896 results about "Satellite communication systems" patented technology

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 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 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 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 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.

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.

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.

The invention discloses a satellite antenna servo system vibration sound signal sample enhancement method based on a physical constraint generative adversarial network, and the method comprises the steps: carrying out the multi-mode signal collection and fault simulation, and providing a high-fidelity signal source for training; fault physical parameter modeling is carried out, and a fault physical parameter vector and a fault frequency equation are defined; constructing a physical constraint generative adversarial network training model, and designing a double-branch generator and a physical constraint discriminator; training the physical constraint generative adversarial network, and outputting a high-fidelity vibration sound sample; according to the invention, intelligent fault early warning and diagnosis support is provided for stable operation of a satellite communication system.

The invention provides a satellite communication system with multi-mode capability and a communication method, and belongs to the technical field of satellite communication. A signal processing module of the system comprises a load control unit and a baseband processing unit, the load control unit is responsible for beam correlation calculation, transmission rate control, antenna channel power-on and power-off control and the like, the baseband processing unit is used for processing uplink and downlink signals, and the downlink supports multiple modes. The frequency conversion processing module is provided with an upper frequency conversion channel and a lower frequency conversion channel which respectively process transmitted and received signals. And the wide-beam receiving antenna is responsible for receiving uplink data. The phased array transmitting antenna is responsible for transmitting downlink data, is high in gain and fast in pointing adjustment, and supports multiple modes. According to the communication method, satellite transmitting and receiving are started by default, and transmitting serves as a beacon to assist a user in capturing. According to the invention, the working modes can be flexibly switched, the telemetering downloading capability and the information broadcasting efficiency are improved, and diversified communication requirements are met.

The present invention discloses a broadband 1-bit reconfigurable circularly polarized reflectarray antenna based on a multi-resonant structure, which includes a reconfigurable circularly polarized reflection functional layer, a circularly polarized horn antenna, and an acrylic bracket. The reconfigurable circularly polarized reflection functional layer is composed of M×N circularly polarized reflectarray antenna elements with the same structure, which are periodically arranged at an interval of 0.4125λ0. The circularly polarized reflectarray antenna element consists of a radiation layer and a DC bias layer. The radiation layer includes a circuit pattern designed based on a multi-resonant structure, PIN diodes, a radiation dielectric layer, and a reflection bottom plate. The DC bias structure includes a DC bias dielectric layer and a DC bias circuit. By controlling the on-off states of four PIN diodes, 1-bit regulation of the unit reflection phase can be achieved. By adjusting the states of each circularly polarized reflectarray antenna element, a beam scanning function of ±60° can be realized, and it can be applied in wireless communication and satellite communication systems.

A satellite communication system leverages the carrier offset detection capability of the demodulator contained in an on-board modem of M&C channel. The modern detects the frequency error Δf, introduced in the signal path from the output of the base station at ground to the output of baseband conversion on the satellite, by analyzing the baseband signal at the baseband conversion to estimate the received carrier f′c and subtracting it the from the expected frequency (fc).

In various aspects, a control system for controlling an antenna of a vehicle is provided. The control system may include a satellite communication system (SATCOM) that includes the antenna, which may emit RF signals. The SATCOM may be configured to operate in a plurality of modes. The plurality of modes may include a low power mode and a high power mode. A strength of the RF signals emitted by the antenna may be greater when the SATCOM is operating in the high power mode than when the SATCOM is operating in the low power mode. The control system may be configured to switch the SATCOM from the high power mode to the low power mode when a distance between the vehicle and at least one other vehicle is or is predicted to be less than or equal to a threshold value.

This application relates to the field of satellite communications and discloses a multi-frame fusion transmission method and related apparatus in a satellite communication system. In this system, a transmitting end can negotiate an acknowledgment mode with a receiving end using the total number of frames field and the frame sequence number field in the data frame header. This eliminates the need for additional frame header cell overhead and control signaling overhead when negotiating the acknowledgment mode between the transmitting and receiving ends.

The invention provides a communication module supporting a high-orbit satellite and a low-orbit internet satellite, and belongs to the technical field of satellite communication. Comprising a baseband unit, a radio frequency unit and a power supply and interface unit, the baseband unit, the radio frequency unit and the power supply and interface unit are respectively connected with the other two units in pairs, and the baseband unit mainly operates two standard communication system protocols of high-orbit satellite communication and low-orbit internet narrowband satellite communication to realize the access of a high-orbit satellite network and a low-orbit internet; the radio frequency unit is mainly used for transmitting and receiving radio frequency signals required by high-orbit satellite communication and low-orbit internet narrowband satellite communication; the power supply and the interface unit are mainly used for embedding the communication module into an external terminal so as to realize data interaction with the terminal and simultaneously supply power to the baseband unit and the radio frequency unit. The communication module supports two satellite communication systems, reduces the complexity of peripheral terminal design, and has the advantages of high integration, low cost, miniaturization and low power consumption.

The invention relates to the related field of a peacetime and urgency dual-purpose communication technology, in particular to an interphone peacetime and urgency dual-purpose dual-mode parallel communication method. According to the invention, dual-mode parallel communication is carried out through a private network emergency channel and short message communication of a Beidou satellite communication system, the two modes operate independently and do not interfere with each other, when one communication mode is limited, the other communication mode can continue to work, parallel transmission of voice and data is realized, the problem that single communication fails in a complex environment is effectively solved, and the communication efficiency is improved. The continuity and reliability of communication in an emergency scene are ensured, key information is ensured not to be lost, and the development of emergency rescue work is facilitated.

The embodiment of the invention discloses a broadband signal simulation method and system influenced by Doppler frequency in satellite communication. The method comprises the following steps: sampling a received original broadband signal according to an original sampling rate, and obtaining a signal value of a sampling point in real time; discretizing the sampling time of the original broadband signal at the original sampling rate and after the original broadband signal is influenced by the Doppler effect to obtain a first discrete time value and a second discrete time value; storing the signal value and the first time value in a plurality of filter banks in parallel; based on the second time value and the first time value, triggering the filter bank to perform interpolation operation on the stored signal value to obtain a signal interpolation; and performing frequency modulation on the original broadband signal based on the carrier frequency, the relative speed and the output signal interpolation to form a target signal. According to the method, the signal conversion process can be simulated through the simulation technology, the low-cost performance test requirement of the satellite communication system is met, and meanwhile processing time and resource consumption are reduced according to the multiple filter banks.

An apparatus method and system are disclosed for dynamically implementing spectrum configuration plans in a satellite communication system. A spectrum configuration plan is created, and validated to determine if it can be utilized within the predetermined coverage area. If any errors are generated while validating the spectrum configuration plan, it is rejected. Otherwise, system components are configured to provide communication within the predetermined coverage area using parameters specified in the spectrum configuration plan. The spectrum configuration plan is also transmitted to all terminals in the coverage area. The spectrum configuration plan is subsequently implemented for all communication within the predetermined coverage area.

The disclosure relates to a 5G or 6G communication system for supporting a higher data transmission rate. A method performed by a terminal in a wireless communication system includes receiving, from a base station, configuration information on an orthogonal cover code (OCC), identifying a transport block (TB) and multiple slots for a TB processing, based on the configuration information, applying a different OCC sequence to each repetition of the TB, and transmitting, to the base station, a physical uplink shared channel (PUSCH).

The invention discloses a low-orbit constellation beam resource allocation method based on an adaptive evolutionary algorithm, and the method comprises the implementation steps: obtaining a user demand prediction result through a trained user demand prediction neural network, pre-judging user demand fluctuation in advance, and improving the real-time performance and accuracy of resource allocation. On the basis of a preference list, a Gal-Shapley algorithm is utilized to match satellite beams and users in a beam overlapping area, an objective function and a resource allocation constraint condition are defined according to a satellite communication system model, a self-adaptive evolutionary algorithm is proposed to jointly allocate power and bandwidth, and beam resource allocation optimization is achieved. According to the method, the capacity provided by the satellite is matched with the capacity required by the user, so that the user service coverage rate is improved, and meanwhile, the resource utilization rate of the low-orbit satellite is improved.

This application discloses a random access preamble configuration method applicable to a satellite network and a communication apparatus. In the method, a random access preamble location offset and duration of a PRACH occasion can be flexibly configured based on features of a satellite system. The method includes: A receiving apparatus receives first indication information, where the first indication information includes indication information used to identify the random access preamble location offset at the physical random access channel PRACH occasion. The receiving apparatus transmits a random preamble based on the first indication information, where the random preamble includes a sequence part and a guard time. Because a communication distance is relatively long and a transmission delay difference between users is relatively large in a satellite communication system, time domain resources occupied by the PRACH occasion can be minimized by using this method.