Air-sea cross-domain communication link channel optimization method

Abstract

The invention relates to the technical field of air-sea cross-medium communication, discloses an air-sea cross-domain communication link channel optimization method, and aims at solving the problem that the air-sea communication resource use condition and the air-sea cross-domain communication stable state of an existing cross-domain communication gateway are poor. According to the method, by adding an overwater and underwater communication mode of the cross-domain communication gateway and establishing an airspace and sea area communication channel model and a link communication handshake query method, the problems of an existing cross-domain communication gateway in the aspects of the air-sea communication resource use condition and the air-sea cross-domain communication stable state are effectively improved. According to the air-sea cross-domain communication link channel optimization method provided by the invention, the efficient use of existing communication resources of a cross-domain communication gateway is improved, the stability of communication interaction is enhanced, and effective emergency processing can be carried out on communication abnormal conditions.

Description

Technical Field

[0001] The present invention relates to the technical field of air-sea cross-medium communication, and in particular to a method for optimizing air-sea cross-domain communication link channels. Background Art

[0002] The problem of cross-medium communication between air and sea is a key issue in the field of ocean observation. As people continue to explore the ocean world, the problem of cross-medium communication between air and sea has become increasingly important. However, radio waves with good transmission characteristics in the air are rapidly attenuated underwater, and sound waves with good transmission characteristics underwater cannot break through the sea surface and reach the air. Therefore, if signals in common frequency bands are used for communication, additional relay communication nodes are required, which results in many limitations.

[0003] Cross-domain communication gateway technology is an effective method to achieve cross-medium communication in the air and sea. In recent years, cross-domain communication gateways that support wireless and underwater acoustic dual-mode communication have been widely deployed as relay nodes. The two communicating terminals in the air and sea need to transmit signals to the cross-domain communication gateway on the sea surface at an agreed time and location. The cross-domain communication gateway realizes the conversion and transmission between wireless signals and sound signals, and finally the wireless communication nodes and underwater acoustic communication nodes receive their respective information. As an information forwarding medium, the cross-domain communication gateway efficiently realizes the transmission of observation data and the delivery of control instructions; however, the existing cross-domain communication gateways still have major problems in terms of the use of air-sea communication resources and the stability of air-sea cross-domain communication.

[0004] Therefore, it is necessary to provide a channel optimization method for air-sea cross-domain communication links to solve the above technical problems. Summary of the invention

[0005] The present invention proposes a method for optimizing air-sea cross-domain communication link channels, which increases the above-water and underwater communication modes of cross-domain communication gateways, establishes an air-sea communication channel model and a link communication handshake query method, so as to effectively improve the existing cross-domain communication gateway air-sea communication resource utilization and the poor stability of air-sea cross-domain communication.

[0006] The air-sea cross-domain communication link channel optimization method proposed in the present invention mainly includes three parts:

[0007] ① Various cross-domain communication gateways for above-water and underwater communication;

[0008] ② Link communication handshake query method based on information interaction;

[0009] ③Prediction of airspace and sea area communication channel model.

[0010] Preferably, the above-water and underwater communication modes of the multiple cross-domain communication gateways include:

[0011] a. Three types of maritime communication: satellite communication, mobile communication and digital radio communication;

[0012] b. Two underwater communication modulation methods: OFDM modulation method for underwater acoustic communication and spread spectrum modulation method for underwater acoustic communication.

[0013] Preferably, the link communication handshake query method based on information interaction includes turning the transmission control module on and off and a three-way handshake mechanism, wherein the cross-domain communication gateway serves as communication terminal 1, the shore-based computer platform, and the underwater unmanned node serve as communication terminal 2, communication terminal 1 and communication terminal 2 first turn on the transmission control module, and after the transmission control module is turned on, communication terminal 1 and communication terminal 2 perform three-way handshakes to confirm the communication status; the link communication handshake query method based on information interaction is used for communication application scenarios with a short information transmission distance and a short communication delay, and is specifically used in the evaluation of the link status of water radio communications and the evaluation of the link status of underwater hydroacoustic channels.

[0014] Preferably, the airspace and sea area communication channel model prediction includes airspace radio communication channel model prediction and sea area hydroacoustic communication channel model prediction, namely: obtaining airspace characteristic information of the working area of ​​the cross-domain communication gateway, establishing a water radio communication channel model, and evaluating the communication channel status according to the signal-to-noise ratio and the bit error rate; obtaining sea area characteristic information of the working area of ​​the cross-domain communication gateway, establishing an underwater hydroacoustic communication channel model, and evaluating the communication channel status according to the signal-to-noise ratio and the bit error rate; deploying an airspace radio communication channel model and a sea area hydroacoustic communication channel model that match the working area of ​​the gateway in the cross-domain communication gateway, collecting ocean information through a variety of sensors (such as wind speed and direction instruments, inertial sensors, wave sensors, etc.) to improve the airspace and sea area communication channel model, and in communication application scenarios where the communication information transmission distance is long and the communication delay is large, the airspace and sea area communication channel model prediction method is used to confirm the water radio communication link status and the underwater hydroacoustic channel long-distance communication link status.

[0015] Preferably, when selecting a cross-domain communication link, a link communication handshake query method based on information interaction is first adopted to select the communication link. If it is detected that the communication link status of the current communication mode meets the communication task requirements, the communication task is executed; if it is detected that the communication link status of the current communication mode cannot meet the communication task requirements, the communication mode is automatically switched to perform a communication link handshake query; if it is detected that all communication modes cannot meet the communication task requirements, the airspace and sea area communication channel model is used to predict and evaluate the communication of the current communication mode.

[0016] Preferably, when it is detected through the link communication handshake query method based on information interaction that all communication modes cannot meet the communication task requirements, the airspace and sea area communication channel model prediction and evaluation is adopted to select the communication link. If it is predicted that the current communication link status meets the task requirements, the communication task is executed, and at the same time, the communication terminal 2 is required to send confirmation information such as the attribute characteristics of the received information to the communication terminal 1 after receiving the communication information; if it is predicted that the communication link status of the current communication mode cannot meet the communication task requirements, the communication mode is automatically switched to perform airspace and sea area communication channel model prediction. If it is detected that all communication modes cannot meet the communication task requirements, the cross-domain communication link optimization selection method is restarted after waiting for a specified time. When the cross-domain communication link optimization selection method is executed more than the specified number of times and it is still not detected that the communication link meets the communication task requirements, emergency measures are executed.

[0017] Preferably, the setting of the prescribed time and the prescribed number of times can be deployed in the cross-domain communication gateway by setting specific values ​​in advance, or can be obtained by calculation through a specified algorithm.

[0018] Preferably, the emergency measures include but are not limited to directly using multiple communication methods to send emergency confirmation information to the target node and requiring the target node to give receipt information, the cross-domain communication gateway entering a dormant state, etc.

[0019] Compared with the related art, the channel optimization method for air-sea cross-domain communication link proposed in the present invention has the following beneficial effects:

[0020] The present invention uses air and sea communication resources to a greater extent by setting up a variety of cross-domain communication gateways for on-water and underwater communication modes, and facilitates switching to another communication mode for communication when a certain communication mode is unavailable.

[0021] The present invention uses a link communication handshake query method based on information interaction to evaluate the water radio communication link status and the underwater hydroacoustic channel short-distance communication link status in a communication application scenario where the information transmission distance is short and the communication delay is short, and establishes an airspace radio communication channel model and a sea area hydroacoustic communication channel model to predict the water radio communication link status and the underwater hydroacoustic channel long-distance communication link status in a communication application scenario where the communication information transmission distance is long and the communication delay is large. The link communication handshake query method based on information interaction is combined with the prediction of the airspace and sea area communication channel model to comprehensively evaluate the quality of the target transmission communication link status, and take emergency measures when necessary. Through the above series of measures, the efficient use of the existing communication resources of the cross-domain communication gateway is increased, the stability of the cross-domain communication gateway's communication interaction with the outside world is enhanced, and effective emergency handling can be made for communication abnormalities. BRIEF DESCRIPTION OF THE DRAWINGS

[0022] Figure 1 A schematic diagram of a cross-domain communication gateway communication method according to an embodiment of the present invention;

[0023] Figure 2 A schematic diagram of a link communication handshake query method based on information interaction according to an embodiment of the present invention;

[0024] Figure 3 A schematic diagram of airspace and sea area communication channel model prediction according to an embodiment of the present invention;

[0025] Figure 4 A schematic diagram of a flow chart of a method for selecting channels for air-sea cross-domain communication links according to an embodiment of the present invention;

[0026] Figure 5 The present invention is a schematic diagram of an application scenario of a channel optimization method for air-sea cross-domain communication links according to an embodiment of the present invention. DETAILED DESCRIPTION

[0027] The present invention will be further described below in conjunction with the accompanying drawings and implementation modes.

[0028] In order to make the purpose, technical solutions and advantages of the embodiments of the present application clearer, the technical solutions in the embodiments of the present application will be clearly and completely described below in conjunction with the drawings in the embodiments of the present application. Obviously, the described embodiments are only part of the embodiments of the present application, not all of the embodiments.

[0029] refer to Figure 1 The present invention provides a cross-domain communication gateway multi-communication mode design structure. In an embodiment of the present invention, the cross-domain communication gateway multi-communication mode design structure mainly includes an energy management module, an above-water communication module, an underwater communication module dry end, an underwater communication module wet end and a control unit module.

[0030] In a further embodiment of the present invention, the energy management module includes components such as a battery, a voltage conversion device, an STM32 single-chip microcomputer, and a relay. The battery is responsible for providing energy supply. The voltage conversion device includes a 3.3V voltage conversion board, a 5V voltage conversion board, a 12V voltage conversion board, and a 24V voltage conversion board. The battery can stably output 3.3V, 5V, 12V, and 24V voltages through the voltage conversion device. Writing the burning program code can download power supply control instruction information in the STM32 single-chip microcomputer, orderly control the power supply through the relay, and obtain battery power information at the same time.

[0031] In a further embodiment of the present invention, the water communication module includes communication equipment such as Beidou communication positioning terminal, mobile communication terminal, data transmission radio, etc. The water communication module realizes information exchange with the control unit module through wired communication.

[0032] In a further embodiment of the present invention, the dry end of the underwater communication module is located inside the cross-domain communication gateway, and the wet end of the underwater communication module is located in a fixed depth seawater area, and the two communicate through a watertight cable. The wet end of the underwater communication module realizes the conversion between electrical signals and acoustic signals.

[0033] In a further embodiment of the present invention, the control unit module is responsible for realizing information interaction with the above-water and underwater communication modules, storage, analysis and forwarding of data information, and implementation control of the program code of the air-sea cross-domain communication link channel optimization method, etc. Gateway operation control mechanism. Further, the control unit module is responsible for realizing link communication handshake query based on information interaction through communication with the above-water and underwater communication modules, improving the airspace radio communication channel model and the sea area hydroacoustic communication channel model by receiving information collected by the sensor, and evaluating the communication link status through the established airspace and sea area model, and then confirming whether to execute the communication task.

[0034] In an embodiment of the present invention, the link communication handshake query method based on information interaction is used in communication application scenarios where the information transmission distance is short and the communication delay is short, and is specifically used in the evaluation of the link status of water radio communication and the evaluation of the link status of underwater hydroacoustic channel short-distance communication. Figure 2 As shown, the cross-domain communication gateway, the shore-based computer control platform and the underwater unmanned node can all be used as the communication terminal 1 or the communication terminal 2. The information exchange between the communication terminal 1 and the communication terminal 2 based on various communication methods such as satellite communication, mobile communication, digital radio communication, underwater acoustic communication OFDM modulation method, underwater acoustic communication spread spectrum modulation method, etc., is used to perform link communication handshake query.

[0035] In a further embodiment of the present invention, when performing a link communication handshake query based on information interaction, a communication mode is first selected, and then the communication terminal 2 creates a transmission control block, enters a listening state, and prepares to receive a request. A three-way handshake operation is mainly performed to evaluate the communication link state, and the specific process is as follows:

[0036] First handshake: Communication terminal 1--request (send request SYN+current sequence number seq of data packet, no response required). The specific process is: Communication terminal 1 creates a transmission control block and enters the listening state. Set SYN=1, indicating that this is a handshake message, and send it to communication terminal 2, set the sequence number of the sent data packet seq=x, and communication terminal 1 is in the synchronous sent state.

[0037] Second handshake: Communication terminal 2--confirmation (send response ACK + request SYN + confirmation number ack of the previous data packet + current data packet sequence number seq). The specific process is that communication terminal 2 sets ACK=1, indicating confirmation response. Set ack=x+1, indicating that the data before communication terminal 1x has been received, and it is hoped that the next data will start from x+1. Set SYN=1, indicating a handshake message, and send it to communication terminal 1. Set the sent data packet sequence number seq=y. At this time, communication terminal 2 is in a synchronous received state.

[0038] The third handshake: Communication terminal 1--confirms the confirmation of communication terminal 2 (sends the response ACK + confirms the confirmation number ack of the previous data packet + the sequence number seq of the current data packet, the connection has been established, no request is required). The specific process is: Communication terminal 1 sets ACK=1, indicating confirmation of the response. Set ack=y+1, indicating that the data packet with sequence number seq=y sent by the server is received, and it is hoped that the next data will start from y+1. Set seq=x+1, indicating that the previous data packet seq=x will continue to be sent.

[0039] At this point, the three-way handshake is completed. If there is no abnormality in the communication handshake detection and the communication delay meets the communication task requirements, the communication information is sent, otherwise the communication mode is switched and the next step is performed.

[0040] In the embodiment of the present invention, in the communication application scenario where the communication information transmission distance is long and the communication delay is large, the airspace and sea area communication channel model prediction method is used to confirm the state of the water radio communication link and the state of the underwater hydroacoustic channel long-distance communication link. Figure 3 As shown, the prediction of the airspace and sea communication channel model mainly includes the prediction of the water radio communication link status and the underwater acoustic communication channel model.

[0041] In the prediction of the state of the water radio communication link, the signal carrying the communication information content is used as the source. After being processed by the sending device, it is sent out through the water radio communication channel to reach the target receiving point. The receiving device is responsible for correctly recovering the original signal from the received signal with interference, and the destination receives the communication message. Among them, the water radio communication model is based on the analysis of the transmission loss characteristics of the cross-domain communication gateway air-to-sea and near-sea communication ranges of two scales of maritime satellite communication, mobile communication, and digital radio communication. The dynamic wave model and real-time sea surface multipath model that vary depending on the sea conditions are jointly established to construct a unified water radio communication model. At the same time, according to the different water communication methods, the cross-domain communication gateway performs parameter correction internally to better meet the characteristics of the communication method. Based on the information such as maritime sensor data, sea condition level, and system noise power in historical communication records, the communication channel impulse response, system noise and other parameters of the water radio communication channel model are obtained, and the system signal-to-noise ratio, carrier-to-noise ratio, bit error rate, and communication delay are calculated to evaluate whether the communication link state meets the communication task requirements.

[0042] The underwater acoustic communication channel model predicts that the signal carrying the communication information content is used as the source, which is processed by the sending device and sent out through the underwater acoustic communication signal to the target receiving point. The receiving device is responsible for correctly recovering the original signal from the received signal with interference, and the destination receives the communication message. Among them, the signal modulation methods in the sending device are OFDM modulation and spread spectrum modulation. Correspondingly, the signal demodulation methods in the receiving device are OFDM demodulation and spread spectrum demodulation. Among them, the underwater acoustic communication model is established based on the working sea area characteristics of the cross-domain communication gateway. In particular, the working sea area characteristics of the cross-domain communication gateway include sea surface conditions, sea depth, seabed topography, sound speed profile and other ocean parameters. Taking historical communication information as a reference, based on the underwater acoustic communication channel model, the channel impulse response, system noise and other parameters are obtained, and the system signal-to-noise ratio, bit error rate, and communication delay are calculated to evaluate whether the channel performance meets the communication task requirements.

[0043] In an embodiment of the present invention, after the cross-domain communication gateway receives the communication task, the air-sea cross-domain communication link channel optimization method is started. The specific process is as follows: Figure 4 As shown:

[0044] First, collect ocean data through sensors, improve the air and sea communication channel model, confirm the communication task requirements, extract the communication task features to select the communication method, and perform a link communication handshake query based on information interaction on the current communication method. Through the link communication handshake query, detect whether the current communication method meets the communication task requirements. If it meets the communication task requirements, send the communication information and wait for the receipt information to determine whether the receipt information is correct. If the receipt information is correct, execute the communication task and the method ends. If the receipt information is incorrect, re-query the link communication handshake based on information interaction on the current communication method to detect whether the current communication method meets the communication task requirements. If it meets the communication task requirements, send the information. If it does not meet the communication task requirements, further detect whether all communication methods have passed the link communication handshake query based on information interaction. If the result is no, switch the communication method and return to the link communication handshake query based on information interaction on the current communication method. If the result is yes, the communication task requirements are confirmed again, the communication task features are extracted to select the communication method, and the airspace and sea area communication channel model is predicted for the current communication method to detect whether the current communication method meets the communication task requirements. If the result is yes, the communication information is sent and the receipt information is waited for. If the receipt information is incorrect, the method returns to predicting the airspace and sea area communication channel model for the current communication method. If the receipt information is correct, the communication task is executed and the method ends. If it is detected that the current communication method does not meet the communication task requirements, it is detected whether all communication methods have been predicted by the airspace and sea area communication channel model. If the result is no, the communication method is switched and the method returns to predicting the airspace and sea area communication channel model for the current communication method. If the result is no, the cross-domain link optimization is performed again after waiting for the specified time. After executing the cross-domain link optimization method multiple times, if the communication task is successfully executed, the method execution ends. Otherwise, it is determined whether the number of executions of the cross-domain link optimization method exceeds the specified number of times. If the result is no, it returns to waiting for the specified time and then re-performs the cross-domain link optimization. If the result is yes, emergency measures are taken. The emergency measures include but are not limited to directly using multiple communication methods to send emergency confirmation information to the target node multiple times and requiring the target node to give receipt information, the cross-domain communication gateway enters a dormant state, etc. The emergency measures are executed and the method execution ends.

[0045] In the embodiment of the present invention, the air-sea cross-domain communication link channel optimization method is applied in the following scenarios: Figure 5 As shown, the cross-domain communication gateway is used as the communication terminal 1, the shore-based computer platform and the underwater unmanned node are used as the communication terminal 2, and the control unit module in the cross-domain communication gateway is equipped with the air-sea cross-domain communication link channel optimization method. The air-sea cross-domain communication link channel optimization method is mainly divided into uplink scenarios and downlink scenarios in the application scenarios.

[0046] In a further embodiment of the present invention, in the uplink scenario, the underwater unmanned node and the cross-domain communication gateway transmit information through the hydroacoustic communication method, and both need to switch to the same hydroacoustic communication modulation method to achieve information interaction. After receiving the communication information of the underwater unmanned node, the cross-domain communication gateway analyzes and organizes the information data to form a communication task requirement. After receiving the communication task requirement, the control unit module in the cross-domain communication gateway starts the cross-domain link optimization processing that integrates channel prediction and information interaction, selects the appropriate communication method to interact with the shore-based computer, and completes the communication task.

[0047] In a further embodiment of the present invention, in a downlink communication link scenario, the shore-based computer transmits information to the cross-domain communication gateway through one or more communication methods including Beidou communication, mobile communication, digital radio, and underwater acoustic communication. After receiving the communication information from the shore-based computer, the cross-domain communication gateway analyzes and organizes the information data to form a communication task requirement. After receiving the communication task requirement, the control unit module in the cross-domain communication gateway starts the cross-domain link optimization processing that integrates channel prediction and information interaction. In particular, in the downlink communication link scenario, the cross-domain communication gateway runs the air-sea cross-domain communication link channel optimization method to only perform channel state evaluation and prediction of the underwater acoustic communication method, realize information interaction with underwater unmanned nodes, and complete the communication task.

[0048] Compared with the related art, the channel optimization method for air-sea cross-domain communication link proposed in the present invention has the following beneficial effects:

[0049] The present invention uses air and sea communication resources to a greater extent by setting up a variety of cross-domain communication gateways for on-water and underwater communication modes, and facilitates switching to another communication mode for communication when a certain communication mode is unavailable.

[0050] The present invention uses a link communication handshake query method based on information interaction to evaluate the water radio communication link status and the underwater hydroacoustic channel short-distance communication link status in a communication application scenario where the information transmission distance is short and the communication delay is short, and establishes an airspace radio communication channel model and a sea area hydroacoustic communication channel model to predict the water radio communication link status and the underwater hydroacoustic channel long-distance communication link status in a communication application scenario where the communication information transmission distance is long and the communication delay is large. The link communication handshake query method based on information interaction is combined with the prediction of the airspace and sea area communication channel model to comprehensively evaluate the quality of the target transmission communication link status, and take emergency measures when necessary. Through the above series of measures, the efficient use of the existing communication resources of the cross-domain communication gateway is increased, the stability of the cross-domain communication gateway's communication interaction with the outside world is enhanced, and effective emergency handling can be made for communication abnormalities.

[0051] The above descriptions are merely embodiments of the present invention and are not intended to limit the patent scope of the present invention. Any equivalent structure or equivalent process transformation made using the contents of the present invention specification and drawings, or directly or indirectly applied in other related technical fields, are also included in the patent protection scope of the present invention.

Claims

1. A method for optimizing air-sea cross-domain communication link channels, characterized in that: The following steps are involved: S1. Add multiple cross-domain communication gateways for on-water and underwater communication, and establish air and sea communication channel models and link communication handshake query methods; S2. Collect ocean information through various sensors to improve the air and sea communication channel model; S3. In the communication application scenario where the communication information transmission distance is short and the communication delay is short, the link communication handshake query method based on information interaction is used to evaluate the link status of the water radio communication link and the short-distance communication link status of the underwater hydroacoustic channel; S4. In communication application scenarios where the communication information transmission distance is long and the communication delay is large, the airspace and sea area communication channel model prediction method is used to confirm the status of the water radio communication link and the underwater hydroacoustic channel long-distance communication link; S5. Select a communication link based on the link communication handshake query method and the prediction results of the airspace and sea communication channel model, and take emergency measures when necessary.

2. The method for optimizing air-sea cross-domain communication link channels according to claim 1, characterized in that: A variety of cross-domain communication gateways, above-water and underwater communication methods include: a. Three types of maritime communication: satellite communication, mobile communication and digital radio communication; b. Two underwater communication modulation methods: OFDM modulation method for underwater acoustic communication and spread spectrum modulation method for underwater acoustic communication.

3. The method for optimizing air-sea cross-domain communication link channels according to claim 2, characterized in that: The link communication handshake query method based on information interaction includes turning on and off the transmission control module and a three-way handshake mechanism, wherein the cross-domain communication gateway serves as the communication terminal 1, the shore-based computer platform, and the underwater unmanned node serve as the communication terminal 2. The communication terminal 1 and the communication terminal 2 first turn on the transmission control module. After the transmission control module is turned on, the communication terminal 1 and the communication terminal 2 perform a three-way handshake to confirm the communication status.

4. The method for optimizing air-sea cross-domain communication link channels according to claim 3, characterized in that: The airspace and sea area communication channel model prediction includes airspace radio communication channel model prediction and sea area hydroacoustic communication channel model prediction, namely: obtaining airspace characteristic information of the working area of ​​the cross-domain communication gateway, establishing a water radio communication channel model, and evaluating the communication channel status according to the signal-to-noise ratio and the bit error rate; obtaining the sea area characteristic information of the working area of ​​the cross-domain communication gateway, establishing an underwater hydroacoustic communication channel model, and evaluating the communication channel status according to the signal-to-noise ratio and the bit error rate; deploying an airspace radio communication channel model and a sea area hydroacoustic communication channel model that match the working area of ​​the gateway in the cross-domain communication gateway, and collecting ocean information through a variety of sensors to improve the airspace and sea area communication channel model.

5. The method for optimizing air-sea cross-domain communication link channels according to claim 4, characterized in that: When selecting cross-domain communication links, the link communication handshake query method based on information interaction is first adopted to select the communication link. If it is detected that the communication link status of the current communication mode meets the communication task requirements, the communication task is executed; if it is detected that the communication link status of the current communication mode cannot meet the communication task requirements, the communication mode is automatically switched to perform a communication link handshake query; if it is detected that all communication modes cannot meet the communication task requirements, the airspace and sea communication channel model is used to predict and evaluate the communication of the current communication mode.

6. The method for optimizing air-sea cross-domain communication link channels according to claim 5, characterized in that: When it is detected through the link communication handshake query method based on information interaction that all communication modes cannot meet the communication task requirements, the airspace and sea area communication channel model prediction and evaluation is adopted to select the communication link. If it is predicted that the current communication link status meets the task requirements, the communication task is executed. At the same time, the communication terminal 2 is required to send confirmation information such as the attribute characteristics of the received information to the communication terminal 1 after receiving the communication information; if it is predicted that the communication link status of the current communication mode cannot meet the communication task requirements, the communication mode is automatically switched to perform airspace and sea area communication channel model prediction. If it is detected that all communication modes cannot meet the communication task requirements, the cross-domain communication link optimization selection method is restarted after waiting for a specified time. When the cross-domain communication link optimization selection method is executed more than the specified number of times and the communication link is still not detected to meet the communication task requirements, emergency measures are implemented.

7. The method for optimizing air-sea cross-domain communication link channels according to claim 6, characterized in that: The setting of the prescribed time and the prescribed number of times can be deployed in the cross-domain communication gateway by setting specific values ​​in advance, or can be obtained by calculation through a specified algorithm.

8. The method for optimizing air-sea cross-domain communication link channels according to claim 6, characterized in that: The emergency measures include but are not limited to directly using multiple communication methods to send emergency confirmation information to the target node and requiring the target node to give receipt information, and the cross-domain communication gateway enters a dormant state.

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