1637 results about "Satellite network" patented technology

The invention relates to a time delay optimized satellite network adaptive routing method and system, and belongs to the technical field of satellite communication. The method comprises the steps of multi-hop information age construction, multi-path routing, link state sensing, flow segmentation adaptive routing, dynamic routing decision and the like. A multi-hop information age model is adopted to consider the time-varying property of a link state, the real-time property of path information is accurately estimated, and the timeliness of data updating is ensured; a multi-path search algorithm predicts link occupation frequency according to ephemeris information to construct a plurality of disjoint transmission paths, so that the traffic congestion problem is relieved, and the link resource utilization rate is optimized; a flow segmentation adaptive routing algorithm adjusts the path flow distribution proportion, reduces the data packet loss rate and the information age, and guarantees the stability of time delay sensitive data transmission; according to the method, resource utilization is balanced in a high-dynamic satellite network, link congestion is effectively prevented, the overall transmission efficiency and reliability are improved, and a high-adaptability and efficient transmission scheme is provided for time delay sensitive services.

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.

The invention provides a logic modeling-based high-orbit satellite network dynamic optimization method and an SDN controller, and the method comprises the steps: constructing a logic model corresponding to a high-orbit satellite network according to the attribute information of physical equipment and satellite links in the high-orbit satellite network, collecting the real-time state data in the network, and carrying out the calculation of the real-time state data. Updating logic attribute information in the logic model based on the real-time state data; when it is determined that the resource adjustment requirement exists, generating a resource adjustment control instruction according to the updated logic attribute information, the topological structure of the logic model and a preset service priority; converting the resource adjustment control instruction into an operable command and issuing the operable command to physical equipment; monitoring execution results of the physical devices, and returning to the step of collecting the real-time state data of the physical devices and the satellite links and updating the logic attribute information in the logic model based on the real-time state data. According to the method, dynamic adjustment and closed-loop optimization of resources in the high-orbit satellite network can be realized, and the flexibility, reliability and service quality of the network are improved.

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 relates to the technical field of network security and satellite internet, and provides a satellite network anomaly detection method based on CNN and RWav-KAN. Aiming at the complex characteristics of large scale, high dimension, strong time correlation, dynamic non-stability and the like of satellite network data (including communication data, telemetry data and control data), firstly, spatial information characteristics are extracted by using a convolutional neural network (CNN), and a local mode is captured; then, frequency domain features are extracted through a residual wavelet Colmogolov-Arnodel network (RWav-KAN), and multi-frequency components are captured by adopting wavelet transform, so that the recognition capability of the complex traffic mode is enhanced; and finally, multi-scale features are fused through a dual-channel RWav-KAN structure, and a Softmax classifier is combined, so that the generalization performance and the detection accuracy of the model are remarkably improved. According to the satellite network anomaly detection method, the spatial feature extraction capability of the CNN and the multi-scale frequency domain analysis capability of the RWav-KAN are fused, the feature extraction and multi-scale analysis problems in satellite network anomaly detection are effectively solved, and a new technical means is provided for satellite network safety protection.

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 digital twin architecture for a satellite-ground collaborative edge network, and belongs to the field of network simulation and intelligent management in the satellite internet. According to the digital twin architecture of the satellite-ground collaborative edge network provided by the invention, the operation state, the resource state and the association state of terminal equipment such as an unmanned aerial vehicle and edge equipment such as a satellite are returned through a sliced feeder line, and a digital twin model integrating a data layer, a model layer and a decision layer is established at a gateway station side. Based on the architecture, a satellite-ground collaborative model training task is oriented, and model training and aggregation are realized by utilizing a block chain technology. According to the architecture, full-life-cycle management of the satellite-ground collaborative edge network is realized, through real-time simulation and optimization decision, the digital and intelligent level of the satellite network is improved, the simulation precision, real-time performance and resource utilization efficiency of the network are improved, and efficient and stable operation of the satellite network in a complex dynamic environment is ensured.

The invention provides a multi-satellite cooperative distributed routing method for multi-agent reinforcement learning, and the method comprises the steps: building a satellite network static topology model through a time slicing technology, and building a target function for minimizing the end-to-end time delay of a data packet; constructing a satellite agent network based on the satellite network static topology model, and obtaining satellite interaction experience data; wherein the satellite agent network comprises a multi-satellite cooperative hybrid network and a satellite decision network corresponding to each agent; training a satellite agent network according to the satellite interaction experience data to obtain a trained satellite agent network; and respectively deploying the satellite decision networks in the trained satellite agent network to corresponding agents, so that the agents perform routing decision based on the deployed satellite decision networks. Through cooperative work of the satellite decision network and the multi-satellite cooperative hybrid network, efficient distributed routing decision of a low-orbit satellite constellation can be realized, time delay is reduced, and load is balanced.

The invention relates to a satellite network traffic spatio-temporal characteristic prediction method based on multiple convolutional neural networks, comprising the following steps: step 1, preprocessing input data including satellite network traffic data and satellite network topology information; 2, extracting spatial features, and processing a spatial dependency relationship of satellite network traffic through a GCN module; 3, time features are extracted, global features and local features of the satellite network traffic in the time dimension are extracted through a double-branch Transform encoder structure, the global branch processes long-term dependence through causal convolution and a global attention mechanism, and the local branch processes short-time mutation through dynamic convolution and a local attention mechanism; and 4, fusing the spatio-temporal features and output prediction, fusing the spatial features and the time features, and outputting a prediction result of the satellite network traffic through a linear layer. The accuracy and robustness of satellite network traffic prediction can be improved.

The invention relates to a DDRL-based aircraft mission offloading method in a low earth orbit satellite network. The method comprises the following steps: (1) constructing an LEO low earth orbit satellite network system into an LEO satellite mobile edge computing network system; (2) modeling an LEO low earth orbit satellite network system utility maximization problem into a joint decision problem for optimizing task unloading and resource allocation; and (3) converting a joint decision problem into a Markov decision process MDP, learning an optimal task unloading decision by using a dual depth Q network algorithm DDQN under a dual depth reinforcement learning DDRL framework, and obtaining an optimal resource allocation strategy by using a time difference triple strategy gradient algorithm TD3PG on this basis. Simulation experiments show that compared with a reference algorithm, the scheme can effectively access and cooperatively compute concurrent tasks, and has better convergence and superiority under different environment variables.

The invention discloses a data stream transmission scheduling method based on a distributed SDN satellite network, and the method comprises the following steps: building a distributed SDN satellite network model according to the application background of a large-scale satellite network, and constructing a data stream load balancing routing problem of the large-scale satellite network under the distributed SDN satellite network model; in order to solve the problem of data flow load balancing routing of a large-scale satellite network, a data transmission strategy of a distributed SDN satellite network is adopted, the load balancing effect is achieved, and end-to-end delay is reduced. According to the invention, a distributed SDN satellite network model is established according to the application background of a large-scale satellite network, a data flow load balancing routing problem of the large-scale satellite network is established under the model, and a data transmission strategy based on the distributed SDN satellite network is provided for the optimization problem. According to the strategy, a better load balancing effect and smaller end-to-end delay can be realized.

The invention provides an ocean buoy data real-time acquisition method based on low earth orbit satellite communication, and belongs to the technical field of electrical digital data processing.The ocean buoy data real-time acquisition method comprises the steps that firstly, a low earth orbit satellite network communication link is built, data characteristics are analyzed through a compression conversion gain index model, and a low earth orbit satellite network communication link is established; and establishing a multi-stage compression mechanism. The system adopts an optimization equation set to dynamically adjust compression parameters, the optimization equation set comprises a resource consumption equation, a compression quality equation and a transmission efficiency equation, and self-adaptive compression of data is achieved. And meanwhile, through a hierarchical algorithm selection mechanism and a parameter optimization strategy and in combination with real-time feedback control, continuous optimization of the compression efficiency is ensured. According to the compression scheme based on multi-level optimization, the technical problem of low compression efficiency caused by poor algorithm adaptability in the ocean buoy data compression process in the prior art is effectively solved.

The invention provides a multi-layer satellite network routing method and system based on multi-agent deep reinforcement learning. The method comprises the following steps that: a plurality of low-orbit satellites train respective executor networks by adopting a distributed multi-agent reinforcement learning algorithm to realize routing decision; and one medium-orbit satellite trains a global evaluation network according to the local parameters of the performer network uploaded by the plurality of low-orbit satellites, and provides the global parameters of the trained global evaluation network to each low-orbit satellite, so that the low-orbit satellites update respective local evaluation networks according to the global parameters. And updating respective executor networks according to the updated local evaluation network. According to the multi-layer satellite network routing method and system based on multi-agent deep reinforcement learning, dynamic optimization of a routing strategy can be realized in a medium and low orbit satellite network, and the overall performance of the satellite network is remarkably improved.

The invention discloses a multi-path routing dynamic scheduling method and device for a satellite communication system and a medium, and relates to the field of satellite data transmission, and the method comprises the steps: expanding a path between a source node and a target node in the satellite communication system into a plurality of paths, and obtaining communication quality index parameters of all satellites in the plurality of paths; for each of the plurality of paths, constructing a routing cost function through the communication quality index parameter; updating the graph data of the satellite communication system in real time according to the real-time path change during the operation of the satellite communication system; for each piece of graph data updated in real time, based on the communication quality index parameters, calculating the total routing cost of a plurality of paths between a source node and a target node in the graph data through a routing cost function, selecting a first preset number of paths from the total routing cost of the plurality of paths according to a sequence from low to high, and determining the first preset number of paths as an optimal path combination at the current moment. The method can reduce the transmission energy consumption of the satellite network.

Various approaches for the generation and verification of user equipment (UE) location, using communications and processing capabilities of non-geostationary (NGSO) satellite networks and equipment are discussed. Among other examples, communications between a UE and a low-earth orbit (LEO) satellite may be used to substantiate or corroborate, to a location management function (LMF) of a 5G network, that a UE is located in or at a particular geographical location or area. Additionally, based on this location information and related SV ephemeris data, a satellite coverage area may be determined for a UE at a location at any one moment in time, for coordinating and managing connectivity of the UE with terrestrial and non-terrestrial networks.

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.

A wireless device sends, to a mobility management node via a base station of a satellite network, an indication of support for a store and forward (S&F) mode of operation. The wireless device receives, from the mobility management node, a de-registration timer parameter for the S&F mode.

The invention relates to the technical field of satellite communication, in particular to a multi-link data transmission method, device and system in a low-orbit satellite network. According to the invention, a multi-link data transmission mechanism is adopted, so that the satellite antenna is allowed to establish multiple communication connections with multiple satellites at the same time, and the limitation of single-link communication in the prior art is broken. Compared with an existing single-link transmission mode, bandwidth resources of multiple satellite links can be utilized to the maximum extent, and waste of link resources is avoided. By introducing the LSTM to predict the network performance, the problem of instability caused by network state fluctuation in the prior art is solved. The LSTM model can predict a future network state through historical data, so that when the network performance is about to deteriorate, a data distribution strategy can be adjusted in advance, and network instability caused by bandwidth fluctuation or satellite switching is avoided. Therefore, continuity and stability of data transmission can still be kept when the number of users is suddenly increased or satellites are switched.

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 provides a low earth orbit satellite mobile communication ground experiment method and system. According to the influence of different orbit heights and solar activity periods, a diversified orbit parameter set is planned, and a virtual satellite network model is generated; based on the virtual satellite network model, calculating an optimal transmission path by using a path prediction algorithm, adjusting the characteristics of a transmitted signal through a real-time channel simulation technology, and generating a low-orbit satellite communication environment test scene; based on the low-orbit satellite communication environment test scene, evaluating communication performance data by using an adaptive performance evaluation algorithm, determining a power consumption mode by combining an energy efficiency optimization method, analyzing a relationship between battery consumption and communication quality, and generating a performance evaluation report; and integrating the power consumption data and the communication quality data, converting the integrated data into a practical solution, and generating a low-orbit satellite mobile communication ground experiment result. According to the technical scheme provided by the invention, the comprehensiveness and practicability of the low-orbit satellite mobile communication ground experiment method are improved.

The invention discloses a satellite route management and control switching method and system, and belongs to the field of satellite communication, and the satellite route management and control switching method comprises the following steps: monitoring satellite signal quality, collecting satellite data, judging whether nodes need to be switched or not, and if yes, switching the nodes; the triggering condition comprises that the signal quality decline is lower than a threshold value, and the communication equipment is about to break away from the current satellite network coverage range; when nodes need to be switched, an optimal switching target is selected from the candidate nodes, the signal quality of the optimal switching target is judged, and if the signal quality meets the use requirement, compared with the prior art, the method has the beneficial effects that when the coverage edge overlapping area of the multiple satellite networks is too small and the signal quality is judged to be poor, the optimal switching target is selected from the candidate nodes; according to the method, the switching node is limited, the random switching of the node is not allowed in the set time, the set time can be adjusted according to the actual condition, different conditions are matched, and the problems of communication quality degradation, network resource waste, terminal energy consumption increase and the like are reduced.

A service-level communication and computing collaborative resource allocation device and method for a large-scale satellite network are provided, the device includes: a network information management function module including a service request collection unit configured to collect service requests arriving at each satellite node in the network, and a network resource collection unit configured to collect available resource status information for each satellite node; a service preprocessing function module configured to preprocess service requests; a service feature extraction function module configured to perform feature extraction for preprocessed service requests to generate service demand features; a service order decision submodule configured to determine a service order of service requests; a service strategy decision submodule configured to output a service strategy of the service request. The device and method can effectively ensure that the large-scale satellite network provides high-performance services for service with service demands of communication and computing collaborative resources.

The invention relates to the technical field of low earth orbit satellite network communication, in particular to a low earth orbit satellite network load balancing intelligent routing algorithm based on a DQN, which adopts a time slicing method to learn node connection relation and load condition in each time slot static topology, according to the method, multiple targets such as the distance between target satellites, the node congestion degree and the link available bandwidth are jointly optimized, an optimized next-hop selection strategy is given for each node, a link connectivity matrix is updated for different time slots, training is continued to update network parameters, and the method has better performance in the aspects of time delay and network throughput, and can be applied to the field of wireless communication. The multiplexing of each satellite node in the network is reduced, the problem of uneven load in the network is relieved, and the network performance is improved.

The invention provides an ultra-high-speed terminal access and cooperative authentication method and a program product in a satellite network, and the method comprises the steps: a ground control center responds to a registration request sent by an access point and an ultra-high-speed terminal, and configures an access point identity for the access point; configuring a long-term shared key, a terminal identity, a main public key, a generator on an elliptic curve and an index table for the ultra-high-speed terminal; when any first ultra-high-speed terminal flies to the air and does not deviate from the coverage range of the first access point in the access process, an access authentication request is sent to the ground control center through the first access point to complete access authentication; when the first ultra-high-speed terminal flies to the air and is about to deviate from the coverage range of the first access point in the access process, an access authentication request is sent to the ground control center through the multiple access points on the route of the first ultra-high-speed terminal, cooperative authentication is completed to access the ground control center, and the ultra-high-speed terminal can flexibly and rapidly access the ground control center.

The invention discloses a time-varying routing method and system for a satellite internet, and mainly solves the problems that an existing satellite network routing method is difficult to support satellite high-quality communication, the topology is frequently changed, and the information communication load between satellites is heavy. According to the scheme, the method comprises the following steps: initializing orbit parameters of satellite nodes and an inter-satellite link set; obtaining a link on-off timetable through simulation, and sending the link on-off timetable to a satellite node by a ground station; the satellite node generates a topology prediction message according to the link on-off time table, determines the sending time of the message according to the difference value between the link change moment and the sending time of the routing control message, and floods the message in the limited area; and after receiving the message, the satellite node analyzes the link information to calculate a virtual route, arranges a route updating sequence of the satellite node, replaces the route table with the virtual route table at the link change moment, and issues the route to the basic network layer. According to the method, the transmission load of the network can be effectively reduced, the probability of outdated routing and packet loss is reduced, the method can be used for establishing the satellite internet, and the communication quality between satellites is guaranteed.

The invention discloses a satellite portable station data encryption authentication method and system, and belongs to the technical field of wireless communication network security, and the method comprises the steps: collecting power amplifier nonlinear harmonic spectrum data and environmental noise frequency domain energy distribution data of a satellite terminal, and carrying out the XOR confusion processing, and generating a dynamic key parameter; generating a cross-network authentication pre-distribution parameter based on a preset satellite link stability threshold and the signal quality parameter of the current satellite network; and when the signal quality parameter of the satellite network is reduced to a preset switching threshold, extracting a target network session key parameter, and encrypting and sending uplink data in combination with the dynamic key parameter and the cross-network authentication pre-distribution parameter. According to the invention, a power amplifier harmonic wave and environmental noise fusion key generation technology and a link stability and space-time parameter linkage pre-distribution mechanism are adopted, so that high-safety and low-delay communication protection can be realized in a complex electromagnetic environment and a multi-satellite network switching 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.

The invention relates to the technical field of network security, in particular to a satellite network multi-dimensional threat simulation method and system based on isolated forest detection. The method comprises the following steps of: loading real-time traffic data of a satellite network through a data interface, extracting key indexes, recording traffic size, time delay and packet loss probability, and establishing an initialized traffic characteristic framework; according to the method, through accurate identification of the abnormal modes and comparison with known threat features, judgment of potential threats is more accurate, resource waste caused by misinformation is avoided, evaluation of multi-dimensional threat degrees and specific analysis of threat risks provide more comprehensive safety evaluation, defense measures are more targeted and efficient, and the method is suitable for popularization and application. And the defense configuration is adjusted, and the defense scheme is tested in the virtual environment, so that the effectiveness of the adjustment measure is further verified, the resistance of the satellite network to actual threats is ensured, and the adaptability of the defense configuration and the overall security of the network are remarkably improved.

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.