Relay system and method for air-water cross-medium communication

Abstract

This application relates to a relay system and method for air-to-water cross-medium communication, comprising: a transmission module for transmitting target baseband signal light and target beacon light through a target air node to establish an initial communication link between the air node and a surface relay node; a wavelength conversion device for generating frequency-doubled light of the baseband signal light based on the baseband signal light and a frequency-doubled strategy; and an adaptive communication control module for acquiring the location information of the underwater target node to analyze the communication quality of the initial communication link, determine the modulation mode of the target signal light, and adjust the power of the second and third frequency-doubled light according to the target communication node information to optimize the communication performance with the target communication node, and establish a bidirectional communication link between the target air node and the underwater target node to transmit target communication data. This solves the problems of existing blue-green light-based air-to-water cross-medium communication methods, such as easy exposure of target location and inability to simultaneously meet the requirements of high bandwidth and high power transmission.

Description

Technical Field

[0001] This application relates to the fields of cross-medium communication and wireless optical communication, and in particular to a relay system and method for air-water cross-medium communication. Background Technology

[0002] In the field of optical communication, underwater optical communication and air-to-water cross-medium communication are currently hot research topics. Air-to-water cross-medium networking communication, in particular, has attracted considerable attention due to its flexible transmission and reception mechanism and wide coverage. This communication method is key to realizing network communication between underwater targets and airborne platforms, and has significant strategic importance for building an integrated land-sea-air communication system. Currently, air-to-water cross-medium communication uses the method of directly transmitting blue-green laser light through the atmosphere to underwater surfaces; however, this method still faces the following problems:

[0003] First, transmitting blue-green light directly through the atmosphere easily exposes the target's location, resulting in poor confidentiality;

[0004] Second, due to limitations in the devices, the emission of blue and green light cannot simultaneously meet the requirements of high bandwidth and high power.

[0005] Third, the output of traditional blue-green lasers is continuous light. In some channel environments with low signal-to-noise ratios, continuous light modulation has low performance. Pulse transmission is used to improve signal transmission by increasing the peak power of the signal.

[0006] In summary, existing air-to-water cross-medium communication methods based on blue-green light are prone to revealing the target location and cannot simultaneously meet the requirements of high bandwidth and high power transmission, which urgently need to be addressed. Summary of the Invention

[0007] This application provides a relay system and method for air-water cross-medium communication to solve the problems that existing air-water cross-medium communication methods based on blue-green light are prone to exposing the target location and cannot simultaneously meet the requirements of high bandwidth and high power transmission.

[0008] The first aspect of this application provides a relay system for air-to-water cross-medium communication, comprising: a transmission module, configured to transmit a target baseband signal light and a target beacon light through a target air node, and to construct an initial communication link between the air node and a surface relay node based on the target baseband signal light, the target beacon light, and a preset scanning mode, wherein the target baseband signal light is near-infrared light; a wavelength conversion device, configured to generate a frequency-doubled light corresponding to the baseband signal light based on the baseband signal light and a preset frequency-doubled strategy, so as to use the frequency-doubled light to perform link communication in a preset surface-to-underwater communication link; and an adaptive communication control module, configured to acquire the position information of the underwater target node, analyze the communication quality of the initial communication link through the position information, obtain analysis results, determine the modulation mode of the target signal light based on the analysis results, and establish a bidirectional communication link between the target air node and the underwater target node, so as to use the bidirectional communication link to transmit target communication data.

[0009] Optionally, in one embodiment of this application, the transmission module includes: an optical transceiver antenna for determining a target scanning mode to scan the target beacon light using the target scanning mode; and an air-to-water node communication unit for controlling the optical transceiver antenna to track the target beacon light according to the target scanning mode based on the water surface relay node, to detect the intensity of the target beacon light in real time, obtain an intensity detection result, obtain the initial position of the target air node through the intensity detection result, and determine the final position of the target air node based on the target scanning mode and the initial position, so as to establish the initial communication link based on the final position.

[0010] Optionally, in one embodiment of this application, it further includes: an optical fiber coupling unit; a deformable mirror for introducing the target fundamental frequency signal light into the optical fiber coupling unit through the initial communication link; a beam splitter for splitting the target fundamental frequency signal light in the optical fiber coupling unit to generate a split signal; a photodetector for detecting the light intensity signal of the split signal; and a main control unit for generating a driver control signal based on the light intensity signal to control the deformable mirror to perform low-order correction on the target fundamental frequency signal light through the driver control signal.

[0011] Optionally, in one embodiment of this application, it further includes: a pulsed laser, used to switch the target signal light modulation mode to pulsed light modulation mode when the link distance and the link signal-to-noise ratio meet a first preset link condition; and a continuous light laser, used to switch the target signal light modulation mode to continuous light modulation mode when the link distance and the link signal-to-noise ratio meet a second preset link condition.

[0012] Optionally, in one embodiment of this application, the adaptive communication control module includes: a position determination unit, configured to transmit the target beacon light to the target communication node through the surface relay node, so that the target communication node and the surface relay node track each other to obtain position information, and establish a surface-to-underwater communication link between the surface relay node and the target communication node based on the position information; and a data analysis unit, configured to calculate the link distance of the surface-to-underwater communication link between the surface relay node and the target communication node based on the position information through the surface relay node, and simultaneously analyze the target base of the target air node using the surface relay node. The system generates a control signal based on the link distance and the link signal-to-noise ratio, combined with a first preset link condition and a second preset link condition. A modulation / demodulation unit sends the control signal to the target air node, causing the target air node to switch the target signal light modulation mode. It adjusts the splitting ratio of the frequency-doubled light and the power allocation strategy of the splitter according to the target communication node of the target air node to optimize communication performance with the target communication node. It also demodulates the target communication data to the underwater target node through the surface relay node and sends the demodulated target communication data to the target air node through the bidirectional communication link.

[0013] A second aspect of this application provides a relay method for air-to-water cross-medium communication, comprising the following steps: transmitting a target baseband signal light and a target beacon light through a target air node, and constructing an initial communication link between the air node and a surface relay node based on the target baseband signal light, the target beacon light, and a preset scanning mode, wherein the target baseband signal light is near-infrared light; generating a frequency-doubled light corresponding to the baseband signal light based on the baseband signal light and a preset frequency-doubled strategy, and using the frequency-doubled light to perform link communication in a preset surface-to-underwater communication link; obtaining the location information of the underwater target node by transmitting the target beacon light through the surface relay node, analyzing the communication quality of the initial communication link through the location information, obtaining analysis results, determining the target signal light modulation mode based on the analysis results, and establishing a bidirectional communication link between the target air node and the underwater target node, and using the bidirectional communication link to transmit target communication data.

[0014] Optionally, in one embodiment of this application, the step of transmitting target baseband signal light and target beacon light through the target air node, and constructing an initial communication link between the air node and the surface relay node based on the target baseband signal light, the target beacon light, and a preset scanning mode, includes: controlling a preset optical transceiver antenna through the surface relay node to track the target beacon light according to the target scanning mode, so as to detect the intensity of the target beacon light in real time and obtain an intensity detection result; obtaining the initial position of the target air node through the intensity detection result, and determining the final position of the target air node based on the target scanning mode and the initial position, so as to establish the initial communication link based on the final position.

[0015] A third aspect of this application provides an electronic device, including: a memory, a processor, and a computer program stored in the memory and executable on the processor, wherein the processor executes the program to implement the relay method for air-water cross-medium communication as described in the above embodiments.

[0016] A fourth aspect of this application provides a computer-readable storage medium storing a computer program that, when executed by a processor, implements the above-described method for relaying air-water cross-media communication.

[0017] A fifth aspect of this application provides a computer program product, including a computer program that is executed to implement the above-described relay method for air-water cross-medium communication.

[0018] Therefore, the embodiments of this application have the following beneficial effects:

[0019] The embodiments of this application include a transmission module for transmitting target baseband signal light and target beacon light from a target air node, and constructing an initial communication link between the air node and the surface relay node based on the target baseband signal light, the target beacon light, and a preset scanning mode. The target baseband signal light is near-infrared light. A wavelength conversion device generates a frequency-doubled light corresponding to the baseband signal light based on the baseband signal light and a preset frequency-doubled strategy, enabling link communication via a preset surface-to-underwater communication link. An adaptive communication control module acquires the location information of the underwater target node, analyzes the communication quality of the initial communication link using the location information, obtains the analysis results, determines the modulation method of the target signal light based on the analysis results, and establishes a bidirectional communication link between the target air node and the underwater target node to transmit target communication data. This application optimizes communication performance with underwater or other relay nodes by using near-infrared lasers for air-to-water communication, effectively improving the stealth of communication. This solves the problems of existing blue-green light-based air-to-water cross-medium communication methods, which easily expose the target location and cannot simultaneously meet the requirements of high bandwidth and high power transmission.

[0020] Additional aspects and advantages of this application will be set forth in part in the description which follows, and in part will be obvious from the description, or may be learned by practice of this application. Attached Figure Description

[0021] The above and / or additional aspects and advantages of this application will become apparent and readily understood from the following description of the embodiments taken in conjunction with the accompanying drawings, wherein:

[0022] Figure 1 This is an example diagram of a relay system for air-water cross-medium communication according to an embodiment of this application;

[0023] Figure 2 A schematic diagram of the structure of a relay system for air-water cross-medium communication provided in one embodiment of this application;

[0024] Figure 3 A schematic diagram of the execution logic of a relay system for air-water cross-medium communication provided in one embodiment of this application;

[0025] Figure 4 A schematic diagram of adaptive communication control is provided for one embodiment of this application;

[0026] Figure 5 This is a flowchart of a relay method for air-water cross-medium communication according to an embodiment of this application;

[0027] Figure 6 This is a schematic diagram of the structure of an electronic device provided in an embodiment of this application.

[0028] Among them, 20 is a relay system for air-water cross-medium communication; 100 is an air node, 200 is a surface relay node, 300 is an underwater node, 400 is other surface relay nodes, 110 is a pulsed laser, 120 is a continuous laser, 130 is a control unit, 140 is a modulation and demodulation unit, 150 is an optical transceiver antenna corresponding to the air node, 201 is a transmission module, 202 is a wavelength conversion device, 203 is an adaptive communication control module, 210 is an optical transceiver antenna corresponding to the surface relay node, 220 is a deformable mirror, 230 is an optical fiber coupling module (i.e., an optical fiber coupling unit), 240 is a beam splitter, 250 is a photodetector, 260 is a main control unit; 601 is a memory, 602 is a processor, and 603 is a communication interface. Detailed Implementation

[0029] The embodiments of this application are described in detail below. Examples of these embodiments are shown in the accompanying drawings, wherein the same or similar reference numerals denote the same or similar elements or elements having the same or similar functions throughout. The embodiments described below with reference to the accompanying drawings are exemplary and intended to explain this application, and should not be construed as limiting this application.

[0030] The following describes a relay system and method for air-to-water cross-medium communication according to embodiments of this application, with reference to the accompanying drawings. Addressing the problems mentioned in the background section, this application provides a relay system for air-to-water cross-medium communication. In this system, a transmission module is used to transmit a target baseband signal light and a target beacon light through a target air node, and to construct an initial communication link between the air node and the surface relay node based on the target baseband signal light, the target beacon light, and a preset scanning mode. The target baseband signal light is near-infrared light. A wavelength conversion device is used to generate a frequency-doubled light corresponding to the baseband signal light based on the baseband signal light and a preset frequency-doubled strategy, so as to utilize the frequency-doubled light for link communication in a preset surface-to-underwater communication link. An adaptive communication control module is used to acquire the location information of the underwater target node, analyze the communication quality of the initial communication link based on the location information, obtain analysis results, determine the modulation mode of the target signal light based on the analysis results, and establish a bidirectional communication link between the target air node and the underwater target node to transmit target communication data using the bidirectional communication link. This application utilizes near-infrared lasers for air-to-water communication, thereby optimizing communication performance with underwater or other relay nodes and effectively improving communication concealment. This solves the problems of existing blue-green light-based air-to-water cross-medium communication methods, which easily expose target locations and cannot simultaneously meet the requirements of high bandwidth and high power transmission.

[0031] Specifically, Figure 1 This is a block diagram of a relay system for air-water cross-medium communication according to an embodiment of this application.

[0032] like Figure 1As shown, the relay system 20 for air-water cross-medium communication includes: a transmission module 201, a wavelength conversion device 202, and an adaptive communication control module 203.

[0033] The transmission module 201 is used to transmit target baseband signal light and target beacon light through the target air node 100, and to construct an initial communication link between the air node 100 and the water surface relay node 200 based on the target baseband signal light, the target beacon light and a preset scanning mode. The target baseband signal light is near-infrared light.

[0034] In the embodiments of this application, the air node 100 first transmits baseband signal light and beacon light, and the surface relay node 200 scans according to a preset scanning mode to cover a large field of view. The air node 100 and the surface relay node 200 capture and track the beacon light of both parties, thereby establishing a stable initial communication link.

[0035] Optionally, in one embodiment of this application, the transmission module 201 includes: an optical transceiver antenna and an air-water node communication unit.

[0036] Among them, the optical transceiver antenna is used to determine the target scanning mode so as to scan the target beacon light through the target scanning mode.

[0037] The air-to-water node communication unit is used to control the optical transceiver antenna 210 to track the target beacon light according to the target scanning method based on the water surface relay node 200, so as to detect the intensity of the target beacon light in real time, obtain the intensity detection result, obtain the initial position of the target air node 100 through the intensity detection result, and determine the final position of the target air node 100 based on the target scanning method and the initial position, so as to establish an initial communication link based on the final position.

[0038] In actual implementation, the embodiments of this application can initialize the air node 100, transmit 1064nm baseband signal light and beacon light from a point in the atmosphere through the air node 100, and receive the baseband signal light and beacon light from the water surface relay node 200 through the control unit 130.

[0039] The surface relay node 200 can receive optical signals with a large field of view through the corresponding optical transceiver antenna 210, and can scan according to a preset scanning mode through the air-water node communication unit. During the scanning process, the internal photodetector 250 detects the intensity of the received beacon light in real time. When a beacon light with a significantly increased intensity is detected, the pointing angle and position of the tracking device are recorded. This position is the initial position of the surface relay node 200 capturing the air node 100. Subsequently, the surface relay node 200 further refines the scanning range, narrows the scanning area, and increases the scanning accuracy to more accurately capture the light source position of the air node 100 and establish a stable initial communication link between the air node 100 and the surface relay node 200.

[0040] Wavelength conversion device 202 is used to generate frequency-doubled light corresponding to the fundamental frequency signal light based on the fundamental frequency signal light and a preset frequency doubling strategy, so as to use the frequency-doubled light to carry out link communication in a preset surface-to-underwater communication link.

[0041] Furthermore, in the embodiments of this application, the fundamental frequency signal light can be coupled into the receiving optical fiber through the deformable mirror 220 via the vertical link from the atmosphere to the water surface using the wavelength conversion device 202. Part of the light enters the photodetector 250, and the driver control signal of the deformable mirror 220 is generated by the detected light intensity signal to perform low-order correction on the signal light. The coupling efficiency is improved by reducing tilt aberration. The remaining signal light is frequency-doubled by the wavelength conversion device 202 to communicate with the underwater node 300 or frequency-tripled to establish communication with other nearby water surface nodes. The adaptive communication control module 203 autonomously realizes the switching of the signal light modulation mode or adjusts the output power of the second and third frequency multiplication of the wavelength conversion device 202.

[0042] Therefore, the embodiments of this application can output high-power and high-speed modulated near-infrared fundamental frequency light in a continuous light mode and input it to the wavelength conversion device 202 at the surface relay node 200 to generate high-power and high-speed modulated blue-green laser for communication with the underwater node 300. This solves the problem that traditional methods cannot simultaneously meet the high-power and high-bandwidth communication requirements when using blue-green laser to directly transmit underwater.

[0043] Optionally, in one embodiment of this application, the relay system 20 for air-water cross-medium communication in this application further includes: a deformable mirror 220, an optical fiber coupling unit 230, a beam splitter 240, a photodetector 250, and a main control unit 260.

[0044] Among them, the optical fiber coupling unit 230.

[0045] Deformable mirror 220 is used to introduce the target baseband signal light into the fiber optic coupling unit 230 through the initial communication link.

[0046] The beam splitter 240 is used to split the target fundamental frequency signal light in the fiber optic coupling unit 230 to generate a split signal.

[0047] Photodetector 250 is used to detect the light intensity signal of the split signal.

[0048] The main control unit 260 is used to generate a driver control signal based on the light intensity signal, so as to control the deformable mirror 220 to perform low-order correction on the target fundamental frequency signal light through the driver control signal.

[0049] It should be noted that, in the embodiments of this application, wavelength conversion is jointly performed by structural units such as wavelength conversion device 202, deformable mirror 220, fiber optic coupling unit 230, beam splitter 240, photodetector 250 and main control unit 260.

[0050] In the embodiments of this application, the communication process mainly includes a downlink from the air node 100 to the underwater node 300 and an uplink from the underwater node 300 to the air node 100. The downlink transmits high-power, high-speed modulated near-infrared signal light through the air node 100 for data transmission and transmits beacon light for positioning and calibration.

[0051] Air node 100 and surface relay node 200 capture and track the beacon light of each other to establish a stable communication link. The baseband signal light passes through the vertical link from the atmosphere to the water surface and is coupled to the fiber optic coupling unit through the deformable mirror 220. Part of the light enters the photodetector 250. The main control unit 260 generates the driver control signal of the deformable mirror 220 according to the detected light intensity signal to perform low-order correction on the baseband signal light to reduce tilt aberration and improve coupling efficiency to obtain frequency-doubled light. In this embodiment, the air node 100 uses near-infrared light, which is insensitive to the human eye, to directly hit the surface relay node 200 to generate blue-green light (i.e., frequency-doubled light) for underwater communication, which has high confidentiality and security.

[0052] In actual implementation, after the near-infrared signal light is coupled into the optical fiber, the embodiments of this application can generate blue-green laser by second frequency doubling of the wavelength conversion device 202 to communicate with the underwater node 300 in a scanning manner, or generate ultraviolet laser by third frequency doubling to communicate with the other nearby surface relay nodes 400 in a broadcast manner.

[0053] Understandably, traditional cross-medium communication methods use blue-green lasers to transmit directly in the atmosphere, which is easily detected by the human eye and exposes the communication target, resulting in poor confidentiality. However, the embodiments of this application use passive wavelength conversion as a relay means, and achieve the optical domain conversion of near-infrared signal light from the atmosphere to underwater by using passive frequency doubling. In addition, since the human eye is not sensitive to near-infrared light, the embodiments of this application use near-infrared light to directly hit the water surface relay node 200 to generate blue-green light for underwater communication, which has higher concealment and security than directly using blue-green laser transmission, and solves the problem that direct blue-green laser transmission easily exposes the communication target.

[0054] The adaptive communication control module 203 is used to acquire the position information of the underwater target node 300, analyze the communication quality of the initial communication link through the position information, obtain the analysis results, determine the target signal optical modulation mode based on the analysis results, and establish a two-way communication link between the target air node 100 and the underwater target node 300 to transmit target communication data using the two-way communication link.

[0055] It should be noted that before officially transmitting communication data, the air node 100 can inform the surface relay node 200 of the target node information for which it wants to establish a link.

[0056] In this embodiment, the surface relay node 200, equipped with an adaptive communication control module 203, receives target node information. The relay node 200 transmits beacon light underwater. The underwater node 300 (i.e., the underwater target node 300) refers to the tracking process of the surface relay node 200 described above, obtains the position information of the surface relay node, and establishes a communication link. The surface relay node 200 calculates the link distance with the underwater node 300 through the established communication link. At the same time, the surface relay node 200 obtains the signal-to-noise ratio of the link by analyzing the signal light received from the air node 100.

[0057] When the link distance is long or the signal-to-noise ratio is low, control information is sent to the air node 100 to switch the pulsed light modulation mode, thereby improving communication reliability and anti-interference capability. When the link distance is short and the signal-to-noise ratio is high, control information is sent to the air node 100 to switch the continuous light modulation mode, thereby achieving high-speed data transmission. In scenarios where a communication link needs to be established with the underwater node 300, the adjustable beam splitter of the control wavelength conversion device 202 is used to increase the transmittance of the second-harmonic light, thereby increasing the output power of the second-harmonic light and decreasing the output power of the third-harmonic light. In scenarios where a communication link needs to be established with other relay nodes 400, the adjustable beam splitter 240 of the control wavelength conversion device 202 is used to increase the reflectivity of the second-harmonic light, thereby decreasing the output power of the second-harmonic light and increasing the output power of the third-harmonic light.

[0058] Therefore, the embodiments of this application can adjust the output power according to real-time communication needs to ensure optimal channel capacity and communication link performance.

[0059] Optionally, in one embodiment of this application, the adaptive communication control module 203 includes: a position determination unit, a data analysis unit, and a modulation and demodulation unit 140.

[0060] The location determination unit is used to send the target beacon light to the target communication node through the surface relay node, so that the target communication node and the surface relay node can track each other to obtain location information, and establish a surface-underwater communication link between the surface relay node and the target communication node based on the location information.

[0061] The data analysis unit is used to calculate the link distance of the surface-to-underwater communication link between the surface relay node and the target communication node based on the location information of the surface relay node. At the same time, it uses the surface relay node to analyze the target baseband signal light of the target air node to obtain the link signal-to-noise ratio. Based on the link distance and the link signal-to-noise ratio, and combined with the first preset link conditions and the second preset link conditions, a control signal is generated.

[0062] The modulation and demodulation unit 140 is used to send control signals to the target air node, so that the target air node switches the target signal light modulation mode, adjusts the splitting ratio of the frequency-doubled light and the power distribution strategy of the splitter according to the target communication node of the target air node, so as to optimize the communication performance with the target communication node, demodulates the target communication data of the underwater target node through the surface relay node, and sends the demodulated target communication data to the target air node through a two-way communication link.

[0063] It should be noted that, as Figure 2 As shown, the adaptive communication control module 203 in this embodiment mainly includes a position determination unit, a data analysis unit, and a modulation and demodulation unit 140.

[0064] In this embodiment, the optical transceiver antenna 150 emits beacon light that scans within a predetermined coverage area and hits the tracking device of the water surface relay node 200. The air node 100 and the water surface relay node 200 capture and track each other's beacon light, establishing an initial communication link.

[0065] In the embodiments of this application, the underwater node 300 (the target communication node includes the underwater node 300 or other surface relay nodes 400) of the above-mentioned target communication node is equipped with the same tracking and aiming device as the surface relay node 200. Since the air node 100 informs the surface relay node 200 of the target node information to which the link to be established before formally transmitting communication data, the relay node 200 and the underwater node 300 will pre-emit beacon light and establish a communication link by capturing and tracking each other's beacon light. The surface relay node 200 sends the information to the underwater node 300, thereby completing the establishment of the downlink.

[0066] In this embodiment of the application, the location determination unit sends the beacon light of the surface relay node to the underwater. After the underwater node 300 receives the beacon light by referring to the tracking process of the relay node 200, the surface relay node 200 learns the location information of the underwater node 300.

[0067] Furthermore, in the embodiments of this application, the data analysis unit enables the surface relay node 200 to calculate the link distance with the underwater node 300 using the received location information; at the same time, the relay node 200 directly analyzes the received signal light from the air node 100 to obtain the signal-to-noise ratio of the link.

[0068] Optionally, in one embodiment of this application, the relay system 20 for air-water cross-medium communication of this application includes a pulsed laser 110 and a continuous laser 120.

[0069] Among them, the pulsed laser 110 is used to switch the target signal light modulation mode to pulsed light modulation mode when the link distance and link signal-to-noise ratio meet the first preset link conditions.

[0070] The continuous light laser 120 is used to switch the target signal light modulation mode to continuous light modulation mode when the link distance and link signal-to-noise ratio meet the second preset link conditions.

[0071] In specific implementation, embodiments of this application can use the adaptive communication control module 203 to send control information to the air node 100 when the link distance is long or the signal-to-noise ratio is low, and use the switching pulse light modulation mode to make the pulse laser 110 modulate the signal light in the form of pulses for output, thereby improving communication reliability and anti-interference capability when the link quality is poor; in addition, when the link distance is short and the signal-to-noise ratio is high, control information is sent to the air node 100 and the continuous light modulation mode is switched to make the continuous light laser 120 modulate the signal light in the form of continuous light for output, thereby enabling data transmission when the signal-to-noise ratio is high and high-speed data transmission is required.

[0072] Therefore, in the embodiments of this application, the adaptive communication control module 203 can control the adjustable beam splitter in the wavelength conversion device to increase the transmittance of the second-harmonic light in scenarios where it is necessary to establish a communication link with the surface relay node 200 and the underwater node 300, thereby increasing the output power of the second-harmonic light and decreasing the output power of the third-harmonic light; and control the beam splitter 240 to increase the reflectivity of the second-harmonic light in scenarios where it is necessary to establish a communication link with other relay nodes 400, thereby decreasing the output power of the second-harmonic light and increasing the output power of the third-harmonic light.

[0073] In the embodiments of this application, the uplink of this application embodiment receives and demodulates the transmission data of the underwater node 300 through the surface relay node 200, loads it into the signal light emitted by the surface relay node 200, and points it to the air node 100 along the original optical path. After demodulation, the air node 100 obtains the information to be transmitted by the underwater node 300, so as to establish a cross-medium communication link between the air node 100 and the underwater node 300.

[0074] It is understood that the embodiments of this application use high-modulation-rate near-infrared light to output high power through an optical fiber amplifier, and generate high-modulation-rate blue-green laser through passive frequency doubling at the water surface relay node 200 for underwater communication, thereby simultaneously meeting the requirements of high-power and high-speed communication.

[0075] In summary, after the underwater node 300 sends data information to the air node 100 and modulates the information, the embodiments of this application can first return the blue-green light carrying the information to the surface relay node 200 along the established communication link. Then, the surface relay node 200 demodulates the returned information and modulates it again through the signal modulation module, loading it into the signal light emitted by the surface relay node 200, and transmitting it to the air node 100 along the original optical path. The demodulation module on the air node 100 demodulates the signal sent by the underwater node 300 to obtain the information to be transmitted by the underwater node 300, thus establishing a cross-medium communication link between the air node 100 and the underwater node 300.

[0076] It is understood that, in the embodiments of this application, the surface relay node 200 senses the quality of the communication link and adaptively controls the modulation mode of the air node 100 based on various parameters such as link distance and signal-to-noise ratio, thereby achieving intelligent control of the signal light modulation mode and frequency doubling optical power allocation; based on parameters such as the link distance and link signal-to-noise ratio between the air node 100 and the target end, it autonomously selects and switches the signal light modulation mode, including pulse light modulation mode and continuous light modulation mode, to achieve the optimal channel capacity; by dynamically adjusting the power allocation of second and third frequency doubling, it optimizes the communication performance of underwater or other relay nodes 400. This switching does not depend on external control and is autonomously completed by the adaptive communication control module 203 of the relay node 200.

[0077] The following describes in detail the operation of the adaptive communication control module 203 in the embodiments of this application.

[0078] As one possible approach, the adaptive communication control module 203 in this embodiment stores training data containing different link distances, SNRs, and corresponding optimal modes (continuous light emission or pulsed light emission). The collected data is used to train a model. During system operation, based on parsing the target node information of the air node 100, the link distance and SNR are obtained in real time by initially establishing a link with the communication target. The trained model is then used for mode prediction and selection. The specific execution steps are as follows:

[0079] S1: Collect and prepare training data, including link distance, signal-to-noise ratio and optimal mode. Convert the data into frame format for easy processing and analysis. Split the dataset into training and test sets for model training and validation.

[0080] S2: Use a machine learning model, train it based on the training set data, make predictions using the test set data, and evaluate the model performance;

[0081] S3: Defines 200 types of relay nodes, including trained models, link distances, signal-to-noise ratios (SNR), and current modes, and is responsible for managing the behavior and states of relay nodes 200. Based on the link distance and SNR, it uses the model to predict the optimal signal modulation scheme and returns the information to air node 100.

[0082] S4: Initialize 200 relay node instances, load the trained model, and calculate the link distance and signal-to-noise ratio between itself and the target node;

[0083] S5: Update the modulation scheme and record the status. Relay node 200 predicts the signal modulation scheme based on the current link conditions and the trained model. Air node 100 updates the signal modulation scheme based on the control information returned by relay node 200.

[0084] It should be noted that, in this embodiment, the surface relay node 200 simultaneously monitors the power of the second-harmonic light and the third-harmonic light of the wavelength conversion device 202. Combined with target node information, in scenarios where a communication link needs to be established with both the relay node 200 and the underwater node 300, the power of the second-harmonic light is increased, and the power of the third-harmonic light is decreased. In scenarios where a communication link needs to be established with both the surface relay node 200 and the other surface relay nodes 400, the power of the second-harmonic light is decreased, and the power of the third-harmonic light is increased. A power control signal is generated and sent to the DAC. Based on different control signals, a corresponding voltage output is generated. The voltage signal controls the adjustable beam splitter to adjust the splitting ratio of the 532nm light, thereby achieving dynamic power control. After the 532nm light is emitted, it communicates with the underwater node 300 through the established surface-to-underwater communication link. After the 266nm light is emitted, it is broadcast to the other relay nodes 400 using the scattering characteristics of ultraviolet light.

[0085] Therefore, the embodiments of this application can select the subsequent communication mode according to the real-time link conditions after the initial link establishment, and automatically switch the power allocation according to the monitored link status, which solves the problem that a single power allocation cannot adapt to multiple communication scenarios. Moreover, it can optimize the communication performance by switching to pulsed optical communication under low channel quality conditions, thereby improving the flexibility and adaptability of the system.

[0086] The execution logic of the relay system for air-water cross-medium communication of this application will be described below through a specific embodiment and in conjunction with the accompanying drawings.

[0087] Figure 3 This is a schematic diagram illustrating the execution logic of the relay system for air-to-water cross-medium communication according to this application. Figure 3 As shown, the execution process of the relay system for air-to-water cross-medium communication in this application is as follows:

[0088] S301: Air node 100 scans water surface relay node 200 by transmitting beacon light, and the water surface node tracks and establishes a communication link;

[0089] S302: The air node 100 switches between continuous light or pulsed light output to modulate the signal light according to the control information sent by the relay node 200, and communicates with the water surface relay node 200.

[0090] S303: The water surface relay node 200 and the target communication node of the air node 100 initially establish a link, and calculate the link distance and link signal-to-noise ratio information;

[0091] S304: The adaptive communication control module 203 determines the signal optical modulation method based on the link distance and signal-to-noise ratio calculated in the previous step, and feeds it back to the air node 100, such as... Figure 4 As shown;

[0092] S305: The adaptive communication control module 203 adjusts the frequency-doubled light splitting ratio according to the target communication node, and the adjustable beam splitter controls the transmittance and reflectance of the second-frequency-doubled light;

[0093] S306: Air node 100 establishes a bidirectional link with the target node.

[0094] The relay system for air-to-water cross-medium communication proposed in this application includes a transmission module 201, used to transmit target baseband signal light and target beacon light through a target air node 100, and to construct an initial communication link between the air node 100 and the surface relay node 200 based on the target baseband signal light, the target beacon light and a preset scanning mode, wherein the target baseband signal light is near-infrared light; a wavelength conversion device 202, used to generate a frequency-doubled light corresponding to the baseband signal light based on the baseband signal light and a preset frequency-doubled strategy, so as to use the frequency-doubled light to conduct link communication in a preset surface-to-underwater communication link; and an adaptive communication control module 203, used to acquire the position information of the underwater target node 300, analyze the communication quality of the initial communication link through the position information, obtain the analysis results, determine the modulation mode of the target signal light based on the analysis results, and adjust the splitting ratio of the frequency-doubled light and the power allocation strategy of the splitter according to the target communication node of the target air node to optimize the communication performance with the target communication node, and establish a bidirectional communication link between the target air node 100 and the target communication node to transmit target communication data using the bidirectional communication link. This application optimizes communication performance with underwater or other surface relay nodes 400 by using near-infrared lasers for air-to-water communication, thereby effectively improving the concealment of communication.

[0095] Secondly, a relay method for air-water cross-medium communication according to an embodiment of this application is described with reference to the accompanying drawings.

[0096] Figure 5 This is a flowchart illustrating a relay method for air-water cross-medium communication provided in an embodiment of this application.

[0097] like Figure 5 As shown, the relay method for air-to-water cross-medium communication includes the following steps:

[0098] In step S501, the target air node transmits the target baseband signal light and the target beacon light, and establishes an initial communication link between the air node and the water surface relay node based on the target baseband signal light, the target beacon light and the preset scanning mode, wherein the target baseband signal light is near-infrared light.

[0099] Optionally, in one embodiment of this application, the target air node transmits a target baseband signal light and a target beacon light, and establishes an initial communication link between the air node and the surface relay node based on the target baseband signal light, the target beacon light, and a preset scanning mode. This includes: controlling a preset optical transceiver antenna through the surface relay node to track the target beacon light according to the target scanning mode, so as to detect the intensity of the target beacon light in real time and obtain an intensity detection result; obtaining the initial position of the target air node through the intensity detection result, and determining the final position of the target air node based on the target scanning mode and the initial position, so as to establish an initial communication link based on the final position.

[0100] In step S502, based on the baseband signal light and the preset frequency doubling strategy, the frequency doubling light corresponding to the baseband signal light is generated, so as to use the frequency doubling light to carry out link communication in the preset surface-underwater communication link.

[0101] In step S503, the location information of the underwater target node is obtained by transmitting target beacon light through the surface relay node. The communication quality of the initial communication link is analyzed through the location information to obtain the analysis results. Based on the analysis results, the target signal light modulation mode is determined, and a two-way communication link is established between the target air node and the underwater target node to transmit target communication data using the two-way communication link.

[0102] It should be noted that the explanation of the relay system embodiment for air-water cross-medium communication described above also applies to the relay method for air-water cross-medium communication in this embodiment, and will not be repeated here.

[0103] According to the relay method for air-to-water cross-medium communication proposed in this application, a target air node transmits a target baseband signal light and a target beacon light. An initial communication link is constructed between the air node and the surface relay node based on the target baseband signal light, the target beacon light, and a preset scanning mode. The target baseband signal light is near-infrared light. Based on the baseband signal light and a preset frequency doubling strategy, a frequency-doubled light corresponding to the baseband signal light is generated to facilitate communication within a preset surface-to-underwater communication link. The surface relay node transmits the beacon light to the target communication node, and both parties track each other to obtain position information. The communication quality of the initial communication link is analyzed using the position information to obtain analysis results. Based on the analysis results, the modulation method of the target signal light is determined, and a bidirectional communication link is established between the target air node and the underwater target node to transmit target communication data. This application optimizes communication performance with underwater or other relay nodes by using near-infrared lasers for air-to-water communication, effectively improving the stealth of communication.

[0104] Figure 6 A schematic diagram of the structure of an electronic device provided in an embodiment of this application. The electronic device may include:

[0105] The memory 601, the processor 602, and the computer program stored on the memory 601 and capable of running on the processor 602.

[0106] When the processor 602 executes the program, it implements the relay method for air-water cross-medium communication provided in the above embodiments.

[0107] Furthermore, electronic devices also include:

[0108] Communication interface 603 is used for communication between memory 601 and processor 602.

[0109] The memory 601 is used to store computer programs that can run on the processor 602.

[0110] The memory 601 may include high-speed RAM memory, and may also include non-volatile memory, such as at least one disk storage device.

[0111] If the memory 601, processor 602, and communication interface 603 are implemented independently, then the communication interface 603, memory 601, and processor 602 can be interconnected via a bus to complete communication between them. The bus can be an Industry Standard Architecture (ISA) bus, a Peripheral Component Interconnect (PCI) bus, or an Extended Industry Standard Architecture (EISA) bus, etc. Buses can be categorized as address buses, data buses, control buses, etc. For ease of representation, Figure 6 The bus is represented by a single thick line, but this does not mean that there is only one bus or one type of bus.

[0112] Optionally, in a specific implementation, if the memory 601, processor 602, and communication interface 603 are integrated on a single chip, then the memory 601, processor 602, and communication interface 603 can communicate with each other through an internal interface.

[0113] The processor 602 may be a central processing unit (CPU), an application specific integrated circuit (ASIC), or one or more integrated circuits configured to implement the embodiments of this application.

[0114] This application also provides a computer-readable storage medium storing a computer program that, when executed by a processor, implements the above-described relay method for air-water cross-medium communication.

[0115] This application also provides a computer program product, including a computer program, which, when executed, is used to implement the above-described relay method for air-water cross-medium communication.

[0116] In the description of this specification, the references to terms such as "one embodiment," "some embodiments," "example," "specific example," or "some examples," etc., indicate that a specific feature, structure, material, or characteristic described in connection with that embodiment or example is included in at least one embodiment or example of this application. In this specification, the illustrative expressions of the above terms do not necessarily refer to the same embodiment or example. Furthermore, the specific features, structures, materials, or characteristics described may be combined in any suitable manner in one or more embodiments or examples. Moreover, without contradiction, those skilled in the art can combine and integrate the different embodiments or examples described in this specification, as well as the features of different embodiments or examples.

[0117] Furthermore, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include at least one of that feature. In the description of this application, "N" means at least two, such as two, three, etc., unless otherwise explicitly specified.

[0118] Any process or method described in the flowchart or otherwise herein can be understood as representing a module, segment, or portion of code comprising one or N executable instructions for implementing custom logic functions or processes, and the scope of the preferred embodiments of this application includes additional implementations in which functions may be performed not in the order shown or discussed, including substantially simultaneously or in reverse order depending on the functions involved, as should be understood by those skilled in the art to which embodiments of this application pertain.

[0119] The logic and / or steps represented in the flowchart or otherwise described herein, for example, can be considered as a sequenced list of executable instructions for implementing logical functions, and can be embodied in any computer-readable medium for use by, or in conjunction with, an instruction execution system, apparatus, or device (such as a computer-based system, a processor-included system, or other system that can fetch and execute instructions from, an instruction execution system, apparatus, or device). For the purposes of this specification, "computer-readable medium" can be any means that can contain, store, communicate, propagate, or transmit programs for use by, or in conjunction with, an instruction execution system, apparatus, or device. More specific examples (a non-exhaustive list) of computer-readable media include: an electrical connection having one or more wires (electronic device), a portable computer disk drive (magnetic device), random access memory (RAM), read-only memory (ROM), erasable and editable read-only memory (EPROM or flash memory), fiber optic devices, and portable optical disc read-only memory (CDROM). Alternatively, the computer-readable medium may be paper or other suitable media on which the program can be printed, since the program can be obtained electronically by optically scanning the paper or other medium, followed by editing, interpreting, or otherwise processing as necessary, and then stored in a computer memory.

[0120] It should be understood that the various parts of this application can be implemented using hardware, software, firmware, or a combination thereof. In the above embodiments, the N steps or methods can be implemented using software or firmware stored in memory and executed by a suitable instruction execution system. If implemented in hardware, as in another embodiment, it can be implemented using any one or a combination of the following techniques known in the art: discrete logic circuits having logic gates for implementing logical functions on data signals, application-specific integrated circuits (ASICs) having suitable combinational logic gates, programmable gate arrays (PGAs), field-programmable gate arrays (FPGAs), etc.

[0121] Those skilled in the art will understand that all or part of the steps of the methods in the above embodiments can be implemented by a program instructing related hardware. The program can be stored in a computer-readable storage medium, and when executed, the program includes one or a combination of the steps of the method embodiments.

[0122] Furthermore, the functional units in the various embodiments of this application can be integrated into a processing module, or each unit can exist physically separately, or two or more units can be integrated into a module. The integrated module can be implemented in hardware or as a software functional module. If the integrated module is implemented as a software functional module and sold or used as an independent product, it can also be stored in a computer-readable storage medium.

[0123] The storage medium mentioned above can be a read-only memory, a disk, or an optical disk, etc. Although embodiments of this application have been shown and described above, it is understood that the above embodiments are exemplary and should not be construed as limiting this application. Those skilled in the art can make changes, modifications, substitutions, and variations to the above embodiments within the scope of this application.

Claims

1. A relay system for air-water cross-medium communication, characterized by, Comprising: a transmission module for transmitting target base frequency signal light and target beacon light through a target air node, and constructing an initial communication link between the air node and a water surface relay node according to the target base frequency signal light, the target beacon light and a preset scanning mode, wherein the target base frequency signal light is near-infrared light; a wavelength conversion device for generating frequency-doubled light corresponding to the base frequency signal light based on the base frequency signal light and a preset frequency-doubling strategy, to perform link communication in a preset water surface-underwater communication link using the frequency-doubled light; an adaptive communication control module for obtaining position information of an underwater target node, analyzing the communication quality of the initial communication link through the position information, obtaining an analysis result, determining a target signal light modulation mode according to the analysis result, and establishing a bidirectional communication link between the target air node and the underwater target node to transmit target communication data using the bidirectional communication link.

2. The system of claim 1, wherein, The transmission module comprises: an optical transceiving antenna for determining a target scanning mode to scan the target beacon light through the target scanning mode; an air-water node communication unit for controlling the optical transceiving antenna to track the target beacon light according to the target scanning mode based on the water surface relay node, to detect the intensity of the target beacon light in real time, obtain an intensity detection result, and obtain an initial position of the target air node through the intensity detection result, and determine a final position of the target air node based on the target scanning mode and the initial position to establish the initial communication link according to the final position.

3. The system of claim 1, wherein, Further comprising: a fiber coupling unit; a deformable mirror for introducing the target base frequency signal light into the fiber coupling unit through the initial communication link; a beam splitter for splitting the target base frequency signal light in the fiber coupling unit to generate a split signal; a photodetector for detecting a light intensity signal of the split signal; a master control unit for generating a driver control signal according to the light intensity signal to control the deformable mirror to perform low-order correction on the target base frequency signal light through the driver control signal.

4. The system of claim 1, wherein, Further comprising: a pulsed light laser for switching the target signal light modulation mode to a pulsed light modulation mode when the link distance and the link signal-to-noise ratio meet a first preset link condition; a continuous light laser for switching the target signal light modulation mode to a continuous light modulation mode when the link distance and the link signal-to-noise ratio meet a second preset link condition.

5. The system of claim 1, wherein, The adaptive communication control module comprises: a position determination unit for sending the target beacon light to a target communication node through the water surface relay node, so that the target communication node and the water surface relay node track each other to obtain position information, and establish a water surface-underwater communication link between the water surface relay node and the target communication node according to the position information; a data analysis unit configured to calculate, by the water surface relay node, a link distance of the water surface-underwater communication link between the water surface relay node and the target aerial node according to the position information, analyze a target base frequency signal light of the target aerial node by the water surface relay node to obtain a link signal-to-noise ratio, and generate a control signal based on the link distance and the link signal-to-noise ratio in combination with a first preset link condition and a second preset link condition; a modulation and demodulation unit configured to send the control signal to the target aerial node, so that the target aerial node switches a target signal light modulation mode, regulates a light splitting ratio of the frequency-doubled light and a power distribution strategy of a light splitter according to a target communication node of the target aerial node, to optimize a communication performance with the target communication node, demodulates target communication data of the underwater target node by the water surface relay node, and sends the demodulated target communication data to the target aerial node through the bidirectional communication link.

6. A method for relaying air-water cross-medium communication, characterized in that, The method comprises the following steps: emitting, by a target aerial node, a target base frequency signal light and a target beacon light, and constructing an initial communication link between the aerial node and a water surface relay node according to the target base frequency signal light, the target beacon light and a preset scanning mode, wherein the target base frequency signal light is near-infrared light; generating, based on the base frequency signal light and a preset frequency-doubling strategy, frequency-doubled light corresponding to the base frequency signal light, to perform link communication in a preset water surface-underwater communication link by using the frequency-doubled light; emitting, by the water surface relay node, the target beacon light to obtain position information of an underwater target node, analyzing communication quality of the initial communication link by using the position information, obtaining an analysis result, determining a target signal light modulation mode according to the analysis result, and establishing a bidirectional communication link between the target aerial node and the underwater target node, to transmit target communication data by using the bidirectional communication link.

7. The method of claim 6, wherein, The step of emitting, by a target aerial node, a target base frequency signal light and a target beacon light, and constructing an initial communication link between the aerial node and a water surface relay node according to the target base frequency signal light, the target beacon light and a preset scanning mode, comprises: controlling, by the water surface relay node, a preset optical transceiver antenna to track the target beacon light according to a target scanning mode, to detect intensity of the target beacon light in real time and obtain an intensity detection result; obtaining an initial position of the target aerial node by using the intensity detection result, and determining a final position of the target aerial node based on the target scanning mode and the initial position, to establish the initial communication link according to the final position.

8. An electronic device, comprising: The method comprises: a memory, a processor and a computer program stored in the memory and executable on the processor, wherein the processor executes the program to implement the relay method for air-water cross-medium communication according to any one of claims 6-7.

9. A computer readable storage medium having stored thereon a computer program, characterized in that, The program is executed by the processor to implement the relay method for air-water cross-medium communication according to any one of claims 6-7.

10. A computer program product comprising a computer program, characterized in that, The computer program is executed for implementing the method of relaying air-water cross-medium communication according to any one of claims 6-7. The computer program is executed for implementing the method of relaying air-water cross-medium communication according to any one of claims 6-7.

Images