1134 results about "Constellation" patented technology

To provide a modulation / demodulation method that can avoid overshoot that occurs during a signal point transition process on a constellation even when the Y-00 encryption communication method is applied to a modulation method used in wireless communication, and a wireless communication device using the method.SOLUTION: A modulation method using the Y-00 encryption communication method by phase modulation of information for wireless communication, includes determining a reference position in a constellation of a previous signal point indicating previously transmitted data, making a certain range determined by the reference position a prohibited area so that a transition path of the signal point avoids passing near the origin on the constellation, determining a relative position of the current signal point from the reference position based on a current running key and currently transmitted data within a range excluding the prohibited area, determining I / Q coordinates on the constellation from the current signal point to generate modulated data, and performing multi-value phase modulation.SELECTED DRAWING: Figure 11

The invention discloses an improved satellite navigation authorization signal real-time estimation device, which comprises a public signal tracking module used for tracking a public pseudo code of a satellite navigation signal in real time and outputting the public pseudo code of the satellite signal, a navigation message, baseband data after carrier stripping and a chip synchronization signal; the authorization signal purification module is used for estimating a pseudo code of the authorization signal in real time; and the public signal tracking module is connected with the authorization signal purification module. According to the method, the navigation message and the public pseudo code information of each code period are demodulated firstly, and then pseudo code estimation of M baseband constellations is improved into pseudo code estimation of M / 2 baseband constellations under the assistance of the navigation message and the public pseudo code, so that the bit error rate of authorized pseudo code estimation is reduced, and the accuracy of pseudo code estimation is improved. And the high gain requirement of the satellite navigation authorization signal estimation device on the receiving antenna is reduced.

The invention provides a satellite group task planning method and system based on a fine tuning large language model, and relates to the technical field of satellite group task planning. The task planning method comprises the following steps: processing a task planning request through a constraint analysis-tagging large language model to obtain a structured sample containing question definition, a reasoning process and a final answer; processing the structured sample through a pre-trained large language model oriented to satellite task planning domain knowledge alignment to obtain a preliminary satellite task planning scheme; and finally, carrying out iterative optimization on the preliminary satellite task planning scheme by utilizing a heuristic dynamic tuning framework to obtain a large-scale satellite group task planning scheme. According to the method, the problem of large-scale satellite group task planning is solved by utilizing the logical reasoning ability of a large language model, satellite task planning domain knowledge fine tuning is performed through satellite task planning fine tuning data based on a thinking chain, and a large-scale satellite group task planning scheme is efficiently generated with high quality in combination with a heuristic dynamic tuning framework.

The invention relates to the field of satellite operation, and discloses an in-orbit collision avoidance method and device for a constellation system, and the method comprises the steps: enabling a ground system to obtain the ephemeris information of a constellation satellite and space debris; the ground system evaluates the first collision risk of the satellite in the first period time in the future according to the ephemeris information of the constellation satellite and the space debris; when the first collision risk is greater than a first threshold value, the ground system uploads ephemeris information of the space debris to a satellite; the satellite updates a second collision risk in a second period time in the future in real time based on the received space debris ephemeris information and the satellite positioning information; when the second collision risk is greater than a second threshold value, the satellite formulates a corresponding collision avoidance strategy, and orbital maneuver is carried out according to the collision avoidance strategy; and after the avoidance is completed, the satellite actively maneuvers and returns to a nominal position corresponding to satellite ephemeris information, and the connection with the ground system is recovered. According to the invention, the accuracy of collision risk assessment is improved, and the implementability is improved.

The invention discloses a low-orbit communication constellation distributed beam allocation method and system. The method comprises the following steps: S1, distributed satellite group task distribution; a planning task is forwarded through a distributed centerless satellite group architecture, and broadcasting of the task in a satellite group is realized by dynamically determining an on-duty satellite; s2, target area wave position division based on a sine space; after a single satellite receives a task, according to the geographic position coordinates of the satellite and the ground terminal, the beam position number of the ground terminal is obtained through calculation; s3, single-satellite beam resource allocation based on a hopping beam; time is divided into time slots based on a beam hopping mode, and distributed low-orbit communication constellation beam allocation is realized through a resource allocation algorithm. According to the method and the system, the robustness of the system can be improved, the calculation amount is reduced and the calculation speed is improved.

The invention discloses a satellite-based enhancement information generation method and system based on a low-orbit constellation, and relates to a satellite navigation enhancement technology, and the method comprises the steps: decoding and processing Beidou PPP-B2b message information, so as to obtain a Beidou satellite high-precision orbit and a clock error; smoothing the pseudo-range observation value by using the low-orbit satellite carrier phase observation value; constructing an ionosphere-free combined observation value by using the observation data of the low-orbit satellite, and resolving the real-time position of the low-orbit satellite based on the obtained high-precision orbit and clock correction of the Beidou satellite to obtain the position information and clock correction information of the low-orbit satellite; performing satellite-based enhanced differential correction calculation by using the obtained low-orbit satellite position information, low-orbit satellite observation data and GNSS basic navigation messages to obtain a satellite-based enhanced orbit and clock differential correction; and carrying out pseudo-range residual error correction according to the obtained satellite-based enhancement difference correction number, and carrying out satellite-based enhancement integrity parameter calculation based on a correction result. According to the method, the position of the low-orbit satellite can be determined synchronously without depending on an external high-precision GNSS satellite orbit and clock error data, and the state of the low-orbit satellite is monitored.

The invention discloses a low-orbit communication constellation target area coverage evaluation method and system. The method comprises the following steps: S1, dividing a low-orbit communication constellation target area into quadrilateral grids based on longitude and latitude lines; s2, calculating a single-satellite-to-single-point target coverage time sequence under the condition of considering the earth curvature; s3, counting the coverage time of the constellation to the target area by counting the coverage time of the single satellite to the target; and S4, comprehensively evaluating the coverage performance of the communication constellation on the target area through the coverage index. According to the method and the system, the coverage index of the constellation to the target area can be quickly calculated, the precision of constellation coverage evaluation is improved, the calculation is simple, and the real-time performance is high.

The deep joint source channel coding method comprises the following steps: a sending end obtains a first semantic feature of a first image, and performs constellation mapping modulation on the first semantic feature to obtain a first initial constellation point; the sending end extracts semantic information of the first initial constellation point, generates a rotation angle corresponding to the semantic information, and rotates the first initial constellation point according to the rotation angle to obtain a first rotation constellation point; the sending end generates a real part interleaving matrix and an imaginary part interleaving matrix based on the first rotating constellation point and the real part and the imaginary part of the channel state information, resorts the real part and the imaginary part of the symbol sequence respectively and then recombines the real part and the imaginary part into a complex signal to obtain a first interleaving signal; the sending end transmits the first interleaved signal to a receiving end through a fading channel, and the receiving end receives a second interleaved signal; the receiving end performs semantic reconstruction decoding on the second interleaved signal to obtain a second image; or, the receiving end performs semantic classification decoding on the second interlaced signal to obtain a second image category.

A user device, a method, and a computer program product enable conditional requests by a user device based on predicting a radio link failure due to a terrestrial object. A communication subsystem of the user device receives communication service by a currently serving satellite of a constellation of satellites in low earth orbit (LEO). The serving satellite has a field of view encompassing a target area surrounding the user device. A controller of the communication device determines a location of the user device and tracks trajectories and corresponding fields of view of the constellation of LEO communication satellites. In response to predicting a radio link failure due to a terrestrial obstruction, the controller triggers completion of a conditional handover of radio link to a target satellite that is not predicted to have a radio link failure due to a terrestrial obstruction.

The invention discloses a low-orbit super-dense constellation optimization method based on an NSGA-II algorithm, and belongs to the field of satellite communication. According to the method, the problems that in the scene of low-orbit super-dense constellation configuration optimization, an existing optimization method is high in time complexity, the constellation coverage performance cannot be guaranteed, and the inter-satellite link richness requirement cannot be met are solved. The method comprises the following steps: firstly, simulating a constellation, and establishing a target function according to a constellation optimization target; establishing a multi-objective optimization model by taking parameters of the constellation as input and taking the established objective function value as output; then, an NSGA-II algorithm is adopted to solve the established multi-objective optimization model, and a pareto leading edge point set and an optimal solution set are obtained; and finally, K pareto front edge points are selected from the obtained pareto front edge point set, and low-orbit super-dense constellation design is carried out based on constellation parameters corresponding to the selected pareto front edge points in the optimal solution set. The method can be applied to low-orbit super-dense constellation optimization.

Satellite optimization management systems based on natural language input and artificial intelligence methods are provided. Conventional satellite management systems require understanding how to control and program satellites. As the number of satellites are deployed, the need to control such satellites by natural language instruction increases. The systems and methods disclosed herein include a natural language processing module configured to receive and interpret user input expressed in natural language to determine a user's intent and map it to specific tasks. In order to correctly determine a user's intent, a neural network with artificial intelligence models may be used. Such user's intent may be used to generate and execute satellite command sequences based on operational tasks derived from the user's natural language inputs. Such natural language input and derived intents can be translated into command sequences to that are applicable across an entire constellation of a large number of satellites.

The invention provides a large-scale constellation earth observation task planning method and device, and belongs to the technical field of satellite task planning. According to the embodiment of the invention, a large-scale constellation earth observation task problem is divided into a multi-satellite-cluster cluster allocation problem and a single-satellite-cluster cluster autonomous task planning problem, and the improved adaptive large neighborhood search algorithm fused with tabu search is adopted to allocate the large-scale constellation earth observation tasks to different satellite clusters. And then, multi-satellite task planning in a satellite cluster is realized by adopting a satellite cluster autonomous task planning algorithm based on an extended contract network mechanism. Therefore, the dimension reduction of the problem scale can be realized, the search space can be greatly reduced, the solving efficiency can be improved, the cooperative capability between satellites in the satellite cluster can be improved, and especially in the scene of satellite damage and interference, the anti-interference capability and cooperative completion efficiency of the task can be improved, and the robustness and reliability of task planning can be ensured.

Provided are a data modulation method and apparatus, a device, and a storage medium. The method includes: a modulation manner is configured, and data is modulated by using the modulation manner. That the constellation point modulation symbol of the modulation manner is formed by combining the first group of constellation point modulation symbols and the second group of constellation point modulation symbols includes: adjusting a phase of the second group of constellation point modulation symbols based on a phase of the first group of constellation point modulation symbols; and forming, based on a combination of the first group of and adjusted second group of constellation point modulation symbols, the constellation point modulation symbol of the modulation manner.

The invention discloses a low-to-low multi-satellite observation task planning and designing method, and the method comprises the following specific steps: 1) determining target constellation orbit deployment related parameters in a low-to-low multi-satellite observation task system, the target constellation orbit deployment related parameters specifically comprising a target constellation orbit height H < Tar >, a target constellation orbit inclination angle i < Tar >, a target constellation orbit height i < Tar >, a target constellation orbit inclination angle i < Tar > and a target constellation orbit inclination angle i < Tar >; the target constellation orbital plane number PTar and the target constellation same orbital plane satellite number NSar are calculated; 2) determining the orbit height of the monitoring satellite by referring to the target constellation orbit height distribution characteristics; 3) determining the number of orbital planes needing to be deployed by the monitoring satellite system and the number of monitoring satellites on each plane by combining target constellation orbit deployment related parameters and task time requirements; 4) analyzing task requirements according to given specific tasks, and proposing a task planning strategy of a single satellite to multiple satellites; and 5) completing multi-target simulation analysis of multiple satellites, and giving a low-to-low multi-satellite observation task result. According to the method, two technologies of maneuvering orbital transfer and natural intersection are combined, the problem of narrow imaging window of a single-to-single target different-plane grazing autonomous task planning algorithm in actual engineering use is successfully solved, and low-consumption and high-efficiency multi-target observation is finally realized.

The invention provides a multi-satellite parallel data transmission resource scheduling method based on a genetic algorithm, and belongs to the technical field of ground task management and control of spaceflight earth observation satellites. The method comprises the steps that historical data transmission resource use rules of all satellites are mined, and data transmission resource use rule models of all the satellites are established; in a data transmission resource scheduling process, each satellite generates a corresponding resource demand set according to a data transmission timeliness requirement, a priority degree and a data transmission resource use rule model of an important task, conflict resolution is carried out on a conflicting resource use demand set by utilizing a genetic algorithm, and a data transmission resource scheduling result is obtained through a multi-round parallel resource matching and conflict resolution process. The multi-satellite data transmission resource planning scheme is obtained, large-scale satellite data transmission resource scheduling is achieved, the large-scale remote sensing satellite group resource use efficiency is effectively improved, and the implementation rate of reconnaissance tasks is improved. According to the method, the data transmission resource distribution income among multiple satellites can be comprehensively planned, and the intelligent scheduling capability level of large-scale remote sensing satellite group resources can be effectively improved.

The invention provides a giant satellite base measurement and control data transmission task planning method and device, electronic equipment and a medium, and relates to the technical field of multi-satellite task planning. A measurement and control data transmission integrated task scheduling strategy for a super-large-scale constellation aims at fully combining complex constraints of measurement and control and data transmission tasks in a giant satellite base; ground station resources are efficiently and reasonably allocated for the giant satellite base and a task execution scheme is optimized through the powerful learning and decision-making capability of a deep reinforcement learning algorithm, so that the execution effects of two task types are considered, the task satisfaction rate of the system is remarkably improved, and the utilization rate of time resources is improved; in conclusion, through multi-dimensional resource collaborative optimization and dynamic task planning, the bottlenecks of a traditional scheduling strategy in the aspects of task capacity, response timeliness and the like are broken through, and therefore the high-reliability in-orbit operation and mass data transmission capacity of a constellation system are ensured.

The invention discloses a low-orbit large-scale remote sensing constellation task scheduling method for ground multi-attention target continuous observation application, which comprises the steps of S1, task allocation model construction: establishing a ground multi-attention target continuous observation task allocation model of a low-orbit large-scale remote sensing satellite constellation, the task distribution model describes the distribution process of observation tasks, stipulates conditions and target functions met by the optimal observation scheme, and comprehensively considers the maximum observation gap window constraint and various strong constraints, so that the overall task benefit value of the optimal observation scheme is maximum; and S2, solving the task allocation model: solving the task allocation model by using a solving algorithm formed by adding constraint check and a correction operator on the basis of a genetic algorithm to obtain an optimal observation scheme. The method has the advantages that the maximum observation gap is used as an index for measuring the continuity of the observation task according to the demand characteristics of the continuous observation task, the method has the advantage of considering both the observation time and the observation continuity, and the accuracy and efficiency of task solving are improved.

The invention relates to the technical field of large-scale constellation task planning, in particular to a large-scale constellation efficient cooperative task planning method based on hierarchical reinforcement learning, which comprises the following steps: constructing a large-scale constellation task planning model; performing end-to-end collaborative planning on a multi-satellite task allocation problem and a single-satellite task scheduling problem based on hierarchical reinforcement learning, including task allocation based on Monte Carlo tree search and task scheduling based on Transform architecture; setting a task distribution model and a task scheduling model, and inputting the task information into a task distribution module to obtain a distribution result; and calculating task scheduling information of each satellite according to the distribution result, inputting the task scheduling information into a task scheduling module, and obtaining a scheduling result through the task scheduling module. According to the method, efficient planning of large-scale constellation tasks is realized, the optimization target can be coupled, the solution complexity is reduced, the global optimality of the solution is ensured, and the solution efficiency is improved.

A systema and method for atmospheric anomaly detection is disclosed. The method may include performing a time synching between a network of ground-based nodes and a plurality of satellites of a constellation. The method may include directing a transmission of signals between the network and the plurality of satellites, where the signals are configured to be aimed along a plurality of paths through an atmospheric space between the network and the satellites. The method may also include receiving and aggregating signal data corresponding to the signals via at least one of the network or the satellites, determining signal characteristics based on the signal data, identifying one or more atmospheric anomalies based on the signal characteristics, and adjusting a flight plan based on the one or more atmospheric anomalies.

The invention provides a low orbit constellation autonomous time synchronization method based on a Ka inter-satellite link, and relates to the field of satellite navigation and time frequency transmission, and the method comprises the steps: obtaining a Ka wave band standard timestamp signal of a ground station, and carrying out the taming of a satellite clock, and obtaining a constellation initial anchor node; carrying out distance measurement in two directions by using time division multiplexing, and correcting motion time delay to obtain corrected inter-satellite clock difference data; carrying out clock error data fusion, inhibiting long-term drift, and generating a constellation unified time scale; based on the constellation unified time scale, topology dynamic optimization is carried out, and an optimized network topology is obtained; kalman filtering and polynomial prediction are utilized to maintain a time reference, and an LSTM neural network is combined to predict frequency drift change, so that an autonomous time keeping result is obtained; and verifying an abnormal clock error through majority voting of adjacent nodes, and if the voting fails, isolating a fault and reversely calculating a recovery value. The method is used for overcoming the defect that fiber time frequency transmission in the prior art is limited by ground fixed facilities and cannot be applied to inter-satellite scenes.

The invention provides a low-orbit forward scattering detection method and system and a medium. Comprising the steps that a low-orbit forward scattering detection model based on Walker constellation configuration is constructed, each satellite and a receiver form a detection unit, and after an aerial target is excited by a radiation signal of a satellite group {}, if the kth detection unit meets a bistatic angle, according to the Cavalieri principle and a signal-to-noise ratio threshold condition, the kth detection unit meets the bistatic angle; determining a real effective coverage ratio meeting a geometric constraint condition and a detectable elevation threshold meeting a power constraint condition; an effective detection window is formed in the shadow cone unit based on the true effective coverage ratio and the detectable elevation threshold, and low-orbit forward scattering detection is performed. According to the method, the detection performance of the low-orbit forward scattering detection system under the conditions of different satellite numbers, different detection wavelengths and the like is analyzed, and theoretical support is provided for reliable airspace perception of the low-orbit giant constellation forward scattering detection system.

The invention provides a low-orbit navigation constellation autonomous orbit determination method and system under a weak inter-satellite topological structure, and relates to the technical field of satellite orbit determination, and the method comprises the steps: obtaining various observation data of an inter-satellite link on a predetermined orbit, and carrying out the preprocessing of the various observation data; establishing a synchronous observation equation of orbit and clock correction parameters by adopting a segmented linear polynomial satellite clock correction modeling method, generating orbit, clock correction and related error parameters combining satellite-borne GNSS and inter-satellite link data, and forecasting; based on an error analysis result, multiple key features are extracted from the generated orbit, clock error and related error parameters to serve as input of a parameter prediction model, and a parameter time sequence of four types of prediction including relative weight, inter-satellite link hardware delay, low-orbit satellite clock error and unmodeled error is obtained through output; and uploading the predicted parameter time sequence and the broadcast ephemeris to a main satellite together, and transmitting to each sub-satellite by the main satellite through an inter-satellite link to realize distributed autonomous orbit determination of the sub-satellites.

The invention discloses a real-time closed-loop satellite navigation simulation system, which relates to the technical field of satellite navigation simulation testing and comprises an outdoor navigation signal purification unit and an indoor real-time closed-loop simulation system. The outdoor navigation signal purification unit comprises a high-gain antenna and a signal processing system and is used for searching a navigation satellite in real time and extracting signal parameters; the indoor real-time closed-loop simulation system comprises a motion controller, a satellite navigation receiver and a real-time closed-loop satellite navigation simulator; the real-time closed-loop satellite navigation simulator comprises a satellite navigation signal parameter simulation unit and a satellite navigation real-time signal generation unit; the motion controller communicates with the satellite navigation signal parameter simulation unit through the optical fiber reflection memory; the satellite navigation real-time signal generation unit transmits a simulation signal to a satellite navigation receiver. According to the invention, the defect that a semi-physical simulation system in the prior art cannot support actual constellation error simulation and does not support authorization signals can be overcome.

The invention relates to a remote sensing satellite group adaptive task planning method and system based on a large language model, and the method comprises the steps: building an optimization model based on decision variables, constraint conditions and optimization targets of remote sensing satellite group task planning; generating an initial task planning strategy by adopting a greedy algorithm based on the optimization model; performing iterative optimization on the initial task planning strategy through a large language model, generating a new round of task planning strategy in each iteration, performing scoring by taking an optimization target as an evaluation function, stopping optimization until a preset number of iteration optimization times is reached, and outputting the task planning strategy with the highest score; and based on the task planning strategy with the highest score, performing remote sensing satellite group adaptive task planning. According to the method, multi-satellite distributed task planning can be effectively carried out on the dynamic task, the task income is improved, and the satellite imaging time consumption is reduced.

The invention discloses a low-orbit constellation multi-beam mode time-varying beam hopping scheduling method, which comprises the following steps that: firstly, a user feeds back user state information including a user rate demand, a user terminal beam quantity, each beam channel gain, a user position and the like to a satellite through a control channel; and the satellite determines a beam mode, the number of accessed users, scheduling of beams in each time slot and a power distribution strategy based on the user state information. The satellite generates beams according to the selected mode and sends data, beam space-time resource allocation can be carried out according to non-uniform user requirements, changing user requirements are adapted, and the satellite network capacity is improved.

In an aspect, a UE may transmit a first indication that the UE supports a capability to reduce power consumption associated with a constellation and code rate of at least a demodulator of the UE. The UE may receive, based on the first indication, a second indication to utilize a modulation and coding set (MCS) table from a plurality of MCS tables. The UE may receive data from a network node based on the MCS table.

The invention provides a direct communication method and device based on constellations, electronic equipment and a storage medium, and relates to the technical field of satellite communication. The direct communication method based on the constellation provided by the invention comprises the following steps: acquiring position information and historical communication information corresponding to a plurality of target communication areas respectively, and determining a distribution relationship among the plurality of target communication areas based on the plurality of pieces of position information; determining a target satellite screening criterion based on the distribution relationship and the historical communication information; based on a target satellite screening criterion, screening target satellites respectively corresponding to the plurality of target communication areas and applicable beam resources corresponding to the target satellites from the plurality of satellites to be selected; and controlling the target satellite to provide a communication service for the corresponding target communication area based on the applicable beam resources and the generated communication service instruction. The direct connection communication efficiency of the constellation satellites can be improved.

The invention provides a multi-satellite task scheduling method and system based on uniform revisit routine and emergency observation integration, and belongs to the technical field of remote sensing satellite task planning and autonomous scheduling. The method comprises the following steps: dividing a ground area into a plurality of observation grids based on orbit parameters and imaging parameters of a remote sensing satellite; traversing orbit time sequences of all satellites under a unified time axis, and dynamically planning conventional observation tasks of all satellites according to sub-satellite point positions of the satellites and grid observation marks; when an emergency observation request of a specific area is received, performing emergency observation task replanning according to a current satellite conventional observation task; and obtaining a satellite joint scheduling plan including a conventional observation task and an emergency observation task. The method has the advantages of high scheduling fairness, controllable attitude adjustment, high response speed and the like, and is suitable for an efficient task joint scheduling scene of a large-scale low-orbit remote sensing constellation in conventional and emergency states.

The invention provides an inter-satellite direct wave interference suppression method and system for synthetic aperture radar satellites. The method comprises the following steps: inputting SAR original echo data and system parameters thereof; calculating a pulse repetition frequency, a signal bandwidth and a frequency modulation rate; performing matched filtering and filtering on the original echo data to obtain an echo signal; and carrying out direct wave interference trapped wave processing and inverse matching filtering processing on the echo signal, and outputting original echo data after suppression processing. According to the method, signal self-correlation processing is adopted for detecting and suppressing the inter-satellite direct wave interference for the first time, the problem that an existing inter-satellite direct wave interference suppression processing method greatly depends on model applicability is solved, and important technical support is provided for subsequent large-scale SAR constellation earth imaging observation; direct wave interference is suppressed through a parameterization method, and the application effect of the SAR satellite in the fields of resource investigation, topographic mapping, disaster monitoring and the like is remarkably improved.

The invention discloses a hierarchical coordinate flipping coding method, device and system based on constellation joint shaping, and the method comprises the steps: carrying out the probability shaping of an original pseudo-random binary sequence, and generating a binary sequence with non-uniform probability distribution; performing serial-parallel conversion on the binary sequence with non-uniform probability distribution, and mapping the binary sequence to a pre-generated three-dimensional constellation; the method comprises the following steps: generating four different chaotic sequences by using a secret key and a four-dimensional multiphase hyperchaotic system, encrypting subcarriers and symbols by using two of the chaotic sequences, combining the other two of the chaotic sequences into a new chaotic sequence, and performing coordinate flipping on constellation points on a three-dimensional constellation by using the new chaotic sequence to obtain a three-dimensional constellation. And completing constellation point encryption. According to the invention, the security of the communication system can be ensured, and the damage to the transmission performance can be effectively reduced.