1121 results about "Satellite communication systems" patented technology

The invention discloses a bit timing estimation method and device suitable for satellite communication, and the method comprises the steps: calculating a time correlation parameter and a signal-to-noise ratio parameter of a satellite signal, and determining the size of a time window; constructing a window feature sequence based on a bidirectional recursion processing unit, and performing window segmentation sampling on the received signal; extracting an autocorrelation function of each section of signal to obtain a time domain feature vector, a frequency domain feature vector and a phase feature vector; carrying out three-level nonlinear mapping on the three types of feature vectors to obtain an adaptive weight vector; performing weighted fusion on the features by using a weight vector, executing cubic spline interpolation, and calculating an error compensation value in combination with a channel state parameter to obtain a fine timing estimation value; extracting synchronization features according to the timing estimation value and solving an optimization problem in a segmented manner to obtain a time synchronization parameter; and a fusion feature vector is calculated, a decision result is obtained through pattern recognition and parameter optimization, and bit timing estimation is completed. According to the invention, the timing precision and reliability of the satellite communication system are improved.

The invention provides a multi-network integration ship-shore communication system and an intelligent ship remote driving control system based on a ship Internet of Things, and the hardware part of the multi-network integration ship-shore communication system comprises an integrated circuit board, a power module, an edge calculation module, a communication module, and an extensible communication interface, wherein the power module, the edge calculation module, the communication module, and the extensible communication interface are installed on the integrated circuit board. The communication module comprises a 4G / 5G communication module and / or a satellite module and / or a microwave module and / or a VHF module and / or an AIS module and / or a Beidou satellite module, the edge calculation module is connected with the power supply module, the communication module and the extensible communication interface, and the software part comprises a multi-network integration management software module. And the multi-network integration management software module is installed in the edge computing module. The method has the advantages that the multi-link aggregation system is used, the network transmission rate and stability are improved in the application scene of ship inland river shipping, complementation with a satellite communication system can be formed, and the service stability is further enhanced.

The invention relates to the technical field of wireless communication, and discloses an intelligent channel prediction method based on a deep multi-layer perceptron architecture in order to solve the problem of high-dimensional near-field cascade channel prediction in a reconfigurable intelligent surface assisted low-orbit satellite communication system. Designing a frequency domain MLP architecture to learn global time sequence characteristics of a cascade channel; secondly, considering high-dimensional spatial domain characteristics of a near-field cascade channel, decomposing the cascade channel into a plurality of feature dimensions, and proposing a multi-branch MLP architecture to realize global spatial domain correlation modeling; and finally, by taking the frequency domain MLP and the multi-branch MLP as basic network feature extraction modules, designing a channel prediction network model based on an encoder-decoder architecture. According to the method disclosed by the invention, the accurate prediction of the downlink CSI can be realized by utilizing the historical channel state information estimated by the uplink communication, and the proposed channel prediction model has better channel prediction precision and model convergence speed.

The embodiment of the invention provides a synchronous code detection method, system and device in a low earth orbit satellite communication system, and the method comprises the steps: grading an obtained maximum frequency offset range value of the low earth orbit satellite communication system, and obtaining frequency offset values of different grades, performing synchronous code capture on a first receiving signal of the input signal flow under the frequency offset values of different grades, and obtaining an initial frequency offset estimation value according to a capture result; compensating a second receiving signal of the input signal flow by using the initial frequency offset estimation value, and performing synchronous code capture on the compensated second receiving signal to obtain a candidate synchronous code position confirmed by coarse compensation; based on the candidate synchronous code position, performing frequency offset estimation on the synchronous code data under the plurality of time slots to obtain a candidate frequency offset estimation value; and compensating a third receiving signal of the input signal flow by using the candidate frequency offset estimation value, and performing synchronous code capture on the compensated third receiving signal to obtain a synchronously captured target synchronous code position. According to the invention, the detection of the synchronous code in the low-orbit satellite communication system is realized.

The invention discloses a network selection method and system in a satellite communication system and a related device. A terminal can obtain satellite network selection information from a cloud server, wherein the satellite network selection information comprises historical residence information and beam coverage information. Wherein the historical resident information comprises a frequency point and a position of a successfully resident satellite network and a system message of the satellite network. The beam coverage information comprises a beam center position and a frequency point of each beam. And the terminal resides at the frequency point of the satellite network based on the satellite network selection information. Therefore, the terminal can obtain the frequency point where the terminal can reside on the terminal position based on the position of the terminal and the position information provided by the satellite network selection information. Moreover, when the terminal finds the frequency point where the terminal can reside in the historical residence information, the terminal can perform network residence operation by using the system message in the historical residence information, and the terminal does not need to receive the system message from a satellite, so that the time of acquiring the system message by the terminal is saved, the terminal can access the satellite network more quickly, and the communication efficiency is 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.

The invention discloses a time synchronization method suitable for a satellite communication system, and the method comprises the steps: analyzing a forward broadcast signal, and obtaining the reference time of a network clock; constructing a geometric prediction handle based on satellite orbit data, and predicting one-way propagation time delay between a terminal and a satellite by using the geometric prediction handle; estimating the processing delay of the terminal according to the symbol rate and the equipment working condition of the terminal and the delay calibration data; fusing the network clock reference time with the processing delay estimate to synthesize a terminal local time; and the sending time of the return link is calculated based on the local time and the propagation delay prediction. According to the method, the synchronization precision can be improved to a microsecond level, the convergence speed in a dynamic scene is accelerated, adaptive compression of the guard interval is supported, and the stability and spectrum efficiency of a satellite communication system are effectively improved.

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 relates to a large language model Agent proxy method for satellite communication operation and control, and belongs to the field of operation and maintenance control and network management of a satellite communication system. The method comprises the following steps: constructing an Agent, wherein the Agent comprises a personalized long-term memory component, a graph retrieval component, a workflow planning component and an intention correction component; adding the constructed Agent for the large language model in a plug-in form; after the big language model reads user input, firstly, the intention correction component is used for correcting wrong intentions of a user to obtain corrected intention input, and then enhanced retrieval data is obtained through the personalized long-term memory component and the graph retrieval component; and finally, transmitting the corrected intention input and enhanced retrieval data to a workflow planning component to obtain operation and control parameters issued to a satellite, a terminal or an earth station. According to the invention, the problem that the intelligent degree is low due to the fact that operation and maintenance are mainly performed by manpower in the operation and maintenance management and control and network management fields in the satellite communication field at present can be solved.

The invention provides a low-orbit satellite beam scheduling optimization method and system based on a simulated annealing algorithm, and belongs to the technical field of satellite communication. Firstly, modeling is carried out on a determined satellite communication system model and communication service distribution in a satellite coverage range, then a channel model between a satellite and a communication terminal is established, then constraint conditions of a problem are determined, mathematical modeling is carried out on the optimal beam scheduling problem, and the optimal beam scheduling problem is obtained. In order to simultaneously improve the coverage communication service volume and reduce the inter-beam interference, the beam scheduling problem is solved by using the simulated annealing algorithm, the optimal design of the beam pattern is realized, and the comprehensive performance of the low-orbit satellite communication system is improved.

The invention relates to the technical field of satellite internet, in particular to a low-orbit satellite communication system positioning method and a terminal. Comprising the following steps: a user terminal receives satellite broadcast to obtain ephemeris information at the current moment and position information of a wave position center point, and carries out initial time delay estimation and initial frequency offset estimation; then the user terminal carries out time-frequency pre-compensation processing on the PRACH signal according to the initial time delay and frequency offset estimation and sends the PRACH signal to a satellite; and after the satellite captures the PRACH signal, positioning the user terminal corresponding to the PRACH signal according to the residual time delay and the residual frequency offset carried in the PRACH signal and the position of the wave position center point. Therefore, under the condition of not depending on GNSS information, the satellite side can position the GNSS-free terminal.

The invention discloses a method and a system for recovering time domain nonlinear distortion of an OFDM (Orthogonal Frequency Division Multiplexing) signal of satellite communication, which mainly solve the problem that the nonlinear distortion of the OFDM signal of the satellite communication is difficult to recover in the prior art. According to the scheme, the method comprises the following steps: acquiring a data set of satellite communication OFDM signal time domain nonlinear distortion recovery; constructing a deep learning network model composed of an optimized multi-layer one-dimensional convolutional neural network and a bidirectional long-short-term memory network module; inputting the acquired data set into a deep learning network model for training, verification and testing so as to recover a time domain distortion signal; and carrying out channel equalization and demodulation on the recovered time domain signal, completing demodulation from a modulation symbol to bit information, and realizing effective recovery and transmission of data. The method has good mean square error and bit error rate performance, the complexity of a network model can be reduced, signal distortion caused by nonlinear distortion can be effectively recovered, the precision and efficiency of signal recovery can be improved, and the method can be used for recovering nonlinear distortion signals in a satellite communication system.

The invention provides a vehicle-mounted satellite communication system and method, equipment, a storage medium, a program product, a vehicle and a vehicle system. The vehicle-mounted satellite communication system comprises an antenna group, a radio frequency change-over switch and a processing module, the antenna group comprises a plurality of antenna units, and beam ranges of different antenna units are different; the radio frequency change-over switch is connected with the antenna group and is controlled to switch radio frequency connection states of different antenna units in the antenna group; and the processing module is used for collecting the signal strength received by different antenna units, determining a target antenna unit in the antenna group according to the signal strength, and controlling the radio frequency change-over switch to be connected with the target antenna unit to realize satellite communication. The vehicle-mounted satellite communication system provided by the embodiment of the invention is simple in structure, good in satellite communication effect and suitable for being carried on a common passenger vehicle.

The invention discloses a joint detection method for a satellite-ground downlink NOMA (Non-Orthogonal Multiple Access) system, which is characterized by comprising the following steps of: S1, inserting pilot frequencies in a time-frequency grid through pilot frequency signals which are sparsely and uniformly arranged in a sub-channel of a transmitting end; s2, extracting a pilot signal at a receiving end, and performing channel estimation based on a deep residual convolutional network; s3, performing multi-user signal detection based on an iterative retraining method of a deep neural network; s4, optimizing power distribution within a power distribution factor threshold range based on a sparrow search algorithm, and minimizing a system bit error rate; s5, combining the step S2, the step S3 and the step S4 to form a joint detection model based on deep learning; through combination of deep learning and a sparrow search algorithm, the problems of channel estimation precision, signal detection capability, power distribution optimization and the like in the system are solved, the overall performance and reliability of the system are improved, and the method is suitable for large-scale user access and efficient data transmission requirements in a modern satellite communication system.

The disclosure relates to a fifth generation (5G) or sixth generation (6G) communication system for supporting higher data transfer rates. A method performed by a user equipment (UE) in a communication system is provided. The method includes identifying physical uplink shared channel (PUSCH) transmissions to be transmitted on slots, identifying orthogonal cover code (OCC) groups corresponding to the PUSCH transmissions, and transmitting, on the slots, the PUSCH transmissions with OCC applied based on the OCC groups, wherein a same redundancy version (RV) value is applied for one OCC group among the OCC groups.

The invention provides a multiphase filtering sampling method suitable for satellite communication. The method comprises the following steps: receiving an original modulation signal and converting the original modulation signal into a digital signal sequence; extracting a signal feature vector and generating a processing configuration parameter; performing orthogonal decomposition to generate I / Q signal pairs and performing oversampling; initializing a multi-phase filter and generating an optimal filter coefficient; carrying out phase calibration and filtering; determining an interpolation coefficient and executing multi-stage integer interpolation and mixed precision fractional interpolation; configuring a dynamic cache system; phase reordering and synthesis are executed; spectral analysis is performed and optimization parameters are generated. According to the invention, high-precision signal processing is realized, the adaptive capability and the efficient resource utilization characteristic are realized, and the performance of a satellite communication system is remarkably improved.

The invention discloses a beam forming anti-interference method and device in a low-earth-orbit satellite communication system, and the method comprises the steps: building a low-earth-orbit satellite communication system model based on a planar array antenna, and receiving a signal through a receiving end of the low-earth-orbit satellite communication system; wherein the signals received by the receiving end comprise user signals transmitted by a plurality of ground nodes and interference signals generated by an external interference source; estimating the arrival angles of the user signals and the interference signals by using a multiple signal classification algorithm; by converting a maximized SINR problem into a power minimization problem under an arrival angle gain constraint, inter-user interference and external interference are suppressed so as to solve and obtain a beam forming matrix. According to the invention, the multi-node communication requirement of the satellite communication system can be met, the anti-interference of the satellite receiving end is realized, and the capacity of the satellite communication system is improved.

The invention relates to the technical field of communication, and provides a switching method for a ground communication network and a satellite communication system, and the method comprises the steps: obtaining the signal performance data of a current geographic position; performing calculation based on the signal performance influence factor of the current geographic position to obtain a current switching threshold value of the current geographic position; verifying the current switching threshold value to obtain a threshold value verification result, and adjusting the signal performance influence factor based on the threshold value verification result to determine an updated switching threshold value; and comparing the signal performance data with the updated switching threshold to obtain a communication switching decision. According to the method provided by the invention, the current switching threshold value of the current geographic position is calculated through the signal performance influence factor of the current geographic position, the current switching threshold value is verified, the signal performance influence factor is adjusted based on the threshold value verification result, and the switching threshold value is determined and updated. The adaptive, reasonable and reliable switching threshold setting is realized, and the communication experience of a user is greatly improved.

The invention discloses an LEO satellite combined beam-hopping pattern scheduling and power distribution method, and belongs to the technical field of satellite communication, and the method comprises the steps: constructing a system model of a downlink of a beam-hopping low-orbit satellite communication system and a decision variable of BHP scheduling; constructing a joint BHP scheduling and power distribution optimization problem taking maximization of the minimum service satisfaction as an optimization target under the time delay constraint; setting a distance threshold value for avoiding co-channel interference between beams, and reducing the solution space scale of BHP scheduling; solving a power distribution optimal solution in each BHTS by a BHP scheduling method based on weight search; and solving the corresponding power allocation sub-problem BHTS in the whole beam hopping period. According to the method, the business satisfaction degree of each region can be maintained at a relatively high level, a suboptimal solution is adopted during BHP scheduling, an optimal solution is adopted during power distribution, and on the premise that the decision time is shortened and computing resources are saved, the performance of a global optimal solution is approached.

The invention provides a data processing priority scheduling method for high-speed satellite communication and related equipment, which can effectively improve the transmission performance of a high-speed satellite communication system so as to adapt to differentiated requirements of various communication scenes. The method comprises the following steps: acquiring cross-layer state information; calling a strategy matrix, wherein the strategy matrix is used for defining weight coefficients of different data types under different network states and channel qualities; calculating a target priority score for the to-be-transmitted data stream according to the cross-layer state information and the strategy matrix; sequencing the target priority scores from high to low to obtain a sequencing result; scheduling transmission queues of the data streams for transmission according to a sorting result, and allocating cache transmission queues for the data streams with high priority scores; when it is monitored that the priority score of the new data stream exceeds a preset emergency threshold value, the new data stream is inserted into a cache transmission queue of the transmission queue, and back pressure control is carried out on data streams of other priorities.

The invention provides a beam scanning device, and the device comprises an antenna module, the antenna module comprises S antenna arrays, and S is an integer greater than 1; a coverage area of the satellite communication system is divided into S sub-areas according to quadrants, and each antenna array is used for carrying out beam scanning on one sub-area. The invention also provides an antenna array determination method and a satellite communication system. The technical problem of how to realize large-angle beam scanning by a satellite communication system is at least solved.

The invention discloses an unmanned aerial vehicle inspection system prototype verification method and system based on low orbit satellite communication, and the method comprises the steps: collecting complex terrain parameters, building an end edge cloud satellite full-link basic environment, and outputting deployment topology and environment features; verifying plug and play and fault self-recovery of the heterogeneous terminal, and outputting an anti-interference communication baseline; quantizing link performance of satellite-ground communication in an extreme scene, and outputting link performance quality; checking the reliability of the most core data uploading and instruction downlink performance of the system; a communication capability and an interaction function are integrated, and the unattended closed-loop mode response capability executed by the satellite return cloud analysis terminal is tested; and injecting a multi-mode failure scene and a limit load, verifying the survivability and the security boundary of the whole link, and outputting a verification report. According to the invention, through a multi-dimensional verification process, the cooperative work reliability of the remote intelligent inspection terminal and the low-orbit satellite communication system is ensured, and the effectiveness of a closed-loop inspection mode in a complex scene is verified.

The present application discloses a network selection method and system in a satellite communication system and a related apparatus. A terminal can acquire satellite network selection information from a cloud server, wherein the satellite network selection information comprises historical camping information and beam coverage information. The historical camping information comprises a frequency point of a satellite network that is successfully camped on, a position, and a system message of the satellite network. The beam coverage information comprises the beam center position of each beam and a frequency point. The terminal camps on a frequency point of the satellite network on the basis of the satellite network selection information. In this way, on the basis of the position of the terminal and position information provided by the satellite network selection information, the terminal can acquire a frequency point on which the terminal can camp at the position. Moreover, when the terminal finds, from the historical camping information, a frequency point on which the terminal can camp, the terminal can use the system message in the historical camping information for a network camping operation, and the terminal does not need to receive the system message from the satellite, thereby saving the time for the terminal to acquire the system message, facilitating faster access of the terminal to the satellite network, and improving the communication efficiency.

Systems and methods for supporting more flexible coverage areas and spatial capacity assignments using satellite communications systems are disclosed. A hub-spoke, bent-pipe satellite communications system includes: terminals; gateways; a controller for specifying data for controlling satellite operations in accordance with a frame definition including timeslots for a frame and defining an allocation of capacity between forward and return traffic; and a satellite including: pathways; at least one LNA, an output of which is for coupling to a pathway and to amplify uplink beam signals in accordance with the allocation; and at least one HPA, an input of which is for coupling to the pathway and to amplify downlink beam signals in accordance with the allocation, and wherein the frame definition specifies at least one pathway as a forward pathway for at least one timeslot and as a return pathway for at least one other timeslot in the frame.

This application provides a communication method and apparatus, to resolve a problem that a quantity of supported beams in an existing solution is limited and therefore a large-scale cell cannot be fully covered, thereby improving reliability of initial access of terminal devices in the large-scale cell. The communication method and apparatus are applicable to various communication systems, for example, an NTN system, a satellite communication system, an aerial platform communication system, an uncrewed aerial vehicle communication system, a 5G system, an internet of vehicles system, and a V2X system. The method includes: generating N SSBs, where N≤Lmax, Lmax>64, Lmax is a maximum quantity of supported sent SSBs, and N is a quantity of SSBs actually sent in one SSB cycle; and sending the N SSBs, where the N SSBs each carry an index i, and i is one of {0, 1, . . . , N−1}.

The invention belongs to the field of satellite communication, and provides a high-safety anti-interception satellite communication method based on a double-beam user terminal and double satellites aiming at the problem that a satellite communication system is easily intercepted and threatened due to open channels and relatively fixed satellite orbit information. Two beams of a double-beam user terminal are respectively aligned with two communication satellites, user service data are split in the two beams according to a configured proportion and then are sent in parallel, effective information cannot be decoded and intercepted under the condition that potential opponent detection receives a single-path communication signal, and even if two-path communication signals are detected, the effective information cannot be decoded and intercepted due to the fact that an information splitting rule cannot be obtained, so that the user service data cannot be decoded and intercepted. And effective information is difficult to decode and recover, so that extremely high information security and anti-interception capability of a user communication service are formed. According to the method, the non-partner information interception difficulty is high, and the method is particularly suitable for design and development work of key user satellite communication systems and user terminals with safety and anti-interception communication requirements as the main.

The invention discloses a mobility management optimization method and system in a low earth orbit satellite system. The system comprises two core mechanisms of idle state position registration and connected state Xn switching. Aiming at idle state management, registering through periodic position change, integrating registration requests of a plurality of UE (User Equipment) by adopting a batch message merging technology, and sending the integrated registration requests to a ground core network; in the aspect of connection state management, a multi-UE collaborative switching process based on an Xn interface is designed. According to the method, the problem of signaling storm in a low-orbit satellite high-speed moving scene is effectively solved, the switching time delay is greatly reduced, the data stream continuity retention rate is remarkably improved, and the method is suitable for mobility management optimization of a large-scale satellite communication system.

The invention discloses a communication control system based on a satellite system driver layer, the system is located between a satellite system protocol layer and a physical layer, and the system specifically comprises a system initialization module used for carrying out unified initialization configuration on system hardware and software; the time service information processing module is used for acquiring time service information from a time service module in the satellite communication system, performing time service calculation and synchronizing the time service information to other modules; the message receiving and analyzing module is used for receiving and analyzing the control type UDP message and the data type UDP message from the protocol layer, storing the data to be sent to the physical layer in the control type UDP message into the shared storage space in a data index form, and performing cache management on the burst time plan of the burst data; the interrupt response module is used for responding to various interrupt events in the system by adopting a multiplexing mechanism; and the multi-thread parallel control module is used for independently allocating a thread to each module for parallel processing. According to the invention, the adaptation problem between the physical layer and the protocol layer can be solved.

The invention discloses a hydroelectric power station state monitoring communication method, system and device and a medium, and the method comprises the steps: carrying out the channel attenuation prediction through employing an integrated learning algorithm, and obtaining a channel attenuation prediction result; based on a channel attenuation prediction result, communication parameter optimization is carried out through a control optimization algorithm, and the optimal transmitting power and coding modulation scheme are obtained; analyzing through a deep learning framework to obtain a communication traffic prediction result; dynamically adjusting resource allocation of each service flow through a bandwidth allocation strategy based on a communication flow prediction result to obtain optimized bandwidth resource allocation; through the configuration instruction, the communication parameter setting is dynamically adjusted, and the fine management of the communication system is realized. The satellite communication system of the hydropower station is more reliable and efficient, and better support is provided for operation management of the hydropower station.

The invention relates to a downlink data transmission method and device, equipment and a storage medium. According to the invention, the base station sends the first indication information to the terminal to indicate whether the terminal performs coverage enhancement. And under the condition that coverage enhancement needs to be carried out, sending second indication information to the terminal, and sending downlink data to the terminal according to the second indication information. According to the embodiment of the invention, the terminal receives the downlink data from the corresponding time slot on the basis of the repetition times of the downlink data indicated in the second indication information and / or the time slot number for transmitting the downlink data, and the same downlink data is transmitted in multiple time slots, so that the demodulation performance is improved by reducing the code rate. Besides, the terminal merges the repeated downlink data received on different time slots, so that the success rate of receiving the downlink data by the terminal is improved, the transmission delay caused by retransmission is avoided, and the downlink data transmission efficiency of the satellite communication system is improved.