426 results about "Satellite communication systems" patented technology

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 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.

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 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 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 embodiment of the invention provides a signal demodulation method and device, a satellite communication ground receiver and a storage medium, and relates to the field of satellite communication. According to the method, accurate timing capture is realized by performing coarse synchronization on an original received signal, and then the problem of carrier lock loss caused by large-amplitude Doppler frequency shift caused by high-speed motion and the change rate of the large-amplitude Doppler frequency shift is effectively solved by adopting a mode of combining frequency offset correction and dynamic frequency offset compensation; furthermore, a full-field phase compensation sequence is constructed, point-by-point phase correction is implemented, and phase deviation changing along with time is accurately recovered by utilizing an unwrapping and interpolation technology, so that interference of phase ambiguity on demodulation is avoided; and finally, symbol judgment and data demodulation are carried out on the basis of completing frequency and phase double fine correction, so that the error rate is greatly reduced, the robustness and reliability of a satellite communication system under an extreme channel condition are enhanced, and stable and efficient signal recovery under a large-frequency-offset, high-dynamic and low-signal-to-noise-ratio scene is realized.

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 an RIS-assisted millimeter wave satellite communication system channel estimation method based on PARAFAC. The method comprises the following steps: constructing an RIS-assisted millimeter wave satellite communication system cascade channel model; the method comprises the following steps: modeling received signals of an RIS-assisted satellite communication system into a third-order parallel factor (PARAFAC) model through data reconstruction based on a multi-dimensional structure of an RIS-assisted millimeter wave satellite communication system channel; and performing parallel factorization on received signals of the RIS-assisted satellite communication system by using an alternating optimization method to obtain an estimated value of a model factor matrix, and finally reconstructing an RIS-assisted satellite communication channel by using the estimated value of the factor matrix to obtain a channel estimated value. The RIS-assisted millimeter wave satellite communication system channel estimation method can accurately achieve RIS-assisted millimeter wave satellite communication system channel estimation, and the performance of the RIS-assisted millimeter wave satellite communication system channel estimation method is superior to that of a traditional least square method (LS)-based channel estimation method.

The embodiment of the invention provides a railway vehicle-mounted sensing system data acquisition system and method based on multi-source triggering, and the system comprises a satellite communication system which is used for obtaining the current position information of a train in real time; the vehicle-mounted ATO system is used for acquiring current state information and running condition information of the train; the ground trackside sensing unit is used for sensing the ground trackside environment through sensing equipment deployed along the railway and acquiring ground trackside environment sensing information; the vehicle-mounted sensing system is used for sensing a headroom area in front of running of a train through a vehicle-mounted sensor, acquiring sensing information of the headroom area in front of running, acquiring information of the satellite communication system, the vehicle-mounted ATO system and the ground trackside sensing unit, and sending the information to the data acquisition cloud platform; and the data acquisition cloud platform is used for acquiring the information sent by the vehicle-mounted sensing system, performing data summarization, and issuing data acquisition triggering information to each train according to data acquisition requirements based on the summarized data.

The invention relates to a Doppler frequency offset compensation method based on double-link cooperation and a satellite communication system. The Doppler frequency offset compensation method comprises the following steps that a UHF transmitter of a mobile platform terminal sends GPS information data of the mobile platform terminal to a UHF receiver of a satellite end; the UHF receiver of the satellite end receives GPS information data of the mobile platform terminal and transmits the GPS information data to the Ka receiver of the satellite end; a Ka receiver at the satellite end calculates UHF Doppler frequency offset by using the GPS information data of the mobile platform terminal and the position and speed of the satellite, and calculates Ka Doppler frequency offset based on the UHF Doppler frequency offset; injecting the Ka Doppler frequency offset into a local oscillator synthesizer of a Ka receiver at a satellite end to carry out Ka Doppler frequency offset pre-compensation; and compensating the pre-compensated residual frequency offset by using the phase-locked loop. According to the Doppler frequency offset compensation method, the time delay bottleneck of Ka link frequency offset compensation is highlighted, and the requirement that the end-to-end time delay of low-orbit satellite real-time services is smaller than or equal to 50 ms is met.

The invention discloses a wide-angle scanning dual-frequency circularly-polarized common-aperture phased-array antenna, and mainly solves the problems that an existing common-aperture phased-array antenna is difficult to realize dual-frequency aperture multiplexing and small in scanning angle. The antenna comprises N * N rectangular small-sized common-aperture antenna arrays which are closely arranged and a feed transmission structure, and an antenna unit in each sub-array comprises a Ka wave band transmitting left-hand circularly polarized antenna and a K wave band receiving right-hand circularly polarized antenna which are formed by alternately stacking and pressing two substrates made of different materials, the two antennas with different frequency bands adopt different feed forms and different rotary arraying modes, metalized blind holes are added around the antennas, and segmented cutting grooves and gaps are formed in antenna patches. A feed transmission structure comprising a left-handed circular polarization port and a right-handed circular polarization port is correspondingly arranged below the antennas of different wavebands, and each port is connected with a phase shifter. The wide-angle scanning antenna can realize large-wide-angle scanning in a range of 60 degrees, has the advantages of miniaturization, low profile and integration of transmitting and receiving, and can be used for a low-orbit satellite communication system and multi-band fusion and intelligent networking.

The disclosure relates to a 5G communication technique for supporting a higher data transmission rate beyond a 4G system, and a system therefor. A method performed by a terminal according to an embodiment of the present disclosure may comprise the steps of: receiving configuration information related to a physical uplink shared channel (PUSCH) repetitive transmission through higher layer signaling; and transmitting multiple PUSCHs corresponding to the PUSCH repetitive transmission in multiple slots on the basis of pre-compensation.

The invention provides a satellite communication method and device, computer equipment and a storage medium, the method is applied to a satellite communication system, the satellite communication system comprises user equipment, a first modem, a second modem and a target server, and the method comprises the following steps: responding to a communication connection request of the user equipment to the target server; creating a satellite communication link between the user equipment and the target server through the first modem and the second modem; and performing data transmission control on the satellite communication link based on a dynamic bandwidth delay product window model and a BBRv2 congestion control algorithm. Based on the scheme of the invention, the transmission performance in a high-delay and high-error-code environment is remarkably improved while the transparent proxy of a satellite link is realized.

The invention discloses an interference signal offset method based on modulation interference accurate reconstruction, and belongs to the technical field of satellite communication. The method comprises the following steps: carrying out symbol estimation, time delay estimation, carrier phase estimation and amplitude estimation of an interference signal on a mixed signal; carrying out carrier recovery on the mixed signal, reconstructing a symbol, and generating an interference signal for offset; carrying out time delay on the mixed signal, and carrying out time alignment on the mixed signal and a regenerated interference signal; using a channel response estimation method to counteract interference signals in the delayed mixed signals, and outputting residual low-speed signals; and carrying out carrier phase reduction on the residual low-speed signals to finish interference signal cancellation. The power spectrum density of the low-speed signals in the overlapped satellite communication system can be effectively reduced, and the system capacity of the low-speed signals is improved under the condition that the low-speed signals occupy the total satellite power.

The described features generally relate to determining dynamic signal quality criteria for an installation of satellite terminals for communications in a satellite communications system. In particular, the signal quality criteria for an installation may be based on an identified position of the satellite terminal to be installed, and in some examples based on the positions and signal characteristics of neighboring satellite terminals that have already been installed. In some examples, a signal quality map may be generated for a service beam coverage area, based on predetermined transmission characteristics and / or measured transmissions from a number of satellite terminals served by a communications satellite. The generated signal quality map may then be used to determine a signal quality threshold for the installation of a satellite terminal being installed for communications in a satellite communications system.

A vehicle-mounted satellite communication system and method, a device, a storage medium, a program product, and a vehicle. The vehicle-mounted satellite communication system comprises an antenna group, a radio frequency switch, and a processing assembly; the antenna group comprises a plurality of antenna units, and different antenna units have different beam coverages; the radio frequency switch is connected to the antenna group, and is controlled to switch radio frequency connection states of different antenna units in the antenna group; and the processing assembly is used for collecting signal strength received by the different antenna units, determining a target antenna unit in the antenna group on the basis of the signal strength, and controlling the radio frequency switch to be connected to the target antenna unit to implement satellite communication.

The invention discloses a dynamic beam hopping and resource allocation method for NGSO satellite security communication, and belongs to the field of sixth-generation mobile communication security communication and wireless resource allocation. According to the method, significant non-uniformity of distribution of ground flow requirements in a time domain and a space domain is considered, and a satellite-ground security communication network dynamic beam hopping and resource allocation problem model is constructed by considering ground user flow requirements and composition elements and channel characteristics of an NGSO multi-beam satellite network. Through joint optimization of satellite hopping beam scheduling, power resource allocation and auxiliary interference unmanned aerial vehicle deployment strategies, service requirements of different users and ground eavesdropping environments are dynamically adapted, and the safety throughput and queue delay fairness of the system are improved. According to the method, mixed integer linear programming modeling is adopted, and a low-complexity approximation algorithm is combined, so that the method not only has optimality guarantee, but also can be deployed and operated in an actual satellite communication system, and thus unification of secure communication and efficient resource scheduling is realized.

The invention discloses a buoy satellite communication system channel estimation method and system in a marine environment, and the method comprises the steps: carrying out the preliminary channel estimation at a receiving end through a least square algorithm, and then achieving the fine optimization through an ARCENet model based on an attention mechanism and a residual network, the residual structure improves the training stability; and the interpolation layer adopts a generative adversarial network to realize high-precision response reconstruction. The method has the advantages that the calculation load is reduced through the lightweight network design, and the dynamic characteristics of the channel are captured through nonlinear mapping; the sparse pilot frequency configuration is kept to save spectrum resources, and the robustness under the condition of low signal-to-noise ratio is remarkably improved. And finally, high-precision recovery of channel response under a complex sea condition is realized, and the reliability of a buoy satellite communication link is effectively guaranteed.

The invention discloses a high-throughput laser satellite communication system, relates to the technical field of satellite optical communication, and aims to solve the problems of limited transmission capacity, insufficient anti-interference capability and low signal compensation precision in the prior art. The system comprises a satellite signal modulation unit, a satellite laser mode mapping unit, a free space transmission channel, a satellite laser mode demapping unit and a satellite signal demodulation unit. Compared with an existing laser satellite communication system, the system realizes dynamic mode management and an intelligent compensation algorithm based on a neural network, improves the anti-interference capability of free space transmission by optimizing laser mode selection, realizes signal independent compensation by using the weak coupling characteristic of the mode, effectively improves the compensation effect, and improves the communication efficiency. The method is suitable for high-throughput and high-speed satellite communication transmission scenes.

The invention provides a wave position dynamic transfer method, system and device based on inter-satellite linkage and a medium, and the method is executed by an overload satellite and comprises the steps: judging whether a self load is overloaded or not; if the load is judged to be overloaded, selecting a to-be-transferred wave position from self-managed wave positions; acquiring state information of the adjacent satellites through inter-satellite interaction with the adjacent satellites; based on the obtained state information, determining a target satellite capable of bearing a to-be-transferred wave position from adjacent satellites having coverage overlapping with the target satellite; negotiating with the target satellite through an inter-satellite link to confirm beam position transfer, and triggering the target satellite to adjust the beam to cover the to-be-transferred beam position; and after negotiation confirmation, controlling the user equipment in the to-be-transferred wave position to be switched to the target satellite, and releasing the wave position resources. By adopting the method, the communication delay of the user equipment can be reduced, the throughput of the user equipment and the constellation resource utilization rate can be improved, and the service quality and user experience of a satellite communication system can be comprehensively optimized.

The embodiment of the invention provides a communication method and device, equipment and a medium, relates to the technical field of satellite communication, is applied to a TDD satellite communication system, and is used for improving the utilization rate of air interface resources. In the present application, a satellite station device can respectively send time slot scheduling information to terminals in corresponding beam positions based on scheduling frame formats of a first beam position and a second beam position, and in the scheduling frame formats, idle time slots of the first beam position are a DL time slot and an UL time slot of the second beam position. The idle time slot of the first wave position can be the DL time slot and the UL time slot of the second wave position, so that the satellite station equipment can perform scheduling operation as far as possible on each time slot to the greatest extent, and therefore, the purpose of improving the utilization rate of air interface resources can be achieved.

The invention discloses a dynamically-graded satellite TBTP efficient broadcasting method and a satellite communication system, and the method comprises the steps: obtaining the dynamic forward signal-to-noise ratios of all online terminals in a current network at a transmitting side, and carrying out the dynamic grading, thereby obtaining a multi-stage parallel forward channel broadcasting TBTP sub-table; the scheduling time slot entries are classified into corresponding TBTP sub-tables according to the SNR of the terminal, the TBTP sub-tables are sent to a gateway according to an ascending sequence of the SNR, and the lowest SNR of the grade is carried in each sub-table to serve as a grading SNR identifier; the gateway regards the received sorted TBTP sub-tables as multiple paths of data streams with the same scheduling priority and incorporates the multiple paths of data streams into a TBTP broadcast priority queue; and carrying out physical frame assembly and modulation according to the TBTP broadcast priority queue, and sending the TBTP broadcast priority queue to a receiving side to parse the parsable TBTP signaling so as to restore the parsable TBTP signaling to obtain a complete resource allocation view for reverse transmission. According to the dynamic difference of the forward signal-to-noise ratios of the terminals, differentiated efficient broadcasting of the TBTP is realized, so that the overall utilization efficiency of forward link resources is remarkably improved on the premise of ensuring reliable reception of all the terminals.

The embodiment of the invention discloses a communication method and device, relates to the technical field of communication, and is used for reducing the access delay of a terminal in a satellite communication system. The method comprises: receiving a plurality of beams of a target cell, the plurality of beams comprising an optimal beam and N suboptimal beams, N being a positive integer; under the condition that the time interval between the current moment and the RO of the optimal beam is smaller than or equal to a first threshold value, a random access sequence is sent to target network equipment based on the optimal beam, and the target network equipment is network equipment corresponding to the target cell; and when the time interval between the current moment and the RO of the optimal beam is greater than a first threshold, sending a random access sequence to the target network device based on a target suboptimal beam, the target suboptimal beam being a suboptimal beam of which the RO is closest to the current moment in the N suboptimal beams.

A communication method, device and system are applied to a satellite communication system. The method comprises the following steps: the terminal equipment determines whether to store state information of the terminal equipment, the terminal equipment sends the state information to network equipment under the condition of determining to store the state information, and the state information is used for accessing a non-ground network. According to the technical scheme, simplified access and communication are realized based on the state information stored by the terminal equipment, and signaling overhead and access / communication time delay can be reduced.

A satellite in a communication system may be equipped with an antenna system that includes various configurations of antenna arrays on one or more sides of the satellite to receive and transmit signals, and a transponder system coupled with such antenna arrays that is configured to route signals between one or more reception ports and one or more transmission ports. Such antenna arrays may be configured to support directional reception, directional transmission, or both, and a transponder system may perform one or more aspects of signal processing. A satellite may be configured with particular combinations of components in a reception system and a transmission system, and a corresponding transponder system may include various signal paths that support combinations of couplings and associated signal processing between the output ports and input ports to support various techniques for relaying communications via the satellite.

The invention discloses a satellite communication method, a satellite communication system and a related device. The first electronic equipment receives a dialing operation of a user for communicating with a first contact, the first electronic equipment does not reside in a cellular network, and the first electronic equipment establishes a satellite communication connection with a satellite; in response to the dialing operation, the first electronic equipment displays a call interface with the first contact person, the call interface comprises a first indicator, related information of the first contact person and a hang-up control, and the first indicator is used for indicating the satellite signal strength and the connection state of the first electronic equipment and a satellite. In this way, the first electronic device can communicate with the second electronic device through the satellite communication connection without a cellular network.

The invention discloses a full-duplex inter-satellite communication system and method suitable for annular networking, two inter-satellite communication links of a networking satellite have the same transmitting and receiving frequency points and can be interchanged in orbit, the layout problem caused by the isolation design between the two communication links is solved, and the full-duplex inter-satellite communication system and method can work in a frequency division continuous wave communication or frequency division burst communication mode. According to the number of satellites, inter-satellite communication link transmit-receive frequency and working modes are set to ensure link establishment communication of the ring network, multiplexing is performed on the frequency synthesizer module, the intermediate frequency processing module and a radio frequency filter, an intermediate frequency filter and a mixer in the transmit-receive module, product integration is facilitated, and the problems of large product size, heavy weight and high cost are solved.

Systems and methods for uplink transmission timing are provided. In some embodiments, a method of operation of a wireless device in a cellular communications network includes receiving a transmission, from a network node, in a downlink slot; determining a reference uplink slot index in an uplink frame timing of the wireless device where the reference uplink slot index corresponds to the downlink slot in which the transmission was received; and transmitting an uplink transmission in response to the received transmission in an uplink slot a number of slots, K, after the determined reference uplink slot index. This may enable transmission in satellite radio access networks by establishing the transmission timing relationships that are suitable for long propagation delays and the large differential delay in a spotbeam in satellite communications systems that may range from sub-milliseconds to tens of milliseconds.