372 results about "Communications satellite" patented technology

A user equipment (UE) may access a public land mobile network (PLMN) via a communication satellite. The UE may receive satellite coverage data from the serving PLMN via the communication satellite indicating at which locations and / or at which times satellite coverage is available. The UE may determine, based on the satellite coverage data, a first time of satellite unavailability for a location of the UE and a second time of satellite availability. The UE may enter a no coverage state following the first time. The UE may inhibit mobile originating requests and / or reduce a frequency of satellite cell searching while in the no coverage state. The UE may leave the no coverage state at the second time. The satellite coverage data may comprise a coverage map for a grid of locations. Extra coverage data may be provided for satellite availability for other PLMNs and / or for terrestrial cells.

The invention relates to a low-orbit communication satellite Doppler positioning method and device based on factor graph optimization. The method comprises the following steps: after required observation data is received and an initial state value of a ground receiver is solved, a factor graph framework is introduced to set a priori factor, a Doppler frequency shift factor, a state constraint factor and a state variable consisting of a three-dimensional position and frequency drift of the receiver according to a Doppler positioning observation model; and constructing a Doppler positioning factor graph model by taking the factors and variables as nodes, introducing a sliding window mechanism to update a factor graph in a factor graph optimization solution process, and solving state variables by adopting a Gaussian-Newton algorithm to finally obtain a Doppler positioning result. According to the method, factor graph modeling is carried out on the Doppler positioning observation model, the advantages of nonlinear modeling, global optimization and capability of fully utilizing historical observation of a factor graph optimization method are exerted, and a relatively small positioning error and a higher convergence speed can be obtained.

The invention belongs to the field of microwave communication, and relates to a double-frequency microstrip circulator based on multi-layer material nesting, and the circulator comprises a substrate, a magnetic conductive sheet, a high dielectric ceramic, a high dielectric constant ferrite ring, a high magnetic saturation ferrite, a circuit layer, a ceramic sheet, and a permanent magnet. The magnetic conductive sheet is arranged at the bottom of the base body, the high-dielectric ceramic is arranged on the magnetic conductive sheet, the high-dielectric-constant ferrite ring is annularly embedded in the high-dielectric-constant ceramic, and the high-magnetic-saturation ferrite is embedded in the high-dielectric-constant ferrite ring. The circuit layer is arranged on the substrate consisting of the high dielectric ceramic, the high dielectric constant ferrite ring and the high magnetic saturation ferrite, the ceramic chip is arranged on the circuit layer, and the permanent magnet is arranged on the ceramic chip. The overall size is small, weight is light, and reliability is high; the working frequency range is wide, through different transformations, the system is not easily detected by enemies, the confidentiality is high, and the anti-interference capability is strong; the method can be widely applied to the fields of mobile communication, satellite communication, radar detection, electronic countermeasures and the like.

Methods and apparatus for obtaining a frequency offset corresponding to a Doppler shift of transmission and / or reception frequencies between a wireless device and a network node. In one embodiment a method is performed by a wireless device for operating in a non-terrestrial network, NTN, the NTN having at least one network node and a communication satellite, wherein the at least one network node is one of a terrestrial base station and a satellite base station or satellite gateway, the method includes obtaining a frequency offset corresponding to a Doppler shift of transmission and / or reception frequencies between the wireless device and the network node and applying the frequency offset to an uplink

A user device, a method, and a computer program product enable conditional requests by a user device based on predicting a radio link failure due to a terrestrial object. A communication subsystem of the user device receives communication service by a currently serving satellite of a constellation of satellites in low earth orbit (LEO). The serving satellite has a field of view encompassing a target area surrounding the user device. A controller of the communication device determines a location of the user device and tracks trajectories and corresponding fields of view of the constellation of LEO communication satellites. In response to predicting a radio link failure due to a terrestrial obstruction, the controller triggers completion of a conditional handover of radio link to a target satellite that is not predicted to have a radio link failure due to a terrestrial obstruction.

Techniques are disclosed for satellite-based wireless communication (SBWC) satellite visibility determination based on global navigation satellite system (GNSS) satellite visibility. The techniques can include identifying one or more visible GNSS satellites based on one or more received GNSS signals, estimating an orientation of a directional radio-frequency (RF) antenna based on respective expected positions of the one or more visible GNSS satellites, determining whether any of a plurality of SBWC satellites are visible based on the estimated orientation of the directional RF antenna, and initiating an SBWC communication procedure responsive to a determination that at least one SBWC satellite among the plurality of SBWC satellites is visible.

The invention relates to the technical field of emergency communication, in particular to a Beidou short message-based multi-mode emergency communication terminal, which comprises a Beidou communication module, a multi-source positioning unit, an information coding processor and a main control unit, the Beidou communication module is used for realizing short message communication with a Beidou satellite and supporting a BDS-3 protocol; the physical SOS button is provided with a mistaken touch prevention structure and comprises a mechanical pressing assembly with a triggering pressure threshold value larger than 2N and continuous pressing time verification logic; the multi-source positioning unit is used for acquiring position information including longitude, latitude and height; the information coding processor is configured to compress the collected help-seeking information to be within the capacity limit of a Beidou short message and generate a standard message of an emergency communication protocol; a standby power supply switching circuit is arranged in the main control unit, the main control unit is used for coordinating the work of each module and managing a power supply system, and the power supply system comprises a replaceable lithium thionyl chloride battery and a solar charging panel; and the low-power-consumption main control unit controls the Beidou communication module to transmit information to a Beidou communication satellite.

The invention relates to a control assembly and system for a QV frequency band feed antenna assembly of an Internet communication satellite and a control method of the QV frequency band feed antenna assembly. A control assembly of a QV frequency band feed antenna assembly used for an internet communication satellite comprises the QV frequency band feed antenna assembly and a motor used for driving the QV frequency band feed antenna assembly, the QV frequency band feed antenna assembly comprises a QV antenna, an antenna joint comprising an antenna rotating shaft and a connecting part connecting the QV antenna and the antenna joint, and the control assembly comprises a Hall sensor arranged at the connecting position of the antenna joint and the connecting part, the absolute position of the antenna rotating shaft is detected; the rotary transformer is arranged at one end of the motor to detect the single-circle absolute position of the motor; the motor controller is coupled with the Hall sensor and the rotary transformer in a communication manner so as to control the movement of the motor, and the motor controller is configured to perform fault detection on the Hall sensor and the rotary transformer respectively; determining an absolute zero position of the antenna rotating shaft based on a fault detection result; a position control mode of the QV band feed antenna assembly is selectively performed based on a result of the fault detection.

The invention provides a GEO communication satellite uplink signal Doppler frequency compensation method and device. The method comprises the following steps: acquiring a satellite orbit determination result corresponding to a GEO communication satellite; determining a Doppler compensation frequency curve according to the satellite orbit measurement result and the local frequency of the frequency conversion of a satellite transponder configured in the GEO communication satellite; and compensating a first uplink signal to be transmitted from the ground station to the GEO communication satellite by using the Doppler compensation frequency curve through the compensation frequency mixer, and transmitting the compensated first uplink signal to the GEO communication satellite. According to the invention, under the condition that the user receiver is non-inductive, the carrier frequency and the spreading code rate of the user receiver are changed in equal proportion, so that the user receiver can adopt a receiving algorithm of the carrier-assisted spreading code rate to improve the sensitivity.

The invention discloses a communication satellite multi-beam resource management and control method based on deep reinforcement learning, and belongs to the technical field of satellites. According to the invention, through the multi-agent reinforcement learning algorithm, the allocation strategy of the beam resources can be dynamically adjusted and optimized. A satellite antenna wave hopping technology and a time division multiplexing method are utilized to flexibly cope with changes of ground user requirements and communication flow, so that the overall throughput of a satellite link is remarkably improved. The dynamic optimization mechanism ensures efficient utilization of resources, and improves the transmission rate and quality of a communication system.

The invention provides a moving trajectory adjustment method and device and a storage medium, relates to the technical field of communication satellites, and can adjust the moving trajectory of a communication satellite according to the content of a first signal so as to avoid a flying object on an original moving trajectory. The operation of manual intervention is omitted, the communication satellite can autonomously avoid the flying object, and the communication satellite can effectively avoid the flying object in the first time in case of emergency. The method comprises the following steps: receiving a first signal, wherein the first signal comprises a signal obtained by reflecting a detection signal emitted by a communication satellite by a flying object and / or detection signals of other communication satellites; wherein the flying object and the communication satellite are in the same moving track; and adjusting the moving trajectory of the communication satellite according to the first signal.

The invention provides a multi-source rainfall prediction method and device fusing GNSS and communication satellites, and the method comprises the steps: building a plurality of satellite-ground microwave links which are used for transmitting GNSS data and communication satellite data; gNSS data and communication satellite data on the multiple satellite-ground microwave links are acquired; performing atmospheric rainfall inversion on the plurality of satellite-ground microwave links based on GNSS data, and constructing a two-dimensional water vapor field according to an inversion result; performing rainfall intensity inversion on the plurality of satellite-ground microwave links based on communication satellite data, and constructing a two-dimensional rainfall field according to an inversion result; and fusing the two-dimensional water vapor field and the two-dimensional rainfall field by adopting Bayesian-maximum posteriori estimation to obtain a fusion field, and converting the fusion field to obtain a rainfall prediction field. According to the method, the rainfall field and the water vapor field are fused for rainfall prediction, so that the whole rainfall process can be accurately predicted.

The invention discloses a C-band broadband antenna based on a double-layer metasurface, and belongs to the technical field of microwave communication. The antenna comprises an upper-layer dielectric substrate, a middle-layer dielectric substrate and a lower-layer dielectric substrate from top to bottom, a first metasurface layer is arranged on the upper surface of the upper-layer dielectric substrate, a second metasurface layer is arranged on the upper surface of the middle-layer dielectric substrate, a metal plate with a strip-shaped groove is arranged on the upper surface of the lower-layer dielectric substrate, and a tuning fork type T-shaped power divider is arranged on the lower surface of the lower-layer dielectric substrate. The T-shaped power divider comprises a main branch knot and two parallel branch knots, the branch knots are located under the strip-shaped groove, and the strip-shaped groove is perpendicular to the branch knots. Through a power divider and strip-shaped groove coupling excitation multi-resonance mode, in combination with cooperative regulation and control of the double-layer different-size metasurfaces, the excellent performance that S11 is smaller than-10 dB, the bandwidth is 34% and the maximum gain is 8.25 dBi is achieved within the frequency band of 4.568-6.141 GHz, and the ultra-wideband ultra-wideband antenna is suitable for 5G communication, satellite communication and Internet of Things equipment.

The invention discloses a task scheduling and energy consumption optimization system and method based on distributed satellite calculation, and the method comprises the following steps: obtaining the floating point calculation amount and data size of each subtask, obtaining the calculation power and link rate of each satellite, and calculating the estimated execution time of the subtasks on the satellites according to an execution time formula; further obtaining the calculation power, the communication power and the corresponding duration of each satellite, and estimating the total energy consumption through an energy consumption formula; and optimizing a task allocation scheme based on the energy consumption evaluation, thereby reducing the overall energy consumption of the satellite cluster.

The invention provides a network security one-way isolation system and method of a communication satellite system and electronic equipment, and relates to the technical field of communication, the network security one-way isolation system of the communication satellite system comprises a first one-way firewall, an intranet host system, a one-way gatekeeper, an extranet host system and a second one-way firewall, the intranet host system receives service data transmitted by the communication service network through the first one-way firewall, and performs format conversion processing on the service data to obtain internal interface data in a preset format supported by the one-way gatekeeper, so as to send the internal interface data in the preset format to the one-way gatekeeper, and the one-way gatekeeper forwards the data to the extranet host system; and the external network host system recovers the internal interface data in the preset format into service data, and sends the recovered service data to the external network through the second one-way firewall. According to the system, a multi-stage deep security protection framework of a two-stage firewall and a one-stage one-way gatekeeper is adopted, so that the network security of a communication service network is ensured.

The invention provides a performance evaluation method and system of an LEO satellite assisted deep space communication system, the LEO satellite assisted deep space communication system comprises a detector, an LEO satellite and a ground terminal, the detector and the LEO satellite communicate through an FSO link, the LEO satellite and the ground terminal communicate through an RF link, and the LEO satellite is connected with the ground terminal. The method comprises the following steps: in a design stage of an LEO satellite-assisted deep space communication system, obtaining index parameters influencing FSO link communication quality, including a corona turbulence intensity parameter, a pointing error parameter and a solar noise parameter; the index parameters comprise a shadow intensity parameter, an LEO satellite position parameter and a molecular absorption coefficient; the index parameters are input into a constructed deep space communication system performance evaluation model, performance indexes are obtained, and the performance indexes comprise the outage probability, the channel capacity and the bit error rate; and evaluating the performance of the deep space communication system according to the performance index. The method can evaluate the performance of the deep space communication system more comprehensively and accurately.

The invention discloses a cross-satellite communication method for a high-dynamic terminal. The cross-satellite communication method comprises the following steps: a satellite carries out bidirectional communication with a terminal and a terminal control station; the satellite forwards terminal service information to the terminal control station, and forwards terminal control station preset information and signaling information to the terminal; according to the preset information and the signaling information, the terminal dynamically judges whether cross-satellite switching needs to be initiated or not; if cross-satellite switching needs to be carried out, the terminal changes parameters according to the content of the signaling information to realize communication with a target satellite, and the target satellite forwards terminal service information to a terminal control station; meanwhile, terminal state information is updated and sent to the terminal control station, and the whole cross-satellite communication process is completed. According to the invention, on the premise of ensuring continuous and reliable cross-satellite communication, the cross-satellite communication process is simplified, and a self-adaptive coding modulation mode is adopted in an uplink, so that cross-satellite rapid switching and efficient communication of the high-dynamic terminal in a satellite networking scene are realized.

The present invention belongs to the field of marine underwater positioning, navigation and timing. Disclosed are an underwater navigation and communication integrated position service system and method. The system comprises a buoy base station, a submerged buoy base station, a seabed base station and a shore-based operation and control unit, and the system utilizes a three-dimensional base station network observation mode combining the buoy base station, the submerged buoy base station and the seabed base station. The position service system and method in the present invention have the capabilities of underwater acoustic navigation and communication, satellite positioning and communication, atomic clock timekeeping, hydrological measurement and responding to instructions of a shore-based operation and control unit, have the functions of autonomous, real-time and online base station position and clock calibration and sound velocity field correction, have the functions of base station position and clock calibration, and sound velocity field correction and control based on the shore-based operation and control unit, and can expand the range and functions of underwater position services, and provide accurate positioning, navigation and timing services for water-surface / underwater users.

The invention discloses an Internet of Things information transmission method and system in a low earth orbit satellite Internet of Things, and relates to the technical field of Internet of Things, and the method comprises the steps: each Internet of Things terminal generates a corresponding pilot frequency sequence according to the ID of the terminal, and builds a quantum key between the Internet of Things terminal and a satellite terminal; collecting data needing to be transmitted through a sensor data interface, and performing primary encryption and secondary encryption on the data by using the established quantum key; the attitude and course information of the vehicle is monitored in real time, and the pitching and azimuth angles of the two-dimensional phased-array antenna are adjusted according to the position of the synchronous satellite; sending the finally encrypted data to a middle and low orbit communication satellite through the adjusted two-dimensional phased-array antenna, and monitoring the link quality in real time; according to the method, a three-layer heterogeneous encryption mechanism is combined with quantum physical characteristics, so that the confidentiality in a data transmission process is improved, and the resistance to quantum attacks is enhanced by using advanced algorithms such as lattice cryptography and the like.

The invention provides a low-orbit satellite ground terminal air interface performance test method and device, and the method comprises the steps: calculating satellite position data observed by a to-be-tested ground terminal at different moments according to a preset ground terminal position and low-orbit communication satellite ephemeris data, and generating a visible satellite motion track of the ground terminal position; selecting a preset number of track points on the visible satellite motion track as test points, and importing satellite position data of the test points into a test system; when the measurement antenna moves to the first test point, satellite position data corresponding to the first test point is transmitted back to the ground terminal to be tested; the to-be-tested ground terminal generates wave beams according to the received satellite position data, connection is established, and the test system completes air interface wireless performance measurement of the first test point; all the test points are traversed through the processing process, air interface wireless performance measurement of the ground terminal to be tested is completed, and air interface wireless performance measurement results corresponding to all the test points are obtained.

The invention relates to a dynamic path prediction method for satellite antenna tracking and computer equipment, and the method comprises the steps: collecting satellite antenna tracking angle data which comprise original data and actual data; calculating a first deviation sequence and a second deviation sequence based on the original data and the actual data; performing curve fitting on the first deviation sequence and the second deviation sequence through a fitting algorithm, substituting a fitting result into a pre-constructed mathematical model to obtain a prediction model, and extrapolating and predicting a prediction deviation of a preset time point through the prediction model; and compensating the predicted deviation to original data corresponding to the preset time point, and generating a dynamic range instruction, so that the satellite antenna is aligned with the communication satellite under the action of the dynamic range instruction. And the satellite antenna can continuously align to the real position of the communication satellite.

The invention discloses an antenna layout method for a communication satellite. The antenna layout method comprises the following steps: S1, determining directions of antennas in an unfolded state and a spatial relationship between the antennas; s2, adjusting the relationship between the assembly and the satellite platform, and ensuring that the field of view of the antenna is not shielded in an unfolded state; s3, the relation between the antennas and the satellite platform in the folded state is adjusted, and it is guaranteed that no interference exists between the antennas and between the antennas and the satellite platform in the folded state; s4, solving a rotation axis unit vector and a rotation angle of the antenna; if the first constraint judgment condition is not met, returning to the step 2; if yes, executing the step 5, and rotating according to the rotating shaft unit vector and the rotating angle to obtain a corrected layout position; 6, if the second constraint judgment condition is not met, returning to the step 2; and if yes, outputting a result. According to the method provided by the invention, the antenna layout which meets the use requirements of an antenna system, the internal space envelope of a fairing and the size limitation of a satellite platform can be obtained.

According to the self-adaptive adjustment signal receiving system and method, interference signals are autonomously identified through background signal acquisition and processing, and then parameters such as receiving frequency, bandwidth and gain of a broadband frequency conversion module are adaptively optimized and adjusted to improve the capability of resisting intentional or unintentional interference, so that the bandwidth for receiving and processing the signals can be effectively expanded, and the signal quality is improved. A broadband input signal adaptive adjustment function required by a flexible load communication satellite system is realized, and channelization processing, demodulation, data merging, modulation, digital-to-analog conversion and other functions can be carried out on each signal processing channel. And meanwhile, actions such as analog-to-digital conversion of intermediate-frequency signals, spectrum processing, interference identification, frequency band comparison, adjustment of receiving parameter instruction generation and the like are realized according to the conversion of the working modes.

The invention relates to an in-orbit calibration method for an uplink phased-array antenna of a low-orbit communication satellite, and belongs to the technical field of satellite testing. According to the method, pointing measurement and calibration of an uplink phased-array antenna of a low-orbit communication satellite are taken as input, and measurement and calibration of beam pointing of the uplink phased-array antenna are realized through test and data processing of G / T values of multiple beams of the uplink phased-array antenna. The method has the functions of calibration signal generation, beam G / T test, beam stereo directional diagram reconstruction, pointing deviation measurement and beam pointing adjustment. Simulation experiments show that the calibration method designed by the invention can effectively reduce the beam pointing deviation of the uplink phased-array antenna of the low-orbit communication satellite.

To secure a communication environment between a watching satellite and a ground facility in a group of earth orbiting satellites, and to enable information transfer between a user satellite and the ground facility.SOLUTION: A communication satellite 401 is used for a satellite watching system in which a watching satellite and a watching center perform information transfer through a group of communication satellites. The communication satellite 401 includes a first communication device 41 to perform communication with a ground facility and three second communication devices 42 to perform communication among infrastructure satellites. The communication satellite 401 performs communication with a communication satellite flying on the same orbital plane, the watching satellite, or a user satellite simultaneously.SELECTED DRAWING: Figure 15

Systems and methods are described herein for providing a direct radiating antenna (DRA) for installation on a communication satellite. The DRA is a phased array of microstrip patch antennas implemented in a very compact profile on a planar substrate. Embodiments of array are implemented as an array of radiating element configurations, each having a microstrip radiating element (e.g., a square patch) coupled to a first side of the planar substrate, amplifiers coupled to a second side of the planar substrate, and filters (e.g., diplexers) coupled between the radiating elements and amplifiers. A thermal conduction layer (e.g., a graphoil or vapor chamber layer) is thermally coupled with the second side of the planar substrate, and a thermal radiation layer (e.g., an optical solar reflector) is thermally coupled with the thermal conduction layer.

An information processing device, method, and program are provided that reduce communication costs and the occurrence of communication delays while maintaining communication quality. [Solution] The information processing device 4 in the aircraft has a communication unit 41 that communicates with the aircraft using either ground communication equipment or a communication satellite, an acquisition unit 431 that acquires status information for identifying the status of the aircraft, an estimation unit 432 that estimates the execution time for switching between ground communication equipment and the communication satellite based on the status of the aircraft identified by the status information acquired by the acquisition unit and a ground communication quality map, a connection processing unit 433 that executes processing to establish a connection with the other equipment, either the ground communication equipment or the communication satellite, which is currently being used for communication with the aircraft, on the condition that the current time has passed a time before a predetermined period from the execution time estimated by the estimation unit, and a switching processing unit 434 that executes processing to switch to the other equipment based on the execution time estimated by the estimation unit.

A satellite provides communication between user terminals (UTs) and ground stations that connect to other networks, such as the Internet. The satellite uses a direction beam to transmit a beacon signal to particular areas on the Earth. To establish initial contact with a satellite, a UT searches for the beacon signal using a phased array or other steerable antenna with a directional receive pattern. While searching, a set of received beacon signal strength values are acquired while pointing the receive pattern in different sample directions specified by azimuth and elevation. The sample directions may be based on a predicted location of the satellite. The set of signal strength values and associated azimuth and elevation values are processed using a least-squares estimator to determine an estimated direction. The estimated direction may be used to point the antenna, allowing sufficient gain to perform an initial network entry and subsequent communication.

Disclosed in the present application is a communication satellite handover method. The method comprises: performing grouping processing on a plurality of user equipments to obtain a grouping result; and for each group, when a handover condition is met, executing communication satellite handover for the group, wherein the communication satellite handover for the group comprises: a group head device performing handover from a source satellite to a destination satellite by means of RACH handover, and in response to the trigger of the group head device, group member devices performing handover from the source satellite to the destination satellite by means of RACH-less handover, which group member devices are other user equipments in the group other than the group head device. The present application solves the technical problems in the prior art of network congestion, handover interruption and handover delay increases caused by great signaling overheads during communication satellite handover.

The invention discloses a satellite orbit determination method and device, a storage medium and electronic equipment. The method comprises the following steps: acquiring an initial satellite position of a target communication satellite under the condition that the target communication satellite can receive a navigation signal, and determining a reference orbit of the target communication satellite based on spatio-temporal information of a navigation satellite; obtaining a target satellite position and a target non-conservative force model coefficient through orbit fitting; performing orbit integration to determine an integration orbit; comparing the integral orbit with the reference orbit to determine a position error sequence and process noise covariance information; and under the condition that the target communication satellite cannot receive the navigation signal, performing orbit filtering by using the inter-satellite link data, and determining a target operation orbit. The technical problem that a satellite cannot run according to a correct orbit due to the fact that a satellite constellation integrally deviates and rotates is solved.