Satellite-based emergency communication method and system

Abstract

The invention discloses an emergency communication method and system based on satellites, and the method comprises the steps: detecting surrounding available satellite resources when a mobile terminal device receives an emergency communication request, so as to obtain a satellite group comprising a plurality of satellites; selecting and accessing a target satellite from the satellite group; the satellites of different orbits in the satellite group share link state data through links between the satellites; according to the current communication priority transmission strategy and the link state data, autonomously performing connection switching with the mobile terminal equipment between a target satellite currently connected with the mobile terminal equipment and the latest affirmed optimal satellite; and dynamically adjusting a satellite connected with the mobile terminal equipment based on the predicted link state data and the current communication priority transmission strategy. Based on the method, through multi-satellite cooperation and dynamic link switching, the continuity and stability of a communication link are ensured, the communication quality is effectively improved, and the risk of communication interruption is reduced.

Description

Technical Field

[0001] The present invention relates to the field of mobile communication technology, and in particular to a satellite-based emergency communication method and system. Background Art

[0002] In recent years, with the increase in global natural disasters, emergencies and communication needs in remote areas, the limitations of traditional communication networks have become increasingly prominent. Ground communication networks are easily damaged in disasters, while network coverage in remote areas has always been limited by cost and technical difficulties. Therefore, satellite-based emergency communication technology has emerged, aiming to achieve reliable and continuous communication capabilities through multi-layer satellite collaboration networks such as low orbit (LEO), medium orbit (MEO) and high orbit (GEO). LEO satellites have become the preferred communication nodes in emergencies with their advantages of low latency and high bandwidth, while MEO and GEO are supplemented by stability and wide coverage capabilities, ensuring that multi-level satellite collaboration can cover a variety of complex scenarios (such as mountainous areas and oceans). In addition, the development of inter-satellite links (ISLs) has greatly improved the self-healing capabilities of communication links, and through dynamic load balancing and cross-orbit link switching mechanisms, efficient utilization of communication resources and continuous connectivity in disaster scenarios have been achieved.

[0003] However, existing emergency communication technologies have several significant drawbacks when facing application scenarios in disasters or remote areas. First, traditional ground networks are easily damaged in disasters, resulting in communication interruptions. Although satellite communications can serve as a supplement, they face problems such as high latency and uneven coverage. Although high-orbit (GEO) satellites have a wide coverage area, they have high latency and cannot meet real-time requirements. Although low-orbit (LEO) satellites have low latency, they have limited coverage and lack a mechanism for rapid switching when the link is interrupted. In addition, existing technologies lack efficient collaboration between satellites, resulting in uneven resource allocation and affecting the execution efficiency of high-priority tasks. Summary of the invention

[0004] The object of the present invention is to provide a satellite-based emergency communication method and system that realizes efficient and continuous communication capabilities through multi-orbit satellite cooperation and dynamic resource allocation.

[0005] In order to achieve the above object, the present invention provides a satellite-based emergency communication method, which comprises: When the mobile terminal device receives an emergency communication request, it detects surrounding available satellite resources to obtain a satellite group including a plurality of satellites, wherein the satellite group includes a low-orbit satellite, a medium-orbit satellite, and a high-orbit satellite; Based on the principle of low orbit priority and according to a preset link characteristic table recording the link characteristics of several satellites, a target satellite is selected and accessed from the satellite group; Satellites in different orbits in the satellite group share link status data through inter-satellite links, wherein the link status data includes link performance data between the satellite and the mobile terminal device and inter-satellite link performance data; According to the current communication priority transmission strategy and the link status data, autonomously switching the connection with the mobile terminal device between the target satellite currently connected to the mobile terminal device and the most recently identified optimal satellite; The link status data is processed based on the ground satellite control center to obtain predicted link status data corresponding to each satellite in the satellite group in a future period of time, and the satellite connected to the mobile terminal device is dynamically adjusted based on the predicted link status data and the current communication priority transmission strategy.

[0006] Preferably, the method further includes a positioning method for positioning the position of the mobile terminal device: Generate initial positioning data based on the satellite positioning module in the mobile terminal device; generating motion state data of the mobile terminal device based on an accelerometer and a gyroscope in the mobile terminal device; Processing the motion state information to generate error data; The initial positioning data is adjusted using the error data to generate target positioning data corresponding to the location of the mobile terminal device.

[0007] Preferably, when the positioning signal of the satellite positioning module is weaker than a preset value, target positioning data corresponding to the location of the mobile terminal device is collaboratively generated based on three satellites belonging to a low-orbit satellite, a medium-orbit satellite, and a high-orbit satellite.

[0008] Preferably, the communication priority transmission strategy includes: if the event type of the current emergency communication request is high priority, the mobile terminal device is preferentially connected to a satellite in a lower orbit; if the event type of the current emergency communication request is low priority, the mobile terminal device is preferentially connected to a satellite in a higher orbit.

[0009] Preferably, the communication data between the mobile terminal device and the connected satellite is transmitted in encrypted form, and the encryption strength is dynamically adjusted according to the sensitivity of the transmitted data and the network risk environment.

[0010] Preferably, according to a preset authorization management strategy, based on a ground satellite control center, the target positioning data of the mobile terminal device is forwarded to a corresponding third party.

[0011] Preferably, the ground satellite control center predicts and processes the target positioning data and the environmental parameters of the location corresponding to the target positioning data to generate a dynamic geographic fence, which is related to the scope affected by the event that triggered the emergency communication request, and sends early warning information to mobile terminal devices within the dynamic geographic fence.

[0012] The present invention also provides a satellite-based emergency communication system, which operates based on the emergency communication method as described above.

[0013] The present invention also provides an emergency communication system, comprising: one or more processors; Memory; and one or more programs, wherein the one or more programs are stored in the memory and configured to be executed by the one or more processors, the programs comprising instructions for executing the emergency communication method as described above.

[0014] The present invention also provides a computer-readable storage medium, which includes a computer program, and the computer program can be executed by a processor to implement the emergency communication method as described above.

[0015] Compared with the prior art, the emergency communication method provided by the above technical solution of the present invention, firstly, adopts the low-orbit priority principle, can quickly access the satellite network, and improve the response speed of emergency communication; secondly, by sharing link status data through inter-satellite links, satellites in different orbits autonomously switch connections with mobile terminal devices, ensuring the continuity and stability of the communication link; finally, dynamically adjusting the connection satellite based on the predicted link status data, effectively improving the communication quality and reducing the risk of communication interruption. In summary, this technical solution can significantly improve the reliability and efficiency of emergency communications. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] Figure 1 The figure is a flow chart of the emergency communication method in an embodiment of the present invention. DETAILED DESCRIPTION

[0017] In order to explain the technical content, structural features, achieved objectives and effects of the present invention in detail, the following is a detailed description in conjunction with the implementation methods and the accompanying drawings.

[0018] This embodiment discloses a satellite-based emergency communication method for use in communication situations in emergency situations, for example, when the local ground communication network is not smooth due to a natural disaster and emergency rescue is needed, or when a user suddenly has a physical condition in an area with poor ground network signals and needs rescue.

[0019] The emergency communication method includes the following process: S10: When a mobile terminal device (UE) receives an emergency communication request, it detects surrounding available satellite resources to obtain a satellite group including several satellites, where the satellite group includes low-orbit satellites (LEO satellites), medium-orbit satellites (MEO satellites) and high-orbit satellites (GEO satellites).

[0020] S11: Based on the principle of low orbit priority and according to a preset link characteristic table recording the link characteristics of several satellites, a target satellite is selected and accessed from the satellite group.

[0021] Satellites in different orbits in a satellite group share link status data through inter-satellite links. The link status data includes link performance data between the satellite and the UE and inter-satellite link performance data.

[0022] S12: autonomously switching the connection with the mobile terminal device between the target satellite currently connected to the mobile terminal device and the newly identified optimal satellite according to the current communication priority transmission strategy and link status data; S13: The ground-based satellite control center processes the link status data to obtain predicted link status data corresponding to each satellite in the satellite group in the future, and dynamically adjusts the satellite connected to the mobile terminal device based on the predicted link status data and the current communication priority transmission strategy.

[0023] Specifically, the sources of the alarm signal that triggers the emergency communication request include: the user presses the SOS button on the UE (such as a mobile phone) to trigger emergency rescue and generate an alarm signal, the UE (such as a bracelet) detects that the user has a serious health condition and sends an alarm signal, or the UE (with an environmental detection sensor or a corresponding APP) detects an environmental crisis and sends an alarm signal.

[0024] In addition, when an alarm signal is generated, the UE will also collect the event type, timestamp, and device status information that currently triggers the alarm signal, and add this information to the emergency communication request. The status information here includes the UE's power status, network connection status, and location status. Moreover, the location status here is generated by the UE's own satellite positioning module.

[0025] The performance parameters recorded in the link characteristics table include satellite coverage, frequency band priority, signal delay parameters and round-trip delay.

[0026] The satellite control center on the ground processes and analyzes the link status data obtained from the satellite group through the network data analysis function NWDAF to predict the link status of each satellite in the future. NWDAF combines the current communication priority transmission strategy to dynamically adjust the target satellite to which the UE is connected to ensure high reliability and low latency of emergency communications.

[0027] For example, when NWDAF predicts that a LEO satellite will experience signal interruption or severe interference in the future, NWDAF will switch the UE to another LEO satellite, MEO, or GEO in better health in advance to avoid communication interruption and ensure reliable transmission of emergency communications.

[0028] It should be noted that, in this embodiment, there are two ways to adjust the satellite accessed by the UE. One is autonomous adjustment based on inter-satellite links, autonomous adjustment between satellites; the other is comprehensive adjustment based on the ground satellite control center.

[0029] In this regard, based on the autonomous adjustment of inter-satellite links, it is possible to quickly identify links with high load or potential failures, plan task migration in advance and allocate resources. It also provides support for satellite collaboration in complex situations, enhancing real-time response capabilities and distributed collaboration efficiency. When NWDAF fails to respond in time due to delays or interruptions, it ensures the execution of emergency tasks. In addition, sharing link performance data between satellites can also improve the efficiency of task scheduling, reduce the load of NWDAF through distributed data collection, and enhance the system's fault tolerance in extreme environments, realizing an organic combination of centralized management and distributed collaboration.

[0030] On the other hand, for some areas (such as mountainous areas), satellite signals may be very weak or even blocked by mountains. When the satellite signal is detected to be lower than the preset threshold, the UE will automatically increase the transmission power to ensure that the signal can reach the satellite. At the same time, the signal modulation method will be dynamically adjusted according to the real-time channel conditions. For example, QPSK (quadrature phase shift keying) has high transmission efficiency, but also has high requirements for signal quality; BPSK (binary phase shift keying) has strong anti-interference ability, but slightly lower efficiency. If the signal quality is poor, the UE will switch to BPSK to ensure that the information can be successfully sent.

[0031] On the other hand, when an emergency occurs, the UE needs to send out critical information quickly. Therefore, in order to shorten the information transmission time, the UE can also use dynamic compression algorithms to compress the size of the data packet to reduce the amount of data transmission. At the same time, the UE can also encode the priority of critical information (such as earthquakes, SOS signals, and timestamps) and put it in the header of the data packet to ensure that this information is given priority during the transmission process and can be delivered even if the bandwidth is low or the delay is high.

[0032] On the other hand, if the UE takes photos or videos of the scene of an emergency, the UE's dynamic sampling algorithm will automatically adjust the resolution and frame rate according to the link status, giving priority to fast transmission of core data rather than pursuing high image quality. In order to further improve data transmission efficiency, the UE will use frequency band aggregation technology to access multiple frequency bands at the same time, increase transmission bandwidth, and improve transmission speed. The resource scheduling algorithm will dynamically allocate bandwidth and adjust frequency band priorities according to real-time channel conditions to ensure efficient use of bandwidth resources.

[0033] On the other hand, in order to improve the standby time of UE in emergency events, the UE automatically switches between standby mode and emergency activation mode to extend battery life. In emergency activation mode, the UE consumes more power to maintain connection and transmit data.

[0034] On the other hand, in commonly used GNSS positioning, multipath errors often occur. Multipath errors refer to the fact that when the GNSS signal reaches the receiver, there is not only one direct path, but multiple reflection paths. The signals of these reflection paths will be superimposed on the direct signal, causing deviations in the signal strength and arrival time measured by the receiver, thereby affecting the positioning accuracy. In this regard, the emergency communication method in this embodiment also includes a positioning method for accurately locating the position of the mobile terminal device: First, initial positioning data is generated based on the satellite positioning module in the UE.

[0035] Then, the UE's motion state data is generated based on the accelerometer and gyroscope in the UE. For example, if the user is in a moving vehicle or on a bumpy road, the accelerometer will detect a large acceleration value. In this case, the possibility of multipath error increases because the signal is more susceptible to reflections from the surrounding environment. Vigorous movement will introduce additional signal interference, making multipath signals more difficult to distinguish.

[0036] Next, the motion state information is processed based on the pre-trained intelligent model to generate error data.

[0037] The initial positioning data is adjusted using the error data to generate target positioning data corresponding to the location of the mobile terminal device.

[0038] On the other hand, when the positioning signal of the satellite positioning module is weaker than the preset value, target positioning data corresponding to the location of the mobile terminal device is collaboratively generated based on three satellites belonging to low-orbit satellites, medium-orbit satellites, and high-orbit satellites.

[0039] In this embodiment, when the user presses the SOS button, the UE starts to perform the following tasks: The UE first attempts to use the built-in GNSS chip (such as GPS, BeiDou) to receive satellite signals for positioning and generate initial positioning data.

[0040] Sensor-assisted positioning: The UE uses built-in sensors (accelerometer and gyroscope) to collect motion data. The accelerometer measures the acceleration of the UE, and the gyroscope measures the rotation speed of the UE. These data are combined with GNSS data and generated through machine learning models (such as Kalman filter) to generate target positioning data.

[0041] If the GNSS signal is not sufficient to provide reliable positioning, the position of the user device is obtained through the inter-satellite link (ISL) using multi-orbit collaborative positioning technology based on RTT-assisted calculation to ensure the continuity of positioning in complex environments such as tunnels or dense forests.

[0042] On the other hand, the positioning data (including latitude and longitude, altitude, timestamp, positioning method and other information) is sent by the UE to the edge computing node on the satellite connected to it.

[0043] Edge computing nodes remove redundant data, such as some unnecessary sensor data, and only retain key positioning information.

[0044] To reduce the amount of data transmission, edge computing nodes compress the data, for example, using ZIP or more advanced compression algorithms.

[0045] In addition, according to the sensitivity of the location information and the network environment, the edge computing node will also dynamically adjust the encryption strength. For example, for highly sensitive data (precise location information and user identity), AES-256 encryption is used in a high-risk network environment to ensure the highest security. For medium-sensitive data (fuzzy location information), AES-192 encryption is used in a medium-risk environment to strike a balance between security and performance. For low-sensitivity data, AES-128 encryption is used in a low-risk network environment to increase transmission speed and reduce computing overhead. At the same time, for data with real-time requirements, low-intensity encryption is preferred to reduce latency, while the encryption strength of batch-transmitted data is adjusted according to risk.

[0046] On the other hand, the communication priority transmission strategy includes: if the event type of the current emergency communication request is high priority, the UE is preferentially connected to a satellite in a lower orbit; if the event type of the current emergency communication request is low priority, the UE is preferentially connected to a satellite in a higher orbit.

[0047] Such a dynamic priority adjustment mechanism can not only optimize resource allocation, but also significantly improve the transmission efficiency of important positioning information. This multi-satellite collaboration is particularly important in extreme situations and can provide more reliable positioning support for mission-critical scenarios (such as disaster relief). In disaster or severe weather scenarios, NWDAF can quickly identify affected links and trigger a dynamic frequency band switching mechanism. When the high-frequency band link is severely interfered, it will be switched to the low-frequency band first to improve the signal penetration capability. At the same time, NWDAF combines multi-path redundant transmission strategies to transmit high-priority communication data in parallel on multiple links.

[0048] On the other hand, the emergency communication method in this embodiment further includes: According to the preset authorization management strategy, based on the ground satellite control center, the target positioning data of the mobile terminal device is forwarded to the corresponding third party.

[0049] In addition, the authorization management policy can be dynamically adjusted based on user privacy preferences and network conditions.

[0050] For example, in an emergency, NWDAF will prioritize sharing high-precision location information to ensure rescue efficiency. In non-emergency scenarios, NWDAF will limit the sharing of data accuracy according to the user's privacy preferences.

[0051] Specifically, the authorization management strategy includes: for high-priority events, the UE location information is quickly shared with trusted third parties (such as government agencies and rescue organizations); for low-priority events, a batch authorization mode is adopted to regularly push data to relevant agencies to support subsequent analysis.

[0052] For example, a mountain torrent hits a village in a remote mountainous area, and the villager Xiao Wang is trapped and calls for emergency help through his mobile phone, that is, pressing the SOS button on his mobile phone. When the emergency communication request identifies Xiao Wang's current distress signal as a "life-threatening" emergency event, the event is given a high priority.

[0053] Authorization policy generation: The network function entity (NEF) in the ground satellite control center automatically generates a set of real-time authorization policies based on this top priority. This set of policies stipulates that Xiao Wang’s high-precision location information can be shared in real time with three pre-authorized third parties: Local government emergency management department: used to quickly organize rescue teams and determine rescue routes; Rescue team command center: used to track Xiao Wang's location in real time and guide rescue; Medical assistance agency: used to assess Xiao Wang’s urgency and prepare medical supplies in advance.

[0054] On the other hand, the entire authorization process is recorded in the smart contract on the blockchain, including the authorization time, the authorized object, the authorization content (high-precision location data), and the authorization validity period (for example, the end of the rescue operation). This ensures the transparency and immutability of the authorization process, avoiding the risk of human intervention and data leakage.

[0055] Authorized third parties can access this data only within the scope of smart contract authorization. Any unauthorized attempts will be rejected by the smart contract.

[0056] In addition, NWDAF will continue to monitor the data access behavior of the three authorized agencies, including access frequency, access time, data access volume, etc.

[0057] If NWDAF finds that an institution's access behavior is abnormal (for example, access frequency is too high, access time is too long, access data exceeds the authorized scope), an alarm will be triggered and a warning will be issued to the system administrator.

[0058] System administrators can dynamically adjust authorization policies based on NWDAF’s analysis results, such as reducing or even revoking the access rights of an institution. This ensures data security and prevents data from being abused.

[0059] For batch authorization mode: Assume that in addition to Xiao Wang's high-precision location, the satellite also collects some other information through the network, such as the scope of the flooded area, the number of people affected, etc. This information has little impact on real-time rescue and is low-priority data. These low-priority data will be aggregated, compressed and AES-128 encrypted at the edge computing node. These encrypted low-priority data will not be transmitted in real time, but will be pushed to relevant government departments in batch mode regularly (for example, every hour) for post-disaster assessment and disaster statistics.

[0060] On the other hand, the pre-trained intelligent model set up in the ground satellite control center predicts and processes the target positioning data and the environmental parameters of the location corresponding to the target positioning data to generate a dynamic geo-fence. The dynamic geo-fence is related to the scope affected by the event that triggered the emergency communication request, and sends early warning information to mobile terminal devices within the dynamic geo-fence.

[0061] The following is a detailed explanation of the generation and application of dynamic geographic fences using a real scenario.

[0062] Assume that a sudden landslide occurs, affecting parts of Village A and Village B in the mountainous area. An evacuation notice needs to be urgently broadcast to the people in the affected area.

[0063] 1. NWDAF predicts affected areas: NWDAF first collects data from multiple sources, including user location data and environmental parameters.

[0064] Environmental parameters include real-time environmental data of village A and village B in the mountainous area obtained from meteorological satellites and ground meteorological stations, including rainfall, wind speed, visibility, etc. These data are crucial for predicting signal propagation and broadcasting effects. Landslide range data are also included: they may come from geological survey departments or disaster monitoring systems, providing the specific range of landslides and potential threat areas.

[0065] NWDAF uses AI models (e.g., models that combine machine learning and geographic information systems GIS) to analyze the data. The models analyze the distribution density of user devices in the affected area to ensure that the broadcast can reach as many disaster victims as possible.

[0066] Based on the above analysis, NWDAF generates a dynamic geo-fence to accurately define the area that needs to receive evacuation notifications.

[0067] 2. PCF (Policy Control Function) allocates resources and broadcasts: PCF selects the appropriate transmission channel based on the network conditions. For example: Low-frequency channels: Due to the complex terrain in mountainous areas, signals are easily blocked by mountains. PCF will give priority to low-frequency channels with stronger penetration capabilities (for example, radio waves in certain specific frequency bands) to ensure that notifications can reach deep in the mountains.

[0068] In addition, to improve reliability, PCF will select multiple channels (for example, using LTE, 5G networks and satellite networks at the same time) to transmit the same broadcast information. If one channel is interrupted, other channels can continue to transmit to ensure that information is not lost.

[0069] PCF also adjusts the type and priority of broadcast content based on network conditions and user device capabilities. For example, it prioritizes sending concise text or voice notifications, while delaying more bandwidth-intensive content such as images or videos until network conditions improve. High-priority messages (for example, "Evacuate immediately") are transmitted first.

[0070] PCF will dynamically allocate resources based on the status of different channels to ensure that each channel can efficiently transmit broadcast information. If the load on a channel is too high, PCF will automatically adjust resource allocation and transfer part of the traffic to other channels.

[0071] UE (User Equipment) receives and responds: UEs located within the dynamic geo-fence will receive an evacuation notification.

[0072] The UE will feed back the reception status information (e.g., notification arrival time, whether it is successfully received, signal quality) to the NWDAF, which helps the NWDAF to evaluate the broadcast effect and optimize the subsequent broadcast strategy.

[0073] 4. NWDAF closed-loop optimization: NWDAF collects feedback data from all UEs and analyzes the data in combination with environmental parameters and broadcast strategies. Based on the analysis results, NWDAF can adjust future broadcast strategies, such as optimizing the shape and size of geofences, adjusting resource allocation strategies for different channels, and optimizing the type and format of broadcast content.

[0074] On the other hand, NWDAF also collects communication status data (such as delay, packet loss rate) and user feedback (such as ratings, complaints) in real time, and compares these data with the QoS prediction model to dynamically evaluate the differences in resource allocation and service quality. NWDAF generates optimization solutions based on these differences and adjusts resource scheduling strategies in a timely manner. After receiving user feedback, the edge computing node located in the satellite first performs preliminary processing and analysis, generates optimization suggestions and quickly transmits them back to NWDAF. Through the distributed deployment of edge computing, the response time of the feedback loop is greatly shortened, further improving the accuracy of resource scheduling and service quality. UE continuously uploads real-time communication status and experience data (such as transmission delay, content arrival rate). NWDAF uses this data as input and optimizes the resource allocation strategy in combination with the user grouping model. For example, more resources will be allocated to areas where high-priority users are located, while resource allocation in areas where ordinary users are located will be dynamically adjusted according to network conditions.

[0075] In addition, through the visualization engine, NWDAF displays the optimization results (such as reduced latency and improved coverage) to network operators in real time, supporting them in formulating long-term optimization strategies while enhancing users' perception and satisfaction with service quality.

[0076] In summary, the present invention discloses a satellite emergency communication method. First, by adopting the low-orbit priority principle, it can quickly access the satellite network and improve the response speed of emergency communications. Secondly, by sharing link status data through inter-satellite links, satellites in different orbits autonomously switch connections with mobile terminal devices, ensuring the continuity and stability of the communication link. Furthermore, the connection satellite is dynamically adjusted based on the predicted link status data, which effectively improves the communication quality and reduces the risk of communication interruption. In addition, the present invention introduces dynamic authorization and precise broadcasting technology to improve the transmission efficiency and coverage of emergency information, and provides all-round support for communication needs in disaster scenarios. In summary, this technical solution can significantly improve the reliability and efficiency of emergency communications.

[0077] In another preferred embodiment of the present invention, a satellite-based emergency communication system is also disclosed for controlling the communication connection between the UE and the communication satellite in an emergency situation. The communication system operates based on the emergency communication method in the above embodiment.

[0078] The present invention also discloses another emergency communication system, which includes one or more processors, a memory and one or more programs, wherein the one or more programs are stored in the memory and are configured to be executed by the one or more processors, and the program includes instructions for executing the emergency communication method as described above. The processor can adopt a general central processing unit (CPU), a microprocessor, an application specific integrated circuit (ASIC), or one or more integrated circuits to execute relevant programs to implement the functions required to be executed by the modules in the emergency communication system of the embodiment of the present application, or to execute the emergency communication method of the method embodiment of the present application.

[0079] The present invention also discloses a computer-readable storage medium, which includes a computer program, and the computer program can be executed by a processor to complete the emergency communication method as described above. The computer-readable storage medium can be any available medium that can be accessed by a computer or a data storage device such as a server or a data center that includes one or more available media integrated. The available medium can be a read-only memory (ROM), or a random access memory (RAM), or a magnetic medium, such as a floppy disk, a hard disk, a tape, a magnetic disk, or an optical medium, such as a digital versatile disc (DVD), or a semiconductor medium, such as a solid state disk (SSD), etc.

[0080] The embodiment of the present application also discloses a computer program product or a computer program, which includes a computer instruction stored in a computer-readable storage medium. A processor of an electronic device reads the computer instruction from the computer-readable storage medium, and the processor executes the computer instruction, so that the electronic device executes the above-mentioned emergency communication method.

[0081] The above disclosure is only the preferred embodiment of the present invention, which certainly cannot be used to limit the scope of rights of the present invention. Therefore, equivalent changes made according to the scope of the patent application of the present invention are still within the scope covered by the present invention.

Claims

1. A satellite-based emergency communication method, characterized in that: include: When the mobile terminal device receives an emergency communication request, it detects surrounding available satellite resources to obtain a satellite group including a plurality of satellites, wherein the satellite group includes a low-orbit satellite, a medium-orbit satellite, and a high-orbit satellite; Based on the principle of low orbit priority and according to a preset link characteristic table recording the link characteristics of several satellites, a target satellite is selected and accessed from the satellite group; Satellites in different orbits in the satellite group share link status data through inter-satellite links, wherein the link status data includes link performance data between the satellite and the mobile terminal device and inter-satellite link performance data; According to the current communication priority transmission strategy and the link status data, autonomously switching the connection with the mobile terminal device between the target satellite currently connected to the mobile terminal device and the most recently identified optimal satellite; The link status data is processed based on the ground satellite control center to obtain predicted link status data corresponding to each satellite in the satellite group in a future period of time, and the satellite connected to the mobile terminal device is dynamically adjusted based on the predicted link status data and the current communication priority transmission strategy.

2. The satellite-based emergency communication method according to claim 1, characterized in that: Also included is a positioning method for locating the position of a mobile terminal device: Generate initial positioning data based on the satellite positioning module in the mobile terminal device; generating motion state data of the mobile terminal device based on an accelerometer and a gyroscope in the mobile terminal device; Processing the motion state information to generate error data; The initial positioning data is adjusted using the error data to generate target positioning data corresponding to the location of the mobile terminal device.

3. The satellite-based emergency communication method according to claim 2, characterized in that: When the positioning signal of the satellite positioning module is weaker than a preset value, target positioning data corresponding to the location of the mobile terminal device is collaboratively generated based on three satellites belonging to a low-orbit satellite, a medium-orbit satellite, and a high-orbit satellite.

4. The satellite-based emergency communication method according to claim 1, characterized in that: The communication priority transmission strategy includes: if the event type of the current emergency communication request is high priority, the mobile terminal device is preferentially connected to a satellite in a lower orbit; if the event type of the current emergency communication request is low priority, the mobile terminal device is preferentially connected to a satellite in a higher orbit.

5. The satellite-based emergency communication method according to claim 1, characterized in that: The communication data between the mobile terminal device and the connected satellite is transmitted in encrypted form, and the encryption strength is dynamically adjusted according to the sensitivity of the transmitted data and the network risk environment.

6. The satellite-based emergency communication method according to claim 2, characterized in that: According to the preset authorization management strategy, based on the ground satellite control center, the target positioning data of the mobile terminal device is forwarded to the corresponding third party.

7. The satellite-based emergency communication method according to claim 2, characterized in that: The ground satellite control center predicts and processes the target positioning data and the environmental parameters of the location corresponding to the target positioning data to generate a dynamic geographic fence, which is related to the scope affected by the event that triggered the emergency communication request, and sends early warning information to mobile terminal devices within the dynamic geographic fence.

8. A satellite-based emergency communication system, characterized in that: The communication system operates based on the emergency communication method according to any one of claims 1 to 7.

9. An emergency communication system, characterized in that: include: one or more processors; Memory; and one or more programs, wherein the one or more programs are stored in the memory and configured to be executed by the one or more processors, the programs comprising instructions for executing the emergency communication method according to any one of claims 1 to 7.

10. A computer-readable storage medium, characterized in that: The invention comprises a computer program which can be executed by a processor to implement the emergency communication method according to any one of claims 1 to 7.

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