175 results about "Communications satellite" patented technology

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 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 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.

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.

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 method and device for reducing power consumption of a satellite terminal and electronic equipment. The method comprises the following steps: acquiring the original transmitting power of a satellite terminal; the original transmitting power is adjusted through a power control system, the target transmitting power of the satellite terminal is obtained, and the power control system is used for dynamically adjusting the transmitting power of the satellite terminal; determining a target working voltage of the satellite terminal according to the target transmitting power; the target power consumption of the satellite terminal for data communication under the target transmitting power and the target working voltage is determined, and the target power consumption is smaller than the corresponding original power consumption of the satellite terminal under the original transmitting power. According to the communication satellite terminal, the technical problem that energy consumption is too high due to too high transmitting power or too high working voltage during long-time communication of a traditional communication satellite terminal is solved.

A center shaft of a feed source and an X-axis stator of a base are coaxial and jointly fixed on an X-axis base, an X-axis drives an auxiliary reflector, a Y-axis and a main reflector to rotate jointly, the Y-axis drives the main reflector to rotate relative to the auxiliary reflector, microwave signals are emitted from the feed source and reflected to the main reflector through the auxiliary reflector with an included angle of 45 degrees, and the microwave signals are reflected to the main reflector through the auxiliary reflector with the included angle of 45 degrees. The first reflection microwave direction rotates along with the X axis, and the second reflection microwave direction rotates along with the Y axis; the microwave signal receiving process is opposite; when the antenna is launched, the antenna is folded, and the Y-axis driving shaft and the main reverse fixed assembly rotate reversely together, and are pressed on a satellite deck by a pressing point. A plurality of rotating joints and connecting waveguides of a two-dimensional mechanism are omitted, feed line loss is greatly reduced, efficiency is improved by more than 30% under the same caliber, weight is reduced by more than 40%, control over main and auxiliary reverse installation precision of the mechanism is greatly simplified, and the mechanical environment of a satellite launching section can be met.

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 provides a communication satellite verification system based on a general virtual test environment. The communication satellite verification system comprises a service subsystem and virtual test equipment, the service subsystem comprises a power supply and distribution subsystem ground device, a measurement and control and comprehensive electronic subsystem ground device, a thermistor equivalent device, a general control device with an MTP server and the like, and the general control device is responsible for telemetering data processing and remote control instruction scheduling; and the virtual test equipment is connected with the service subsystem, is used for simulating a satellite-borne software operation environment and a satellite-borne load to form a closed-loop test, comprises a plurality of simulation modules such as orbit and attitude dynamics, and respectively realizes orbit attitude parameter calculation, software code operation simulation and circuit box function simulation so as to test a satellite or a verification platform. The invention further provides a satellite-borne software verification method. Therefore, communication satellite verification can be carried out under the virtual condition, the test comprehensiveness can be ensured, and the test cost can be 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 application discloses a general service method and system applied to a satellite platform and belongs to the field of remote sensing / communication satellite platforms, and solves the technical problems that in the prior art, due to the need of new load access for new adaptability development and test work, a long development cycle is caused, and under the condition that test is not comprehensive, there is a risk of load service failure, and maintenance is difficult. Step 1, a general service template table is constructed; step 2, after the general service template table is filled in, the general service template table is converted into satellite on-service instructions; and step 3, a general service program is designed and is used for executing the satellite on-service instructions. The application is used for realizing the general service method without special customization development for different loads.

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.

In exemplary embodiments communication resiliency methods and systems for tribal ground stations may be described. An exemplary communication system may include a first ground station and a second ground station. The first ground station and the second ground station may be located on one or more tribal reservations. The first ground station and second ground station may be connected to a satellite. The satellite may be, for example but not limited to, geostationary (GEO) satellites, mid earth orbit (MEO) satellites, low earth orbit (LEO) satellites, polar orbiting satellites, and / or communication satellite constellations. In some embodiments the satellite may be a LEO satellite that provides direct communication between the first ground station and the second ground station.

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 portable communication buoy for deep sea, which comprises a support, a buoy base fixed on the support and in data communication with a deep sea device, and a communication buoy fixed on the buoy base; the buoy base is provided with an optoelectronic data converter for converting data of the deep sea device into optical signals; the communication buoy comprises a buoy with a data storage function and a communication antenna for transmitting data to a communication satellite; the buoy is provided with a transmission window which can be penetrated by the optical signals, and the transmission window is in communication with an output end of the optoelectronic data converter. The application further provides a communication method for deep sea. The buoy provided by the application can conveniently and reliably transmit data of the deep sea device to a shore-based device.

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.

The present application relates to low-altitude communication technical field, provide a kind of multi-slot access optimization method, device, equipment, storage medium and program product, the method includes: the gain parameter of each user terminal to be accessed communication satellite under each time slot is acquired and optimization target is constructed;The optimization target includes the concealment target corresponding to the total power peak of single time slot under detection and the reliability target corresponding to the minimum value of signal and interference noise ratio under single time slot;By minimizing concealment target, while maximizing reliability target, construct objective function and solve, according to the time slot selection strategy and transmission power allocation strategy corresponding to the optimal solution of solving, the uplink access signal of user terminal is optimized.The concealment and reliability of multi-slot access are globally optimized by double target, optimal balance between access concealment and reliability is realized, and power balance between different time slots, ensure the concealment and reliable access of multi-slot, improve the security of low-altitude communication.

The invention provides an automatic protection method for a lift truck for general assembly of a large communication satellite, which comprises the following steps: a plurality of sensors are arranged on an operation platform of the lift truck, the plurality of sensors are positioned in the + X direction, the + / -Y direction and the-Z direction of the operation platform, and each sensor comprises a plurality of paths which can be independently arranged; the sensor is an ultrasonic sensor, the horizontal detection angle of the sensor is 120-140 degrees, and the vertical detection angle of the sensor is 10-20 degrees; configuring a response threshold value for the sensor, and controlling the moving state of the operation platform based on the response threshold value so as to prevent the operation platform from touching the large communication satellite; the response threshold comprises a first threshold and a second threshold, and when the distance between the operation platform and the large communication satellite reaches the first threshold, the operation platform is controlled to decelerate; when the distance between the operation platform and the large communication satellite reaches a second threshold value, the operation platform is controlled to stop moving. By arranging a plurality of sensors and parameters thereof, the touch with the large communication satellite during final assembly can be automatically prevented, and the large communication satellite is prevented from being damaged.

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]