54 results about "Satellite broadcasting" patented technology

The invention discloses a satellite collision avoidance system and method based on a satellite edge computing network. The system comprises a space monitoring network, a space traffic management subsystem and the satellite edge computing network. The space monitoring network is used for observing the running state of a space target to obtain multi-source observation data; the space traffic management subsystem is used for integrating the multi-source observation data to generate space target orbit data; the satellite edge computing network further comprises the steps that a GEO satellite broadcasts space target orbit data to an LEO satellite constellation and forwards collision risk screening information to a ground cloud computing center; the LEO satellite constellation calculates collision risk screening information according to the space target orbit data and formulates a collision avoidance control strategy; the LEO / GEO earth station is used for data transceiving and protocol conversion among the GEO satellite, the LEO satellite constellation and the cloud computing center; and the ground cloud computing center stores constellation orbit data through protocol conversion and satellite communication. According to the invention, the real-time performance of satellite collision avoidance is improved.

The invention provides a precise point positioning method and system based on broadcast ephemeris satellite clock speed forecast, and the method comprises the steps: collecting broadcast ephemeris clock speed data, and filtering the broadcast ephemeris clock speed data through a dynamic sliding window; preprocessing the filtered broadcast ephemeris clock speed data, and removing abnormal state data to obtain preprocessed broadcast ephemeris clock speed data; fitting the preprocessed broadcast ephemeris clock speed data by adopting a linear period combination model and utilizing a least square method to obtain a fitted clock speed model of each satellite, and obtaining a satellite clock speed predicted value based on the fitted clock speed model; according to the satellite clock speed predicted value, user information and satellite information are combined, user equivalent distance measurement errors of a satellite orbit and clock error jump when broadcast ephemeris of each satellite is updated are calculated, the user equivalent distance measurement errors are applied to precise single-point positioning data for calculation and adjustment, and a corrected precise single-point positioning result is obtained.

The invention discloses an integrated navigation optimization method and a computer system, and the method comprises the steps: GNSS telegraph text extraction: obtaining an MSM observation telegraph text and a BRDC ephemeris telegraph text; gNSS telegraph text decoding is carried out to obtain a multi-system GNSS observation value and a multi-system satellite broadcast ephemeris parameter; constructing a GNSS pseudo-range observation equation: calculating a satellite position, and correcting a system error to obtain a linearized error equation; estimating a position parameter and a variance-covariance matrix thereof, and extracting satellite ranging precision from the broadcast ephemeris; the standard deviation of the position parameters is extracted, a distance measurement precision projection matrix is calculated, and the GNSS protection level is calculated; and setting an alarm threshold along the course, and when the protection level is smaller than the alarm threshold, incorporating a GNSS resolving result into the integrated navigation system to correct the accumulated drift of the INS system. The method has the advantages that an overall better integrated navigation output result is obtained, and the overall precision of the integrated navigation system in a complex environment is optimized.

The invention relates to an uplink and downlink time-frequency offset joint estimation compensation method, which comprises the following steps of: receiving ephemeris broadcasted by a satellite, and acquiring self position information; extrapolating the satellite position and speed at the downlink signal receiving moment according to the ephemeris, and calculating downlink frequency offset caused by satellite motion by combining the own position information; estimating downlink residual frequency offset and downlink sampling offset brought by the crystal oscillator according to the reference signal; calculating a frequency offset compensation value for the downlink signal according to the downlink frequency offset brought by the satellite motion and the downlink residual frequency offset brought by the crystal oscillator; and adjusting a received time domain signal by using the frequency offset compensation value of the downlink signal, and adjusting a received frequency domain signal by using the downlink sampling offset. According to the invention, the pre-compensation precision of the uplink frequency offset can be improved, and the estimation compensation of the downlink frequency offset and the sampling offset can be realized with lower complexity.

The invention provides a low earth orbit satellite broadcast ephemeris parameter robust determination method and system. Relates to the technical field of satellite navigation. The method comprises the following steps: performing complex collinearity analysis on a designed broadcast ephemeris model in to-be-fitted satellite precise ephemeris data to determine whether a complex collinearity relationship exists or not; when the complex collinear relation exists, determining a generalized ridge estimation step length diagonal matrix priori value according to satellite precision ephemeris data and designed broadcast ephemeris parameters; according to a generalized ridge estimation step length diagonal matrix priori value, setting a search interval and successively carrying out generalized ridge estimation to fit broadcast ephemeris parameters, calculating a fitting residual error, obtaining a generalized ridge parameter value corresponding to an optimal residual error after searching in the search interval, and according to the generalized ridge parameter value, carrying out generalized ridge estimation to fit broadcast ephemeris parameters. According to the method and the device, the problem of fitting failure caused by serious illness of the least square equation due to improper design of the broadcast ephemeris model is solved.

The invention relates to a remote sensing satellite broadcast data processing method and system, and belongs to the technical field of satellite remote sensing data processing, and the method comprises the steps: S1, receiving remote sensing satellite broadcast data, and verifying and storing a data packet; s2, the data packet is analyzed, a remote sensing image is generated, and the remote sensing image comprises a single slice or an area image formed by splicing a plurality of sub-images; s3, generating a unique orbit number for each orbit remote sensing image; s4, when packet loss occurs in the data transmission process, automatically identifying lost data blocks, and blackening lost parts in the remote sensing image; and S5, distributing the processed remote sensing image and related data to a target user. According to the method, intelligent packet loss processing and a unique track number generation mechanism are introduced into a data processing flow, so that the integrity of the remote sensing image and the convenience of data management are remarkably improved.

This invention relates to a method and system for broadcasting PPP-RTK corrections. The method includes acquiring grid point information; determining correction information according to a dynamic partitioning method based on the satellite's orbital direction, satellite signal coverage area, and the grid point information; the correction information includes a header file, the grid point information, tropospheric corrections, and oblique ionospheric corrections; and uploading the correction information to an uplink station to control satellite broadcasting of the correction information. This invention solves the problems of satellite bandwidth allocation, correction area division, and correction data format encoding for PPP-RTK atmospheric delay corrections broadcast in low-Earth orbit satellite broadcasting areas.

The application discloses a satellite broadcast simulation method, device and equipment and a readable storage medium, and relates to the technical field of satellite communication. The satellite broadcast simulation method comprises the following steps: acquiring navigation message data and enhanced message data; framing the navigation message data and the enhanced message data respectively to obtain navigation signal frames and enhanced signal frames; and modulating the navigation signal frames and the enhanced signal frames simultaneously in response to a timing control signal, and transmitting the modulated navigation signal frames and enhanced signal frames. The application simulates the process of broadcasting navigation signals and enhanced signals by real low-orbit satellites, thereby improving the authenticity of the test environment for the receiving terminal of the low-orbit satellite communication system, and simultaneously modulating based on the timing control signal, thereby avoiding the delay error in the early receiving and framing process and reducing the probability of timing error.

The invention relates to the technical field of satellite communication, in particular to a low-orbit satellite beam self-adaptive acquisition method based on fused double architectures, which comprises the following steps: realizing local clock calibration by locking a high-orbit satellite broadcast channel and acquiring a target low-orbit satellite almanac; a terminal pose and an array surface temperature gradient are acquired in real time by using an inertial measurement unit and a temperature sensor network, and a multi-dimensional physical characteristic tensor is constructed. Then, inputting the feature tensor into a nonlinear compensation model integrating multi-scale cavity convolution and a spatial self-attention mechanism, and reasoning and outputting a phase pre-distortion matrix; and by executing channel-level Hadamard product operation of the pre-distortion matrix and the theoretical pointing matrix, generating a wave control driving matrix and synthesizing a physical receiving wave beam. After a downlink signal is captured, a real Doppler frequency shift residual error is extracted, an error autocorrelation matrix is constructed, and an almanac compensation weight is reversely corrected. According to the invention, through multi-dimensional feature perception and algorithm logic closed loop, robust beam capture is realized.

This invention discloses a method, system, and apparatus for constructing low-correlation pilot sequences for satellite internet. The method includes: pilot detection using a zero-correlation domain shifted superposition pilot sequence set, and channel estimation; decoding using the SCJD algorithm to recover the remaining k-rb bits corresponding to no more than T conflicting terminals in each frame, and recovering the first rb bits of each UE using the pilot sequence obtained from pilot detection; and the satellite broadcasting a decoding status feedback message to all active users. This invention reduces the probability of pilot collisions, thereby achieving a lower access failure probability. Furthermore, this invention improves communication spectrum efficiency through the design of a data transmission protocol.

Embodiments of the present invention relate to a method, computing device, and medium for solar outage prediction and avoidance. The solar outage prediction method includes obtaining the sun's position vector based on satellite broadcasts from the local satellite; obtaining multiple transformation matrices based on the satellite's position, velocity, attitude, and laser payload installation location information, including at least: a first transformation matrix from the inertial frame to the center-of-mass orbital coordinate system, a second transformation matrix from the center-of-mass orbital coordinate system to the satellite's coordinate system, and a third transformation matrix from the satellite's coordinate system to the laser payload's coordinate system, wherein the third transformation matrix is ​​calculated at least based on the laser payload's installation orientation and installation error angle along the three axes of the satellite; and calculating the field-of-view angle between the sun's position vector and the laser payload's line of sight from the local satellite based on the multiple transformation matrices; to determine whether the local satellite has entered the solar outage region. This improves the accuracy of solar outage prediction and enhances the efficiency of inter-satellite communication link recovery after a solar outage.

The application relates to a self-adaptive split federated learning method in an air-ground integrated network, comprising the following steps: a hierarchical training network environment is constructed, and a hierarchical agent and related parameters are initialized; at the beginning of each long cycle, a long cycle agent determines a model split action of each device, and splits a global model into a device end submodel and a server end submodel; model parameters and split instructions are distributed through high-orbit satellite broadcasting, and each device loads a corresponding submodel with a ground station; in each short cycle, a short cycle agent generates a resource scheduling decision, realizes multi-device parallel split training, and updates the short cycle agent; at the end of the long cycle, a new global model is generated through weighted aggregation and the long cycle agent is updated through a high-orbit satellite. By adopting the technical scheme, the conflict between limited device computing power and large model training can be solved, training delay can be reduced, transmission reliability can be improved, and self-adaptive optimization of a training strategy and system scalability in a dynamic network can be realized.

Embodiments of the application disclose a paging method and related device, storage medium and computer program product. A first network element is co-located with a satellite gateway station. The paging method applied to the first network element comprises: receiving system messages broadcast by each satellite of N satellites; wherein N is a positive integer, and the N satellites are over-the-top satellites connected with the satellite gateway station; for each satellite of the N satellites, a corresponding set of satellite ephemeris parameters is parsed from the respective system message, and N sets of satellite ephemeris parameters are obtained; in response to a reporting instruction sent by a first core network, M sets of satellite ephemeris parameters currently effective in the N sets of satellite ephemeris parameters are reported to the first core network, so that the first core network determines a first satellite providing services for a non-terrestrial network (NTN) terminal from M satellites corresponding to the M sets of satellite ephemeris parameters, and pages the NTN terminal; wherein M is a positive integer, the first core network is a core network to which the NTN terminal belongs, and the NTN terminal is a call object of a ground cellular terminal.

The invention provides a satellite positioning method and device, computer equipment and a storage medium, and the method comprises the steps: obtaining satellite broadcast data received by a receiver in a current epoch, the satellite broadcast data comprising broadcast data of a plurality of satellites, and the broadcast data comprising a pseudo range and a carrier phase; performing linearization processing on the first observation expression corresponding to the pseudo-range and the second observation expression corresponding to the carrier phase to generate a target observation expression used for determining the positioning information; determining an error model of various state parameters in the target observation expression, wherein the various state parameters comprise three-dimensional coordinates, receiver clock error, ionospheric delay and carrier phase ambiguity; determining initialization information of at least one state parameter in the target observation expression according to the satellite broadcast data, and initializing the target observation expression by using the initialization information; and determining a positioning result of the receiver in the current epoch based on the error model, the initialized target observation expression and an extended Kalman filtering algorithm.

The present invention belongs to the technical field of low-orbit satellite communication, and discloses a satellite system for jointly improving the application efficiency of TT&C (Telemetry, Tracking and Command) and data transmission and communication. Its control unit is responsible for calculating the ephemeris and satellite attitude for satellite broadcasting, parsing the satellite working mode switching instruction according to the ground station information stored in the storage unit, and then sending the instruction to each module unit; both baseband processing units support on-orbit reconfiguration and loading, wherein baseband processing unit A is used to complete TT&C signal processing or user wide-beam access signal processing; baseband processing unit B is used to complete communication service signal processing or data transmission signal processing; two up-conversion units respectively perform up-conversion processing on the service link signal and the TT&C link signal in the signal processing module, and two down-conversion units respectively receive the signals from the phased array transceiver antenna and the wide-beam transceiver antenna, and complete down-conversion processing. The TT&C link can support the satellite TT&C function and the communication wide-beam access function in a time-sharing manner.

The present invention provides a precise point positioning method and system based on broadcast ephemeris satellite clock speed prediction, comprising the following steps: collecting broadcast ephemeris clock speed data, filtering the broadcast ephemeris clock speed data using a dynamic sliding window; preprocessing the filtered broadcast ephemeris clock speed data, eliminating abnormal state data, and obtaining preprocessed broadcast ephemeris clock speed data; adopting a linear periodic combination model, fitting the preprocessed broadcast ephemeris clock speed data using a least squares method, obtaining a fitted clock speed model for each satellite, and obtaining a satellite clock speed prediction value based on the fitted clock speed model; calculating, based on the satellite clock speed prediction value and in combination with user information and satellite information, a user equivalent ranging error of a satellite orbit and clock difference jump when the broadcast ephemeris of each satellite is updated; applying the user equivalent ranging error to precise point positioning data for solution and adjustment, and obtaining a corrected precise point positioning result.

The embodiment of the invention provides a synchronization method and device for an inbound reference time mark of an RDSS receiver, the receiver and a storage medium. The method comprises the following steps: determining a timing interruption time difference by acquiring tracking channel observed quantity data, correcting a timing interruption triggering moment to be aligned with an outbound reference time mark, acquiring an outbound frame number in satellite broadcast, and maintaining outbound frame time count and an inbound reference time mark in each timing interruption; therefore, the inbound response time can be accurately determined, the transmitting module is controlled to transmit the inbound signal on time, and the technical problem that the inbound response transmitting time sequence is inaccurate due to the fact that timing interruption and outbound reference time marks are difficult to align and intra-frame time maintenance is easy to drift in existing counting is solved.

Systems and methods for interaction of satellite and Internet protocol features in content delivery systems are presented. Using such systems and methods, the delivery of some content to the same product by Satellite delivery, other content by IP de-livery, and still other content by both Satellite and IP delivery can enhance the utility of both the content and the product for an end user and can further optimize the costs and quality of service associated with delivering the content. A method of providing content and data to a combined satellite and IP network receiver is presented, including broadcasting via satellite content and data to the re-ceiver, and sending via an IP based communications network content and data to the receiver, where the content and data provided over the Satellite broadcast enables capabilities of the receiver needed to consume content received by IP delivery, and the content and data provided via IP delivery enables capabilities of the receiver needed to consume content received from the satellite broadcast.

The present specification relates to the technical field of satellite internet, and particularly relates to a low-orbit satellite communication system positioning method and a terminal. The method comprises the following steps: a user terminal receives satellite broadcast to obtain ephemeris information at a current time and position information of a wave position center point, and performs initial time delay estimation and initial frequency offset estimation; then the user terminal performs time-frequency pre-compensation processing on a PRACH signal according to the initial time delay and frequency offset estimation, and sends the PRACH signal to a satellite; after the satellite captures the PRACH signal, the user terminal corresponding to the PRACH signal is positioned according to residual time delay and residual frequency offset carried in the PRACH signal and the position of the wave position center point. Thus, the positioning of the satellite side for the GNSS terminal is realized without relying on GNSS information.

The invention discloses an AEB control method based on cooperation of a low-orbit satellite and the Internet of Vehicles, and relates to the technical field of intelligent traffic and vehicle safety control, and the method comprises the steps: enabling an intelligent vehicle to collect the state data of the vehicle and the information of surrounding vehicles through a low-orbit satellite communication module, and uploading the data to the low-orbit satellite; the low-orbit satellites group and summarize vehicle data in a similar geographic area, construct a dynamic map of vehicles in the area, screen vehicle clusters needing information intercommunication, generate scheduling information and issue the scheduling information to the vehicles, and the edge calculation unit sends a brake triggering instruction to the AEB control unit when judging that the risk reaches a preset safety threshold. According to the AEB system, beyond-visual-range data intercommunication is achieved through the low-orbit satellites, sight shielding and distance limitation of traditional vehicle-mounted sensing are broken through, and the risk identification precision and response timeliness of the AEB system are improved.

The invention discloses a coding time slot random access method based on a rate division multiple access transmission technology, which solves the problems of low resource utilization rate and low system throughput under high load in the prior art, realizes terminal adaptive transmission, remarkably improves the system resource utilization rate, optimizes the throughput performance, and improves the system performance. A stable and reliable communication effect is kept in a high-load scene; the method comprises the following steps that: a terminal preprocesses a data packet according to an optimal strategy of satellite broadcast to form a plurality of data packet groups, and randomly selects a transmission power level and a segmentation time slot through a power hierarchical distribution mode to send the data packet groups to a satellite; and the gateway performs iterative interference elimination decoding on the received signal, analyzes the information of each terminal, calculates the estimated throughput of different transmission strategies based on the real-time load, and dynamically selects and broadcasts a new optimal strategy. And the terminal updates the transmission parameters according to the data and periodically executes the process until all the data are transmitted.

A pay television satellite broadcast includes validation data that can be used to validate authenticity of live global positioning system (GPS) data. The validation data may be included within entitlement messages and encrypted for security and selective reception by authorized receivers. A navigation system may compute checksums of received live GPS data and compare with the validation data for a match. A decision about whether or not to use the live GPS data may be taken based on whether or not the computed checksums match the validation data received via the pay television satellite broadcast signals.

The embodiment of the invention provides a satellite switching method, a communication system, terminal equipment, a satellite and a related device, and relates to the technical field of communication. The method includes a source satellite broadcasting a first signal. A terminal device receives a first signal from a source satellite. The first signal comprises beam range information of the source satellite and target satellite information. And the terminal equipment sends a first scheduling request (SR) to the target satellite. The SR is used for satellite switching. The first compensation parameter for time-frequency pre-compensation of the first SR is determined based on the first position of the terminal device and the target satellite information. The first position relates to beam range information, height, and synchronization parameters of the source satellite, irrespective of GNSS positioning and SSB of the target satellite. In a terminal equipment hard handover scene or a scene in which the terminal equipment cannot perform GNSS positioning (such as a GNSS stop scene), the success rate of satellite handover of the terminal equipment can be improved.

The application provides a target monitoring method, system and medium, wherein the method comprises: after a second satellite receives a remote sensing imaging task broadcast by a first satellite, determining whether an attitude condition corresponding to the remote sensing imaging task is met, the attitude condition being used to indicate that a position attitude of the second satellite can execute the remote sensing imaging task earliest among m satellites; when it is determined that the attitude condition is met, executing the remote sensing imaging task to obtain a remote sensing image of a target area, and performing on-orbit identification on the remote sensing image to obtain corresponding identification information; when the identification information meets a preset alarm condition, generating a corresponding early warning message and broadcasting the early warning message to the space-based system, so as to send the early warning message to a ground station in the territory for processing by a third satellite in the space-based system. In this way, technical problems in the prior art, such as the need for occupying more transmission arc segment resources for a remote sensing image, long transmission time consumption and reduced timeliness of target monitoring, can be solved.

The application provides a low-orbit satellite broadcast ephemeris parameter robust determination method and system. It relates to the field of satellite navigation technology. The method comprises: performing multiple collinearity analysis on the designed broadcast ephemeris model in the satellite precise ephemeris data to be fitted to determine whether there is a multiple collinearity relationship; when the multiple collinearity relationship exists, determining the generalized ridge estimation step diagonal matrix prior value according to the satellite precise ephemeris data and the designed broadcast ephemeris parameter; setting a search interval and fitting the broadcast ephemeris parameter by generalized ridge estimation step by step according to the generalized ridge estimation step diagonal matrix prior value, calculating the fitting residual, obtaining the generalized ridge parameter value corresponding to the optimal residual after the search in the search interval is completed, and fitting the broadcast ephemeris parameter according to the generalized ridge parameter value. The application solves the problem that the least square equation is seriously ill due to improper design of the broadcast ephemeris model, which further leads to fitting failure.

The invention relates to a digital regeneration-based static orbit satellite broadcast forwarding system, which is characterized in that a demodulation receiver receives uplink data of a ground station through a receiving antenna, completes data demodulation and transmits the data to a rear-end data processor; the data processor judges whether the uplink data needs to be fused with the real-time remote sensing data or not according to the identifier of the uplink data, and if the uplink data is the data needing to be fused, fusion processing of the uplink data and the remote sensing data is completed in the data processor; if the uplink data does not need to be fused, directly storing the uplink data into the solid-state memory; reading broadcast distribution data from the solid-state memory, and forwarding the broadcast distribution data to the broadcast modulator through the data processor; the broadcast modulator encodes and modulates broadcast downlink data into a radio frequency signal, and the radio frequency signal is broadcast and distributed to a designated area through the transmitting antenna after being subjected to filtering and power amplification. And the use efficiency of broadcast distribution of the geostationary orbit remote sensing satellite is effectively expanded.

The embodiment of the invention provides a positioning method and device based on an unmanned aerial vehicle, equipment and a storage medium. The method comprises the following steps: acquiring ephemeris information, correction information, first observation information and second observation information of a preset satellite; the ephemeris information represents ephemeris parameters of preset satellite broadcast; the correction information represents deviation data broadcasted by the preset satellite-based enhancement system and used for correcting ephemeris parameters of the preset satellite; the first observation information represents a carrier phase observation value of a preset satellite acquired by a preset base station; the second observation information represents a carrier phase observation value of a preset satellite acquired by the unmanned aerial vehicle; determining coordinate information of the preset satellite according to ephemeris information and correction information of the preset satellite; the coordinate information represents the position, collected by the unmanned aerial vehicle, of a preset satellite in a three-dimensional space; and determining the position information of the unmanned aerial vehicle according to the coordinate information of each preset satellite, the first observation information and the second observation information. The method is used for improving the positioning accuracy of the unmanned aerial vehicle.

The present disclosure provides a system (208) and a method for enabling a store and forward mechanism in delay-tolerant services of a serving satellite. The system (208) receives data from a UE (204), and detects an availability or unavailability of a feeder link between the serving satellite and an entity. Based on the detection that the feeder link is unavailable, the system (208) enables store and forward mechanism within the serving satellite to temporarily store the received data until the feeder link is restored. The system (208) updates an ASNR table of a new neighbouring satellite based on a detection that the new neighbouring satellite is available, and establish an ISL with the new neighbouring satellite. Further, the system (208) broadcasts an availability of the ISL to the neighbouring satellites, updates the ASNR table of the neighbouring satellites, and forwards the stored data to the neighbouring satellites via the ISL.

The present application provides a communication method, which can be applied to satellite communication. The method comprises: a first communication device sending a first ephemeris, wherein the first ephemeris is an ephemeris broadcast by at least one satellite and received by the first communication device; then receiving a constellation ephemeris from a second communication device, the constellation ephemeris comprising a second ephemeris of each satellite among a plurality of satellites, wherein the second ephemeris of a first satellite is determined by the second communication device on the basis of at least one first ephemeris of the first satellite; and then, selecting a satellite suitable for access, reselection, or handover on the basis of the constellation ephemeris. In the solution provided by the present application, because the constellation ephemeris comprises the second ephemerides of a large number of satellites, the accuracy of satellite selection by the second communication device can be improved.

The invention discloses a positioning enhancement method and system based on intelligent correction of Beidou ephemeris orbit data, and the method comprises the steps: receiving satellite broadcast ephemeris data, and synchronously collecting historical ephemeris error records; optimizing dynamic model parameters by using the latest acquired broadcast ephemeris data, and generating orbit calculation data; constructing a short-term orbit error prediction model of the deep learning network based on wavelet transform; supervised learning is carried out on the prediction model, and a predicted value of the track position error is output; and fusing data, and outputting a high-precision positioning solution through an error correction mechanism. The system comprises a data acquisition unit, a calculation unit, a model construction unit, an error prediction unit and a positioning correction unit. According to the invention, high-precision positioning can be provided in real time. The method can be widely applied to the field of single-point positioning.