11 results about "Space segment" patented technology

The invention relates to a navigation deception signal detection method and device, equipment, a storage medium and a program product. The method comprises the following steps: determining a visual navigation satellite corresponding to a communication satellite by taking a geometric center of a beam coverage area of a directional beam generated by the communication satellite as a reference point; generating an enhanced navigation message according to the time service information of the communication satellite, the beam coverage area, the visual navigation satellite and the navigation message corresponding to the visual navigation satellite; and sending the enhanced navigation message to a user terminal in the beam coverage area, and detecting a deception signal by the user terminal according to the enhanced navigation message. According to the method, an inter-satellite exchange navigation message is included into a space section for processing, and a communication satellite sends an enhanced message signal to a user terminal in a beam coverage area, so that the user terminal performs external source verification on a local clock according to the enhanced message signal and compares the enhanced message signal with a local demodulation message, and therefore, under the condition of not depending on a ground private network, the user terminal can perform external source verification on the local clock. Therefore, the detection of the deception signal is realized, and the navigation deception resistance of the user terminal is improved.

The application discloses a method for resisting satellite Internet of Things uplink interference attack, and a satellite Internet of Things system comprises a central gateway, a plurality of service areas and a space segment; the service area comprises a plurality of legal terminal nodes, and the space segment is composed of one or more communication satellites in geostationary or non-geostationary orbits. Each communication satellite provides a single or multiple beams to cover different service areas, the satellite can connect the service areas to the central gateway, and then store collected messages and transmit the messages to the central gateway. The method comprises the following steps: calculating a MAC layer load G, calculating a preamble time, calculating an average data packet arrival number, and calculating a minimum IC step length under a specified detection probability through a Poisson distribution. The application has the advantages that the system performance decline caused by the preamble camouflage attack can be resisted, the preamble deception interference which has a great influence on the system performance is effectively eliminated, and the system stability is greatly improved.

The application discloses a low-orbit satellite navigation enhancement and ground CORS cooperative system and relates to the technical field of satellite navigation positioning, which comprises a space segment, a ground segment and a user segment; the space segment comprises a low-orbit satellite and is used for broadcasting navigation enhancement signals; the ground segment comprises an enhanced CORS network and a star-ground cooperative control center; each ground reference station simultaneously receives GNSS signals and navigation enhancement signals and generates observation data; the star-ground cooperative control center performs precise orbit determination based on low-orbit satellite downlink data and observation data, and uploads star-ground calculation results to the low-orbit satellite to update the generation parameters of the navigation enhancement signals; the user segment comprises a hybrid enhancement receiver, which is used for receiving GNSS signals, navigation enhancement signals and differential data and performing multi-source fusion positioning calculation. The application can improve the low-orbit satellite orbit determination precision, shorten the user initialization time, expand the service coverage, reduce the system construction cost and enhance the integrity guarantee capability.

The application provides a message transmission method, device and equipment and medium. A public prefix is planned for a network domain and a computing power domain corresponding to a ground segment and a space segment respectively, so that the limited bandwidth resources of inter-satellite and satellite-ground can be effectively adapted, and the influence of unstable bandwidth on message transmission can be avoided. By obtaining a message transmission path, dynamic topology changes of inter-satellite and satellite-ground can be flexibly coped with, and the transmission efficiency of message payload can be improved. By allocating a segment identifier to each routing node on each message transmission path according to the public prefix, each routing node can be sequentially jumped to in the message transmission process to perform corresponding services according to the planned path, without additional information announcement between the routing nodes, so that the announcement overhead caused by the limited bandwidth and dynamic topology changes of inter-satellite and satellite-ground can be significantly reduced. While guaranteeing network path forwarding, the collaborative scheduling demand of computing power resources and network resources can be met, and integrated routing message transmission of satellite-ground can be effectively realized.

The invention discloses a low-orbit narrowband Internet of Things constellation system and method based on satellite processing and hybrid backhaul, and belongs to the technical field of satellite communication. Comprising a space section formed by a plurality of satellites deployed in a specific inclination angle low earth orbit, a ground section provided with a plurality of gateway stations and operation and control centers in a global middle and low latitude area, and a plurality of Internet of Things terminals; wherein the satellite is configured with a communication load with on-satellite processing capability, and is used for receiving and processing an uplink short message sent by the terminal, and adaptively selecting a real-time forwarding mode or a store-and-forward mode to return the processed data to the ground based on the real-time visibility of the satellite and the gateway station. Through optimization design of constellation configuration and combination of on-satellite processing and hybrid backhaul mechanisms, efficient and reliable coverage of global key areas is realized under the condition that inter-satellite links are not needed, terminal power consumption and system complexity and cost are remarkably reduced, and the method is particularly suitable for burst short message services of wide-area distributed Internet of Things.

This invention provides a method for analyzing the cost uncertainty of a satellite constellation considering parameter uncertainties, comprising: estimating the total launch mass of the satellites, calculating the total launch mass of the satellite constellation based on the dry weight of a single satellite, the number of satellites, the wet weight to dry weight ratio, and the mass of the satellite distributor; calculating the launch segment cost, determining the number of launches based on the ratio of the total launch mass to the launch vehicle's carrying capacity, and calculating the total launch segment cost in conjunction with the price per launch; calculating the space segment cost, calculating the R&D cost and production cost separately, wherein the R&D cost is calculated based on the dry weight of the single satellite, and the production cost is calculated based on the dry weight of the satellites, the number of satellites, and the learning curve effect; calculating the total cost, adding the space segment cost and the launch segment cost to obtain the total cost of the satellite constellation; and assessing the uncertainty of cost parameters, constructing a Jacobian matrix of the total cost with respect to the uncertainty parameters, and analyzing the quantitative impact of the input parameter uncertainty propagating to the total cost estimation result.

The invention provides a space-based synthetic atomic time construction method, and belongs to the technical field of atomic time construction. According to the invention, under the condition that the ground timekeeping center is disabled, the high-performance time reference can still be maintained; on the basis of a precise clock difference product published by IGS, space-based synthetic atomic time construction is carried out on a space-segment star clock through the steps of data processing, performance evaluation, synthetic atomic time calculation and the like.

A method of autonomous anomaly detection and resolution in a remotely operated device system is provided. The method includes: performing an autonomous task with a remotely operated device in a space segment; collecting telemetry or imagery during performance of the autonomous task; providing the telemetry or imagery to an autonomy processing device; detecting an off-nominal event in the telemetry or imagery with an anomaly detection software module and sending anomalous event data to an executive runtime scripting engine; responding to the anomalous event data by automatically executing a response script for the anomalous event data by the executive runtime scripting engine to determine a command, the response script including scripting logic encoding a corrective response; sending the command from the autonomous processing device to a controller; and executing a corrective response to the anomalous event data by controlling the autonomous machine with the controller using the command.

The application discloses a kind of space section passage configuration auxiliary decision-making method and system, comprising: constructing directed weighted node-connection graph, node indicates satellite, and the directed line between node indicates signal direction;According to the connection relationship in directed weighted node-connection graph, attribute data is obtained, and attribute data includes at least one of the following: carrier signal bandwidth, carrier signal power, carrier signal modulation mode;Output space section passage best configuration.Through the application, satellite transponder multi-satellite signal transmission passage configuration situation can be optimized, and the efficiency of space section passage configuration can be effectively improved.

The application discloses a design method of a high-mobility stealth satellite communication system and relates to the technical field of satellite communication. The application comprises the following steps: step a: system silence and state presetting: a control center makes a satellite of a space segment enter an electromagnetic silence state, a satellite platform starts surface thermal management and retracts a protruding structure, and an orbit maneuver with no fixed period is planned and executed. The application improves the concealment and survivability of the satellite platform in orbit. By making the satellite enter a silence and survival state and implementing thermal management and shape control, combined with the orbit maneuver with no fixed period, the physical and orbit characteristics of the satellite are difficult to be observed and predicted for a long time, traditional detection and tracking means based on a fixed shape and a periodic orbit are invalid, and exposure risk of space assets is controlled. Meanwhile, communication adopts a "zero handshake" burst access mechanism based on one-time instructions, and open signaling interaction in a link establishment process is completely eliminated.

A method for optimizing satellite signal performance in a satellite transmission system. The method includes: obtaining signal data from at least some of the plurality of customer receivers, measuring the signal data from each of the signal beams that were obtained; analyzing metadata from the components of the satellite transmission system, signal source front end controls, and spectral sampling; identifying signal degradation at the satellite spacecraft in the space segment from the signal data of actual spot beam coverage using the measured signal data and the analyzed metadata; and predicting remediation actions to correct the signal degradation at the satellite spacecraft in the space segment.