279 results about "Communications satellite" patented technology

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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.

The invention discloses an air-space cooperative unmanned aerial vehicle emergency communication system and a communication method. The system comprises an unmanned aerial vehicle, and the unmanned aerial vehicle is provided with a solar photovoltaic panel, an energy storage device and an air-space integrated base station. The solar photovoltaic panel is used for adjusting the working point of the solar photovoltaic panel based on a predetermined adjustment strategy so as to charge the energy storage device according to the maximum output power all the time; the energy storage device is used for supplying power to the unmanned aerial vehicle and the air-space integrated base station; and the air-space integrated base station is used for receiving the communication data of the user terminal, sending the communication data to the core network deployed in the communication satellite, and receiving return data of the core network in response to the communication data. The technical problem that the flexibility of the communication coverage range is limited due to the fact that a mooring type unmanned aerial vehicle is adopted for emergency communication in the prior art is solved.

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 difference-based satellite-ground laser ranging and communication integrated method, which belongs to the technical field of optical measurement, and is characterized in that laser communication and differential laser ranging are carried out by using an integrated light source according to a satellite differential laser ranging principle of continuous laser, so that the satellite laser ranging and the laser communication share one laser light source; the functions of laser ranging and laser communication are completed, and integration of a light source is achieved. In order to realize a high-precision satellite-ground laser ranging technology, the precision of a communication satellite orbit algorithm is improved, a laser communication system can realize a data transmission rate higher than that of traditional radio communication, and the requirements of real-time transmission of high-resolution images or scientific data can be met.

The invention discloses a GNSS positioning system and positioning method based on a low-orbit satellite, and relates to the field of satellite navigation, and the positioning system comprises a main user side which is used for sending a positioning request and can achieve the communication with the low-orbit satellite and a GNSS navigation satellite; the satellite measurement and control module is used for realizing communication with a low-orbit satellite; the GNSS enhanced positioning module is used for providing a GNSS enhanced product, the communication auxiliary module is used for realizing communication with the GNSS enhanced positioning module and a low-orbit satellite and is in communication connection with the main user side, and the main user side is used for receiving and processing data from the low-orbit satellite, receiving and processing data from a GNSS navigation satellite and realizing positioning according to the GNSS enhanced product. The broadcast data volume of the low-orbit satellite can be reduced, and the communication cost can be saved.

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.