243 results about "Communications satellite" patented technology

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 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 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 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.

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.

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.

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 discloses a positioning method and system for realizing global navigation by using an iHCO communication satellite, and relates to the technical field of navigation positioning, the system comprises an orbit injection monitoring end, a whole course tracking end and a difference adjusting end, the orbit injection monitoring end is used for monitoring orbit injection information of a satellite in real time, and the whole course tracking end is used for tracking the whole course; the whole-course tracking end is used for tracking the real-time state of an orbit satellite in the life period in real time, carrying out position deviation calculation in advance before positioning arrival and measuring and calculating the safe adjustment distance before navigation positioning is carried out position adjustment in real time, and the difference adjustment end is used for monitoring the real-time state of a communication satellite in real time so as to adjust the safety adjustment distance. And the orbit and the satellite attitude are corrected in time. According to the method and the system for realizing global navigation and positioning by using the iHCO communication satellite, the stability of navigation and positioning is improved, the accuracy of realizing global navigation and positioning by using the iHCO communication satellite is improved, the whole-course uninterrupted tracking and positioning are realized, the positioning deviation of navigation prediction is reduced, and the positioning information of navigation is accurately predicted in advance.

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.

The invention provides a small GEO communication satellite configuration. The small GEO communication satellite configuration comprises a satellite main body structure, a solar cell array, an antenna unit and a satellite-rocket separation mechanism, the satellite main body structure comprises structural components, the structural components are assembled into a trapezoidal hexahedral box-type star body, side plates are arranged in the X direction, the Y direction and the Z direction in a three-dimensional coordinate system OXYZ with the geometric center of the structural components as the original point O, the side plates comprise a + Z side plate, a-Z side plate, a + Y side plate, a-Y side plate, a + X side plate, a-X side plate and an OX side plate, and the + Z side plate, the-Z side plate, the + Y side plate, the-Y side plate, the + X side plate, the-X side plate and the OX side plate are arranged in the X direction, the Y direction and the Z direction respectively. The + Z side plate, the-Z side plate, the + Y side plate, the-Y side plate, the + X side plate and the-X side plate are connected to form a trapezoidal hexahedral box-type star, the OX side plate is mounted between the + Y side plate and the-Y side plate and abuts against the-Z side plate, and the OX side plate is located at the center line of the + Y side plate, the-Y side plate and the-Z side plate. The design of a traditional bearing cylinder is removed, the flexibility of the internal space of the satellite is improved, and the space utilization efficiency is improved.

The invention relates to the technical field of spaceflight, and discloses a message transmission method, device and system in the launching process, and the system comprises a target command node, a target launching platform and a communication satellite. The target command node is used for acquiring target transmitting information; generating a first instruction message based on the target emission information; sending a first instruction message to a communication satellite; receiving an execution result sent by the communication satellite; the target transmitting platform is used for receiving a first instruction message sent by the communication satellite; based on the first instruction message, executing control logic corresponding to the first instruction message to obtain an execution result; sending an execution result to a communication satellite; the communication satellite is used for receiving a first instruction message sent by the target command node or an execution result sent by the target launching platform; and based on the first instruction message and a preset mapping relationship, sending the first instruction message to a target transmitting platform whose identification address is the first address. According to the invention, the message transmission efficiency in the transmitting process can be improved.

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.

The present invention discloses a method for suppressing the space-time ripple effect of a sky-ground integrated network, comprising the following steps: S1. Given a communication satellite, M A drone, N The paper proposes an integrated sky-ground network with 30 ground base stations: S2. Access points at each layer communicate using a shared spectrum and a unified frame structure, partitioning the spectrum and assigning constraints to channel allocation. S3. The spatiotemporal ripple effect is modeled by combining spatial and temporal interference to characterize and suppress the spatiotemporal ripple effect. This paper analyzes the spatiotemporal interference in the integrated sky-ground network, models it, and defines it as a ripple effect, characterizing the interference relationships and suppression conditions between different access points.

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.