A method and system for constructing a blind area and emergency communication based on a low-orbit satellite

Abstract

The application discloses a kind of based on low-orbit satellite construction blind area, emergency communication method and system, it is related to emergency communication technical field, comprising the following steps: based on natural disaster area geographic location data and low-orbit satellite operation data, constructs emergency communication network architecture;Ground communication network is based on the instant messaging equipment quantity in data transmission state adaptive adjustment different data type data transmission rate;Star-ground communication network is based on data type selection star-ground communication link, and data is transmitted from ground communication network to low-orbit satellite communication network by intelligent communication transfer station;Whether the original communication coverage range based on low-orbit satellite communication network passes through emergency command center geographic location selection data transfer transmission mode data is transmitted to emergency command center;Emergency command center is based on the data received and generates emergency plan, and according to data transmission original path transmission to specified intelligent display terminal;Realize the communication network coverage of wide-range disaster blind area is quickly completed.

Description

Technical Field

[0001] This invention relates to the field of emergency communication technology, and in particular to a method and system for constructing emergency communication in blind zones based on low-Earth orbit satellites. Background Technology

[0002] Currently, after large-scale natural disasters, existing ground-based communication infrastructure is highly susceptible to damage, resulting in large-scale communication blind spots. This prevents data from being transmitted back to the emergency command center in a timely manner, hindering the command center's ability to issue rescue orders and severely impeding rescue efforts. Traditional ground-based emergency communication supplementation methods rely on the manual deployment of ground base stations, which is not only slow to deploy but also struggles to achieve rapid full coverage in disaster-prone terrain, failing to meet the emergency communication needs of large-scale disasters. While medium- and high-orbit satellite communication can achieve wide-area coverage, single-satellite bandwidth resources are limited, and deployment costs are high, easily leading to resource shortages when facing concurrent communication demands from numerous field terminals. Existing low-orbit satellite emergency communication solutions mostly fail to differentiate resource allocation based on the different data transmission needs at disaster sites, nor do they flexibly select data relay transmission paths according to the operational characteristics of low-orbit satellites. This easily leads to the waste of critical communication resources, fails to prioritize real-time communication needs during emergency rescue, and makes it difficult to quickly and efficiently provide emergency communication support in disaster blind spots. Summary of the Invention

[0003] To overcome the shortcomings of existing technologies, this invention provides a method and system for constructing blind zones and emergency communications based on low-orbit satellites, which enables rapid completion of communication network coverage in large-scale disaster blind zones and allows on-site rescue personnel to obtain command instructions in a timely manner to carry out rescue work.

[0004] To achieve the above-mentioned objectives, the present invention adopts the following technical solution: The first aspect of this application provides a method for constructing blind zone and emergency communication based on low-Earth orbit satellites, including the following steps: S101. Based on geographical location data of natural disaster areas and low-orbit satellite operation data, construct an emergency communication network architecture, which includes a terrestrial communication network, a low-orbit satellite communication network, and a space-to-ground communication network. S102. The terrestrial communication network adaptively adjusts the data transmission rate of different data types based on the number of instant messaging devices in data transmission state. S103, the satellite-to-ground communication network selects the satellite-to-ground communication link based on the data type, and transmits data from the ground communication network to the low-Earth orbit satellite communication network through the intelligent communication relay base station; S104. Based on the original communication coverage area of ​​the low-orbit satellite communication network, whether the data is transmitted to the emergency command center through the geographical location of the emergency command center by selecting a data relay transmission method; S105. The emergency command center generates an emergency plan based on the received data and transmits it to the designated intelligent display terminal along the original data transmission path.

[0005] Furthermore, based on geographical location data of natural disaster areas and low-Earth orbit satellite operational data, the construction of an emergency communication network architecture includes the following steps: A terrestrial communication network will be built based on the geographical location data of natural disaster areas and the communication range of mobile communication terminals to achieve complete communication coverage of natural disaster areas; Based on the geographical location data of natural disaster areas, target low-Earth orbit satellite orbits and low-Earth orbit satellites are selected from low-Earth orbit satellite operation data, and a low-Earth orbit satellite communication network is built. A satellite-to-ground communication network is established by connecting the low-orbit satellite communication network with the terrestrial communication network through intelligent communication relay base stations.

[0006] Furthermore, establishing a terrestrial communication network based on geographical location data of natural disaster areas and the communication range of mobile communication terminals includes the following steps: Based on the geographical location data of natural disaster areas and the communication range of mobile communication terminals, determine the installation locations of all mobile communication terminals within the natural disaster areas; Once the mobile communication terminal arrives at the designated location, it constructs a terrestrial communication network based on a self-organizing network approach. The terrestrial communication network is configured to adaptively adjust the data transmission rate of different data types based on the number of instant messaging devices in data transmission state. The data types include instant messaging data types and sensor data types.

[0007] Furthermore, based on the geographical location data of natural disaster areas, the target low-Earth orbit satellite orbits and low-Earth orbit satellites are selected from the low-Earth orbit satellite operation data, and the low-Earth orbit satellite communication network is established, including the following steps: Based on the selected target low-Earth orbit satellites, the satellites are grouped according to their orbits, with each group corresponding to a low-Earth orbit satellite orbit. Calculate the satellite transit interval for each low orbit and determine if there is a communication gap in that low orbit. If a communication gap exists, record the start and end times of the low-Earth orbit communication gap, as well as the total duration of the communication gap; If there is no communication gap, the low orbit is marked as a continuously connected orbit.

[0008] Furthermore, the terrestrial communication network adaptively adjusts the data transmission rate of different data types based on the number of instant messaging devices in data transmission state, including the following steps: Based on the number of instant messaging devices in data transmission state, determine the data transmission rate requirement for the current instant messaging data type. Based on the number of data acquisition devices in data transmission state, determine the data transmission rate requirement of the current sensor data type, and set the minimum data transmission rate threshold for sensor data type and the maximum data transmission rate threshold for instant messaging data type to ensure the minimum sensor data transmission requirement. Based on the data transmission rate requirements of the current instant messaging data type and the data transmission rate requirements of the current sensor data type, determine the current data transmission rate requirement. If the current data transmission rate requirement is less than or equal to the total data transmission rate threshold, then no data transmission rate limit will be imposed on the data transmission rate of sensor data types and the data transmission rate of instant messaging data types. If the current data transmission rate requirement exceeds the total data transmission rate threshold, then the data transmission rate of sensor data types and instant messaging data types will be limited.

[0009] Furthermore, if the current data transmission rate requirement exceeds the total data transmission rate threshold, then limiting the data transmission rate of sensor data types and instant messaging data types includes the following steps: Prioritize the transmission of instant messaging data; If the data transmission rate requirement of the current instant messaging data type is less than or equal to the maximum data transmission rate threshold of the instant messaging data type, then maintain the data transmission rate of the current instant messaging data type and reduce the data transmission rate of the current sensor data type. If the data transmission rate requirement for instant messaging data types increases subsequently, the data transmission rate for instant messaging data types will be increased accordingly, while the data transmission rate for sensor data types will be decreased, until the data transmission rate for instant messaging data types increases to the maximum threshold and the data transmission rate for sensor data types decreases to the minimum threshold. This achieves dynamic adjustment of the data transmission rates for different data types, prioritizing the real-time interaction needs of emergency instant messaging within limited bandwidth resources.

[0010] Furthermore, the satellite-to-ground communication network selects a satellite-to-ground communication link based on data type, and transmits data from the terrestrial communication network to the low-Earth orbit satellite communication network through intelligent communication relay base stations, including the following steps: If there are both open and closed satellite communication links, the open satellite communication link is selected to transmit instant messaging data, and the closed satellite communication link is selected to transmit sensor data. If only a satellite communication link with no gaps exists and its available communication margin is less than the current data transmission rate, then data of instant messaging type will be transmitted first, followed by data of sensor type; if only a satellite communication link with no gaps exists and its available communication margin is greater than or equal to the current data transmission rate, then data of instant messaging type and data of sensor type will be transmitted simultaneously. If there is only an empty satellite communication link, the data of the instant messaging data type will be cached until the next time the satellite with the empty link enters the coverage area. Once the satellite with the empty link enters the coverage area, it will be transmitted in batches. The data of the sensor data type will be transmitted sequentially in the current satellite communication window according to the collection time order. This ensures the continuity of instant messaging data transmission and avoids delays in critical emergency communication commands due to communication interruption.

[0011] Furthermore, regarding whether the original communication coverage area based on the low-Earth orbit satellite communication network passes through the geographical location of the emergency command center to select a data relay transmission method to transmit data to the emergency command center, the following steps are included: If the original communication coverage of the low-Earth orbit satellite communication network passes through the geographical location of the emergency command center, then the original low-Earth orbit satellite relay transmission method will be selected to transmit the data to the emergency command center through the low-Earth orbit satellite communication network. If the original communication coverage of the low-Earth orbit satellite communication network does not pass through the geographical location of the emergency command center, and the geographical location of the emergency command center is close to the original communication coverage, then the beam adjustment relay transmission method is selected to adjust the beam direction of the low-Earth orbit satellite so that its communication coverage passes through the geographical location of the emergency command center and transmits the data to the emergency command center. If the original communication coverage of the low-Earth orbit satellite communication network does not pass through the geographical location of the emergency command center, and the geographical location of the emergency command center is not close to the original communication coverage, then the multi-satellite collaborative relay transmission method is selected to first transmit the data from the low-Earth orbit satellite communication network to low-Earth orbit satellites in other orbits, and then relay the data to the emergency command center.

[0012] Furthermore, the emergency command center generates an emergency plan based on the received data and transmits it to the designated intelligent display terminal along the original data transmission path, including the following steps: Feature extraction processing is performed on the received instant messaging data and sensor data to obtain the feature extraction processing results; Based on the feature extraction results, a real-time disaster situation map is constructed, and it is matched with a pre-set disaster relief plan database to select emergency plans that are suitable for the current situation. The generated emergency response plan is forwarded layer by layer in reverse along the original data transmission path, and finally transmitted to the designated intelligent display terminal at the disaster site, so that on-site rescue personnel can obtain command instructions in a timely manner to carry out rescue work.

[0013] The second aspect of this application provides a blind zone and emergency communication system based on low-Earth orbit satellites, including: The emergency communication network construction unit is used to build an emergency communication network architecture based on geographical location data of natural disaster areas and low-orbit satellite operation data; The first data processing unit is used to adaptively adjust the data transmission rate of different data types based on the number of instant messaging devices in data transmission state. The second data processing unit is used to select the space-to-ground communication link based on the data type and transmit the data from the ground communication network to the low-orbit satellite communication network through the intelligent communication relay base station. The third data processing unit is used to select a data relay transmission method to transmit data to the emergency command center based on whether the original communication coverage of the low-orbit satellite communication network passes through the geographical location of the emergency command center. The emergency command center is used to generate emergency plans based on the received data and transmit them to designated intelligent display terminals along the original data transmission path.

[0014] The beneficial effects of this application are: it achieves stable and continuous emergency communication coverage in communication blind spots after a disaster; by combining the technical characteristics of low-orbit satellites, it dynamically adjusts the allocation of communication resources according to the transmission needs of different data types at the disaster site, prioritizes the transmission bandwidth needs of real-time emergency command communication, avoids the impact of communication gaps caused by low-orbit satellite transits on core emergency communications, and rationally utilizes satellite links with gaps to transmit non-real-time sensor data, thereby improving the utilization efficiency of emergency communication resources. It solves the problems of difficult communication coverage in large-scale blind spots after the destruction of existing ground communications and the inability of existing satellite communication systems to adapt to the emergency communication needs at disaster sites, and can provide stable and efficient emergency communication support for natural disaster emergency rescue. Attached Figure Description

[0015] To more clearly illustrate the technical solutions in the embodiments of the present invention or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0016] Figure 1 This is a schematic diagram illustrating the steps of a method for constructing blind zone and emergency communication based on low-orbit satellites according to the present invention.

[0017] Figure 2 This is a schematic diagram of the framework for constructing a blind zone and emergency communication system based on low-orbit satellites according to the present invention. Detailed Implementation

[0018] The embodiments of the present invention will now be described in detail with reference to the accompanying drawings.

[0019] The following specific examples illustrate the implementation of the present invention. Those skilled in the art can easily understand other advantages and effects of the present invention from the content disclosed in this specification. Obviously, the described embodiments are only a part of the embodiments of the present invention, and not all of them. The present invention can also be implemented or applied through other different specific embodiments, and the details in this specification can also be modified or changed based on different viewpoints and applications without departing from the spirit of the present invention. It should be noted that, in the absence of conflict, the following embodiments and features in the embodiments can be combined with each other. All other embodiments obtained by those skilled in the art based on the embodiments of the present invention without creative effort are within the scope of protection of the present invention.

[0020] Example 1 A method for constructing blind zone and emergency communication based on low-Earth orbit satellites includes the following steps: S101. Based on geographical location data of natural disaster areas and low-orbit satellite operation data, construct an emergency communication network architecture, which includes a terrestrial communication network, a low-orbit satellite communication network, and a space-to-ground communication network. The process involves acquiring geographic location data and low-Earth orbit (LEO) satellite operational data for the natural disaster area. The geographic location data includes the area's latitude and longitude range, geographical location, and topographic features. The LEO satellite operational data includes the number of LEO satellite orbits, the number of satellites in the i-th LEO orbit, and the communication range traversed by the LEO satellites. Based on the geographic location of the natural disaster area and the communication range of mobile communication terminals, the deployment locations of all mobile communication terminals within the natural disaster area are determined and used to establish a terrestrial communication network to achieve complete communication coverage of the natural disaster area. Target LEO satellite orbits and satellites are selected from the LEO satellite operational data based on the geographic location data of the natural disaster area. A LEO satellite communication network is then established based on the selected target LEO satellite orbits and satellites. Intelligent communication relay base stations are used to establish communication connections with both the LEO satellite communication network and the terrestrial communication network to build a space-to-ground communication network, achieving emergency communication coverage of the entire natural disaster area.

[0021] Based on the geographical location of the natural disaster area, the target low-Earth orbit satellite orbit, and the low-Earth orbit satellites, determine the transit communication time of the j-th satellite in the i-th low-Earth orbit (denoted as ). The flight time required for the (j+1)th satellite in the same low orbit to reach the position of the jth satellite (denoted as ) Based on transit communication time (denoted as ). ), required flight time (denoted as To construct different sets of low-Earth orbit (LEO) satellite communication links, based on the transit communication time and required flight time, determine whether there is a window of no communication connection between the LEO satellite and the ground network in the i-th LEO (LEO satellite communication link set) and its duration. Prioritize the i-th LEO without a window of no communication connection for real-time communication data transmission, and use the LEOs with a window of no communication connection for sensor data transmission.

[0022] Based on geographical location data of natural disaster areas and low-Earth orbit satellite operation data, the construction of an emergency communication network architecture includes the following steps: A terrestrial communication network will be built based on the geographical location data of natural disaster areas and the communication range of mobile communication terminals to achieve complete communication coverage of natural disaster areas; Based on the geographical location data of natural disaster areas, target low-Earth orbit satellite orbits and low-Earth orbit satellites are selected from low-Earth orbit satellite operation data, and a low-Earth orbit satellite communication network is built. A satellite-to-ground communication network is established by connecting the low-orbit satellite communication network with the terrestrial communication network through intelligent communication relay base stations.

[0023] Building a terrestrial communication network based on geographical location data of natural disaster areas and the communication range of mobile communication terminals includes the following steps: Based on the geographical location data of natural disaster areas and the communication range of mobile communication terminals, determine the installation locations of all mobile communication terminals within the natural disaster areas; Once the mobile communication terminal arrives at the designated location, it constructs a terrestrial communication network based on a self-organizing network approach. The terrestrial communication network is configured to adaptively adjust the data transmission rate of different data types based on the number of instant messaging devices in data transmission state. The data types include instant messaging data types and sensor data types.

[0024] It should be noted that the data types transmitted by instant messaging devices are classified as instant messaging data types, while the data types transmitted by data acquisition devices are classified as sensor data types. Instant messaging devices include voice communication mobile terminals and video communication mobile terminals, while data acquisition devices include temperature and humidity acquisition units and image acquisition units.

[0025] Based on geographical location data of natural disaster areas, the process of selecting target low-Earth orbit (LEO) satellite orbits and LEO satellites from LEO satellite operational data, and then establishing a LEO satellite communication network includes the following steps: Based on the selected target low-Earth orbit satellites, the satellites are grouped according to their orbits, with each group corresponding to a low-Earth orbit satellite orbit. Calculate the satellite transit interval for each low orbit and determine if there is a communication gap in that low orbit. If a communication gap exists, record the start and end times of the low-Earth orbit communication gap, as well as the total duration of the communication gap; If there is no communication gap, the low orbit is marked as a continuously connected orbit.

[0026] After completing the grouping and determination of all the target low-Earth orbit satellite orbits obtained from the screening, optionally, continuously connected orbits are assigned to instant messaging data types for data transmission, and orbits with communication gaps are assigned to sensor data types for data transmission. In this way, the corresponding orbit resources are adapted according to the transmission requirements of different data types, so as to ensure the stability and transmission efficiency of emergency communication under the condition of limited satellite resources and avoid the problem of interruption and lag of instant messaging data due to communication gaps.

[0027] S102. The terrestrial communication network adaptively adjusts the data transmission rate of different data types based on the number of instant messaging devices in data transmission state. When the number of online instant messaging devices increases, the data transmission rate of instant messaging data types is increased, while the data transmission rate of sensor data types is correspondingly reduced, and the bandwidth of sensor data types is always not lower than the preset minimum threshold. When the number of online instant messaging devices decreases, the data transmission rate of instant messaging data types is reduced, and the freed-up data transmission rate is allocated to sensor data types to accelerate the acquisition and transmission speed of sensor data. In this way, within the limited communication bandwidth, priority is given to ensuring the critical instant messaging needs in emergency scenarios, while also taking into account the transmission needs of sensor monitoring data, thus avoiding the waste of bandwidth resources.

[0028] The terrestrial communication network adaptively adjusts the data transmission rate of different data types based on the number of instant messaging devices in data transmission state, including the following steps: Based on the number of instant messaging devices in data transmission state, determine the data transmission rate requirement for the current instant messaging data type. Based on the number of data acquisition devices in data transmission state, determine the data transmission rate requirement of the current sensor data type, and set the minimum data transmission rate threshold for sensor data type and the maximum data transmission rate threshold for instant messaging data type to ensure the minimum sensor data transmission requirement. Based on the data transmission rate requirements of the current instant messaging data type and the data transmission rate requirements of the current sensor data type, determine the current data transmission rate requirement. If the current data transmission rate requirement is less than or equal to the total data transmission rate threshold, then no data transmission rate limit will be imposed on the data transmission rate of sensor data types and the data transmission rate of instant messaging data types. If the current data transmission rate requirement exceeds the total data transmission rate threshold, then the data transmission rate of sensor data types and instant messaging data types will be limited.

[0029] If the current data transmission rate requirement exceeds the total data transmission rate threshold, then limiting the data transmission rate of sensor data types and instant messaging data types involves the following steps: Prioritize the transmission of instant messaging data; If the data transmission rate requirement of the current instant messaging data type is less than or equal to the maximum data transmission rate threshold of the instant messaging data type, then maintain the data transmission rate of the current instant messaging data type and reduce the data transmission rate of the current sensor data type. If the data transmission rate requirement for instant messaging data types increases subsequently, the data transmission rate for instant messaging data types will be increased accordingly, while the data transmission rate for sensor data types will be decreased, until the data transmission rate for instant messaging data types increases to the maximum threshold and the data transmission rate for sensor data types decreases to the minimum threshold. This achieves dynamic adjustment of the data transmission rates for different data types, prioritizing the real-time interaction needs of emergency instant messaging within limited bandwidth resources.

[0030] S103, the satellite-to-ground communication network selects the satellite-to-ground communication link based on the data type, and transmits data from the ground communication network to the low-Earth orbit satellite communication network through the intelligent communication relay base station; The satellite-to-ground communication network selects communication links based on data type. These links include windowless and windowed satellite communication links. Windowless links are constructed from continuously connected low-Earth orbit (LEO) orbits with no communication gaps, while windowed links are constructed from LEO orbits with communication gaps. Preferably, when satellite-to-ground communication link resources are limited, instant messaging data types are transmitted via windowless links, while sensor data types are transmitted via windowed links. The intelligent communication relay base station performs relay caching on the data. When a windowed satellite communication link is in a communication gap, sensor data is first stored in the local cache of the intelligent communication relay base station. Once communication on that link is restored, the cached sensor data is transmitted in batches to the LEO satellite communication network, thus adapting to the transmission needs of different data types and making full use of existing satellite orbit resources. By selecting the satellite-to-ground communication link based on the data type, and transmitting data from the terrestrial communication network to the low-Earth orbit satellite communication network through intelligent communication relay base stations, communication congestion caused by different types of data competing for link resources is avoided. At the same time, with limited low-Earth orbit satellite communication resources, uninterrupted emergency communication across the entire region is guaranteed, solving the problem of unstable emergency communication coverage in large-scale natural disaster areas after the complete destruction of conventional terrestrial communication.

[0031] The satellite-to-ground communication network selects a satellite-to-ground communication link based on data type, and transmits data from the terrestrial communication network to the low-Earth orbit satellite communication network through intelligent communication relay base stations, including the following steps: If there are both open and closed satellite communication links, the open satellite communication link is selected to transmit instant messaging data, and the closed satellite communication link is selected to transmit sensor data. If only a satellite communication link with no gaps exists and its available communication margin is less than the current data transmission rate, then data of instant messaging type will be transmitted first, followed by data of sensor type; if only a satellite communication link with no gaps exists and its available communication margin is greater than or equal to the current data transmission rate, then data of instant messaging type and data of sensor type will be transmitted simultaneously. If there is only an empty satellite communication link, the data of the instant messaging data type will be cached until the next time the satellite with the empty link enters the coverage area. Once the satellite with the empty link enters the coverage area, it will be transmitted in batches. The data of the sensor data type will be transmitted sequentially in the current satellite communication window according to the collection time order. This ensures the continuity of instant messaging data transmission and avoids delays in critical emergency communication commands due to communication interruption.

[0032] S104. Based on the original communication coverage area of ​​the low-orbit satellite communication network, whether the data is transmitted to the emergency command center through the geographical location of the emergency command center by selecting a data relay transmission method; Based on whether the original communication coverage of the target low-Earth orbit (LEO) satellite communication network constructed by the LEO satellites, selected in step S101, passes through the emergency command center, a data relay transmission method is selected and the data is transmitted to the emergency command center. Data relay transmission methods include multi-satellite collaborative relay transmission, beam adjustment relay transmission, and the original LEO satellite relay transmission method. Multi-satellite collaborative relay transmission is used when LEO satellites in the disaster area do not directly pass through the emergency command center, and the distance between them is too great to achieve direct transmission by adjusting beam coverage. Data forwarding is completed through inter-satellite links between LEO satellites in different orbits. Utilizing the global coverage of LEO satellites, data is forwarded sequentially to LEO satellites covering the emergency command center, and then transmitted downlink from those satellites to the emergency command center. Beam adjustment relay transmission is used when LEO satellites in the disaster area do not directly pass through the emergency command center, but the distance between them is within the adjustable beam coverage range. By adjusting the downlink beam direction of the LEO satellite, data is directly transmitted to the satellite receiving station set up at the emergency command center, without needing to pass through multiple satellites, thus reducing transmission delay. The original low-Earth orbit (LEO) satellite relay transmission method is used when the original communication coverage area of ​​the LEO satellite transmitting data already passes through the emergency command center. In this method, the LEO satellite directly transmits downlink data to the emergency command center without additional adjustments or relays, minimizing communication transmission complexity and ensuring data transmission efficiency. By selecting the data relay transmission method based on whether the original communication coverage area of ​​the LEO satellite communication network passes through the geographical location of the emergency command center, data is transmitted to the emergency command center. This allows for matching and adapting relay schemes to different transmission scenarios, minimizing transmission latency and complexity while ensuring accurate and timely data transmission. It fully utilizes the communication resources of LEO satellites, ensuring that the emergency command center can obtain timely and continuous communication and sensor data from the disaster site after a natural disaster, supporting emergency rescue command and decision-making.

[0033] Based on the original communication coverage area of ​​the low-Earth orbit satellite communication network, whether it passes through the geographical location of the emergency command center, the data relay transmission method is selected to transmit data to the emergency command center, including the following steps: If the original communication coverage of the low-Earth orbit satellite communication network passes through the geographical location of the emergency command center, then the original low-Earth orbit satellite relay transmission method will be selected to transmit the data to the emergency command center through the low-Earth orbit satellite communication network. If the original communication coverage of the low-Earth orbit satellite communication network does not pass through the geographical location of the emergency command center, and the geographical location of the emergency command center is close to the original communication coverage, then the beam adjustment relay transmission method is selected to adjust the beam direction of the low-Earth orbit satellite so that its communication coverage passes through the geographical location of the emergency command center and transmits the data to the emergency command center. If the original communication coverage of the low-Earth orbit satellite communication network does not pass through the geographical location of the emergency command center, and the geographical location of the emergency command center is not close to the original communication coverage, then the multi-satellite collaborative relay transmission method is selected to first transmit the data from the low-Earth orbit satellite communication network to low-Earth orbit satellites in other orbits, and then relay the data to the emergency command center.

[0034] S105. The emergency command center generates an emergency plan based on the received data and transmits it to the designated intelligent display terminal along the original data transmission path. The emergency command center processes the received data, performing feature extraction to obtain the results. Feature extraction may include extracting keywords from text and voice content in instant messaging data to identify core rescue information such as emergency needs, personnel locations, and disaster risks; and extracting features from sensor data, including temperature and humidity, and image content, to identify environmental parameters at the disaster site, the distribution of damaged buildings, and the locations of trapped personnel. All extracted features are integrated to construct a real-time disaster situation map, which is then matched against a pre-set disaster relief plan database to select emergency plans suitable for the current situation. These emergency plans are then transmitted back to intelligent display terminals at the disaster site via the original data transmission path for on-site personnel to review and execute, thus achieving a complete closed-loop emergency communication transmission system.

[0035] The emergency command center generates an emergency plan based on the received data and transmits it to the designated smart display terminal along the original data transmission path, including the following steps: Feature extraction processing is performed on the received instant messaging data and sensor data to obtain the feature extraction processing results; Based on the feature extraction results, a real-time disaster situation map is constructed, and it is matched with a pre-set disaster relief plan database to select emergency plans that are suitable for the current situation. The generated emergency response plan is forwarded layer by layer in reverse along the original data transmission path, and finally transmitted to the designated intelligent display terminal at the disaster site, so that on-site rescue personnel can obtain command instructions in a timely manner to carry out rescue work.

[0036] Example 2 The above is a method for constructing blind zones and emergency communication based on low-Earth orbit satellites provided in the embodiments of this application. The following is a system for constructing blind zones and emergency communication based on low-Earth orbit satellites provided in the embodiments of this application.

[0037] Reference Figure 2 A blind zone and emergency communication system based on low-Earth orbit satellites includes: The emergency communication network construction unit is used to build an emergency communication network architecture based on geographical location data of natural disaster areas and low-orbit satellite operation data; The first data processing unit is used to adaptively adjust the data transmission rate of different data types based on the number of instant messaging devices in data transmission state. The second data processing unit is used to select the space-to-ground communication link based on the data type and transmit the data from the ground communication network to the low-orbit satellite communication network through the intelligent communication relay base station. The third data processing unit is used to select a data relay transmission method to transmit data to the emergency command center based on whether the original communication coverage of the low-orbit satellite communication network passes through the geographical location of the emergency command center. The emergency command center is used to generate emergency plans based on the received data and transmit them to designated intelligent display terminals along the original data transmission path.

[0038] The above-described embodiments are only used to illustrate the technical solutions of this application, and are not intended to limit them. Although this application has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that modifications can still be made to the technical solutions described in the foregoing embodiments, or equivalent substitutions can be made to some of the technical features. Such modifications or substitutions do not cause the essence of the corresponding technical solutions to deviate from the spirit and scope of the technical solutions of the embodiments of this application.

Claims

1. A method for constructing blind zone and emergency communication based on low-Earth orbit satellites, characterized in that, Includes the following steps: S101. Based on geographical location data of natural disaster areas and low-orbit satellite operation data, construct an emergency communication network architecture, which includes a terrestrial communication network, a low-orbit satellite communication network, and a space-to-ground communication network. S102. The terrestrial communication network adaptively adjusts the data transmission rate of different data types based on the number of instant messaging devices in data transmission state. S103, the satellite-to-ground communication network selects the satellite-to-ground communication link based on the data type, and transmits data from the ground communication network to the low-Earth orbit satellite communication network through the intelligent communication relay base station; S104. Based on the original communication coverage area of ​​the low-orbit satellite communication network, whether the data is transmitted to the emergency command center through the geographical location of the emergency command center by selecting a data relay transmission method; S105. The emergency command center generates an emergency plan based on the received data and transmits it to the designated intelligent display terminal along the original data transmission path.

2. The method for constructing blind zone and emergency communication based on low-Earth orbit satellites according to claim 1, characterized in that, Step S101 includes the following steps: A terrestrial communication network will be built based on the geographical location data of natural disaster areas and the communication range of mobile communication terminals to achieve complete communication coverage of natural disaster areas; Based on the geographical location data of natural disaster areas, target low-Earth orbit satellite orbits and low-Earth orbit satellites are selected from low-Earth orbit satellite operation data, and a low-Earth orbit satellite communication network is built. A satellite-to-ground communication network is established by connecting the low-orbit satellite communication network with the terrestrial communication network through intelligent communication relay base stations.

3. The method for constructing blind zone and emergency communication based on low-Earth orbit satellites according to claim 2, characterized in that, The establishment of a terrestrial communication network based on geographical location data of natural disaster areas and the communication range of mobile communication terminals includes the following steps: Based on the geographical location data of natural disaster areas and the communication range of mobile communication terminals, determine the installation locations of all mobile communication terminals within the natural disaster areas; Once the mobile communication terminal arrives at the designated location, it constructs a terrestrial communication network based on a self-organizing network approach. The terrestrial communication network is configured to adaptively adjust the data transmission rate of different data types based on the number of instant messaging devices in data transmission state. The data types include instant messaging data types and sensor data types.

4. The method for constructing blind zone and emergency communication based on low-Earth orbit satellites according to claim 2, characterized in that, The process of selecting target low-Earth orbit (LEO) satellite orbits and satellites from LEO satellite operational data based on geographical location data of natural disaster areas, and then establishing a LEO satellite communication network, includes the following steps: Based on the selected target low-Earth orbit satellites, the satellites are grouped according to their orbits, with each group corresponding to a low-Earth orbit satellite orbit. Calculate the satellite transit interval for each low orbit and determine if there is a communication gap in that low orbit. If a communication gap exists, record the start and end times of the low-Earth orbit communication gap, as well as the total duration of the communication gap; If there is no communication gap, the low orbit is marked as a continuously connected orbit.

5. The method for constructing blind zone and emergency communication based on low-Earth orbit satellites according to claim 1, characterized in that, Step S102 includes the following steps: Based on the number of instant messaging devices in data transmission state, determine the data transmission rate requirement for the current instant messaging data type. Based on the number of data acquisition devices in data transmission state, determine the data transmission rate requirement of the current sensor data type, and set the minimum data transmission rate threshold for sensor data type and the maximum data transmission rate threshold for instant messaging data type to ensure the minimum sensor data transmission requirement. Based on the data transmission rate requirements of the current instant messaging data type and the data transmission rate requirements of the current sensor data type, determine the current data transmission rate requirement. If the current data transmission rate requirement is less than or equal to the total data transmission rate threshold, then no data transmission rate limit will be imposed on the data transmission rate of sensor data types and the data transmission rate of instant messaging data types. If the current data transmission rate requirement exceeds the total data transmission rate threshold, then the data transmission rate of sensor data types and instant messaging data types will be limited.

6. The method for constructing blind zone and emergency communication based on low-Earth orbit satellites according to claim 5, characterized in that, The step of limiting the data transmission rate of sensor data types and instant messaging data types if the current data transmission rate requirement exceeds the total data transmission rate threshold includes the following steps: Prioritize the transmission of instant messaging data; If the data transmission rate requirement of the current instant messaging data type is less than or equal to the maximum data transmission rate threshold of the instant messaging data type, then maintain the data transmission rate of the current instant messaging data type and reduce the data transmission rate of the current sensor data type. If the data transmission rate requirement for instant messaging data types increases subsequently, the data transmission rate for instant messaging data types will be increased accordingly, and the data transmission rate for sensor data types will be decreased, until the data transmission rate for instant messaging data types increases to the maximum threshold and the data transmission rate for sensor data types decreases to the minimum threshold.

7. The method for constructing blind zone and emergency communication based on low-Earth orbit satellites according to claim 1, characterized in that, Step S103 includes the following steps: If there are both open and closed satellite communication links, the open satellite communication link is selected to transmit instant messaging data, and the closed satellite communication link is selected to transmit sensor data. If only a satellite communication link with no gaps exists and its available communication margin is less than the current data transmission rate, then data of instant messaging type will be transmitted first, followed by data of sensor type; if only a satellite communication link with no gaps exists and its available communication margin is greater than or equal to the current data transmission rate, then data of instant messaging type and data of sensor type will be transmitted simultaneously. If there is only an empty satellite communication link, the data of the instant messaging data type will be cached until the next time the satellite with the empty link enters the coverage area. The data will then be transmitted in batches after the satellite with the empty link enters the coverage area. The data of the sensor data type will be transmitted sequentially in the current satellite communication window according to the collection time.

8. The method for constructing blind zone and emergency communication based on low-Earth orbit satellites according to claim 1, characterized in that, Step S104 includes the following steps: If the original communication coverage of the low-Earth orbit satellite communication network passes through the geographical location of the emergency command center, then the original low-Earth orbit satellite relay transmission method will be selected to transmit the data to the emergency command center through the low-Earth orbit satellite communication network. If the original communication coverage of the low-Earth orbit satellite communication network does not pass through the geographical location of the emergency command center, and the geographical location of the emergency command center is close to the original communication coverage, then the beam adjustment relay transmission method is selected to adjust the beam direction of the low-Earth orbit satellite so that its communication coverage passes through the geographical location of the emergency command center and transmits the data to the emergency command center. If the original communication coverage of the low-Earth orbit satellite communication network does not pass through the geographical location of the emergency command center, and the geographical location of the emergency command center is not close to the original communication coverage, then the multi-satellite collaborative relay transmission method is selected to first transmit the data from the low-Earth orbit satellite communication network to low-Earth orbit satellites in other orbits, and then relay the data to the emergency command center.

9. The method for constructing blind zone and emergency communication based on low-Earth orbit satellites according to claim 1, characterized in that, Step S105 includes the following steps: Feature extraction processing is performed on the received instant messaging data and sensor data to obtain the feature extraction processing results; Based on the feature extraction results, a real-time disaster situation map is constructed, and it is matched with a pre-set disaster relief plan database to select emergency plans that are suitable for the current situation. The generated emergency response plan is forwarded layer by layer in reverse along the original data transmission path, and finally transmitted to the designated intelligent display terminal at the disaster site.

10. A blind zone and emergency communication system based on low-Earth orbit satellites, used to implement the blind zone and emergency communication method based on low-Earth orbit satellites as described in any one of claims 1-9, characterized in that, include: The emergency communication network construction unit is used to build an emergency communication network architecture based on geographical location data of natural disaster areas and low-orbit satellite operation data; The first data processing unit is used to adaptively adjust the data transmission rate of different data types based on the number of instant messaging devices in data transmission state. The second data processing unit is used to select the space-to-ground communication link based on the data type and transmit the data from the ground communication network to the low-orbit satellite communication network through the intelligent communication relay base station. The third data processing unit is used to select a data relay transmission method to transmit data to the emergency command center based on whether the original communication coverage of the low-orbit satellite communication network passes through the geographical location of the emergency command center. The emergency command center is used to generate emergency plans based on the received data and transmit them to designated intelligent display terminals along the original data transmission path.

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