A communication method and system for long-distance ships based on L-band communication

Abstract

The invention relates to the technical field of satellite communication, and discloses a communication method and system for a long-distance ship based on L-band communication. The method comprises: identifying the navigation environment and communication requirements of the long-distance ship, identifying the satellite signal of the long-distance ship and the communication end by identifying the frequency band characteristics of the communication frequency band, and setting a signal tracking network for the satellite signal; according to the signal tracking network, monitoring the signal parameters of the satellite signal in real time, and setting a quality feedback mechanism for the signal parameters; identifying the current signal quality level; based on the current signal quality level, identifying the signal quality requirements of the long-distance ship and the communication end, so as to set a multi-beam switching mechanism for pointing beams and a signal locking network for satellite signals, setting a confidentiality path for transmitting data, and generating a communication result between the long-distance ship and the communication end in combination with the multi-beam switching mechanism, the signal locking network and the confidentiality path; the invention can enhance the stability and security of signal transmission and improve the communication quality of the long-distance ship.

Description

Technical Field

[0001] The present invention relates to the field of satellite communication technology, and in particular to a communication method and system for long-distance ships based on L-band communication. Background Art

[0002] Communications for ocean-going ships refers to a communication system designed specifically for ocean-going ships. It ensures the quality of communication of ships around the world through a variety of technologies and means. This communication system not only improves the safety and operational efficiency of the ship, but also provides convenient communication means for the crew. It is an indispensable and important part of modern ocean-going navigation. With the rapid development of the global shipping industry, the communication needs of ocean-going ships are increasing.

[0003] In the prior art, the communication method of long-distance ships mainly relies on the radio communication system. Although the system guarantees the basic communication needs of the ship to a certain extent, it is affected by the communication coverage and weather conditions. For example, VHF is only suitable for short-distance communication, and although HF can cover a longer distance, it is greatly affected by weather conditions, resulting in unstable communication, thus affecting the communication quality of long-distance ships. Summary of the invention

[0004] In order to solve the above problems, the present invention provides a communication method and system for long-distance ships based on L-band communication, which can enhance the stability and security of signal transmission and improve the communication quality of long-distance ships.

[0005] In a first aspect, the present invention provides a communication method for a long-distance ship based on L-band communication, comprising:

[0006] Acquire a long-distance ship to be communicated with and its corresponding communication terminal, identify the navigation environment of the long-distance ship, wherein the navigation environment includes the navigation stage, geographical conditions, and mission nature, locate the position coordinates of the long-distance ship and the communication terminal, and identify the communication requirements of the long-distance ship and the communication terminal based on the navigation environment and the position coordinates, wherein the communication requirements include data transmission volume, communication frequency, and coverage range, and determine the communication frequency band of the long-distance ship according to the communication requirements;

[0007] Identify the frequency band characteristics of the communication frequency band, set a signal search device for the long-distance ship and the communication end according to the frequency band characteristics, identify the satellite signal of the long-distance ship and the communication end based on the signal search device, query the ephemeris data between the long-distance ship and the communication end, and set a signal tracking network for the satellite signal according to the ephemeris data;

[0008] Based on the signal tracking network, the signal parameters of the satellite signal are monitored in real time, a signal quality feedback mechanism of the signal parameters is set, satellite position data of the satellite signal is extracted according to the ephemeris data, a pointing beam of the satellite signal is identified based on the satellite position data, a current signal quality of the satellite signal under the pointing beam is analyzed, and a signal quality level of the current signal quality is identified based on the signal quality feedback mechanism;

[0009] According to the satellite position and the signal quality level, identifying the signal quality requirements of the long-distance ship and the communication end, setting the multi-beam switching mechanism of the directional beam based on the signal quality requirements, and setting the signal locking network of the satellite signal based on the multi-beam switching mechanism;

[0010] collecting transmission data between the voyage ship and the communication terminal, analyzing the sensitivity of the transmission data, setting a transmission level of the transmission data based on the sensitivity, encrypting the transmission data according to the transmission level to obtain encrypted data, and setting a confidentiality path for the encrypted data;

[0011] In combination with the multi-beam switching mechanism, the signal locking network and the confidential path, communication processing is performed between the long-distance ship and the communication end to obtain a communication result.

[0012] In a second aspect, the present invention provides a communication system for a long-distance ship based on L-band communication, the system comprising:

[0013] A communication demand analysis module, used to obtain a long-distance ship to be communicated with and its corresponding communication terminal, identify the navigation environment of the long-distance ship, wherein the navigation environment includes the navigation stage, geographical conditions, and mission nature, locate the position coordinates of the long-distance ship and the communication terminal, and identify the communication demand of the long-distance ship and the communication terminal based on the navigation environment and the position coordinates, wherein the communication demand includes data transmission volume, communication frequency, and coverage range, and determine the communication frequency band of the long-distance ship according to the communication demand;

[0014] A signal tracking module, used to identify the frequency band characteristics of the communication frequency band, set a signal search device for the long-distance ship and the communication end according to the frequency band characteristics, identify the satellite signal of the long-distance ship and the communication end based on the signal search device, query the ephemeris data between the long-distance ship and the communication end, and set a signal tracking network for the satellite signal according to the ephemeris data;

[0015] a signal quality feedback module, configured to monitor the signal parameters of the satellite signal in real time based on the signal tracking network, set a signal quality feedback mechanism for the signal parameters, extract satellite position data of the satellite signal according to the ephemeris data, identify the pointing beam of the satellite signal based on the satellite position data, analyze the current signal quality of the satellite signal under the pointing beam, and identify the signal quality level of the current signal quality based on the signal quality feedback mechanism;

[0016] A signal locking module, configured to identify the signal quality requirements of the long-distance ship and the communication terminal according to the satellite position and the signal quality level, set a multi-beam switching mechanism of the directional beam based on the signal quality requirement, and set a signal locking network of the satellite signal based on the multi-beam switching mechanism;

[0017] A data encryption module, used to collect the transmission data between the voyage ship and the communication terminal, analyze the sensitivity of the transmission data, set the transmission level of the transmission data based on the sensitivity, encrypt the transmission data according to the transmission level to obtain encrypted data, and set a confidentiality path for the encrypted data;

[0018] The communication result module is used to combine the multi-beam switching mechanism, the signal locking network and the confidential path to perform communication processing between the long-distance ship and the communication end to obtain a communication result.

[0019] Compared with the prior art, the technical principle and beneficial effects of this solution are:

[0020] By identifying the navigation environment of the long-distance ship, the present invention can timely discover and eliminate potential safety hazards to ensure navigation safety, and optimize the navigation route and speed according to the actual situation of the navigation environment to improve navigation efficiency. Based on the navigation environment and the position coordinates, the communication needs of the long-distance ship and the communication terminal are identified, which can ensure that the long-distance ship can communicate efficiently and reliably in various complex navigation environments, thereby ensuring navigation safety and operational efficiency. Furthermore, by identifying the frequency band characteristics of the communication frequency band, the present invention can design an efficient communication system to ensure the communication quality of the long-distance ship, and by setting the signal search device of the long-distance ship and the communication terminal according to the frequency band characteristics, the signal can be quickly scanned and locked according to the frequency range and bandwidth of the frequency band, and the signal search device can be used to identify and avoid interference, thereby improving the reliability of communication, and at the same time, the signal search time can be significantly reduced to improve communication efficiency. By setting the signal quality feedback mechanism of the signal parameters, the present invention can quickly identify the situation of signal quality degradation and timely trigger beam switching, thereby reducing communication interruptions and improving switching efficiency, thereby more reasonably allocating beam resources, improving the overall performance and Spectrum utilization, and based on the signal quality feedback mechanism, the signal quality level of the current signal quality is identified, the quality status of the current signal can be monitored in real time, and measures can be taken in time to troubleshoot according to changes in the signal quality level to ensure the stability of the communication link; further, by setting the multi-beam switching mechanism of the directional beam based on the signal quality requirements, the communication interruption caused by weak signal can be effectively avoided, the continuity of communication can be ensured, and the communication link can be dynamically adjusted according to the signal quality requirements to ensure that the best communication quality is always maintained between the long-distance ship and the communication end, and the signal locking network of the satellite signal is set based on the multi-beam switching mechanism to ensure that the communication link remains stable even under the influence of the movement of the long-distance ship or other interference factors, reducing the risk of communication interruption; the present invention sets the confidentiality path of the encrypted navigation data according to the transmission level, which can ensure that only authorized users can obtain and use the decryption key to decrypt the navigation data, and by recording who has accessed the decryption key, the decryption operation of the specific user on the navigation data can be tracked, so as to effectively manage and control the access rights of the data and ensure the security and integrity of the encrypted navigation data;Finally, the present invention combines the multi-beam switching mechanism, the signal locking network and the confidential path to perform communication processing between the long-distance ship and the communication end to obtain a communication result, which can ensure that the communication signal of the long-distance ship can be stably locked even in a dynamically changing marine environment, thereby improving the accuracy and rate of data transmission. At the same time, the multi-beam switching mechanism can ensure that during the movement of the long-distance ship, the communication link always remains on the beam with the best signal quality, thereby improving the communication quality. Through the setting of the confidential path, the information in the communication process can be prevented from being intercepted or tampered with by unauthorized third parties, thereby ensuring the confidentiality and security of the communication. Therefore, the communication method for long-distance ships based on L-band communication proposed in the present invention can enhance the stability and security of signal transmission and improve the communication quality of long-distance ships. ; BRIEF DESCRIPTION OF THE DRAWINGS

[0021] The accompanying drawings, which are incorporated in and constitute a part of this specification, illustrate embodiments consistent with the invention and, together with the description, serve to explain the principles of the invention.

[0022] Figure 1 A flow chart of a communication method for a long-distance ship based on L-band communication provided by an embodiment of the present invention;

[0023] Figure 2 A module schematic diagram of a communication system for a long-distance ship based on L-band communication provided by one embodiment of the present invention. DETAILED DESCRIPTION

[0024] It should be understood that the specific embodiments described herein are only used to explain the present invention, and are not used to limit the present invention.

[0025] The embodiment of the present invention provides a communication method for a long-distance ship based on L-band communication, and the execution subject of the communication method for a long-distance ship based on L-band communication includes but is not limited to at least one of the electronic devices such as a server and a terminal that can be configured to execute the method provided by the embodiment of the present invention. In other words, the communication method for a long-distance ship based on L-band communication can be executed by software or hardware installed in a terminal device or a server device, and the software can be a blockchain platform. The server includes but is not limited to: a single server, a server cluster, a cloud server or a cloud server cluster, etc. The server can be an independent server, or it can be a cloud server that provides basic cloud computing services such as cloud services, cloud databases, cloud computing, cloud functions, cloud storage, network services, cloud communications, middleware services, domain name services, security services, content distribution networks (ContentDe li very Network, CDN), and big data and artificial intelligence platforms.

[0026] See also Figure 1FIG. 1 is a flow chart of a communication method for a long-distance ship based on L-band communication provided by an embodiment of the present invention. Figure 1 The communication method for a long-distance ship based on L-band communication described in the specification includes:

[0027] S1. Acquire a long-distance ship to be communicated with and its corresponding communication terminal, identify the navigation environment of the long-distance ship, wherein the navigation environment includes the navigation stage, geographical conditions, and mission nature, locate the position coordinates of the long-distance ship and the communication terminal, and based on the navigation environment and the position coordinates, identify the communication requirements of the long-distance ship and the communication terminal, wherein the communication requirements include data transmission volume, communication frequency, and coverage range, and determine the communication frequency band of the long-distance ship according to the communication requirements.

[0028] The embodiment of the present invention can ensure that the communication content can accurately reach the designated receiving end by obtaining the long-distance ship to be communicated and its corresponding communication end. The long-distance ship refers to a ship that is sailing in the ocean, and the communication end refers to a party communicating with the long-distance ship.

[0029] Optionally, the long-distance ship to be communicated with and its corresponding communication terminal may be acquired by using ship-borne equipment and a satellite ground station.

[0030] Furthermore, the embodiments of the present invention can timely discover and eliminate potential safety hazards by identifying the navigation environment of the long-distance ship, ensure navigation safety, and optimize the navigation route and speed according to the actual situation of the navigation environment to improve navigation efficiency. The navigation environment refers to the various external conditions and situations in which the long-distance ship is in during its navigation.

[0031] As an embodiment of the present invention, the identifying of the navigation environment of the long-distance ship includes: collecting the navigation start data of the long-distance ship, and identifying the navigation stage of the long-distance ship according to the navigation start data; locating the geographical location of the long-distance ship based on the navigation stage and the navigation start data, and analyzing the geographical conditions of the geographical location; inquiring about the loading status of the long-distance ship, and analyzing the mission nature of the long-distance ship according to the loading status; identifying the navigation environment of the long-distance ship in combination with the navigation stage, the geographical conditions and the mission nature.

[0032] Among them, the voyage start data refers to a series of basic information and data collected and recorded before the ship sets sail and in the initial stage of the voyage; the voyage stage refers to the different time periods or operation stages experienced by a ship during a voyage; the geographical location refers to the specific location of the ship at a certain moment, usually expressed by longitude and latitude coordinates; the geographical conditions refer to the specific geographical environment of the ship's location, including waterway conditions, water type, climate characteristics, geographical obstacles, etc.; the loading situation refers to the type, quantity, weight, volume and other information of the loads loaded on the ship; the nature of the mission refers to the specific purpose of the ship's voyage, such as freight, passenger transport, scientific research investigation, etc.

[0033] Optionally, the voyage start data collection of the long-distance ship can be obtained through a shipboard computer system, the geographical location positioning of the long-distance ship based on the navigation stage and the voyage start data can be achieved using a GPS receiver, the geographical condition analysis of the geographical location can be obtained through an electronic chart display and information system, and the loading status query of the long-distance ship can be achieved using a cargo management system.

[0034] The embodiment of the present invention can ensure that the communicating parties can communicate accurately and efficiently and support the safe management and operation of the ship by locating the position coordinates of the long-distance ship and the communication terminal, and the position coordinates refer to a set of values ​​used to accurately identify the specific position of the long-distance ship or the communication terminal on the surface of the earth, such as longitude and latitude.

[0035] Optionally, the position coordinates of the voyage vessel and the communication terminal may be located using navigation equipment, such as GPS.

[0036] Furthermore, the embodiments of the present invention can ensure that the long-distance ship can communicate efficiently and reliably in various complex navigation environments to ensure navigation safety and operational efficiency by identifying the communication needs of the long-distance ship and the communication end based on the navigation environment and the position coordinates. The communication needs refer to the communication services and technical requirements required for the long-distance ship to achieve safe, efficient and compliant navigation operations under specific navigation environments and position coordinates.

[0037] As an embodiment of the present invention, the identifying the communication needs of the long-distance ship and the communication end based on the navigation environment and the position coordinates includes: analyzing the target signal coverage range of the long-distance ship and the communication end based on the navigation environment and the position coordinates; setting the communication frequency between the long-distance ship and the communication end based on the target signal coverage range and the navigation environment; extracting the data transmission content between the long-distance ship and the communication end, and identifying the data transmission volume of the data transmission content; identifying the communication needs of the long-distance ship and the communication end in combination with the target signal coverage range, the communication frequency and the data transmission volume.

[0038] Among them, the target signal coverage range refers to the maximum geographical range within which the communication system can effectively transmit signals, the communication frequency refers to the frequency of radio signals used to transmit data, the data transmission content refers to the specific type of data that needs to be transmitted, such as location information, video images, cargo status, etc., and the data transmission volume refers to the total amount of data that needs to be transmitted within a certain period of time.

[0039] Optionally, the target signal coverage analysis between the long-distance ship and the communication terminal based on the navigation environment and the position coordinates can be obtained through a communication testing tool, the communication frequency setting between the long-distance ship and the communication terminal based on the target signal coverage and the navigation environment can be implemented using the specification manual of the communication equipment, and the data transmission volume identification of the data transmission content can be obtained through communication monitoring software, such as Site Modem Software.

[0040] The embodiment of the present invention can monitor the position and status of the ship in real time and ensure that high-definition video images can be smoothly transmitted back to the shore by determining the communication frequency band of the long-distance ship according to the communication needs. The communication frequency band refers to the path or channel, such as cables or radio waves, by which information can be transmitted from one place to another.

[0041] Optionally, according to the communication requirements, the communication frequency band of the long-distance ship can be determined by utilizing L-band satellite communication.

[0042] S2. Identify the frequency band characteristics of the communication frequency band, set a signal search device for the long-distance ship and the communication end according to the frequency band characteristics, identify the satellite signal of the long-distance ship and the communication end based on the signal search device, query the ephemeris data between the long-distance ship and the communication end, and set a signal tracking network for the satellite signal according to the ephemeris data.

[0043] The embodiment of the present invention can design an efficient communication system to ensure the communication quality of long-distance ships by identifying the frequency band characteristics of the communication frequency band. The frequency band characteristics refer to the physical and technical properties of a specific frequency band in communication, such as propagation characteristics and anti-interference capabilities.

[0044] Optionally, the identification of the frequency band characteristics of the communication frequency band may be achieved using a spectrum analyzer, such as a Rohde&Schwarz FSW spectrum analyzer.

[0045] Furthermore, the embodiment of the present invention can quickly scan and lock the signal according to the frequency range and bandwidth of the frequency band by setting the signal search device between the long-distance ship and the communication end according to the characteristics of the frequency band, and use the signal search device to identify and avoid interference, thereby improving the reliability of communication. At the same time, it can significantly reduce the time of signal search and improve communication efficiency. The signal search device refers to a device specifically used to search, identify and lock communication signals within a specific frequency band.

[0046] As an embodiment of the present invention, according to the frequency band characteristics, a signal search device for the long-distance ship and the communication end is set, including: identifying the communication frequency band between the long-distance ship and the communication end according to the frequency band characteristics; setting the signal antenna of the long-distance ship and the communication end based on the communication frequency band; matching the signal processing hardware of the long-distance ship and the communication end according to the frequency band characteristics, and setting the signal processing mechanism of the long-distance ship and the communication end; setting the signal search device of the long-distance ship and the communication end according to the signal antenna, the signal processing hardware and the signal processing mechanism.

[0047] Among them, the signal antenna refers to a device used to transmit and receive radio waves, the signal processing hardware refers to a series of electronic devices used for receiving, amplifying, filtering, down-converting and analog-to-digital conversion, such as a low-noise amplifier, and the signal processing mechanism refers to an algorithmic mechanism used to process digital signals, including signal detection, channel estimation, demodulation, interference suppression, etc.

[0048] Optionally, based on the communication frequency band, the signal antenna setting of the long-distance ship and the communication end can be implemented using antennas with specific polarization modes, such as right-handed or left-handed circularly polarized antennas. According to the frequency band characteristics, the signal processing hardware matching between the long-distance ship and the communication end can be designed to cope with various electromagnetic interference requirements that may exist in the marine environment.

[0049] The embodiment of the present invention can automatically lock the satellite signal and maintain connection with it by identifying the satellite signal between the long-distance ship and the communication end based on the signal search device, thereby ensuring the continuity and stability of communication. The satellite signal refers to a radio signal transmitted via a satellite.

[0050] Optionally, based on the signal search device, the satellite signal recognition between the long-distance ship and the communication terminal can be achieved by utilizing an automatic detection mechanism of the signal search device.

[0051] Furthermore, the embodiment of the present invention can provide accurate position information of the satellite by querying the ephemeris data between the long-distance ship and the communication end. Through the ephemeris data, the signal tracking network can quickly find and lock the satellite signal, and maintain the signal connection even if the satellite position changes. The ephemeris data refers to data that describes the satellite position and motion status, usually including information such as satellite orbit parameters, speed and acceleration.

[0052] Optionally, the ephemeris data query between the long-distance ship and the communication terminal may be obtained through a satellite navigation system, such as a GLONASS system.

[0053] The embodiment of the present invention sets up a signal tracking network for the satellite signal according to the ephemeris data, thereby accurately tracking the satellite position, monitoring the movement status of the satellite in real time, and adjusting the signal tracking strategy in time. The signal tracking network refers to a system for tracking and locking satellite signals.

[0054] As an embodiment of the present invention, a signal tracking network for the satellite signal is set according to the ephemeris data, including: identifying the satellite position of the satellite signal according to the ephemeris data; setting the shipborne antenna pointing of the satellite signal based on the satellite position; performing a signal search for the satellite position according to the shipborne antenna pointing to obtain a search signal; calculating the correlation between the search signal and a preset local signal copy; setting a signal capture mechanism for the satellite signal based on the correlation; setting a signal tracking mode for the satellite signal based on the signal capture mechanism; and setting a signal tracking network for the satellite signal in combination with the signal capture mechanism and the signal tracking mode.

[0055] Among them, the satellite position refers to the exact position of the satellite in the sky calculated based on the ephemeris data, the shipboard antenna pointing refers to the direction in which the satellite communication antenna on a long-distance ship is pointed at the satellite, the search signal refers to the satellite signal received during the signal search process, the local signal copy refers to the signal generated inside the receiver for correlation comparison with the received satellite signal, the correlation refers to the similarity between the received signal and the locally generated signal copy, the signal capture mechanism refers to the mechanism by which the receiver locks the satellite signal once the correlation reaches a certain threshold, and the signal tracking mode refers to the dynamic process mode in which the receiver continues to track the satellite signal after capturing the satellite signal.

[0056] Optionally, according to the ephemeris data, the satellite position identification of the satellite signal can be realized by calculating the Kepler orbit equation, and based on the satellite position, the shipborne antenna pointing setting of the satellite signal can be obtained by determining the azimuth and elevation angles at which the antenna needs to point by spherical trigonometry formulas, and the signal search for the satellite position can be realized by a signal search device, such as a signal receiver, and based on the signal capture mechanism, the signal tracking mode setting of the satellite signal can be realized by tracking loops such as a carrier loop (PLL) and a code loop (DLL).

[0057] In an optional embodiment of the present invention, the correlation between the search signal and the preset local signal copy is calculated using the following formula:

[0058]

[0059] Where R represents the correlation between the search signal and the preset local signal copy, h n represents the nth sample of the search signal, l n represents the nth sample of the local signal copy, n represents the signal index of the search signal and the local signal copy, N represents the total number of signal samples of the search signal and the local signal copy, N-1 represents the last signal index of the search signal and the local signal copy. In discrete signal processing, the sample index usually starts counting from 0, so the index range is usually from 0 to N-1, and n=0 represents the index of the first sample of the search signal and the local signal copy.

[0060] S3. Based on the signal tracking network, the signal parameters of the satellite signal are monitored in real time, a signal quality feedback mechanism of the signal parameters is set, the satellite position data of the satellite signal is extracted according to the ephemeris data, the pointing beam of the satellite signal is identified based on the satellite position data, the current signal quality of the satellite signal under the pointing beam is analyzed, and the signal quality level of the current signal quality is identified based on the signal quality feedback mechanism.

[0061] The embodiments of the present invention can help detect and compensate for error sources such as multipath effects and atmospheric delays of satellite signals by monitoring the signal parameters of the satellite signals in real time based on the signal tracking network, thereby improving the stability and reliability of satellite signals. At the same time, it can timely detect abnormalities or failures of satellite signals and take corresponding measures to repair or adjust them. The signal parameters refer to a series of parameters of signal characteristics and quality, such as signal amplitude, signal phase, and carrier frequency.

[0062] Optionally, the real-time monitoring of the signal parameters of the satellite signal based on the signal tracking network can be achieved using a satellite signal monitoring platform, such as Gilat SkyEdge IIc monitoring platform.

[0063] Furthermore, the embodiment of the present invention can quickly identify the situation of signal quality degradation and trigger beam switching in time by setting the signal quality feedback mechanism of the signal parameters, thereby reducing communication interruptions and improving switching efficiency, thereby more reasonably allocating beam resources and improving the overall performance and spectrum utilization of the system. The signal quality feedback mechanism refers to a system for real-time monitoring and adjustment of signal quality.

[0064] As an embodiment of the present invention, the signal quality feedback mechanism for setting the signal parameters includes: identifying parameter attributes of the signal parameters; monitoring the signal parameters in real time according to the parameter attributes to obtain a monitoring signal; setting a signal quality standard for the monitoring signal, and performing a quality assessment on the monitoring signal according to the signal quality standard to obtain a signal quality assessment result; setting a signal adjustment method for the monitoring signal based on the signal quality assessment result; and setting a signal quality feedback mechanism for the signal parameters in combination with the signal quality assessment result and the signal adjustment method.

[0065] Among them, the parameter attributes refer to the characteristics of signal parameters, such as the amplitude, frequency range, modulation characteristics, etc. of the signal; the monitoring signal refers to the signal monitored in real time during the communication process; the signal quality standard refers to the preset signal quality evaluation standard, such as signal-to-noise ratio (SNR), error vector magnitude (EVM), etc.; the signal quality evaluation result refers to the result of evaluating the monitoring signal according to the signal quality standard; and the signal adjustment method refers to a method of adjusting the signal parameters based on the signal quality evaluation result.

[0066] Optionally, parameter attribute identification of the signal parameter can be obtained through a signal generator, and based on the parameter attributes and the signal quality standard, quality assessment of the monitoring signal can be achieved using a signal quality analysis tool, such as a Matlab Site 1 Communications Tool box, and the signal quality standard setting of the monitoring signal can be obtained through manufacturer specifications.

[0067] The embodiment of the present invention can determine the current position of the satellite by extracting the satellite position data of the satellite signal based on the ephemeris data, thereby identifying the satellite's optimal pointing beam and tracking the satellite position changes in real time. The satellite position data refers to information data that describes the precise position and motion state of the satellite in space.

[0068] Furthermore, the embodiments of the present invention can reduce interference to other satellites or ground communication systems by identifying the directional beam of the satellite signal based on the satellite position data, and avoid signal leakage to non-target areas through precise beam pointing. At the same time, it can track the movement of the ship to ensure the continuity of communication. The directional beam refers to a narrow beam generated by a satellite antenna that can accurately point to a specific service area on the earth.

[0069] As an embodiment of the present invention, the identifying the directional beam of the satellite signal based on the satellite position data includes: identifying the satellite position of the satellite signal based on the satellite position data; performing coordinate conversion on the satellite position to obtain target satellite coordinates; identifying the array antenna of the satellite signal according to the satellite position; calculating the azimuth of the array antenna pointing to the satellite position; determining the elevation angle of the array antenna pointing to the satellite position according to the azimuth; analyzing the signal distribution range of the array antenna based on the azimuth and the elevation angle; and identifying the directional beam of the satellite signal according to the azimuth, the elevation angle and the signal distribution range.

[0070] Among them, the target satellite coordinates refer to the position coordinates of the satellite in a specific coordinate system, the array antenna refers to an antenna system composed of multiple antenna units, the azimuth angle refers to the horizontal angle of the antenna pointing to the satellite, the elevation angle refers to the vertical angle of the antenna pointing to the satellite, and the signal distribution range refers to the signal strength distribution range of the antenna in three-dimensional space.

[0071] Optionally, the coordinate transformation of the satellite position can be implemented using Matlab software. According to the satellite position, the array antenna identification of the satellite signal can be obtained by drawing the antenna pattern using Matlab software. The signal distribution range analysis of the array antenna based on the azimuth angle and the elevation angle can be implemented using the antenna pattern. The elevation angle of the array antenna pointing to the satellite position can be determined by obtaining the inverse tangent function formula of the azimuth angle.

[0072] In an optional embodiment of the present invention, the azimuth angle of the array antenna pointing to the satellite position is calculated using the following formula:

[0073]

[0074] Where A represents the azimuth of the array antenna pointing to the satellite position, G b Indicates the geographic longitude of the satellite position, G c represents the geographical longitude of the array antenna, g c represents the geographical latitude of the array antenna, and b represents the elevation angle of the satellite position.

[0075] The embodiment of the present invention can ensure that the signal is strong enough at the receiving end by analyzing the current signal quality of the satellite signal under the pointing beam, and will not cause communication interruption due to weak signal. By analyzing the signal quality, the azimuth and elevation angles of the antenna can be adjusted in real time to ensure optimal pointing. The signal quality refers to the actual performance of the satellite signal at the receiving end, including indicators such as signal strength, signal-to-noise ratio (SNR), and bit error rate (BER).

[0076] Optionally, the current signal quality analysis of the satellite signal under the pointing beam may be implemented using a Rohde & Schwarz FSW spectrum analyzer.

[0077] Furthermore, the embodiments of the present invention can monitor the quality status of the current signal in real time by identifying the signal quality level of the current signal quality based on the signal quality feedback mechanism, and take timely measures to troubleshoot the fault according to the changes in the signal quality level to ensure the stability of the communication link. The signal quality level refers to the division of the signal quality into different levels, such as excellent, good, fair and poor, according to the difference in signal quality.

[0078] As an embodiment of the present invention, identifying the signal quality level of the current signal quality based on the signal quality feedback mechanism includes: analyzing the signal effect of the current signal quality based on the signal quality feedback mechanism; identifying an evaluation index of the signal effect and setting an evaluation baseline of the evaluation index; setting a hierarchical quality level of the current signal quality according to the evaluation baseline; and identifying the signal quality level of the current signal quality in combination with the evaluation baseline and the hierarchical quality level.

[0079] Among them, the signal effect refers to the actual performance of the current signal, the evaluation index refers to the specific parameters used to evaluate the signal quality, such as signal strength, signal-to-noise ratio, bit error rate, etc., the evaluation baseline refers to the standard value or reference value used to evaluate the signal quality, and the hierarchical quality level refers to the different levels into which the signal quality is divided.

[0080] Optionally, based on the signal quality feedback mechanism, the signal effect analysis of the current signal quality can be implemented by utilizing the historical records of signal quality analysis, and the identification of evaluation indicators of the signal effect can be obtained through relevant communication standards, such as the ITU communication standard. According to the evaluation baseline, the hierarchical quality level setting of the current signal quality can be implemented by utilizing actual measurement results to divide the signal quality into different levels.

[0081] S4. According to the satellite position and the signal quality level, the signal quality requirements of the long-distance ship and the communication end are identified, and based on the signal quality requirements, a multi-beam switching mechanism of the directional beam is set, and based on the multi-beam switching mechanism, a signal locking network of the satellite signal is set.

[0082] The embodiment of the present invention can determine the optimal communication path for the ship by identifying the signal quality requirements of the long-distance ship and the communication end according to the satellite position and the signal quality level, thereby selecting the satellite with the strongest signal for communication to ensure the stability of communication. The signal quality requirement refers to the specific requirements for communication resources and services required by the long-distance ship to meet the communication task with the communication end at a specific time and situation.

[0083] As an embodiment of the present invention, the signal quality requirements of the long-distance ship and the communication end are identified according to the satellite position and the signal quality level, including: identifying the signal coverage range of the long-distance ship and the communication end according to the satellite position; identifying the marine environment of the long-distance ship; based on the signal quality level, performing a signal quality analysis on the marine environment to obtain the marine signal quality; and identifying the signal quality requirements of the long-distance ship and the communication end according to the signal coverage range and the marine signal quality.

[0084] Among them, the signal coverage range refers to the geographical area that the satellite signal can effectively reach, the marine environment refers to the natural conditions and sudden unexpected situations around the long-distance ship, such as wave size, ship failure, etc., and the marine signal quality refers to the quality performance of the communication signal in a specific marine environment.

[0085] Optionally, based on the satellite position, the signal coverage range identification between the long-distance ship and the communication terminal can be calculated through parameters such as satellite transmission power, antenna gain, frequency, etc. The marine environment identification of the long-distance ship can be achieved using the monitoring equipment of the ocean monitoring station, and the signal quality analysis of the marine environment can be obtained through comprehensive analysis of signal quality level and marine environment data.

[0086] Furthermore, the embodiment of the present invention sets a multi-beam switching mechanism of the directional beam based on the signal quality requirement, which can effectively avoid communication interruption caused by weak signal, ensure the continuity of communication, and can dynamically adjust the communication link according to the signal quality requirement to ensure that the best communication quality is always maintained between the long-distance ship and the communication end. The multi-beam switching mechanism refers to a mechanism in which multiple directional beams are used to cover the target area in a communication system, and the optimal beam is dynamically selected for communication according to actual communication needs.

[0087] As an embodiment of the present invention, the multi-beam switching mechanism of the directional beam is set based on the signal quality requirement, including: based on the signal quality requirement, setting the multi-beam point of the directional beam and setting the beam width of the multi-beam point; based on the beam width, real-time monitoring the signal effect of the multi-beam point; according to the signal effect, setting the beam switching threshold of the multi-beam point; based on the beam switching threshold and the signal quality requirement, setting the beam switching trigger condition of the multi-beam point; based on the signal effect, setting the candidate beams of the multi-beam point; and setting the multi-beam switching mechanism of the directional beam in combination with the beam switching trigger condition and the candidate beams.

[0088] Among them, the multi-beam point refers to multiple beams formed in a specific direction, the beam width refers to the width of the beam coverage, which determines the coverage range of the beam, the signal effect refers to the actual performance of the communication signal under a specific beam, including signal strength, signal-to-noise ratio, etc., the beam switching threshold refers to the standard for triggering beam switching, the beam switching trigger condition refers to the specific condition for triggering beam switching, and the candidate beam refers to other beams that can be switched to when the current beam signal quality is poor.

[0089] Optionally, based on the signal quality requirement, the multi-beam point setting of the directional beam can be obtained through a phased array antenna, and the beam width setting of the multi-beam point can be achieved using the layout of the antenna array. Based on the beam width, the real-time monitoring of the signal effect of the multi-beam point can be obtained through a communication device, such as a receiver. According to the signal effect, the beam switching threshold setting of the multi-beam point can be set using the signal quality requirement. Based on the signal effect, the candidate beam setting of the multi-beam point can be obtained by screening out beams with better signal quality as candidate beams through the signal effect.

[0090] The embodiment of the present invention sets up a signal locking network for the satellite signal based on the multi-beam switching mechanism, thereby ensuring that the communication link remains stable even under the influence of the movement of a long-distance ship or other interference factors, thereby reducing the risk of communication interruption. The signal locking network refers to a network structure that ensures that the satellite signal can switch smoothly between multiple beams under the multi-beam switching mechanism and always maintain a stable connection.

[0091] Optionally, the signal locking network setting of the satellite signal based on the multi-beam switching mechanism can be implemented by using a signal locking technology, such as a conical scanning technology.

[0092] S5. Collect the transmission data between the long-distance ship and the communication terminal, analyze the sensitivity of the transmission data, set the transmission level of the transmission data based on the sensitivity, encrypt the transmission data according to the transmission level to obtain encrypted data, and set a confidentiality path for the encrypted data.

[0093] The embodiment of the present invention collects the transmission data between the long-distance ship and the communication terminal and analyzes the sensitivity of the transmission data, so as to clarify the importance level of the data, set encryption verification of the data, and set the transmission order of the data, thereby improving the security and timeliness of data transmission. The sensitivity level refers to the importance of the data and its potential impact on external leakage.

[0094] Optionally, the sensitivity analysis of the transmitted data may be obtained through a risk assessment tool.

[0095] Furthermore, the embodiments of the present invention can ensure that the data is better encrypted and protected during transmission, reduce the risk of data leakage, and ensure that sensitive information is not illegally obtained by setting the transmission level of the transmitted data based on the sensitivity level. The transmission level refers to different transmission priorities and protection levels set according to the sensitivity of the data.

[0096] Optionally, the transmission level setting of the transmission data based on the sensitivity level may be implemented using a weight formula.

[0097] The embodiment of the present invention encrypts the transmission data according to the transmission level to obtain encrypted data, which can ensure that only the recipient with the correct decryption key can read the true content of the navigation data, prevent unauthorized access or eavesdropping on the communication link, and protect the security of sensitive information. The encrypted data refers to the data form in which the original navigation data is converted into data that cannot be read or tampered with by unauthorized third parties through cryptographic technology.

[0098] Optionally, according to the transmission level, the encryption processing of the transmission data can be implemented using an encryption algorithm, such as a symmetric encryption algorithm AES.

[0099] Furthermore, the embodiments of the present invention can ensure that only authorized users can obtain and use the decryption key to decrypt the navigation data by setting the confidentiality path of the encrypted data according to the transmission level, and by recording who has accessed the decryption key, the decryption operation of the navigation data by the specific user can be traced, thereby achieving effective management and control of data access rights and ensuring the security and integrity of the encrypted data. The confidentiality path refers to a mechanism or method used to ensure the security of data transmission in network communications.

[0100] As an embodiment of the present invention, a confidentiality path for the encrypted data is set according to the transmission level, including: setting an access level for the encrypted data according to the transmission level; identifying the identity of the data party of the encrypted data, and setting an identity authentication mechanism for the data party according to the access level; constructing an encryption tunnel for the encrypted data; analyzing the encryption effect of the encrypted data based on the encryption tunnel and the identity authentication mechanism; setting a decryption key for the encrypted data according to the encryption effect; and setting a confidentiality path for the encrypted data in combination with the encryption tunnel, the identity authentication mechanism and the decryption key.

[0101] Among them, the access level refers to the security conditions or levels that need to be met when a user or system component accesses data; the data party identity refers to the identity of the owner or initiator of the data; the identity authentication mechanism refers to the process or tool used to confirm the identity of the user or system entity, and common ones include password authentication, two-factor authentication, biometric authentication, etc.; the encrypted tunnel refers to a technology that provides private communication through a public network. It encapsulates data in encrypted data packets to ensure the security of data during transmission; the encryption effect refers to the effectiveness of the encryption algorithm in protecting data, including encryption strength, key management security, etc.; the decryption key refers to the key used to decrypt encrypted data.

[0102] Optionally, the identity of the data party of the encrypted data can be obtained through login credentials. According to the access level, the identity authentication mechanism setting of the data party can be implemented using an identity authentication server. The encrypted tunnel construction of the encrypted data can be obtained through an encryption protocol, such as the OpenVPN protocol. According to the encryption effect, the decryption key setting of the encrypted data can be implemented using a key exchange protocol.

[0103] S6. Combining the multi-beam switching mechanism, the signal locking network and the confidential path, performing communication processing between the long-distance ship and the communication end to obtain a communication result.

[0104] The embodiment of the present invention combines the multi-beam switching mechanism, the signal locking network and the confidential path to perform communication processing between the long-distance ship and the communication end to obtain a communication result, which can ensure that the communication signal of the long-distance ship can be stably locked even in a dynamically changing marine environment, thereby improving the accuracy and rate of data transmission. At the same time, the multi-beam switching mechanism can ensure that during the movement of the long-distance ship, the communication link always remains on the beam with the best signal quality, thereby improving the communication quality. Through the setting of a confidential path, the information in the communication process can be prevented from being intercepted or tampered with by unauthorized third parties, thereby ensuring the confidentiality and security of the communication. The communication result refers to the effect achieved after information is exchanged between the sending end and the communication end of the long-distance ship in the communication system.

[0105] It can be seen that the present invention can timely discover and eliminate potential safety hazards by identifying the navigation environment of the long-distance ship, ensure navigation safety, and optimize the navigation route and speed according to the actual situation of the navigation environment to improve navigation efficiency. Based on the navigation environment and the position coordinates, the communication needs of the long-distance ship and the communication terminal are identified, which can ensure that the long-distance ship can communicate efficiently and reliably in various complex navigation environments, thereby ensuring navigation safety and operational efficiency; further, the present invention can design an efficient communication system by identifying the frequency band characteristics of the communication frequency band to ensure the communication quality of the long-distance ship, and by setting the signal search device of the long-distance ship and the communication terminal according to the frequency band characteristics, the signal can be quickly scanned and locked according to the frequency range and bandwidth of the frequency band, and the signal search device can be used to identify and avoid interference, thereby improving the reliability of communication, and at the same time, the signal search time can be significantly reduced, thereby improving communication efficiency; the present invention can quickly identify the situation of signal quality degradation by setting the signal quality feedback mechanism of the signal parameters, and timely trigger beam switching, thereby reducing communication interruption and improving switching efficiency, thereby more reasonably allocating beam resources and improving the overall system. Performance and spectrum utilization, and based on the signal quality feedback mechanism, the signal quality level of the current signal quality is identified, the quality status of the current signal can be monitored in real time, and measures can be taken in time to troubleshoot according to changes in the signal quality level to ensure the stability of the communication link; further, by setting the multi-beam switching mechanism of the directional beam based on the signal quality requirements, the communication interruption caused by weak signal can be effectively avoided, the continuity of communication can be ensured, and the communication link can be dynamically adjusted according to the signal quality requirements to ensure that the best communication quality is always maintained between the long-distance ship and the communication end, and the signal locking network of the satellite signal is set based on the multi-beam switching mechanism to ensure that the communication link remains stable even under the influence of the movement of the long-distance ship or other interference factors, reducing the risk of communication interruption; the present invention sets the confidentiality path of the encrypted navigation data according to the transmission level, which can ensure that only authorized users can obtain and use the decryption key to decrypt the navigation data, and by recording who has accessed the decryption key, the decryption operation of the specific user on the navigation data can be tracked, so as to effectively manage and control the access rights of the data and ensure the security and integrity of the encrypted navigation data;Finally, the present invention combines the multi-beam switching mechanism, the signal locking network and the confidential path to perform communication processing between the long-distance ship and the communication end to obtain a communication result, which can ensure that the communication signal of the long-distance ship can be stably locked even in a dynamically changing marine environment, thereby improving the accuracy and rate of data transmission. At the same time, the multi-beam switching mechanism can ensure that during the movement of the long-distance ship, the communication link always remains on the beam with the best signal quality, thereby improving the communication quality. Through the setting of the confidential path, the information in the communication process can be prevented from being intercepted or tampered with by unauthorized third parties, thereby ensuring the confidentiality and security of the communication. Therefore, the communication method for long-distance ships based on L-band communication proposed in the present invention can enhance the stability and security of signal transmission and improve the communication quality of long-distance ships. ;

[0106] like Figure 2 As shown, it is a functional module diagram of a communication system for long-distance ships based on L-band communication according to the present invention.

[0107] The communication system 200 for long-distance ships based on L-band communication of the present invention can be installed in an electronic device. According to the functions implemented, the communication system for long-distance ships based on L-band communication can include a communication demand analysis module 201, a signal tracking module 202, a signal quality feedback module 203, a signal locking module 204, a data encryption module 205, and a communication result module. The module of the present invention can also be referred to as a unit, which refers to a series of computer program segments that can be executed by an electronic device processor and can complete fixed functions, which are stored in the memory of the electronic device.

[0108] In the embodiment of the present invention, the functions of each module / unit are as follows:

[0109] A communication demand analysis module, used to obtain a long-distance ship to be communicated with and its corresponding communication terminal, identify the navigation environment of the long-distance ship, wherein the navigation environment includes the navigation stage, geographical conditions, and mission nature, locate the position coordinates of the long-distance ship and the communication terminal, and identify the communication demand of the long-distance ship and the communication terminal based on the navigation environment and the position coordinates, wherein the communication demand includes data transmission volume, communication frequency, and coverage range, and determine the communication frequency band of the long-distance ship according to the communication demand;

[0110] A signal tracking module, used to identify the frequency band characteristics of the communication frequency band, set a signal search device for the long-distance ship and the communication end according to the frequency band characteristics, identify the satellite signal of the long-distance ship and the communication end based on the signal search device, query the ephemeris data between the long-distance ship and the communication end, and set a signal tracking network for the satellite signal according to the ephemeris data;

[0111] a signal quality feedback module, configured to monitor the signal parameters of the satellite signal in real time based on the signal tracking network, set a signal quality feedback mechanism for the signal parameters, extract satellite position data of the satellite signal according to the ephemeris data, identify the pointing beam of the satellite signal based on the satellite position data, analyze the current signal quality of the satellite signal under the pointing beam, and identify the signal quality level of the current signal quality based on the signal quality feedback mechanism;

[0112] A signal locking module, configured to identify the signal quality requirements of the long-distance ship and the communication terminal according to the satellite position and the signal quality level, set a multi-beam switching mechanism of the directional beam based on the signal quality requirement, and set a signal locking network of the satellite signal based on the multi-beam switching mechanism;

[0113] A data encryption module, used to collect the transmission data between the voyage ship and the communication terminal, analyze the sensitivity of the transmission data, set the transmission level of the transmission data based on the sensitivity, encrypt the transmission data according to the transmission level to obtain encrypted data, and set a confidentiality path for the encrypted data;

[0114] The communication result module is used to combine the multi-beam switching mechanism, the signal locking network and the confidential path to perform communication processing between the long-distance ship and the communication end to obtain a communication result.

[0115] In detail, the modules in the L-band communication-based long-distance ship communication system 200 in the embodiment of the present invention are used in the same manner as described above. Figure 1 The long-distance ship communication method based on L-band communication described in the text uses the same technical means and can produce the same technical effects, which will not be repeated here.

[0116] In addition, each functional module in each embodiment of the present invention may be integrated into one processing unit, each unit may exist physically separately, or two or more units may be integrated into one unit. The above-mentioned integrated unit may be implemented in the form of hardware or in the form of hardware plus software functional modules.

Claims

1. A communication method for a long-distance ship based on L-band communication, characterized in that: The method comprises: Acquire a long-distance ship to be communicated with and its corresponding communication terminal, identify the navigation environment of the long-distance ship, and identify the communication requirements between the long-distance ship and the communication terminal based on the navigation environment and position coordinates; According to the satellite position and the signal quality level, the signal quality requirements of the long-distance ship and the communication end are identified, based on the signal quality requirements, a multi-beam switching mechanism for pointing beams is set, and based on the multi-beam switching mechanism, a signal locking network for satellite signals is set; collecting transmission data between the voyage ship and the communication terminal, analyzing the sensitivity of the transmission data, setting a transmission level of the transmission data based on the sensitivity, encrypting the transmission data according to the transmission level to obtain encrypted data, and setting a confidentiality path for the encrypted data; In combination with the multi-beam switching mechanism, the signal locking network and the confidential path, communication processing is performed between the long-distance ship and the communication end to obtain a communication result.

2. The method according to claim 1, characterized in that Before identifying the signal quality requirements of the long-distance ship and the communication end according to the satellite position and the signal quality level, the method also includes: identifying the frequency band characteristics of the communication frequency band, setting a signal search device for the long-distance ship and the communication end according to the frequency band characteristics, identifying the satellite signal between the long-distance ship and the communication end based on the signal search device, querying the ephemeris data between the long-distance ship and the communication end, and setting a signal tracking network for the satellite signal according to the ephemeris data.

3. The method according to claim 2, characterized in that Based on the signal tracking network, the signal parameters of the satellite signal are monitored in real time, a quality feedback mechanism for the signal parameters is set, the satellite position data of the satellite signal is extracted according to the ephemeris data, the pointing beam of the satellite signal is identified based on the satellite position data, the current signal quality of the satellite signal under the pointing beam is analyzed, and the signal quality level of the current signal quality is identified based on the quality feedback mechanism.

4. The method according to claim 1, characterized in that: in, The navigation environment includes the navigation stage, geographical conditions, and mission nature, and locates the position coordinates of the long-distance ship and the communication terminal. The communication requirements include data transmission volume, communication frequency, and coverage range. The communication frequency band of the long-distance ship is determined based on the communication requirements.

5. The method according to claim 2, characterized in that: The identifying the navigation environment of the long-distance ship comprises: collecting the voyage start data of the long-distance ship, and identifying the voyage stage of the long-distance ship according to the voyage start data; Based on the navigation stage and the navigation start data, locate the geographical location of the voyage vessel, and analyze the geographical conditions of the geographical location; Querying the loading status of the long-distance ship, and analyzing the mission nature of the long-distance ship based on the loading status; The navigation environment of the long-distance vessel is identified by combining the navigation stage, the geographical conditions and the nature of the mission.

6. The method according to claim 2, characterized in that According to the frequency band characteristics, a signal search device for the long-distance ship and the communication end is set, including: According to the frequency band characteristics, identifying the communication frequency band between the long-distance ship and the communication terminal; Based on the communication frequency band, setting a signal antenna between the long-distance ship and the communication end; According to the frequency band characteristics, matching the signal processing hardware of the long-distance ship and the communication end, and setting the signal processing mechanism of the long-distance ship and the communication end; According to the signal antenna, the signal processing hardware and the signal processing mechanism, a signal search device for the long-distance ship and the communication end is set.

7. The method according to claim 2, characterized in that Setting a signal tracking network for the satellite signal according to the ephemeris data includes: identifying the satellite position of the satellite signal according to the ephemeris data; Based on the satellite position, setting the onboard antenna pointing direction of the satellite signal; Performing a signal search on the satellite position according to the direction of the shipborne antenna to obtain a search signal; Calculating a correlation between the search signal and a preset local signal copy; Based on the correlation, setting a signal acquisition mechanism for the satellite signal; Based on the signal acquisition mechanism, setting a signal tracking mode of the satellite signal; In combination with the signal acquisition mechanism and the signal tracking mode, a signal tracking network for the satellite signal is set up.

8. The method according to claim 2, characterized in that: The quality feedback mechanism of setting the signal parameters includes: identifying parameter attributes of the signal parameters; According to the parameter attributes, the signal parameters are monitored in real time to obtain a monitoring signal; Setting a signal quality standard for the monitoring signal, and performing a quality assessment on the monitoring signal according to the signal quality standard to obtain a signal quality assessment result; Based on the signal quality evaluation result, setting a signal adjustment mode of the monitoring signal; In combination with the signal quality evaluation result and the signal adjustment method, a quality feedback mechanism of the signal parameter is set.

9. The method according to claim 2, characterized in that: The step of identifying the directional beam of the satellite signal based on the satellite position data comprises: identifying a satellite position of the satellite signal based on the satellite position data; Performing coordinate conversion on the satellite position to obtain the target satellite coordinates; According to the satellite position, identifying the array antenna of the satellite signal; Calculating the azimuth angle of the array antenna pointing to the satellite position; Determining the elevation angle of the array antenna pointing to the satellite position according to the azimuth angle; Analyzing the signal distribution range of the array antenna based on the azimuth angle and the elevation angle; The directional beam of the satellite signal is identified according to the azimuth angle, the elevation angle and the signal distribution range.

10. A communication system for long-distance ships based on L-band communication, the system implementing the method according to claim 1, characterized in that: The system comprises: A communication demand analysis module, used to obtain a long-distance ship to be communicated with and its corresponding communication terminal, identify the navigation environment of the long-distance ship, wherein the navigation environment includes the navigation stage, geographical conditions, and mission nature, locate the position coordinates of the long-distance ship and the communication terminal, and identify the communication demand of the long-distance ship and the communication terminal based on the navigation environment and the position coordinates, wherein the communication demand includes data transmission volume, communication frequency, and coverage range, and determine the communication frequency band of the long-distance ship according to the communication demand; A signal locking module, configured to identify the signal quality requirements of the long-distance ship and the communication terminal according to the satellite position and the signal quality level, set a multi-beam switching mechanism of the directional beam based on the signal quality requirement, and set a signal locking network of the satellite signal based on the multi-beam switching mechanism; A data encryption module, used to collect the transmission data between the voyage ship and the communication terminal, analyze the sensitivity of the transmission data, set the transmission level of the transmission data based on the sensitivity, encrypt the transmission data according to the transmission level to obtain encrypted data, and set a confidentiality path for the encrypted data; The communication result module is used to combine the multi-beam switching mechanism, the signal locking network and the confidential path to perform communication processing between the long-distance ship and the communication end to obtain a communication result.

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