quantum laser communication link, it is necessary to monitor and evaluate the external electromagnetic field that may affect the communication quality. The specific steps are as follows:

[0101] S1. Obtain the electromagnetic field intensity data in the current environment in real time through an electromagnetic field sensor or monitoring device.

[0102] S2. Set a preset electromagnetic field intensity threshold according to the anti-interference ability of the quantum laser communication link.

[0103] Among them, the preset electromagnetic field intensity threshold represents the maximum external electromagnetic interference intensity that the communication link can withstand. Exceeding this intensity may affect the communication quality.

[0104] S3. Compare and analyze the real-time monitored electromagnetic field intensity with the preset electromagnetic field intensity threshold.

[0105] Specifically, if the currently monitored electromagnetic field intensity is less than the preset electromagnetic field intensity threshold, it can be judged that the current electromagnetic field environment has no impact on the quantum laser communication link, and the communication link can work normally. If the currently monitored electromagnetic field intensity is greater than or equal to the preset electromagnetic field intensity threshold, it can be judged that the current electromagnetic field environment has an impact on the quantum laser communication link, and corresponding measures may need to be taken to reduce electromagnetic interference, such as: adjusting the position of the communication device, increasing shielding measures, or temporarily interrupting the communication, etc., to ensure the stability of the communication link and the security of data transmission.

[0106] Through the above steps, the impact of electromagnetic fields on quantum laser communication links can be effectively evaluated and managed, ensuring the reliable operation of the communication system.

[0107] In some embodiments of the present application, in combination with Figure 4 , such as Figure 5 shown, in the above S303, the method for determining the electromagnetic field impact coefficient of the quantum laser communication link according to the electromagnetic field strength and adjusting the initial modulation slope according to the electromagnetic field impact coefficient specifically includes:

[0108] S501. Determine the electromagnetic field impact coefficient of the quantum laser communication link according to the electromagnetic field strength. In some embodiments of the present application, the electromagnetic field impact coefficient is calculated according to the following formula:

[0109] k = d·e mE ;

[0110] where k represents the electromagnetic field impact coefficient, E represents the electromagnetic field strength, and d and m represent constants;

[0111] Specifically, in a quantum laser communication system, the electromagnetic field strength has a direct impact on the performance of the communication link. To ensure the stability and reliability of the communication link, it is necessary to quantify the impact of the electromagnetic field and adjust the communication parameters accordingly. First, the electromagnetic field strength E needs to be determined, which can be obtained through various electromagnetic measurement devices. Once the electromagnetic field strength is obtained, the electromagnetic field impact coefficient k can be calculated. Next, the calculated electromagnetic field impact coefficient k is compared with a preset impact coefficient.

[0112] S502. Modulate the initial modulation slope according to the electromagnetic field impact coefficient to obtain an adjusted modulation slope.

[0113] Specifically, the electromagnetic field impact coefficient is compared with a preset impact coefficient, where the preset impact coefficient is a threshold preset according to the system design criteria and performance requirements. If the electromagnetic field impact coefficient is less than the preset impact coefficient, the initial modulation slope is adjusted according to the following formula:

[0114] M = M0×(1 + ak);

[0115] where M represents the adjusted modulation slope, M0 represents the initial modulation slope, a represents a constant, and a < 1.

[0116] If the electromagnetic field impact coefficient is greater than or equal to the preset impact coefficient, the initial modulation slope is adjusted according to the following formula:

[0117] M = M0×bk;

[0118] where b represents a constant.

[0119] Specifically, if the electromagnetic field influence coefficient k is less than the preset influence coefficient, it indicates that the influence of the electromagnetic field intensity on the communication link is within an acceptable range. At this time, the initial modulation slope M0 can be fine-tuned. The adjustment formula is as follows: M = M0×(1 + ak); where M represents the adjusted modulation slope, M0 represents the initial modulation slope, and a is a constant less than 1, which is used to control the adjustment amplitude.

[0120] If the electromagnetic field influence coefficient k is greater than or equal to the preset influence coefficient, it indicates that the influence of the electromagnetic field intensity on the communication link is relatively large, and more significant adjustments are required. The adjustment formula at this time is: M = M0×bk; where b is a constant, which is also used to control the adjustment amplitude. However, different from a, the value of b will be set according to the actual situation to ensure that the adjusted modulation slope can effectively cope with the influence of the electromagnetic field.

[0121] Through the above steps, an adjusted modulation slope M can be obtained, which takes into account the influence of the electromagnetic field intensity, thereby optimizing the performance of the quantum laser communication link.

[0122] Exemplarily, assume that the initial modulation slope M0 = 2, the preset influence coefficient is 0.5, the electromagnetic field intensity E = 0.3, the electromagnetic field influence coefficient k = 0.3 (here it is given first only for the sake of complete representation of the calculation, but it is not used in the subsequent core calculation process), the constant a = 0.4, and b = 0.8.

[0123] Since the electromagnetic field influence coefficient k = 0.3 is less than the preset influence coefficient 0.5, the initial modulation slope is adjusted according to M = M0×(1 + ak).

[0124] Substituting the corresponding values, we get: M = 2×(1 + 0.4×0.3) = 2.24.

[0125] So the adjusted modulation slope is 2.24.

[0126] Similarly, the initial modulation slope M0 = 2, the preset influence coefficient is 0.5, the electromagnetic field intensity E = 0.8, the electromagnetic field influence coefficient k = 0.8. Since the electromagnetic field influence coefficient is greater than the preset influence coefficient, the initial modulation slope is adjusted according to M = M0×bk.

[0127] Substituting the corresponding values, we get: M = 2×0.8×0.8 = 1.28.

[0128] So the adjusted modulation slope is 1.28.

[0129] It is understandable that through this adaptive frequency modulation method, communication interference in different electromagnetic field environments can be effectively addressed, enhancing the stability and reliability of quantum laser communication. Specifically, when the electromagnetic field intensity is low, a small adjustment coefficient a is used to finely adjust the initial modulation slope to ensure the accuracy of the communication signal; while when the electromagnetic field intensity is high, a large adjustment coefficient b is utilized to significantly adjust the initial modulation slope to counteract the impact of the strong electromagnetic field on the communication link. In addition, this method also has strong flexibility and adaptability, and can dynamically adjust the modulation slope according to the changes in the electromagnetic field in the actual application scenario to further optimize the communication performance. The experimental results show that after adopting this adaptive frequency modulation method, the anti-interference ability of the quantum laser communication system is significantly enhanced, and the communication error rate is greatly reduced, laying a solid foundation for the practical application of quantum communication technology.

[0130] In some embodiments of the present application, in combination with Figure 5 , such as Figure 6 shown, in the above S303, the method of correcting the adjusted frequency modulation signal according to the environmental parameters and the noise level to obtain the corrected frequency modulation signal; or correcting the initial frequency modulation signal according to the environmental parameters and the noise level to obtain the corrected frequency modulation signal specifically includes:

[0131] S601. Determine the change amount of the frequency modulation signal according to the environmental parameters and the noise level.

[0132] In some embodiments of the present application, the change amount of the frequency modulation signal is determined according to the following formula:

[0133]

[0134] where x1 = T, x2 = H, x3 = V, x4 = I, T represents the temperature value, H represents the humidity value, V represents the wind speed, and I represents the atmospheric turbulence intensity; x 10 represents the standard temperature value, x 20 represents the standard humidity value, x 30 represents the standard wind speed, x 40 represents the standard atmospheric turbulence intensity;

[0135] a i represents the first-order coefficient of each parameter of the environmental parameters, b ij represents the second-order interaction coefficient between the environmental parameters, c1 represents the first-order coefficient of the noise level, d i represents the interaction coefficient between the noise and each environmental parameter, e1 represents the second-order coefficient of the noise level, N represents the noise level, and ∈ represents the random error term; where i = 1, 2, 3, 4; j = i + 1, i + 2,..., 4.

[0136] Specifically, in this embodiment, the possible second-order interaction terms between environmental parameters and the interaction terms between noise and each environmental parameter are considered. a i represents the first-order coefficient of each environmental parameter, indicating the linear influence of each environmental parameter on the frequency alone, and its value can be obtained by fitting the single-factor experimental data. For example, a1 represents the influence coefficient of temperature change on the frequency, and the unit may be Hz / ℃. b ij represents the second-order interaction coefficient between environmental parameters, reflecting the influence of the synergistic effect of two environmental factors on the frequency. c1 represents the first-order coefficient of the noise level, indicating the influence of noise on the frequency alone. d i represents the interaction coefficient between noise and each environmental parameter, reflecting the degree of change in the influence of noise on the frequency under different environmental parameters. e1 represents the second-order coefficient of the noise level. ∈ is the random error term, including the influence of other unconsidered minor factors and measurement errors on the frequency, and it is usually assumed to follow a normal distribution with a mean of zero and a variance of σ 2 of.

[0137] S602. Modify the modulated frequency modulation signal according to the change amount of the frequency modulation signal to obtain a modified frequency modulation signal.

[0138] Specifically, based on the change amount of the frequency modulation signal, the adjusted frequency modulation signal is modified to obtain a modified frequency modulation signal, and the modified frequency modulation signal is equal to the sum of the adjusted frequency modulation signal and the change amount of the frequency modulation signal.

[0139] As can be seen from the above, modifying the adjusted frequency modulation signal according to the environmental parameters and the noise level to obtain a modified frequency modulation signal includes: First, analyze environmental parameters such as temperature, humidity, wind speed, etc., and the noise level, which may affect the signal propagation and reception quality. Then, based on these environmental parameters and the noise level, calculate the change amount of the frequency modulation signal. This change amount reflects the adjustment that needs to be made to the adjusted frequency modulation signal or the initial frequency modulation signal to ensure signal quality under the current environment. Finally, add the calculated change amount of the frequency modulation signal to the modulated frequency modulation signal to obtain the modified frequency modulation signal. In this way, it can be ensured that the signal transmission remains stable and clear under different environmental conditions.

[0140] In some embodiments of the present application, in combination with Figure 5 , such as Figure 6 shown, in the above S304, the method of modifying the initial frequency modulation signal according to the environmental parameters and the noise level to obtain a modified frequency modulation signal specifically includes:

[0141] S603. If there is no influence, determine the change amount of the frequency modulation signal according to the environmental parameters and the noise level.

[0142] Specifically, if the current electromagnetic field strength affects the quantum laser communication link, the change amount of the frequency modulation signal is determined according to the environmental parameters and the noise level.

[0143] S604. Correct the initial frequency modulation signal according to the change amount of the frequency modulation signal to obtain a corrected frequency modulation signal.

[0144] Specifically, the initial frequency modulation signal is corrected based on the change amount of the frequency modulation signal to obtain a corrected frequency modulation signal, and the corrected frequency modulation signal is equal to the sum of the initial frequency modulation signal and the change amount of the frequency modulation signal.

[0145] As can be seen from the above, correcting the initial frequency modulation signal according to the environmental parameters and the noise level to obtain a corrected frequency modulation signal includes: calculating the change amount of the frequency modulation signal based on environmental parameters such as temperature, humidity, wind speed, and noise level, and finally adding the calculated change amount of the frequency modulation signal to the initial frequency modulation signal to obtain a corrected frequency modulation signal. In this way, the stability and accuracy of signal transmission can be ensured under different environmental conditions or noise levels.

[0146] The above embodiments obtain the transmission distance, electromagnetic field strength, environmental parameters, and noise level of the quantum laser communication link, significantly improving the stability and reliability of data transmission. Even under complex and changeable environmental conditions, efficient data transmission can be ensured. The initial modulation slope is determined by the transmission distance, and it is judged whether the current electromagnetic field affects the quantum laser communication link according to the electromagnetic field strength. If it has an impact, the adjustment frequency modulation signal or the initial frequency modulation signal is corrected, optimizing the anti-interference ability of the signal. Through precise frequency modulation, the influence of environmental noise on the communication quality is effectively reduced. The adaptability and flexibility of the quantum laser communication system are enhanced, and the frequency modulation strategy can be dynamically adjusted according to real-time environmental parameters to ensure the continuous stability of the communication link. The security of data transmission is improved. Utilizing the unique properties of quantum lasers, the confidentiality and anti-tampering ability of data during transmission are enhanced. The system design and operation process are simplified, enabling the quantum laser communication technology to be widely applied in more practical application scenarios and reducing the maintenance and operation costs.

[0147] The above mainly introduces the solution provided by the embodiments of the present application from the perspective of methods. To implement the above functions, it includes the corresponding hardware structures and / or software modules for executing each function. Those skilled in the art should easily realize that, in combination with the units and algorithm steps of each example described in the embodiments disclosed in this article, the present application can be implemented in the form of hardware or a combination of hardware and computer software. Whether a certain function is executed in the way of hardware or computer software driving hardware depends on the specific application and design constraints of the technical solution. Professional technicians can use different methods to implement the described functions for each specific application, but such implementation should not be considered to exceed the scope of the present application.

[0148] The embodiments of the present application can divide the functional modules of the adaptive frequency modulation device according to the above method examples. For example, each functional module can be divided corresponding to each function, or two or more functions can be integrated into one processing module. The above integrated module can be implemented in the form of hardware or in the form of a software functional module. Optionally, the division of modules in the embodiments of the present application is illustrative, only a logical function division, and there can be other division methods in actual implementation.

[0149] As Figure 7 shown, it is a schematic structural diagram of an adaptive frequency modulation device provided by the embodiments of the present application. Figure 7 The shown adaptive frequency modulation device includes: an acquisition unit 701 and a processing unit 702;

[0150] The acquisition unit 701 is used to acquire the transmission distance of the quantum laser communication link;

[0151] The processing unit 702 is used to determine the initial modulation slope according to the transmission distance;

[0152] The acquisition unit 701 is further used to acquire the electromagnetic field strength, environmental parameters and noise level of the quantum laser communication link, and the environmental parameters include at least one of temperature value, humidity value, wind speed and atmospheric turbulence intensity;

[0153] The processing unit 702 is further used to determine whether the current electromagnetic field affects the quantum laser communication link according to the electromagnetic field strength; if it has an impact, determine the electromagnetic field impact coefficient of the quantum laser communication link according to the electromagnetic field strength, and adjust the initial modulation slope according to the electromagnetic field impact coefficient to obtain an adjusted modulation slope, generate an adjusted frequency modulation signal based on the adjusted modulation slope, and correct the adjusted frequency modulation signal according to the environmental parameters and noise level to obtain a corrected frequency modulation signal; if there is no impact, correct the initial frequency modulation signal according to the environmental parameters and noise level to obtain a corrected frequency modulation signal; wherein, the initial frequency modulation signal is generated according to the initial modulation slope;

[0154] The processing unit 702 is further configured to perform data encoding on the data to be transmitted based on the corrected frequency modulation signal and transmit it through the quantum laser communication link.

[0155] Optionally, the processing unit 702 is specifically configured to:

[0156] Determine an initial modulation slope according to the relationship between the transmission distance and the first preset transmission distance and the relationship between the transmission distance and the second preset transmission distance; the first preset transmission distance is less than the second preset transmission distance; if the transmission distance is less than the first preset transmission distance, determine that the initial modulation slope is the first preset initial modulation slope; if the transmission distance is greater than or equal to the first preset transmission distance and less than the second preset transmission distance, determine that the initial modulation slope is the second preset initial modulation slope; if the transmission distance is greater than or equal to the second preset transmission distance, determine that the initial modulation slope is the third preset initial modulation slope; wherein, the first preset initial modulation slope is greater than the second preset initial modulation slope, and the second preset initial modulation slope is greater than the third preset initial modulation slope.

[0157] Optionally, the electromagnetic field strength, environmental parameters, and noise level are collected by the sensor assembly; the sensor assembly includes:

[0158] An electromagnetic field strength sensor for detecting the electromagnetic field strength of the environment where the quantum laser communication link is located; a temperature sensor for detecting the temperature value of the environment where the quantum laser communication link is located; a humidity sensor for detecting the humidity value of the environment where the quantum laser communication link is located; a wind speed sensor for detecting the wind speed of the environment where the quantum laser communication link is located; a scintillometer for detecting the atmospheric turbulence intensity of the environment where the quantum laser communication link is located; a photodetector for detecting the noise power spectral density of the quantum laser communication link.

[0159] Optionally, the processing unit 702 is specifically configured to:

[0160] The noise level is determined according to the noise power spectral density; the noise level is determined according to the following formula:

[0161] N = ∫S(f)df;

[0162] wherein, N represents the noise level, and S(f) represents the noise power spectral density.

[0163] Optionally, the processing unit 702 is specifically configured to:

[0164] Compare the electromagnetic field strength with the preset electromagnetic field strength. If the electromagnetic field strength is less than the preset electromagnetic field strength, it is determined that the current electromagnetic field has no impact on the quantum laser communication link; if the electromagnetic field strength is greater than or equal to the preset electromagnetic field strength, it is determined that the current electromagnetic field has an impact on the quantum laser communication link.

[0165] Optionally, the processing unit 702 is specifically configured to:

[0166] The electromagnetic field influence coefficient is calculated according to the following formula:

[0167] k = d·e mE ;

[0168] where k represents the electromagnetic field influence coefficient, E represents the electromagnetic field strength, and d and m represent constants;

[0169] Compare the electromagnetic field influence coefficient with a preset influence coefficient. If the electromagnetic field influence coefficient is less than the preset influence coefficient, adjust the initial modulation slope according to the electromagnetic field influence coefficient to obtain an adjusted modulation slope; the adjusted modulation slope is determined according to the following formula:

[0170] M = M0×(1 + ak);

[0171] where M represents the adjusted modulation slope, M0 represents the initial modulation slope, a represents a constant, and a < 1;

[0172] If the electromagnetic field influence coefficient is greater than or equal to the preset influence coefficient, the adjusted modulation slope is determined according to the following formula:

[0173] M = M0×bk;

[0174] where b represents a constant.

[0175] Optionally, before correcting the adjusted frequency modulation signal according to the environmental parameters and the noise level, or before correcting the initial frequency modulation signal according to the environmental parameters and the noise level, the processing unit 702 is specifically configured to:

[0176] Determine the frequency modulation signal variation according to the environmental parameters and the noise level; the frequency modulation signal variation is determined according to the following formula:

[0177]

[0178] where x1 = T, x2 = H, x3 = V, x4 = I, T represents the temperature value, H represents the humidity value, V represents the wind speed, and I represents the atmospheric turbulence intensity; x 10 represents the standard temperature value, x 20 represents the standard humidity value, x 30 represents the standard wind speed, x 40 represents the standard atmospheric turbulence intensity;

[0179] a i represents the first-order coefficient of each parameter of the environmental parameters, b ij represents the second-order interaction coefficient between the environmental parameters, c1 represents the first-order coefficient of the noise level, d irepresents the interaction coefficient between noise and each environmental parameter, e1 represents the second-order coefficient of the noise level, N represents the noise level, and ∈ represents the random error term; where i = 1, 2, 3, 4; j = i + 1, i + 2,..., 4.

[0180] Optionally, the processing unit 702 is specifically configured to:

[0181] Based on the change amount of the frequency modulation signal, correct the adjusted frequency modulation signal to obtain a corrected frequency modulation signal, where the corrected frequency modulation signal is equal to the sum of the adjusted frequency modulation signal and the change amount of the frequency modulation signal.

[0182] Optionally, the processing unit 702 is specifically configured to:

[0183] Based on the change amount of the frequency modulation signal, correct the initial frequency modulation signal to obtain a corrected frequency modulation signal, where the corrected frequency modulation signal is equal to the sum of the initial frequency modulation signal and the change amount of the frequency modulation signal.

[0184] Optionally, the processing unit 702 is specifically configured to:

[0185] Encode the data to be transmitted according to a preset coding rule, modulate the encoded data to be transmitted based on the corrected frequency modulation signal, and send the modulated data to be transmitted to the receiving end through a quantum laser communication link.

[0186] The embodiment of the present application further provides a computer-readable storage medium, where the computer-readable storage medium includes computer-executable instructions. When the computer-executable instructions run on a computer, the computer is enabled to execute the adaptive frequency modulation method provided in the above embodiment.

[0187] The embodiments of the present application also provide a computer program product, which can be directly loaded into a memory and contains software code. After being loaded and executed by a computer, the computer program product can implement the adaptive frequency modulation method provided in the above embodiments. Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention and not to limit them. Although the present invention has been described in detail with reference to the preferred embodiments, those of ordinary skill in the art should understand that they can still modify or equivalently replace the technical solutions of the present invention, and these modifications or equivalent replacements do not make the modified technical solutions deviate from the spirit and scope of the technical solutions of the present invention. For the system provided in the above embodiments, only the division of the above function modules is used for illustration. In actual applications, the above functions can be allocated to different function modules according to needs, that is, the modules or steps in the embodiments of the present invention can be decomposed or combined again. For example, the modules in the above embodiments can be combined into one module, or further split into multiple sub-modules to complete all or part of the functions described above. For the names of the modules and steps involved in the embodiments of the present invention, they are only used to distinguish each module or step and are not regarded as an improper limitation of the present invention.

[0188] Those skilled in the art should be able to realize that the modules and method steps of each example described in combination with the embodiments disclosed herein can be implemented by electronic hardware, computer software, or a combination of the two. The programs corresponding to the software modules and method steps can be placed in a random access memory (RAM), internal memory, read-only memory (ROM), electrically erasable programmable ROM, register, hard disk, removable disk, CD-ROM, or any other form of storage medium known in the technical field. To clearly illustrate the interchangeability of electronic hardware and software, the composition and steps of each example have been generally described according to functions in the above description. Whether these functions are executed in the form of electronic 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 to exceed the scope of the present invention.

[0189] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention and not to limit them. Although the present invention has been described in detail with reference to the preferred embodiments, those of ordinary skill in the art should understand that they can still modify or equivalently replace the technical solutions of the present invention, and any modification or equivalent replacement that does not depart from the spirit and scope of the present invention should be covered within the protection scope of the claims of the present invention.

Claims

1. An adaptive frequency modulation method in quantum laser communication, characterized in that, Including: Obtain the transmission distance of the quantum laser communication link, and determine an initial modulation slope according to the transmission distance; Obtain the electromagnetic field strength, environmental parameters, and noise level of the quantum laser communication link, where the environmental parameters include at least one of a temperature value, a humidity value, a wind speed, and an atmospheric turbulence intensity; Judge whether the current electromagnetic field affects the quantum laser communication link according to the electromagnetic field strength; If it has an impact, determine an electromagnetic field impact coefficient of the quantum laser communication link according to the electromagnetic field strength, adjust the initial modulation slope according to the electromagnetic field impact coefficient to obtain an adjusted modulation slope, generate an adjusted frequency modulation signal based on the adjusted modulation slope, and correct the adjusted frequency modulation signal according to the environmental parameters and the noise level to obtain a corrected frequency modulation signal; If it has no impact, correct the initial frequency modulation signal according to the environmental parameters and the noise level to obtain the corrected frequency modulation signal; where the initial frequency modulation signal is generated according to the initial modulation slope; Perform data encoding on the data to be transmitted based on the corrected frequency modulation signal, and transmit it through the quantum laser communication link.

2. The adaptive frequency modulation method in quantum laser communication according to claim 1, wherein The determining the initial modulation slope according to the transmission distance includes: Determine the initial modulation slope according to the relationship between the transmission distance and a first preset transmission distance, and the relationship between the transmission distance and a second preset transmission distance; the first preset transmission distance is less than the second preset transmission distance; If the transmission distance is less than the first preset transmission distance, determine the initial modulation slope as a first preset initial modulation slope; If the transmission distance is greater than or equal to the first preset transmission distance and less than the second preset transmission distance, determine the initial modulation slope as a second preset initial modulation slope; If the transmission distance is greater than or equal to the second preset transmission distance, determine the initial modulation slope as a third preset initial modulation slope; where the first preset initial modulation slope is greater than the second preset initial modulation slope, and the second preset initial modulation slope is greater than the third preset initial modulation slope.

3. The adaptive frequency modulation method in quantum laser communication according to claim 1, characterized in that The electromagnetic field strength, the environmental parameters, and the noise level are collected by a sensor assembly; The sensor assembly includes: an electromagnetic field strength sensor for detecting the electromagnetic field strength of the environment where the quantum laser communication link is located; A temperature sensor for detecting the temperature value of the environment where the quantum laser communication link is located; A humidity sensor for detecting the humidity value of the environment where the quantum laser communication link is located; A wind speed sensor for detecting the wind speed of the environment where the quantum laser communication link is located; A scintillometer for detecting the atmospheric turbulence intensity of the environment where the quantum laser communication link is located; A photodetector for detecting the noise power spectral density of the quantum laser communication link.

4. The adaptive frequency modulation method in quantum laser communication according to claim 1, wherein The noise level is determined according to the noise power spectral density; The noise level is determined according to the following formula: N = ∫S(f)df; where N represents the noise level and S(f) represents the noise power spectral density.

5. The adaptive frequency modulation method in quantum laser communication according to claim 1, wherein, Judging whether the current electromagnetic field affects the quantum laser communication link according to the electromagnetic field intensity includes: Comparing the electromagnetic field intensity with a preset electromagnetic field intensity. If the electromagnetic field intensity is less than the preset electromagnetic field intensity, it is judged that the current electromagnetic field does not affect the quantum laser communication link; If the electromagnetic field intensity is greater than or equal to the preset electromagnetic field intensity, it is judged that the current electromagnetic field affects the quantum laser communication link.

6. The adaptive frequency modulation method in quantum laser communication according to claim 1, characterized in that Determining the electromagnetic field influence coefficient of the quantum laser communication link according to the electromagnetic field intensity, and adjusting the initial modulation slope according to the electromagnetic field influence coefficient to obtain an adjusted modulation slope, including: The electromagnetic field influence coefficient is calculated according to the following formula: k = d·e mE ; where k represents the electromagnetic field influence coefficient, E represents the electromagnetic field intensity, and d and m represent constants; Comparing the electromagnetic field influence coefficient with a preset influence coefficient. If the electromagnetic field influence coefficient is less than the preset influence coefficient, adjusting the initial modulation slope according to the electromagnetic field influence coefficient to obtain the adjusted modulation slope; The adjusted modulation slope is determined according to the following formula: M = M0×(1 + ak); where M represents the adjusted modulation slope, M0 represents the initial modulation slope, a represents a constant, and a < 1; If the electromagnetic field influence coefficient is greater than or equal to the preset influence coefficient, the adjusted modulation slope is determined according to the following formula: M = M0×bk; where b represents a constant.

7. The adaptive frequency modulation method in quantum laser communication according to claim 1, wherein Before correcting the adjusted frequency modulation signal according to the environmental parameters and noise level, or before correcting the initial frequency modulation signal according to the environmental parameters and noise level, it further includes: Determining the frequency modulation signal variation according to the environmental parameters and noise level; The frequency modulation signal variation is determined according to the following formula: where x1 = T, x2 = H, x3 = V, x4 = I, T represents the temperature value, H represents the humidity value, V represents the wind speed, and I represents the atmospheric turbulence intensity; x 10 represents the standard temperature value, x 20 represents the standard humidity value, x 30 represents the standard wind speed, x 40 represents the standard atmospheric turbulence intensity; a i represents the first-order coefficient of each of the environmental parameters, b ij represents the second-order interaction coefficient between the environmental parameters, c1 represents the first-order coefficient of the noise level, d i represents the interaction coefficient between the noise and each of the environmental parameters, e1 represents the second-order coefficient of the noise level, N represents the noise level, ∈ represents the random error term; where i = 1, 2, 3, 4; j = i + 1, i + 2,..., 4.

8. The adaptive frequency modulation method in quantum laser communication according to claim 7, characterized in that, Correcting the adjusted frequency modulation signal according to the environmental parameters and the noise level to obtain a corrected frequency modulation signal, including: Correcting the adjusted frequency modulation signal based on the frequency modulation signal variation to obtain the corrected frequency modulation signal, and the corrected frequency modulation signal is equal to the sum of the adjusted frequency modulation signal and the frequency modulation signal variation.

9. The adaptive frequency modulation method in quantum laser communication according to claim 7, wherein Correcting the initial frequency modulation signal according to the environmental parameters and the noise level to obtain the corrected frequency modulation signal, including: Correcting the initial frequency modulation signal based on the frequency modulation signal variation to obtain the corrected frequency modulation signal, and the corrected frequency modulation signal is equal to the sum of the initial frequency modulation signal and the frequency modulation signal variation.

10. The adaptive frequency modulation method in quantum laser communication according to claim 1, wherein Encoding the data to be transmitted based on the corrected frequency modulation signal and transmitting it through the quantum laser communication link, including: Encoding the data to be transmitted according to a preset encoding rule, modulating the encoded data to be transmitted based on the corrected frequency modulation signal, and sending the modulated data to be transmitted through the quantum laser communication link to a receiving end.

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