Ocean ship communication method and system based on Ku wave band communication

Abstract

The invention relates to the technical field of ship communication, and provides an ocean ship communication method and system based on Ku wave band communication. Comprising the following steps: S1, configuring and deploying a Ku wave band satellite; s2, adjusting the corresponding transmitting frequency through the frequency offset of the transmitting end and the receiving end to perform frequency pre-compensation, converting the transmitted communication data into a satellite signal through modulation and coding by the transmitting end, and transmitting the satellite signal to the receiving end; and S3, capturing and performing down-conversion processing on satellite signals through a satellite antenna and a tuner, analyzing frequency and phase change characteristics of the satellite signals, adjusting parameters of a signal processor for compensation, demodulating and decoding the processed satellite signals through a modem, recovering original communication data, and performing Ku wave band satellite communication through a Ku wave band satellite communication technology. Non-blind area communication coverage of ocean ships is realized, and signal attenuation and interference are reduced by configuring a relay station, expanding the signal receiving and sending range, and dynamically adjusting the signal frequency through adaptive frequency control and a Doppler effect compensation algorithm.

Description

Technical Field

[0001] The present invention relates to the technical field of ship communications, and in particular to a marine ship communication method and system based on Ku-band communication. Background Art

[0002] With the acceleration of globalization and the increase in maritime traffic, the density and scope of maritime ship traffic are also increasing. Therefore, ship communication systems have become particularly important. They are not only related to the safe navigation of ships, but also directly affect the efficiency of cargo transportation and the ability to respond to emergencies. Traditional marine communication technology mainly relies on short-wave or ultra-short-wave radio. Although it is stable in offshore areas, it has obvious limitations in ocean voyages, such as:

[0003] (1) Communication blind spot problem: shortwave or ultra-shortwave signals rely on reflection and propagation from terrain and the atmosphere, resulting in communication blind spots in the open ocean and in areas with harsh geography or climate.

[0004] (2) Signal stability and reliability. Severe weather conditions, such as storms and high waves, can seriously affect the stability and reliability of traditional communication signals.

[0005] (3) Bandwidth limitation: Traditional shortwave or ultra-shortwave systems have low bandwidth and cannot support the needs of modern marine vessels for high-speed data transmission and real-time communication, especially when conducting video communication and large data transmission. Summary of the invention

[0006] The purpose of the present invention is to solve the above technical problems and provide a marine ship communication method and system based on Ku-band communication, aiming to solve the communication blind area problem, signal stability and reliability problem and bandwidth limitation problem existing in the existing shortwave or ultra-shortwave communication. The purpose of the present invention can be achieved by the following technical solutions:

[0007] The present invention provides a marine ship communication method based on Ku-band communication, comprising the following steps:

[0008] Step S1, configure and deploy Ku-band satellites so that the Ku-band network fully covers the corresponding ocean area, and establish a communication station on the ship. The communication station is equipped with communication equipment including satellite antennas, high-frequency heads and modems for sending and receiving Ku-band satellite signals;

[0009] Step S2: predicting the frequency offset by the relative speed and direction change of the ships at the transmitting end and the receiving end, adjusting the corresponding transmitting frequency based on the frequency offset to perform frequency pre-compensation, the transmitting end converts the communication data to be sent into a satellite signal by modulation and encoding, and sends it to the satellite through the satellite antenna of the transmitting end, and the satellite sends the satellite signal to the receiving end according to a preset forwarding rule;

[0010] Step S3: The receiving end captures and down-converts the satellite signal through the satellite antenna and the high-frequency head, and converts the satellite signal into a usable frequency range. The monitoring module in the receiving end monitors and analyzes the frequency and phase change characteristics of the satellite signal in real time, and adjusts the parameters in the signal processor based on the change characteristics for compensation until it is consistent with the originally transmitted satellite signal. The modem demodulates and decodes the processed satellite signal to restore the original communication data.

[0011] Furthermore, in step S1, the communication station is also equipped with a backup communication channel and an antenna shield for communication stability under extreme weather conditions.

[0012] Further, in step S2, the frequency offset is predicted by the relative speed and direction change of the ship at the transmitting end and the receiving end, and the corresponding transmission frequency is adjusted based on the frequency offset to perform frequency pre-compensation, specifically,

[0013] Obtain the motion parameters of the sending and receiving ships, including real-time position, speed and direction data;

[0014] Based on the action parameters and propagation path calculation, the predicted frequency offset is calculated and the transmission frequency is dynamically adjusted for compensation to ensure synchronization with the receiving frequency of the receiving end; at the same time, the transmission power is dynamically adjusted according to the current environmental conditions and signal strength monitoring results.

[0015] Furthermore, according to the current environmental conditions and the signal strength monitoring results, the transmission power is dynamically adjusted, specifically,

[0016] Real-time monitoring of basic parameters of current signal strength, including acquisition of current signal power, amplitude and signal-to-noise ratio;

[0017] Based on the monitored basic parameters and environmental conditions, including rain attenuation, the signal strength is compared with the preset reference value. When the signal strength is lower than the reference value, signal compensation is performed and the transmission power is adjusted.

[0018] Furthermore, in step S2, it also includes:

[0019] When the coverage distance of the satellite signal exceeds the distance of direct satellite transmission capability or faces specified geographical conditions, the satellite signal is sent to the satellite relay station on the ground. The satellite relay station receives and enhances the satellite signal and then forwards it to the receiving end.

[0020] Furthermore, the satellite signal is sent to a satellite relay station on the ground, which receives and enhances the satellite signal and then forwards it to the receiving end. Specifically,

[0021] Deploy satellite relay stations and equip them with communications equipment;

[0022] The satellite relay station receives satellite signals through communication equipment and enhances the signals through signal enhancers; at the same time, it performs error correction, filtering and optimization processing on the enhanced satellite signals;

[0023] The processed satellite signal is modulated and encoded, and the satellite relay station determines the signal transmission path according to the position of the designated ship end and the signal reception conditions; the signal transmission path includes sending directly to the receiving end, or forwarding in multiple stages through at least one satellite relay station or satellite.

[0024] Further, step S3 is specifically,

[0025] Receive satellite signals through satellite antennas and perform down-conversion processing through high-frequency heads to convert satellite signals into a usable frequency range;

[0026] The signal booster and filter amplify and filter the satellite signal after preliminary processing;

[0027] According to the communication requirements and conditions, select the corresponding debugging mode, including QPSK and 8PSK, to improve the transmission rate and spectrum efficiency, and perform redundant encoding on satellite signals to correct transmission errors;

[0028] The modulated satellite signal is demodulated and decoded through a modem to restore the original communication data.

[0029] Further, in step S3, the monitoring module in the receiving end monitors and analyzes the frequency and phase change characteristics of the satellite signal in real time, and adjusts the parameters in the signal processor to compensate based on the change characteristics until it is consistent with the originally transmitted satellite signal, specifically,

[0030] The detection module monitors the frequency offset and phase change of satellite signals in real time;

[0031] Adjust parameters within the signal processor including filter settings and signal sampling rates, perform frequency compensation, and perform frequency correction;

[0032] The phase comparator compares the phase of the input satellite signal with the phase of the preset reference signal, and the phase difference signal obtained by the loop filter adjusts the output of the VCO so that the frequency and phase of the satellite signal accurately match the original transmitted satellite signal.

[0033] Furthermore, it also includes step S4, using TCP / IP network protocol to ensure the reliability of data transmission, applying congestion control mechanism to prevent network overload, and using encryption and authentication to protect data security to prevent unauthorized access.

[0034] Based on the same inventive concept, the present invention also provides a marine ship communication system based on Ku-band communication, using the marine ship communication method as described above, comprising:

[0035] The satellite network control module includes a satellite configuration unit, a ship communication station construction unit and a satellite relay station deployment unit. The satellite configuration unit is used for satellite layout planning and orbit adjustment to ensure the coverage of the satellite system; the ship communication station construction unit is used to set up a communication station on the ship, install and debug communication equipment, including satellite antennas, high-frequency heads and modems, for receiving and transmitting satellite signals; the satellite relay station deployment unit is used to deploy relay stations at ground stations or designated locations for receiving, enhancing and forwarding satellite signals;

[0036] A signal processing module includes a signal sending unit and a signal receiving unit, wherein the signal sending unit predicts the frequency offset through the relative speed and direction changes of the ships at the sending end and the receiving end, and adjusts the corresponding transmission frequency based on the frequency offset to perform frequency pre-compensation, and the transmitting end converts the communication data to be sent into a satellite signal through modulation and encoding, and sends it to the satellite through the satellite antenna of the transmitting end, and the satellite sends the satellite signal to the receiving end according to a preset forwarding rule; the signal receiving unit captures and down-converts the satellite signal through the satellite antenna and the high-frequency head, and converts the satellite signal into an available frequency range, wherein the monitoring module in the receiving end monitors and analyzes the frequency and phase change characteristics of the satellite signal in real time, and adjusts the parameters in the signal processor based on the change characteristics to compensate until it is consistent with the originally transmitted satellite signal, and the modem demodulates and decodes the processed satellite signal to restore the original communication data;

[0037] The network management and security module uses TCP / IP network protocol for data transmission, and applies congestion control mechanism to prevent network overload. It also uses encryption and authentication to protect data security and prevent unauthorized access.

[0038] Compared with the prior art, the present invention has at least one of the following technical effects:

[0039] The present invention realizes blind-zone-free communication coverage of marine vessels worldwide through Ku-band satellite communication technology. By configuring high-performance Ku-band satellite transponders and relay stations, the signal reception and transmission range is expanded, ensuring effective communication in a vast sea area. At the same time, adaptive frequency control and Doppler effect compensation algorithms dynamically adjust the signal frequency to cope with the frequency offset caused by ship movement, significantly improving the signal accuracy and demodulation efficiency, not only improving the signal stability, but also reducing the signal attenuation and interference caused by traditional methods. Finally, the high bandwidth of the Ku band allows large-scale data transmission and real-time high-definition video communication, which greatly meets the high requirements of modern marine vessels for data processing and communication rates in ocean operations. This high-bandwidth application effectively solves the bandwidth bottleneck problem of traditional communication technology when processing large amounts of data. BRIEF DESCRIPTION OF THE DRAWINGS

[0040] In order to more clearly illustrate the technical solution of the embodiment of the present invention, the following is a brief introduction to the drawings required for describing the embodiment:

[0041] Figure 1 The present invention is a flow chart of the steps of the marine vessel communication method based on Ku-band communication;

[0042] Figure 2 This is the Ku-band coverage diagram of Example 1 of the present invention;

[0043] Figure 3 The present invention is a communication system diagram of a marine vessel communication system based on Ku-band communication. DETAILED DESCRIPTION

[0044] In order to make the purpose, technical solution and advantages of the present invention more clearly understood, the present invention is further described in detail below in conjunction with the accompanying drawings and specific implementation methods. It should be understood that the specific implementation methods described herein are only used to explain the present invention and are not used to limit the present invention.

[0045] Example 1

[0046] Current marine ship communication technologies mainly rely on traditional shortwave or ultra-shortwave communication systems. Although these systems meet basic communication needs to a certain extent, they have obvious communication blind spots in the open ocean and in some areas with harsh geography and climate. In addition, the signal stability and reliability of these traditional communication methods are easily affected in severe weather conditions, and the bandwidth is significantly limited, making it difficult to support high-speed data transmission and real-time video communication, especially in modern marine operations with high data demands.

[0047] In view of this, we consider using Ku-band satellite communication technology, which can provide global coverage without blind spots and has high bandwidth, suitable for high-speed data transmission. However, the main limitations and challenges faced by Ku-band communication technology include signal attenuation in rain (rain attenuation) and the Doppler effect caused by ship movement, which will affect the stability and reliability of communication.

[0048] In order to solve these problems, this embodiment proposes a marine ship communication method based on Ku-band communication. By introducing a high-performance signal enhancer and an adaptive power control strategy, the impact of rain attenuation is effectively reduced. At the same time, an advanced Doppler compensation algorithm is used to dynamically adjust the signal frequency to adapt to the frequency changes caused by the movement of the ship to ensure the stable transmission of the communication signal. In addition, the system also includes enhanced signal processing and routing selection technology to ensure the optimal transmission path of the signal in a complex marine environment, thereby improving the overall communication quality and system reliability. The specific implementation methods are as follows:

[0049] The present invention provides a marine ship communication method based on Ku-band communication, comprising the following steps:

[0050] Step S1, configure and deploy Ku-band satellites so that the Ku-band network fully covers the corresponding ocean area, and establish a communication station on the ship. The communication station is equipped with communication equipment including satellite antennas, high-frequency heads and modems for sending and receiving Ku-band satellite signals;

[0051] Among them, according to the type of ship and its scheduled navigation area, the corresponding Ku-band satellite resources are selected to ensure communication coverage without blind spots. Figure 1 As shown in the figure, in order to cover a wide ocean area, two key satellites are deployed: APSTAR-6D at position 134E and APSTAR-9 at position 142E. The APSTAR-9 at position 142E is equipped with 14 Ku-band transponders. This configuration optimizes the signal quality and transmission efficiency while enhancing the signal coverage.

[0052] The communication station is also equipped with backup communication channels and antenna shields for stable communication under extreme weather conditions, that is, the satellite antennas of all ship communication stations are equipped with specially designed shields. It effectively prevents physical and electronic damage caused by direct exposure to severe weather conditions, such as mechanical damage caused by strong winds or signal attenuation caused by water accumulation. At the same time, in the case of high demand for critical communications, backup communication channels are designed to ensure that communications can be maintained when Ku-band satellite signals are blocked.

[0053] For Ku-band, rain attenuation is a more serious problem than other lower frequency bands, mainly due to the physical characteristics of Ku-band. The frequency range of Ku-band is approximately 12 to 18 GHz, and high-frequency bands are more susceptible to weather factors, especially precipitation. When water molecules such as raindrops encounter these high-frequency signals, they absorb and scatter the signal energy, resulting in a decrease in the strength of the transmitted signal. This phenomenon is called rain attenuation. Since the size of raindrops is similar to the wavelength of the Ku-band, the Ku-band is particularly sensitive to rainfall.

[0054] Therefore, in low frequency bands such as L-band or C-band, this attenuation phenomenon is less, because their wavelengths are much larger than the size of raindrops, and thus can better penetrate rainfall. However, Ku-band is more affected by rain attenuation due to its higher frequency and short wavelength, which is more closely matched to the size of raindrops.

[0055] To overcome this problem, dynamic power adjustment and high-gain antenna technology are used in step S2. Dynamic power adjustment can automatically adjust the transmission power according to real-time weather conditions to compensate for signal loss caused by rain attenuation. High-gain antennas enhance the signal reception and transmission capabilities, improve the signal directionality, and reduce the loss of signal energy during propagation. In step S3, advanced signal processing technologies such as adaptive channel equalization and error correction coding are used to further enhance the signal processing capability of the receiving end. Adaptive channel equalization can adjust the signal processing parameters according to the received signal conditions to optimize the signal quality, while error correction coding increases the redundancy of the signal, and the original data can be restored even if part of the signal is damaged. These measures together ensure that the stability and reliability of communication can be maintained even in severe weather conditions.

[0056] The Doppler shift prediction algorithm, i.e., the frequency shift calculation algorithm, is as follows: the ship's motion data is used as input, and the propagation characteristics of satellite signals and the influence of the Doppler effect are considered, and a mathematical model and statistical method are established to predict the Doppler shift. The algorithm steps are as follows:

[0057] 1. Signal acquisition and preprocessing

[0058] Use highly sensitive receiving equipment to collect communication signals between moving objects and signal sources.

[0059] Preprocess the collected signals, including filtering and denoising, to improve signal quality

[0060] 2. Motion State Estimation

[0061] Use GPS, inertial navigation systems and other equipment to obtain real-time location, speed and direction information of moving objects, and combine map data and historical movement trajectories to predict the future movement state of moving objects.

[0062] 3. Doppler shift calculation

[0063] According to the Doppler effect formula, the size and direction of the Doppler frequency shift are calculated by combining the motion state of the moving object and the wavelength of the signal. The calculation results are corrected by considering factors such as the propagation path of the signal and the multipath effect.

[0064] 4. Offset compensation and signal recovery

[0065] According to the calculated Doppler frequency shift, the received signal is compensated for frequency deviation to restore the original frequency of the signal, and the compensated signal is further processed, such as demodulation and decoding, to extract useful information.

[0066] Therefore, steps S2 and S3 based on the Doppler shift prediction algorithm are as follows:

[0067] Step S2: predicting the frequency offset by the relative speed and direction change of the ships at the transmitting end and the receiving end, adjusting the corresponding transmitting frequency based on the frequency offset to perform frequency pre-compensation, the transmitting end converts the communication data to be sent into a satellite signal by modulation and encoding, and sends it to the satellite through the satellite antenna of the transmitting end, and the satellite sends the satellite signal to the receiving end according to a preset forwarding rule;

[0068] In step S2, the frequency offset is predicted by the relative speed and direction change of the ship at the transmitting end and the receiving end, and the corresponding transmission frequency is adjusted based on the frequency offset to perform frequency pre-compensation, specifically,

[0069] Obtain the motion parameters of the sending and receiving ships, including real-time position, speed and direction data;

[0070] Based on the action parameters and propagation path calculation, the predicted frequency offset is calculated and the transmission frequency is dynamically adjusted for compensation to ensure synchronization with the receiving frequency of the receiving end; at the same time, the transmission power is dynamically adjusted according to the current environmental conditions and signal strength monitoring results.

[0071] Specifically, the ship's speed is measured by using an inertial measurement unit (IMU) or Doppler radar technology, the ship's direction is determined by direction sensors such as gyroscopes or compasses, and changes in the ocean environment are monitored by pressure sensors and temperature sensors.

[0072] The filtering algorithm removes noise and interference, improves the quality of the signal, analyzes the frequency characteristics of the signal, detects frequency offset, and calculates and adjusts the frequency of the signal in real time based on sensor data and the Doppler effect model to achieve accurate compensation. By combining high-precision sensors and advanced signal processing algorithms, the system can more accurately monitor the status of the ship and environmental factors, and make corresponding frequency adjustments in a timely manner. This can effectively offset the impact of the Doppler effect and ensure accurate demodulation of satellite signals, thereby improving the stability and reliability of communications.

[0073] Furthermore, according to the current environmental conditions and the signal strength monitoring results, the transmission power is dynamically adjusted, specifically,

[0074] Real-time monitoring of basic parameters of current signal strength, including acquisition of current signal power, amplitude and signal-to-noise ratio;

[0075] Based on the monitored basic parameters and environmental conditions, including rain attenuation, the signal strength is compared with the preset reference value. When the signal strength is lower than the reference value, signal compensation is performed and the transmission power is adjusted.

[0076] Therefore, in response to the rain attenuation problem of Ku-band satellites in ocean communications, a number of measures have been taken to ensure the stability and reliability of communications:

[0077] (1) Designing and using antennas with higher gain can enhance the reception of satellite signals. High-gain antennas can focus on receiving signals and improve the signal-to-noise ratio, reducing the interference of rain attenuation on communications. In addition, the directivity and polarization characteristics of the antenna can also be optimized according to specific circumstances to improve the penetration and coverage of the signal.

[0078] (2) Automatically adjust the transmit power by monitoring the rain attenuation and communication quality in the environment in real time. This dynamic adjustment is based on key indicators such as signal strength and bit error rate, and aims to optimize signal transmission effects, ensuring good communication quality even in adverse weather conditions, while improving overall power efficiency and system life.

[0079] Specifically, the rain attenuation degree and communication quality can be detected based on signal strength detection:

[0080] The wireless signal is collected using a radio receiver and antenna whose sensor sensitivity and frequency range match the detection signal;

[0081] The collected signal is filtered to remove interference and noise to improve the purity and reliability of the signal. At the same time, the signal is amplified or attenuated to better measure the signal strength.

[0082] The power, amplitude and signal-to-noise ratio (SNR) of the measured signal can be used to quantitatively evaluate the strength of the signal. The power can be measured by a power meter, the amplitude can be observed by an oscilloscope and other equipment, and the SNR can be determined by calculating the ratio of the signal to the signal-to-noise ratio to reflect the quality and reliability of the signal.

[0083] Measure the signal strength under ideal conditions (such as no rain fade) to establish a reference signal or benchmark. The reference signal serves as a standard for comparison to help determine the difference between the current signal strength and normal conditions.

[0084] Through statistical methods, trend analysis and threshold comparison technology, the measured signal strength data is processed and analyzed, the changing trend of signal strength is observed, statistical indicators such as mean and variance are calculated, and thresholds are set to determine whether rain attenuation has occurred, and further determine the degree and impact of rain attenuation.

[0085] The monitoring results of signal strength are fed back to the system in real time, and the system makes corresponding adjustments and optimizations in a timely manner based on the feedback. At the same time, in order to ensure the accuracy of the measurement, it is necessary to regularly use standard signal sources or reference equipment to calibrate and correct the signal strength detection equipment to verify its measurement precision and accuracy, and adjust the parameters and correction coefficients of the equipment.

[0086] Therefore, the signal strength detection function is integrated into the entire communication system and works in conjunction with other modules (such as transmit power control, modulation and demodulation, etc.). Through system-level optimization, the transmit power is dynamically adjusted according to the real-time monitored signal strength information to maintain good communication quality. The signal strength data is recorded for a long time, and further analysis and trend research are carried out to find the change pattern and law of signal strength, reveal the relationship between rain attenuation and other environmental factors, and provide a basis for system improvement and optimization.

[0087] (3) Selecting the right frequency: In Ku-band satellite communications, some frequencies have relatively low attenuation in rain. By selecting these frequencies with low attenuation for communication, the impact of rain attenuation on the signal can be reduced. In practical applications, factors such as available frequency resources, the presence of other interference elements, and equipment compatibility should be considered comprehensively to ensure that the selected frequency can effectively reduce the impact of rain attenuation and improve reliable communication connections.

[0088] (4) Use signal enhancement technology: Use signal amplifiers, low noise amplifiers and other equipment to increase the strength of the signal, thereby compensating for the signal loss caused by rain attenuation. These signal enhancement technologies can improve the reception quality and stability of the signal without increasing the transmission power, ensuring the reliability of communication. At the same time, they can also reduce signal interference and noise effects, improving overall communication performance. It should be noted that when using signal enhancement technology, it is necessary to select appropriate equipment and parameters according to the specific situation to achieve the best enhancement effect.

[0089] Furthermore, in step S2, it also includes:

[0090] When the coverage distance of the satellite signal exceeds the distance of direct satellite transmission capability or faces specified geographical conditions, the satellite signal is sent to the satellite relay station on the ground. The satellite relay station receives and enhances the satellite signal and then forwards it to the receiving end.

[0091] Furthermore, the satellite signal is sent to a satellite relay station on the ground, which receives and enhances the satellite signal and then forwards it to the receiving end. Specifically,

[0092] Deploy satellite relay stations and equip them with communications equipment;

[0093] The satellite relay station receives satellite signals through communication equipment and enhances the signals through signal enhancers; at the same time, it performs error correction, filtering and optimization processing on the enhanced satellite signals;

[0094] The processed satellite signal is modulated and encoded, and the satellite relay station determines the signal transmission path according to the position of the designated ship end and the signal reception conditions; the signal transmission path includes sending directly to the receiving end, or forwarding in multiple stages through at least one satellite relay station or satellite.

[0095] Specifically, when the satellite coverage is limited, some oceans cannot provide stable communications. To solve this problem, multiple satellites or satellite constellations can be used, as well as technologies such as satellite relays to extend the range:

[0096] Satellite relay stations are deployed at suitable locations on the earth, such as islands, offshore platforms or coastal areas. The relay stations have the ability to receive satellite signals, amplify them and retransmit them, thereby extending the transmission distance of the signals.

[0097] Satellites exchange information and work together through communication links, share loads and resources, and use inter-satellite link technology to achieve data transmission and signal relay between satellites, thereby improving the reliability of the entire system.

[0098] Design reasonable signal processing algorithms to enhance, correct errors and route satellite signals. Intelligently select the best signal transmission path based on user needs and satellite coverage to improve signal quality and range.

[0099] Reasonably plan the frequency bands used by satellites to avoid interference with other satellites or ground communication systems, adopt interference suppression technology to reduce the impact of signal interference on communications, and improve the system's anti-interference ability

[0100] Use highly adaptable ground receiving equipment to stably receive signals under different satellite signal strengths and multipath environments, and improve the receiving performance and range of ground equipment.

[0101] Establish a satellite system monitoring and management platform to monitor satellite status, signal quality and coverage in real time. Make dynamic adjustments and optimizations based on monitoring data to ensure the normal operation of the system and maximize coverage.

[0102] Step S3: The receiving end captures and down-converts the satellite signal through the satellite antenna and the high-frequency head, and converts the satellite signal into a usable frequency range. The monitoring module in the receiving end monitors and analyzes the frequency and phase change characteristics of the satellite signal in real time, and adjusts the parameters in the signal processor based on the change characteristics for compensation until it is consistent with the originally transmitted satellite signal. The modem demodulates and decodes the processed satellite signal to restore the original communication data.

[0103] Among them, step S3 mainly receives satellite signals through a high-gain, low-noise Ku-band antenna and converts the signals into digital data through a suitable demodulation algorithm, specifically,

[0104] Receive satellite signals through satellite antennas and perform down-conversion processing through high-frequency heads to convert satellite signals into a usable frequency range;

[0105] The signal booster and filter amplify and filter the satellite signal after preliminary processing, that is, the signal booster and filter are used to amplify and filter the received signal, remove interference and noise, and improve signal quality;

[0106] According to the communication requirements and conditions, select the corresponding debugging mode, including QPSK and 8PSK, to improve the transmission rate and spectrum efficiency. At the same time, redundancy encoding is performed on the satellite signal to correct the transmission error, that is, through error correction coding such as Reed-Sol omon coding, the data is redundantly encoded to improve the reliability and anti-interference ability of the data;

[0107] The modulated satellite signal is demodulated and decoded through the modem to restore the original communication data.

[0108] Further, in step S3, the monitoring module in the receiving end monitors and analyzes the frequency and phase change characteristics of the satellite signal in real time, and adjusts the parameters in the signal processor to compensate based on the change characteristics until it is consistent with the originally transmitted satellite signal, specifically,

[0109] The detection module monitors the frequency offset and phase change of satellite signals in real time;

[0110] Adjust parameters within the signal processor including filter settings and signal sampling rates, perform frequency compensation, and perform frequency correction;

[0111] Specifically, the frequency characteristics of the input signal, such as frequency offset and phase change, are monitored. The monitored signal is analyzed to determine the magnitude and direction of the frequency offset. According to the results of the algorithm calculation, the filter parameters are adjusted, the sampling rate of the signal is changed, or frequency compensation is performed. Through the feedback mechanism, the system continuously optimizes the correction effect to adapt to the dynamically changing Doppler effect.

[0112] The phase comparator compares the phase of the input satellite signal with the phase of the preset reference signal, and the phase difference signal obtained by the loop filter adjusts the output of the VCO so that the frequency and phase of the satellite signal accurately match the original transmitted satellite signal.

[0113] Specifically, the phase of the input signal is compared with the phase of the participating signal through a phase comparator, and the comparison result is filtered and processed by a loop filter to remove noise and interference. According to the filtered phase difference signal, the VCO adjusts the frequency of the output signal, and the PLL detects whether the lock state is reached. The frequency and phase of the output signal match the reference signal. The PLL uses an adaptive algorithm to adjust the filter parameters or the control signal of the VCO to adapt to changes in the Doppler effect.

[0114] Furthermore, the method further includes step S4, using the TCP / IP network protocol to ensure the reliability of data transmission, applying a congestion control mechanism to prevent network overload, and using encryption and authentication to protect data security to prevent unauthorized access, specifically including:

[0115] Data compression and optimization, using compression algorithms to reduce the amount of data that needs to be transmitted, helps transmit more information under limited bandwidth conditions and reduces transmission delays. At the same time, through data sorting and grouping, the structure and format of the data are optimized to make data processing more efficient. It also includes sorting the order of data packets, optimizing the storage and retrieval methods of data, and ensuring efficient data processing and access.

[0116] It adopts TCP / IP protocol, provides error detection, data sorting and data retransmission mechanisms, effectively handles data packet loss and errors, ensures the reliability of data transmission, and implements dynamic congestion control strategies, such as TCP congestion window adjustment, to dynamically adjust the data sending rate according to network conditions, reduce network congestion, and improve the overall throughput of the network.

[0117] Establish a real-time monitoring system to monitor key parameters such as signal quality and bit error rate, promptly detect and diagnose possible faults, and take appropriate measures to repair them.

[0118] Adopt secure encryption algorithms to encrypt and protect data to ensure data security and confidentiality. At the same time, conduct identity authentication and authorization management to prevent illegal access and data tampering.

[0119] Example 2

[0120] Based on the same inventive concept, the present invention also provides a marine ship communication system based on Ku-band communication, using the marine ship communication method as described above, comprising:

[0121] The satellite network control module includes a satellite configuration unit, a ship communication station construction unit and a satellite relay station deployment unit. The satellite configuration unit is used for satellite layout planning and orbit adjustment to ensure the coverage of the satellite system; the ship communication station construction unit is used to select an unobstructed and interference-free location on the ship to set up a communication station to ensure good antenna pointing, install and debug communication equipment, including satellite antennas, high-frequency heads and modems, for receiving and transmitting satellite signals; the satellite relay station deployment unit is used to deploy relay stations at ground stations or designated locations to receive, enhance and forward satellite signals; Figure 3 As shown in the figure, the satellite network control module is responsible for the effective management and operation of the entire marine ship communication system. The main implementation process is as follows:

[0122] Satellite resource leasing: Sign a leasing agreement with a satellite operator or service provider to obtain the forwarding resources of the Ku-band satellite.

[0123] Install the communication equipment of the ship-side station: On the ship, build a communication station, including satellite antenna, LNB, and modem equipment. The satellite antenna is used to receive and send satellite signals, the LNB down-converts the satellite signals to a usable frequency, and the modem demodulates and decodes the signals.

[0124] Signal transmission between ships and satellites, and between ships: The information to be transmitted (such as language, data, video, etc.) is modulated and encoded through the ship station equipment, and then sent to the satellite. After the satellite receives the signal, it will forward it to the ground station or other ships at the target receiving end. The receiving end equipment will demodulate, decode and process the signal to restore the original information, thereby realizing communication between ships, between ships and satellites, and between ships and ground stations.

[0125] A signal processing module includes a signal sending unit and a signal receiving unit, wherein the signal sending unit predicts the frequency offset through the relative speed and direction changes of the ships at the sending end and the receiving end, and adjusts the corresponding transmission frequency based on the frequency offset to perform frequency pre-compensation, and the transmitting end converts the communication data to be sent into a satellite signal through modulation and encoding, and sends it to the satellite through the satellite antenna of the transmitting end, and the satellite sends the satellite signal to the receiving end according to a preset forwarding rule; the signal receiving unit captures and down-converts the satellite signal through the satellite antenna and the high-frequency head, and converts the satellite signal into an available frequency range, wherein the monitoring module in the receiving end monitors and analyzes the frequency and phase change characteristics of the satellite signal in real time, and adjusts the parameters in the signal processor based on the change characteristics to compensate until it is consistent with the originally transmitted satellite signal, and the modem demodulates and decodes the processed satellite signal to restore the original communication data;

[0126] The network management and security module uses TCP / IP network protocol for data transmission, and applies congestion control mechanism to prevent network overload. It also uses encryption and authentication to protect data security and prevent unauthorized access.

[0127] The preferred embodiments of the present invention disclosed above are only used to help explain the present invention. The preferred embodiments do not describe all the details in detail, nor do they limit the invention to the specific implementation methods described. According to the content of this specification, many modifications and personalized choices of implementation methods can be made, including but not limited to different demodulation methods, different error correction and detection coding methods, and different sub-segment arrangements. This specification selects and specifically describes these embodiments in order to better explain the principles and practical applications of the present invention, so that those skilled in the art can understand and use the present invention well. The present invention is limited only by the claims and their full scope and equivalents.

Claims

1. A marine ship communication method based on Ku-band communication, It is characterized in that The following steps are involved: Step S1, configure and deploy Ku-band satellites so that the Ku-band network fully covers the corresponding ocean area, and establish a communication station on the ship. The communication station is equipped with communication equipment including satellite antennas, high-frequency heads and modems for sending and receiving Ku-band satellite signals; Step S2, predicting a frequency offset by the relative speed and direction change of the ship at the transmitting end and the receiving end, adjusting the corresponding transmitting frequency based on the frequency offset to perform frequency pre-compensation, the transmitting end converting the transmitted communication data into the satellite signal by modulation and encoding, and sending the signal to the satellite through the satellite antenna of the transmitting end, and the satellite sending the satellite signal to the receiving end according to a preset forwarding rule; Step S3, the receiving end captures and down-converts the satellite signal through the satellite antenna and the high-frequency head, and converts the satellite signal into a usable frequency range, wherein the monitoring module in the receiving end monitors and analyzes the change characteristics of the frequency and phase of the satellite signal in real time, and adjusts the parameters in the signal processor based on the change characteristics for compensation until it is consistent with the originally transmitted satellite signal, and the modem demodulates and decodes the processed satellite signal to restore the original communication data.

2. The marine vessel communication method according to claim 1, It is characterized in that In step S1, the communication station is also equipped with a backup communication channel and an antenna shield for communication stability under extreme weather conditions.

3. The marine vessel communication method according to claim 1, It is characterized in that In step S2, the frequency offset is predicted by the relative speed and direction change of the ship at the transmitting end and the receiving end, and the corresponding transmission frequency is adjusted based on the frequency offset to perform frequency pre-compensation, specifically, Acquiring motion parameters of the ship at the transmitting end and the receiving end, including real-time position, speed and direction data; Based on the action parameters and propagation path calculation, the predicted frequency offset is calculated, and the transmission frequency is dynamically adjusted for compensation to ensure that it can be synchronized with the receiving frequency of the receiving end; at the same time, the transmission power is dynamically adjusted according to the current environmental conditions and signal strength monitoring results.

4. The marine vessel communication method according to claim 3, It is characterized in that According to the current environmental conditions and signal strength monitoring results, the transmission power is dynamically adjusted. Specifically, Real-time monitoring of basic parameters of the current signal strength, including acquisition of the power, amplitude and signal-to-noise ratio of the current signal; Based on the monitored basic parameters and the environmental conditions, the environmental conditions include rain attenuation, a comparison is made with a preset reference value. When the signal strength is lower than the reference value, signal compensation is performed and the transmission power is adjusted.

5. The marine vessel communication method according to claim 1, It is characterized in that In step S2, it also includes: When the coverage distance of the satellite signal exceeds the distance of direct satellite transmission capability or faces specified geographical conditions, the satellite signal is sent to a satellite relay station on the ground, and the satellite relay station receives and enhances the satellite signal and then forwards it to the receiving end.

6. The marine vessel communication method according to claim 4, It is characterized in that The satellite signal is sent to a satellite relay station on the ground side, and the satellite relay station receives and enhances the satellite signal and then forwards it to the receiving end, specifically, Deploy the satellite relay station and equip it with the communication equipment; The satellite relay station receives the satellite signal through the communication device and enhances the signal through the signal enhancer; and performs error correction, filtering and optimization processing on the enhanced satellite signal; The processed satellite signal is modulated and encoded, and the satellite relay station determines the signal transmission path according to the position of the designated ship end and the signal reception condition; the signal transmission path includes sending directly to the receiving end, or performing multi-stage forwarding through at least one satellite relay station or satellite.

7. The marine vessel communication method according to claim 5, It is characterized in that The step S3 is specifically, receiving the satellite signal through the satellite antenna and performing down-conversion processing through the high-frequency head to convert the satellite signal into the available frequency range; The signal enhancer and filter amplify and filter the satellite signal after preliminary processing; According to the communication requirements and conditions, the corresponding debugging mode is selected, including QPSK and 8PSK, to improve the transmission rate and spectrum efficiency, and the satellite signal is redundantly encoded to correct the transmission error; The modulated satellite signal is demodulated and decoded by the modem to restore the original communication data.

8. The marine vessel communication method according to claim 6, It is characterized in that In step S3, the monitoring module in the receiving end monitors and analyzes the frequency and phase change characteristics of the satellite signal in real time, and adjusts the parameters in the signal processor for compensation based on the change characteristics until it is consistent with the originally transmitted satellite signal, specifically, The detection module monitors the frequency offset and phase change of the satellite signal in real time; Adjusting parameters within the signal processor including filter settings and signal sampling rate, performing frequency compensation, and performing frequency correction; The phase of the input satellite signal is compared with the phase of a preset reference signal by a phase comparator, and the phase difference signal obtained by processing the loop filter adjusts the output of the VCO so that the frequency and the phase of the satellite signal accurately match the originally transmitted satellite signal.

9. The marine vessel communication method according to claim 1, It is characterized in that The method further includes step S4, using the TCP / IP network protocol to ensure the reliability of data transmission, applying a congestion control mechanism to prevent network overload, and using encryption and authentication to protect data security to prevent unauthorized access.

10. A marine vessel communication system based on Ku-band communication, using the marine vessel communication method according to claims 1 to 9, It is characterized in that include, The satellite network control module includes a satellite configuration unit, a ship communication station construction unit and a satellite relay station deployment unit, wherein the satellite configuration unit is used for the layout planning and orbit adjustment of the satellite to ensure the coverage of the satellite system; the ship communication station construction unit is used to set up a communication station on the ship, install and debug communication equipment, including satellite antennas, high-frequency heads and modems, for receiving and transmitting satellite signals; the satellite relay station deployment unit is used to deploy a relay station at a ground station or a designated location for receiving, enhancing and forwarding the satellite signal; A signal processing module, comprising a signal sending unit and a signal receiving unit, wherein the signal sending unit predicts a frequency offset through the relative speed and direction changes of the ship at the sending end and the receiving end, and adjusts the corresponding transmission frequency based on the frequency offset to perform frequency pre-compensation, the transmitting end converts the communication data to be sent into the satellite signal through modulation and encoding, and sends it to the satellite through the satellite antenna of the transmitting end, and the satellite sends the satellite signal to the receiving end according to a preset forwarding rule; the signal receiving unit captures and down-converts the satellite signal through the satellite antenna and the high-frequency head, and converts the satellite signal into an available frequency range, wherein the monitoring module in the receiving end monitors and analyzes the frequency and phase change characteristics of the satellite signal in real time, and adjusts the parameters in the signal processor based on the change characteristics to compensate until it is consistent with the originally transmitted satellite signal, and the modem demodulates and decodes the processed satellite signal to restore the original communication data; The network management and security module uses TCP / IP network protocol for data transmission, and applies congestion control mechanism to prevent network overload. It also uses encryption and authentication to protect data security and prevent unauthorized access.

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