106 results about "Communications satellite" patented technology

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 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.

A communication method and a related apparatus. In the method, on the basis of a reference signal reception timing difference between a first cell and a second cell, ephemeris information of a first satellite and ephemeris information of a second satellite, a terminal may calculate position information of the terminal. In this way, for terminals that lack a GNSS positioning capability or terminals that are currently unable to acquire the positions thereof by means of GNSS signals, positioning of the terminals can be realized. In addition, the first satellite and the second satellite in the present application are communication satellites, and compared with the signal strength of GNSS signals transmitted by GNSS satellites, the signal strength of positioning reference signals transmitted by the first and second satellites in the present application is stronger. Therefore, the positioning reference signals are less susceptible to environmental interference, thereby facilitating an improvement in the accuracy of terminal positioning.

The invention discloses a communication method and a related device, and the method comprises the steps: a terminal can calculate the position information of the terminal according to the receiving timing deviation of reference signals of a first cell and a second cell, the ephemeris information of a first satellite, and the ephemeris information of a second satellite; therefore, the position positioning of the terminal without GNSS positioning capability or the terminal which cannot obtain the position of the terminal itself through the GNSS signal at present can be realized. Besides, the first satellite and the second satellite in the application are communication satellites, and compared with the signal intensity of GNSS signals sent by GNSS satellites, the signal intensity of the positioning reference signals sent by the first satellite and the second satellite in the application is higher, so that the positioning reference signals are not easily influenced by the environment, and the accuracy of terminal positioning is improved.

The invention discloses a time synchronization method and device applied between a ground control center and a low-orbit communication satellite, and aims to solve the technical problem that a satellite loses the time synchronization capability due to the failure of a global navigation satellite system (GNSS) component in the prior art. The method comprises the following steps: when a GNSS component works normally, a low-orbit satellite is mainly used for GNSS timing; and when the GNSS component is detected to be invalid or the signal is not stable, the system is automatically switched to a standby calibration mode. In the standby mode, the method utilizes a remote control instruction sent by a ground control center or a ground timestamp attached in a data packet, and combines a time drift prediction model constructed based on historical correction data to perform high-precision correction on a satellite local clock. By supporting a multi-mode time calibration strategy, the fault-tolerant capability and the time synchronization precision of the system under an extreme working condition are remarkably improved, so that the risk caused by time asynchronization in satellite task execution is reduced.

The invention belongs to the technical field of communication satellite measurement and control technologies, and provides a satellite measurement and control system based on multi-modal fusion, which comprises a multi-modal signal fusion module used for receiving measurement and control data, fusing information from a plurality of signal sources, carrying out data time and space alignment and establishing a state estimation equation for prediction, outputting accurate satellite state data; the intelligent orbit prediction module is used for predicting the orbit of the satellite in real time and calculating the future change of the satellite orbit according to the received satellite state data and external information; the satellite control module is used for controlling and adjusting the orbit and attitude of the satellite in real time, and running the satellite according to the preset orbit and attitude through monitoring and control; and the task planning and instruction scheduling module is used for planning and scheduling satellite tasks, generating corresponding instructions according to task requirements, and reasonably allocating resources by scheduling and evaluating various indexes of satellites so as to enable the instructions to be executed on time.

The provided are a digital currency wallet management method, apparatus, and system, remote control method, apparatus and system for a digital currency wallet which relate to the field of computer technologies. A method includes: detecting a connection state with a digital currency platform; obtaining a current moment by means of a communication satellite in a case that the connection state with the digital currency platform indicates an offline state; calculating an offline duration according to the current moment and a self-saved last synchronization moment; determining whether the offline duration is greater than a preset offline duration; and in a case that it is determined that the offline duration is greater than the preset offline duration, generating a wallet key information set, and sending the wallet key information set to the digital currency platform, so that the digital currency platform synchronizes and processes the wallet key information set.

A method for network data communication includes, at a terrestrial computing device, detecting one or more beacon signals from a corresponding one or more orbital communication satellites of a constellation of orbital communication satellites. A transmission probability threshold is adjusted based at least in part on a detected quantity of the one or more orbital communication satellites. Data is transmitted from the terrestrial computing device to the constellation of orbital communication satellites contingent on the transmission probability threshold being satisfied.

Disclosed are a method performed by a first entity in a core network for serving a public land mobile network (PLMN) for supporting satellite radio access of a user equipment (UE) to the PLMN, the method comprising: receiving a location request from a second entity in the core network, wherein the position request indicates that the UE has communication satellite access; determining a location of the UE using at least one of a UE-assisted positioning method and a network-based positioning method; and providing a location response to the second entity, the location response including the location.

This invention discloses a C-band broadband antenna based on a double-layer metasurface, belonging to the field of microwave communication technology. The antenna comprises, from top to bottom, an upper layer, a middle layer, and a lower layer dielectric substrate. The upper dielectric substrate has a first metasurface layer on its upper surface, the middle dielectric substrate has a second metasurface layer on its upper surface, and the lower dielectric substrate has a metal plate with a stripe groove on its upper surface and a tuning fork-type T-shaped power divider on its lower surface. The T-shaped power divider includes one main stub and two parallel branch stubs, with the branch stubs located directly below the stripe groove, which is perpendicular to the branch stubs. This invention achieves excellent performance in the 4.568 to 6.141 GHz frequency band by coupling the power divider with the stripe groove to excite multiple resonant modes, combined with the synergistic control of the double-layer metasurface of different sizes. This results in an S11 < -10 dB, a bandwidth of 34%, and a maximum gain of 8.25 dBi, making it suitable for 5G communication, satellite communication, and IoT devices.

A rescue positioning system is provided. The rescue positioning system includes a first rescue positioning device, a communication satellite and a backend monitoring device. The first rescue positioning device includes a communication module, a detection module, a processor and a positioning module. The detection module detects location and environment information of the first rescue positioning device and generates a detection signal. The processor generates a distress signal when the processor determines that the location and environment information is abnormal according to the detection signal. The positioning module obtains a location coordinate of the first rescue positioning device. As the processor generates the distress signal, the processor controls the communication module to transmit the distress signal and the location coordinate to the backend monitoring device through the communication satellite, and the backend monitoring device notifies a rescue person to proceed to a location of the first rescue positioning device for rescue.

The invention discloses a visibility prediction method for a low-orbit communication satellite, a terminal and a storage medium. The method comprises the following steps: initializing terminal parameters and target constellation parameters; acquiring ephemeris data of a corresponding satellite based on the target constellation parameter; calculating precession parameters of a satellite orbit in combination with the ephemeris data and the terminal parameters; distributing reference satellites for each orbit of the constellation according to the precession parameters; and predicting the visibility of all satellites of the constellation to the terminal based on the reference satellite and the terminal parameters. According to the method, the reference satellite represents the motion characteristics of the whole orbital plane, so that the calculation complexity of visibility prediction is remarkably reduced, and efficient and rapid prediction of the visibility of the low-orbit communication satellite is realized.

This application relates to a satellite-to-ground frequency synchronization system and method. The system includes: a communication satellite transponder for receiving uplink signals transmitted by a ground synchronization system, generating a beacon signal and a first downlink signal, combining the first downlink signal and the beacon signal to obtain a combined signal, and then transmitting the combined signal back to the ground synchronization system; and a ground synchronization system for receiving the combined signal, separating the combined signal to obtain the first downlink signal and the beacon signal, eliminating phase drift of the first downlink signal based on the beacon signal to obtain a second downlink signal, and determining uplink phase compensation, downlink phase compensation, and beacon phase compensation based on the second downlink signal and the uplink signal. These uplink phase compensation, downlink phase compensation, and beacon phase compensation are then used for signal phase compensation during subsequent signal transmission and reception. This method can eliminate phase drift of onboard crystal oscillators and improve satellite-to-ground frequency synchronization accuracy.

The application discloses a satellite quantum communication system and method based on hour-level quantum storage, wherein the system comprises: a quantum communication satellite payload end for generating entangled photon pairs, which are independently sent to corresponding satellite ground stations; two satellite ground stations for obtaining symmetric keys from the entangled photon pairs, and performing information encryption and quantum communication by using the symmetric keys; specifically, the weather is monitored, and it is judged whether the entangled photons can effectively pass through; if yes, the transit satellite is tracked, the entangled photons are received and measured by a measurement module to obtain the symmetric keys; if not, a UAV is started, the entangled photons are received and stored in the hour-level quantum storage module, after the satellite transits, the UAV returns to the satellite ground station, the entangled information in the quantum storage is read and measured to obtain the symmetric keys. The application can effectively improve the real-time performance and security of quantum key distribution.

This invention belongs to the field of wireless communication technology and discloses a method and system for power and polarity joint coding in space-air-ground networks, mainly applicable to satellite-to-ground communication scenarios. The satellite, as the signal transmitter, forms a basic communication pair with a ground station; their communication is basic communication. The satellite also forms supplementary communication pairs with other ground stations or near-ground stations, utilizing the basic communication to achieve supplementary communication. The basic and supplementary communication pairs share channel state information; the basic communication transmitter designs a transmit precoding matrix, a power coding vector, and a polarity coding vector; the basic communication user designs a receive filter matrix to recover the basic communication data vector from the observed basic communication signal; the supplementary communication user designs a receive filter matrix to recover the supplementary communication data vector from the observed signal. This invention requires no additional communication resource consumption and can effectively improve spectrum utilization efficiency and the number of concurrent communications supported by the system.

Transparent optical repeater for satellite, and communication satellite including such a repeater. This transparent optical repeater, configured for onboard use on a satellite, comprises: - an optical fiber (OF) assembly; - a first optical head (OHU1); - a first low-noise optical amplifier (LNOA); - a polarization splitter and controller (PCS) comprising, for each output channel of the bandpass filter (BPF), a channel polarization splitter and controller (C-PCS); - a third high-power optical amplifier (HPOA), per output channel of the polarization splitter and controller (PCS); - a polarization combination unit (PBC), configured to recombine the respective output channels of the two optical multiplexers (HPWDM); and - a second optical head (OHU2) configured to output the optical signals from the output of the polarization combination unit (PBC). Figure for the abstract: [Fig. 4]

The invention discloses a method for reducing storage and calculation amount in electromagnetic scattering non-singularity solution of a rotating body, and belongs to the field of electromagnetic engineering. According to the method, on the basis of a moment method (MoM) theoretical framework, an auxiliary function is introduced to eliminate the influence of Green function singularity in a surface integral equation on numerical calculation, and meanwhile, the physical constraint that the electric field divergence of a passive area is zero is further combined, so that effective order reduction of an unknown quantity is achieved; a traditional four-variable integral equation set is simplified into a three-variable coupled wave equation, the order and storage requirements of an impedance matrix are remarkably reduced, and the solving efficiency is greatly improved while the calculation precision is guaranteed. A specific electromagnetic rotating body device model is used for simulation, numerical verification shows that the method has excellent performance in calculation of an electromagnetic scattering field of a typical rotating body structure, and an efficient and reliable technical means is provided for rapid electromagnetic calculation of engineering equipment such as spherical communication satellites and missile nose cones.

A unified data library is referred to by a surveillance satellite group to track a flying object, a surveillance ground facility to control the surveillance satellite group, a communication satellite group to transfer flying object information acquired by the surveillance satellite group, a communication ground facility to control the communication satellite group, a coping asset to cope with the flying object, and a coping ground facility to control the coping asset. The unified data library includes a database having stored therein orbit information of the surveillance satellite group, orbit information of the communication satellite group, position information of the coping asset, and a plurality of flying path models having flying paths of the flying object modeled therein.

The utility model provides an intelligent organ transfer system. The system is composed of an organ transfer box, a control unit, a ground 5G base station, a transfer unmanned aerial vehicle and a communication satellite. The control unit can communicate with the transfer unmanned aerial vehicle through a ground 5G base station or a communication satellite and can also communicate with a ground mechanism at the same time. A microprocessor and a plurality of functional modules, such as a key module, an image recognition module and various sensors, are integrated in the device. The transfer unmanned aerial vehicle is provided with an anti-collision radar, an anti-explosion shell and a stealth coating, and is further provided with a 360-degree panoramic camera, so that the transportation safety can be guaranteed, and the transfer process can be recorded. Environmental parameters in the transfer process are monitored in real time through the sensors, and an alarm is given through the audible and visual alarm when abnormity occurs. The image recognition module adopts a face recognition camera module, password input is combined with the key module, and opening safety of the transfer box is guaranteed. The system effectively solves the problem of organ transfer in a complex environment, ensures safe and efficient organ transfer, and improves the success rate of organ transplantation.

The invention discloses a communication anti-interference antenna and navigation equipment, and relates to the technical field of communication, the communication anti-interference antenna comprises an antenna array module and a control system in electric signal connection with the antenna array module, the control system is configured to filter original interference signals, and the original interference signals are interference signals generated by a default interference source; receiving an initial radio frequency signal of a communication satellite; acquiring a radio frequency signal of a specified frequency band in the initial radio frequency signal to serve as a target intermediate frequency signal, and converting the target intermediate frequency signal into a digital signal; and filtering a newly added interference signal in the digital signal to obtain a target radio frequency signal. According to the technical scheme provided by the invention, the default original interference signal can be filtered before the antenna receives the radio frequency signal, and then the received radio frequency signal is subjected to anti-interference processing, so that part of resources are saved for processing the newly added interference signal, the anti-interference process of the communication antenna during signal receiving is simplified, and the positioning effect of the antenna is improved.

Techniques for satellite-based wireless communication (SBWC) satellite visibility determination based on global navigation satellite system (GNSS) satellite visibility are disclosed. The technique may 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 the respective expected positioning of the one or more visible GNSS satellites; determining whether any one of the plurality of SBWC satellites is visible based on the estimated orientation of the directional RF antenna; and initiating an SBWC communication process in response to determining that at least one SBWC satellite of the plurality of SBWC satellites is visible.

The invention discloses a rotational inertia test method for a high-precision heavy remote sensing communication satellite, and the method comprises the steps: enabling a to-be-tested heavy remote sensing communication satellite to be stably installed on an objective table of a torsion platform through a special tool adaptive to a satellite structure, and calibrating the attitude of the satellite through a gradienter and a laser locator auxiliary device in the installation process, it is ensured that the center of mass of the satellite is accurately located on the measuring shaft of the torsional pendulum table, and test errors caused by center-of-mass offset are avoided. According to the rotational inertia test method for the high-precision heavy remote sensing communication satellite, non-contact bearing is realized by adopting an air floatation supporting structure formed by static pressure gas bearings, and a test precision foundation is laid from the hardware level; in a data acquisition and processing link, a torsional pendulum vibration signal is captured through high-resolution displacement sensing equipment, a refined signal analysis means is combined, curve fitting is carried out from preliminary recognition of a vibration wave crest to interception of a key data interval, an accurate wave crest moment is positioned through mathematical derivation, and an original data error is greatly reduced.

A communication module (16) is provided with a mounting unit for attachment to a bicycle (12), a near communicator for establishing a near communication channel (22) with a communication system (24) of a motor vehicle (14) and a far communicator for establishing a far communication channel (26) with a communication satellite (28), wherein a positioning system for determining a location of the communication module (16) is provided and the location can be transmitted to the communication system (24) of the motor vehicle (14) both by means of the near communicator via the near communication channel (22) and by means of the far communicator via the far communication channel (26).The redundant terrestrial and orbital communication with the communication system (24) of the motor vehicle (14) allows for an appropriate response to an emergency without unnecessary rescue operations, thus enabling easy receipt of appropriate help in an emergency situation.

To realize the tracking of a gliding stage in a missile which repeats jetting intermittently.SOLUTION: When a monitoring satellite 307 having a plurality of monitoring devices detects a significant high-temperature object, the monitoring satellite 307 transmits flying object information to a satellite integrated command center 810 via a satellite information transmission system 403 having a plurality of communication satellites 308. The flying object information includes detected time information, a monitoring satellite ID, a monitoring device ID, and monitoring data. The satellite integrated command center 810 transmits the flying object information to a countermeasure system 405 including a countermeasure asset 801 and a countermeasure ground center 802. The trajectory prediction device 803 derives the position information and the traveling direction of the monitoring satellite having the ID at the detection time in the flying object information, and the line-of-sight direction of the monitoring device having the ID. Then, the trajectory prediction device 803 extracts the high-temperature object luminance from the monitoring data and derives a line-of-sight vector directed to the high-temperature object.SELECTED DRAWING: Figure 9

The application discloses a preparation method of low-dielectric-loss high Q × f value lithium titanate-based microwave dielectric ceramic material and a product thereof.The application takes Li2CO3, TiO2, Sc2O3 and Nb2O5 as raw materials, substitutes Ti in Li2TiO3 with (Sc 1 / 2Nb 1 / 2 ) 4+ , forms a lithium titanate-based microwave dielectric ceramic material with a chemical formula of Li2Ti 4+ (Sc 1‑x Nb 1 / 2 ) 1 / 2 x O3, effectively adjusts the phase structure of the microwave dielectric ceramic, optimizes the temperature frequency characteristics and dielectric loss, and obtains excellent comprehensive microwave dielectric performance with moderate dielectric constant, super high Q × f value and near-zero resonance frequency temperature coefficient, so that the lithium titanate-based microwave dielectric ceramic material has great application potential in the fields of next-generation mobile communication and satellite communication.

This application provides a multi-source rainfall prediction method and apparatus that integrates water vapor and rainfall fields. The method includes: establishing multiple satellite-to-ground microwave links for transmitting GNSS and communication satellite data; acquiring GNSS and communication satellite data from these links; performing atmospheric precipitability inversion on each of the multiple links based on the GNSS data, and constructing a two-dimensional water vapor field based on the inversion results; performing rainfall intensity inversion on each link based on the communication satellite data, and constructing a two-dimensional rainfall field based on the inversion results; fusing the two-dimensional water vapor and rainfall fields using Bayesian variational inference to obtain a fused field, and then transforming the fused field to obtain a rainfall prediction field. This method accurately predicts the entire rainfall process by integrating the rainfall and water vapor fields.

The application discloses an emergency communication satellite mobile broadband three-network fusion system, and relates to the technical field of wireless communication networks, comprising: a multi-mode fusion access gateway, which is used for providing communication interfaces with a telecommunication network, a Unicom network, a mobile network, a satellite broadband network and an ad hoc network node; and a six-dimensional state sensing unit, which is used for collecting six-dimensional network state data in time domain, frequency domain, space domain, energy domain, service domain and environment domain. The emergency communication satellite mobile broadband three-network fusion system realizes five-dimensional heterogeneous network resource collaborative scheduling of the telecommunication network, the Unicom network, the mobile network, the satellite broadband network and the ad hoc network node; the system can sense the network state evolution trend in advance, quantitatively evaluate the reliability of the prediction result, and spontaneously evolve to the state with the most balanced resource utilization and the highest overall order in the multi-network collaborative process, so that the fusion efficiency of multi-system networks in a dynamic environment is effectively improved.

This application provides a satellite terminal satellite search method, apparatus, device, storage medium, and program product. The method includes: acquiring prior satellite information, which is multi-dimensional information of a pre-trained communication satellite, including beam dwell time-domain information representing the dwell time of the communication satellite's transmitted beam at different locations on the ground; acquiring the geographical location information of a user terminal; determining the target dwell time-domain information of the communication satellite's beam based on the prior satellite information and the geographical location information; determining the target search period for the user terminal based on the target dwell time-domain information; and controlling the user terminal to perform periodic signal searches according to the target search period, so as to establish a communication connection between the user terminal and the communication satellite. This method aims to improve the satellite terminal's satellite search efficiency.

This invention provides an automated testing and interpretation system and method for the downlink radio frequency performance of regenerative processing payloads on communication satellites, including a hardware platform and a control unit. The hardware platform is used to construct a satellite-to-ground radio frequency link and supports remote control. The control unit carries main control software to control the hardware platform to perform the following functions: loading and executing predefined test sequences to initiate the test process; sending remote control commands to set the satellite payload status via power supply control equipment or requesting command permissions from the satellite platform; receiving and parsing satellite telemetry to confirm whether the status meets the requirements; remotely controlling general-purpose test instruments to perform automatic testing, acquiring test data, and automatically interpreting and recording it based on predefined templates; and automatically storing remote control commands, telemetry data, and test data in a time sequence to a database. Thus, this invention achieves one-click automated testing and interpretation of the downlink radio frequency performance of satellite processing payloads, improving efficiency, reducing cost and error rate, and possessing versatility and scalability.