1046 results about "Satellite network" patented technology

The invention relates to the technical field of satellite communication, in particular to a high-orbit and low-orbit satellite communication resource scheduling method and system, which collects real-time state information of high-orbit and low-orbit satellites, performs digital simulation of a satellite network based on the real-time information, constructs a satellite network management model and predicts satellite trajectory change. The method comprises the following steps: performing multi-dimensional evaluation on a satellite network management model by using a pre-constructed network evaluation framework, generating cross-orbit link evaluation information, analyzing parameters such as link quality and bandwidth, obtaining current service demand information, analyzing a communication resource allocation strategy in combination with a cross-orbit link evaluation result, and formulating a resource scheduling strategy according to strategy analysis. And a high-orbit and low-orbit satellite communication network is constructed through execution of a hierarchical network management mechanism and a cross-orbit data transmission protocol.

An intention-driven low-orbit satellite network SRv6 routing management and control method comprises the following steps: step 1, receiving and analyzing a user service demand from an application layer, and generating a corresponding intention label according to a service type; step 2, collecting state information of a satellite network in real time, tracking and recording satellite node position change and link state conversion, and establishing a complete network state database; 3, calculating a routing path meeting the service quality requirement by adopting an improved breadth-first search algorithm; 4, monitoring the state change of the inter-satellite link in real time; step 5, continuously monitoring fault events in the network, immediately starting a pre-calculated standby path when a fault is detected, updating a corresponding SRv6SID list, and performing rapid path switching; and step 6, dynamically adjusting the network flow. The method not only can adapt to the dynamic characteristics of the low earth orbit satellite network, but also can effectively meet the differentiated service requirements, and has the rapid fault recovery and load balancing capability.

The invention discloses a multi-satellite network converged communication link optimization and anti-interference method, which belongs to the technical field of wireless communication networks, and comprises the following steps: acquiring Doppler frequency shift parameters of satellite nodes, adjacent satellite radiation quantity parameters and preset geographical shielding coefficients, and generating a link dynamic quality coefficient; constructing a dynamic topological graph according to the link dynamic quality coefficient; performing radio frequency fingerprint extraction and frequency domain waveform phase reversal processing on the detected interference signal to generate an anti-interference compensation signal; and when the link dynamic quality coefficient is greater than or equal to a preset quality threshold value, selecting a target transmission path according to the dynamic topological graph, and injecting the anti-interference compensation signal into the target transmission path. According to the invention, a mechanism of cooperation of dynamic link quality evaluation, interference fingerprint feature matching and multi-path fragmentation transmission is adopted, and real-time optimization selection of communication paths, accurate suppression of interference signals and efficient distribution of network resources can be realized in a complex air and space environment.

The invention discloses a low earth orbit satellite network digital twin drive switching optimization method and system, and relates to the technical field of inter-satellite communication, and the method comprises the steps: building a digital twin system which is synchronously evolved with a physical LEO satellite network; predicting the link quality between each candidate satellite and the user terminal in a future time window based on a digital twin system; dividing a time window into a plurality of continuous time slices, constructing a directed weighted dynamic graph model which takes a satellite-time slice as a node and takes link comprehensive utility cost as an edge weight, and searching an optimal path in the directed weighted dynamic graph model by utilizing a shortest path algorithm so as to determine an optimal switching opportunity and a target satellite sequence; the optimal switching strategy is issued to a user terminal to be executed, and a link quality prediction result is corrected in real time through a feedback mechanism of the digital twin system to form closed-loop optimization; the method can effectively meet differentiated service quality requirements in a multi-service scene, and is suitable for a high-dynamic LEO satellite communication system.

The invention discloses a predictive topology-based satellite internet deterministic routing data plane migration method, which mainly solves the problem of data packet and service interruption during satellite switching in the prior art. According to the implementation scheme, service flow terminal equipment firstly sends an access request to an entrance edge node; the entry edge node calculates a tunnel path and resource reservation according to the request, performs service identification, encapsulates various identifiers into deterministic specific segment identifiers, and encapsulates the original data packet into an SRv6 data packet based on the tunnel path and the specific segment identifiers; when the service flow is transmitted in the satellite network, if a satellite is switched, service flow tunnel migration is carried out, and when a queue data packet exists in the switched satellite, queue cache migration is carried out. According to the invention, the forwarding of the service flow in the satellite switching process is not influenced, the flow interruption or transmission error caused by lack of information pre-synchronization in the traditional satellite switching is avoided, the priority transmission of the high-priority data packet is ensured, and the method can be used for data transmission between a ground terminal and a deterministic satellite network.

The invention relates to the technical field of satellite network communication, and discloses a multi-source multi-path scheduling method for remote sensing data transmission, which comprises the following steps of: firstly, establishing an index table for remote sensing data by using a space-time name formed by a service type, an acquisition area, acquisition time, a node identifier and a data category; and the controller analyzes time and space constraints in the request, selects a plurality of source nodes meeting conditions from an index table, calculates priorities according to parameters such as residual bandwidth, round-trip delay and packet loss rate, and selects a plurality of non-overlapping high-quality paths. And then adding a service type, a path number, a path state report and a flow proportion field in the interest packet and the data packet, so that the source node sends segmented data in parallel according to a preset proportion. And the forwarding node reports the link change in real time, and the controller dynamically adjusts the path set and the shunt weight, thereby ensuring that the high-bandwidth and low-delay data transmission performance is continuously obtained in a topology and load rapid change scene.

The invention discloses an internet constellation dynamic routing optimization method and system, and the method comprises the steps: setting orbit plane parameters and satellite parameters, and carrying out the modeling of an orbit and a constellation; performing link visualization and time-varying graph generation according to ephemeris data and the constructed constellation model; defining a related space, a network and a function based on a deep reinforcement learning algorithm; and based on an MADDPG framework, introducing a multi-agent collaborative decision-making mechanism, and outputting action selection and execution results after collaborative optimization. The system comprises a model construction module, an embedding module, a reinforcement learning design module and a collaborative optimization module. By using the method, the dynamic change of the low-orbit satellite network can be effectively dealt with, satellite resources are fully utilized, and efficient and reliable communication is realized. The method can be widely applied to the field of wireless communication.

A routing method for supporting differential service requirements in a satellite internet comprises the following steps: step 1, constructing multi-dimensional network state perception as a base layer which is responsible for collecting and quantifying physical states and logic states of a satellite network in real time, and obtaining objective network states and subjective QoS (Quality of Service) requirements of services; 2, generating a nonlinear adaptive weight driven by a service as a strategy layer, mapping an objective network state and a subjective QoS (Quality of Service) demand of the service, dynamically adjusting the value orientation of routing judgment, and generating a dynamic weight; and step 3, taking the dynamic cost routing decision as an execution layer, calculating the comprehensive cost based on the dynamic weight, and executing next hop selection and path maintenance, and through cooperative work of the dynamic cost routing decision, the comprehensive cost and the next hop selection and path maintenance, realizing intelligent path selection and high-reliability transmission for different service flows in a high-dynamic and resource-limited environment of the low-orbit satellite. According to the invention, while the routing computation overhead is effectively reduced, multiple requirements of differentiated services on low time delay and high reliability can be considered.

The invention relates to a dynamic routing and flow balancing method and system for a regionalized network topology, and the method comprises the steps: dividing a satellite network into a plurality of partitions, and distributing a core node for traffic scheduling and routing calculation for each partition; each core satellite node responds to each traffic demand, and bandwidth and traffic distribution in each partition are adjusted through a multi-anchor-segment routing method and a preset linear programming model; and each satellite node dynamically adjusts the route of each traffic demand through a probability forwarding scheduling method based on geometric topology according to the relative position of the satellite node and the target node. According to the method, low delay, high bandwidth utilization rate, load balance and efficient fault recovery of the satellite network are realized through network partitioning, a multi-anchor-segment routing method and probability forwarding based on geometric topology.

The invention provides a satellite constellation network topology state rapid sensing method. A multi-dimensional physical layer monitoring module, a dynamic adaptive BFD detection mechanism, an OSPF routing protocol and a shared data exchange area of a BFD driver and an OSPF process are deployed on each satellite node. According to the method, the connectivity of inter-satellite links is monitored in real time by using a physical layer signal state monitoring technology and the rapid link state detection capability of a BFD protocol, and related nodes are immediately notified through a control message when a fault is detected; meanwhile, the detection result of the BFD is linked with an OSPF routing protocol, and instant routing recalculation is triggered, so that the routing convergence time is shortened. A cross-layer closed-loop linkage system is constructed, a physical layer senses data to dynamically regulate and control protocol layer detection parameters, and hardware acceleration is combined to realize fault detection full-process optimization, so that the fault detection and recovery speed is accelerated, the resource utilization efficiency and the overall transmission efficiency of an inter-satellite network are improved, and the fault detection and recovery efficiency is improved. And high reliability and stability of the network are ensured.

The invention discloses a heterogeneous task low orbit satellite task unloading method based on a space-time diagram attention network. The method comprises the steps of obtaining space-time diagram data related to a to-be-unloaded task; the time-space diagram data are input into a time-space conversion model, a prediction result of a subsequent network state is obtained, the time-space conversion model integrates a graph convolutional network module, a long-short-term memory network module and a multi-head attention module, the graph convolutional network module extracts spatial features of satellite network topology under each time step, and the multi-head attention module extracts the spatial features of the satellite network topology under each time step; the long-short-term memory network module captures satellite network states and time sequence dependence of task loads, and the multi-head self-attention module learns association weights among different spatial-temporal characteristics and outputs prediction results of future satellite network states; and based on the prediction result and the attribute of the to-be-unloaded task, setting an optimization objective function of an opportunity task unloading algorithm problem to determine a decision result of task unloading. According to the method, the task unloading efficiency and the resource utilization rate in the low-orbit satellite network can be remarkably improved.

The invention relates to the technical field of satellite routing, and discloses a spatial three-dimensional satellite routing method, device and system, and the method comprises the steps: constructing a spatial satellite network based on LEO, MEO and GEO three-layer satellite nodes; performing orbit mechanical prediction calculation based on a space satellite network to obtain a link state prediction matrix; inputting the link state prediction matrix into a spatial position coding processor for processing to obtain a spatial time-varying routing graph; generating a routing strategy of the satellite nodes based on the space time-varying routing graph; according to the method, global optimization of end-to-end time delay and energy consumption is achieved under the condition that the network capacity and the link availability are met, and then the cross-track data transmission efficiency is improved.

The invention discloses a large-scale low-orbit satellite network domain-division intelligent routing method, which belongs to the technical field of satellite communication, and comprises the following steps: constructing a network model based on multi-dimensional resource characteristics, and providing resource constraint conditions and space-time correlation characteristics for routing decision by combining with a regional flow prediction algorithm of an improved Transform architecture; virtual nodes and an autonomous domain are divided based on a geographic area, and a low-orbit satellite network routing process is decoupled into an intra-domain part and an inter-domain part; a multi-agent deep Q network is adopted in a domain, a sum tree mechanism-based deep Q network is adopted between domains, a routing algorithm and a resource scheduling algorithm are respectively designed, and a domain intelligent routing system with flexibility and expandability is constructed through hierarchical routing and resource decoupling scheduling. According to the method, the service capability of the low earth orbit satellite network in extreme scenes such as topology high-frequency change, strict resource limitation and traffic space-time mutation is remarkably enhanced, and a high-reliability and low-delay routing solution is provided for space-ground integrated communication, emergency disaster early warning and global real-time data transmission.

The invention discloses an access authentication method and device, a satellite network system and a storage medium. The method comprises the following steps: receiving an authentication request containing an access request plaintext of a user terminal sent by at least one first node in a previous layer of a network node through a non-secure channel; performing multiple verification on each received authentication request; wherein the multiple verifications comprise verifying the timeliness and the non-tampering property of the authentication request received by the network node, and verifying the legality of each node in the access request path before the access request plaintext reaches the network node; and aggregating all the authentication requests passing the multiple verifications into a new authentication request, and sending the new authentication request to a second node in the next layer of the network node until the request plaintext reaches the network control center, so that the network control center generates unified authentication response information for all the user terminals corresponding to the authentication requests passing the multiple verifications in the network control center. And the session keys are distributed to the corresponding user terminals, so that the corresponding user terminals generate the session keys.

The invention discloses a hybrid in-band telemetering system and method for a giant constellation satellite network, and the method comprises the steps: firstly determining a detection node through a central controller, and building a communication channel; secondly, the central controller issues a telemetering task, the detection node constructs a detection packet active period broadcast, the forwarding node modifies and forwards the detection packet, and finally the detection node uploads the detection packet containing telemetering data to the central controller; in the process, the forwarding node performs periodic self-inspection, and processes telemetering abnormal conditions through a self-inspection packet and election of a temporary detection node; and finally, the central controller analyzes the detection packet to obtain the state information of each link, and the telemetering task is completed.

The invention provides an emergency response terminal system with image data return capability, which relates to the technical field of emergency response terminals and comprises an emergency response terminal management subsystem, an emergency response terminal, a multi-mode communication network, an image data return channel and an equipment state monitoring system. The emergency call terminal management subsystem is deployed on an emergency management platform and is used for generating and auditing an early warning task, dynamically selecting a communication link, interacting with a terminal through a satellite network and receiving a field image and equipment state data returned by the terminal; through the satellite, Beidou and 4 / 5G multi-link redundancy design, it is ensured that early warning information can be reached under the three-disconnection scene of network disconnection, power failure and disconnection, the problem of communication failure of a traditional system is solved, low-delay and wide-coverage transmission of the early warning information is achieved, the encrypted image return function is adopted for providing real-time disaster situation pictures for a command center, the rescue decision accuracy is improved, and the rescue cost is reduced. And the decision support capability is improved.

The invention belongs to the technical field of satellite communication, and provides a distributed low earth orbit satellite inter-satellite routing method and device based on a minimum hop count path. The method comprises the following steps of: 1, constructing a low earth orbit satellite inter-satellite network with a topological structure, mapping the dynamically changed low earth orbit satellite inter-satellite network into a logic static network by utilizing a virtual node method, and determining the positions of a source satellite node and a target satellite node of a data packet to be forwarded in the logic static network; 2, determining a minimum hop count path and a path selection domain based on the positions of the source satellite node and the target satellite node; and step 3, starting from the source satellite node, gradually selecting a next-hop routing node of the data packet to be forwarded in the path selection domain according to the load state and survival probability of adjacent routing nodes until the next-hop routing node coincides with the target satellite node. According to the method and the device provided by the invention, the data transmission efficiency and reliability can be improved.

The invention relates to a computing resource collaborative deployment strategy for a satellite-ground fusion network. The computing resource collaborative deployment strategy comprises the following steps: step 1, establishing a model of the satellite-ground fusion network combining a low-orbit satellite network and a ground network; 2, establishing a satellite-ground fusion network task model according to the use condition of the Internet; 3, establishing a time delay model by considering the total propagation time delay and the total calculation time delay of tasks in the satellite-ground fusion network; step 4, considering energy consumption of a satellite edge server and energy consumption of a ground edge server in the satellite-ground fusion network, and establishing an energy consumption model; 5, establishing an optimization target by taking the time delay and the energy consumption as comprehensive indexes; and step 6, designing a QMIX-based satellite-ground fusion network computing power resource collaborative deployment strategy to dynamically realize computing resource collaborative deployment. According to the strategy, efficient cooperative utilization of satellite-ground resources can be achieved while task requirements are guaranteed, and good generalization ability and engineering practical value are achieved.

The invention discloses a self-adaptive coding modulation method and system for relieving sun-borne interference in an ultra-dense low-orbit satellite network, and aims to improve the reliability and the spectrum utilization rate of satellite network communication. The method specifically comprises the following steps: modeling satellite-ground and inter-satellite communication links of the ultra-dense low-orbit satellite network, and modeling and calculating time generated by the sun and interference to the low-orbit satellite network; the ground station estimates and predicts the satellite-ground channel state, and returns the predicted SNR to the satellite; and according to the SNR returned by the ground station and the SNR generated by the sun, a deep reinforcement learning method is adopted to select a coding modulation scheme to perform downlink data transmission, and whether a lower satellite is selected to perform data unloading and then transmit the data to the ground station is determined. Simulation results show that the bit error rate of the ultra-dense low-orbit satellite network can be effectively reduced, the spectrum utilization rate can be remarkably improved, real-time response and efficient resistance to sun interference can be achieved, the satellite calculation load can be reduced, the comprehensive performance of the system can be improved, and the method has high practical application value.

The system connects a wireless device to a non-terrestrial communication network from a terrestrial communication network such that a wireless communication service is provided by the non-terrestrial communication network. The system pairs with a secondary device configured to collect data related to a physiological condition of a user of the wireless device. The system collects mobility management event data when the wireless device connects to the non-terrestrial communication network and when the wireless device enters a different tracking area. The system receives data related to the physiological condition of the user of the wireless device. The wireless device transmits the physiological data when the wireless device enters a new tracking area. The system determines a state of emergency based on the mobility management event data and data related to the physiological condition of the user of the wireless device. The system causes the non-terrestrial network to notify an emergency service.

A communication method and a related device, applicable to a non-terrestrial network (NTN) communication scenario such as a satellite network. In the method, a terminal device receives first information sent by a network device, where the first information includes N pieces of configuration information, the N pieces of configuration information are respectively used to configure N communication resources, and N is an integer greater than 1; the terminal device receives second information sent by the network device, where the second information indicates M communication resources in the N communication resources, and M is a positive integer less than or equal to N; and the terminal device measures at least one of the M communication resources.

The invention provides a large-scale constellation network semi-physical simulation test system and method, the system comprises a constellation simulator, a satellite-borne router, ground detection equipment and a protocol conversion network bridge, a Mininet simulation platform is deployed, and dynamic topology adjustment, an OSPF dynamic routing protocol and a multi-scene test function are supported; a user can observe network topology change, route updating time and key performance indexes in real time. A semi-physical simulation architecture is realized through unified IP subnet interconnection and the same routing protocol, a space-time synchronization engine ensures that virtual and real node routing tables take effect at an appointed moment, and in combination with a protocol consistency sandbox, hidden faults caused by inconsistent behaviors of hardware and software protocol stacks are solved, and the service life of the virtual and real node routing tables is prolonged. A plurality of real nodes are accessed in a large-scale network environment, and end-to-end data transmission test, security policy verification and protocol compatibility analysis are carried out; the invention provides an efficient, flexible and reliable solution for the design, verification and optimization of the satellite network, and has a wide application prospect.

The invention discloses a satellite measurement and control remote sensing integrated task scheduling method and system, and mainly solves the problems of high failure rate of separation of measurement and control and remote sensing tasks, low scheduling efficiency and the like in the prior art. According to the implementation scheme, a low-orbit satellite network transmits a data packet generated by a measurement and control remote sensing task and receives the data packet through a ground station; the ground control center generates a task list; the ground station equipment generates equipment information and generates available forecast information through interaction with the low earth orbit satellite network; the ground control center integrates and preprocesses the equipment information and the available forecast information, calculates a task state vector, and represents the task state vector as a Deque double-end queue; performing task planning according to the double-end queue to obtain a legal forecast selected by the intelligent agent, resolving conflicts between the legal forecast and other available forecast, and updating states of other related tasks; and repeating the task planning step until the planning of all tasks is completed, and outputting a legal task scheduling plan. The method improves the task planning efficiency and the task completion rate, and can be used for environment monitoring, weather prediction, agricultural management, and disaster early warning and reconnaissance.

The invention discloses a low earth orbit satellite network communication calculation integration method based on hierarchical convergence and a simulation implementation system. The method comprises the following steps: designing a task model based on calculation task decomposition; by taking minimization of task completion time as an optimization target, a greedy-based source node task allocation method is designed according to the number of calculation layers, the relationship between the data volume allocated to the calculation nodes and the number of calculation layers and the task completion time corresponding to the number of calculation layers, task execution segmentation is realized, calculation source nodes of each sub-task are given, and the task completion time corresponding to each sub-task is obtained. Obtaining a subtask list; a random factor exploration method is introduced to determine a forwarding node, and the method comprises the following steps: selecting a selection range of a next hop computing node according to a computing condition of a subtask, then sending a request through a client of a controller, obtaining the idle queue length of a cached to-be-selected node, and determining the forwarding node by using uniformly distributed random variables after normalization. Compared with other existing methods, the method provided by the invention obtains better system performance and embodies the anti-congestion capability.

The application provides a task scheduling and resource slicing method and system for a low-orbit satellite network, wherein the low-orbit satellite network receives a service request initiated by a terminal user; a current resource state set of each satellite is obtained, a task scheduling mechanism is constructed based on reinforcement learning to generate a task scheduling strategy according to a network state; a current resource allocation set of each satellite is obtained and a satellite resource slicing utility function is constructed; a resource slicing mechanism is constructed based on a heuristic algorithm, each satellite resource slicing candidate solution is regarded as a particle with the same electric charge, in one iteration, the fitness value of each candidate solution is calculated according to the utility function to perform evaluation, the candidate solution with a higher fitness value receives a higher electric charge, and the candidate solution with a lower fitness value receives a lower electric charge; the candidate solution is updated according to the optimal fitness value and the worst fitness value of the overall satellite, multiple iterations are performed to obtain an optimal solution, and a resource slicing strategy is generated. The method provided by the application can flexibly adjust resource allocation, improve processing efficiency and resource utilization.

The invention relates to a satellite communication encryption authentication method and system based on a dynamic key. According to the method, network topology is predicted based on satellite orbit parameters, time slices are divided to generate a dynamic key pool, a key is divided into sub-key segments, an encryption key segment set is constructed in a forward association encryption mode, and credible tracing of a key distribution path is realized in combination with pre-distribution path planning and a block chain hash verification mechanism. And the key is recombined through dynamic decryption, and a bidirectional authentication process is carried out. The problems of high key synchronization delay, easy leakage of the pre-distributed key and low verification efficiency in the high dynamic satellite network are solved, the real-time optimization of key distribution, single-point leakage risk isolation and lightweight security authentication are realized, and the forward security and anti-attack ability of a satellite communication link are significantly improved.

The invention discloses a satellite secure transmission optimization method and system based on joint anomaly detection, mainly solving the problem of low end-to-end transmission reliability under the condition of network attack in the prior art, and the implementation scheme comprises the following steps: constructing a time-varying network topology according to constellation configuration; periodically updating a network topology and a satellite neighbor node set according to the law of satellite orbital motion; the network is monitored in real time based on an anomaly detection mechanism, whether the current network is subjected to interference attack and DoS attack is judged in time, and whether the current satellite can safely transmit data is judged; and according to indexes such as node states, link hops, detection precision, node load capacity and link transmission delay, and according to a network topology and a neighbor node set at the current moment, determining a routing control optimization problem, and guiding each satellite to select an optimal transfer satellite along a transmission direction according to an optimal solution to obtain an end-to-end optimal transmission path. The method can actively trigger a detection mechanism to quickly identify abnormal nodes, obtains a safe and reliable end-to-end transmission path, and can be used for a low earth orbit satellite network.

Apparatuses, methods, and systems for managing a network demand for emergency services are disclosed. One method includes adaptively reserving, by a base station of a satellite network, reserved PRACH (physical random access channel) preambles for a plurality of reserved services, broadcasting, by the base station, the configuration, wherein a wireless device receives the reserved PRACH preambles configuration, wherein the wireless device selects a reserved service from the plurality of reserved services and transmits a PRACH preamble from the reserved preambles, and transmitting, by the base station, a message grant to the wireless device in response to the PRACH preamble, wherein the wireless device transmits to the base station a response that includes data for the selected reserved service and an identifier of the wireless device, in response to the message grant from the base station.

The invention discloses a service scheduling method and system for a photoelectric hybrid low earth orbit satellite network, and relates to the technical field of satellite communication and network resource management.The method comprises the steps that the photoelectric hybrid low earth orbit satellite network is constructed, and topological information, node information and a to-be-scheduled service set of the photoelectric hybrid low earth orbit satellite network are obtained; establishing a mixed integer linear programming model containing node selection constraint, service scheduling sequence constraint and routing constraint by taking the minimum weighted sum of the total service completion energy consumption and the total service completion time as a target; in order to solve the problem of high model complexity, a heuristic algorithm based on simulated annealing is designed, and efficient solution is carried out by iteratively optimizing a scheduling sequence and a routing path of a service; and finally, implementing service scheduling according to the obtained optimal scheduling scheme. According to the method, heterogeneous characteristics of the photoelectric nodes and link resource conflicts are fully considered, dynamic balance of energy consumption and time delay is achieved, network energy efficiency and business service quality are remarkably improved, and the method is suitable for efficient operation of large-scale low-orbit satellite constellations.