20 results about "Ground segment" patented technology

The invention relates to a satellite system timing function test system and method based on a 1553B bus, a test device comprises an on-satellite part and a ground part, and the on-satellite part comprises a telemetering and remote control unit, a central management unit, a GNSS and a plurality of remote terminals; the ground part comprises a 1553B bus monitor, ground telemetering and remote control equipment and integrated testing equipment; the integrated test equipment edits a test case; comprising GNSS time function test cases (GNSS pulse per second output function test and GNSS time output function check), center management unit satellite time maintenance function check cases (center management unit ground timing function test, GNSS timing function test and synchronous pulse timing function test) and remote terminal satellite time maintenance function test cases (remote terminal satellite time maintenance function test cases). A synchronous pulse signal timing function is used for testing, and a second pulse timing function is used for testing. The problem that the current satellite time test cannot meet the test requirement is solved, and the correctness of the full-chain timing function from the BC end to the RT end is verified.

The invention discloses a satellite-ground integrated routing method suitable for a low-orbit constellation, and belongs to the technical field of satellite communication networks. According to the method, a'satellite-to-ground segmented bearing 'routing architecture is adopted, and inter-satellite routing and satellite-to-ground routing are designed in a decoupling manner and are independent from each other. The inter-satellite routing process adopts a mode of combining'top injection topology and autonomous routing ', initial topology is preset on the ground, satellites autonomously monitor link states and change information is synchronized in the whole network, and fault autonomous recovery and global routing convergence are realized; in the satellite-ground routing process, a mode of'injection on the ground and diffusion in the whole network 'is adopted, and the mapping relation between the gateway station and the landing satellite is quickly synchronized. In the forwarding process, according to whether the data fall to the ground or not, the satellite-ground routing tables are inquired to obtain destination satellite addresses, and then the inter-satellite routing tables are inquired to carry out hop-by-hop forwarding. According to the method, the problem of frequent convergence of satellite-ground routing caused by rapid movement of the satellite is effectively solved, the routing dynamics is simplified, and the method has the advantages of being small in protocol overhead, rapid in fault recovery and high in engineering realizability.

The embodiment of the invention provides a 1553B bus terminal resistor intelligent switching system based on an optocoupler-MOS relay, and can solve the technical problem that the operation reliability of a carrier rocket is reduced when terminal resistors are switched in the prior art. The system comprises a 1533B bus and a plurality of terminal resistor switching modules, and the corresponding terminal resistor switching modules can be configured for multi-stage separation scenes (a ground section, a first-stage section and a second-stage section) to switch terminal resistors. The terminal resistor switching module comprises a first optocoupler-MOS relay, a first terminal resistor, a second optocoupler-MOS relay, a second terminal resistor and a microcontroller, and the microcontroller is used for receiving an instruction of the flight control computer so as to control the on-off of the first optocoupler-MOS relay and the second optocoupler-MOS relay. The 1533B bus is provided with the first channel and the second channel, the switching function failure problem can be avoided, meanwhile, the terminal resistor intelligent switching system provided by the embodiment of the invention is free of electromagnetic interference, and therefore the reliability of a repeatable carrier rocket launching task is improved.

The invention discloses a ground high-speed data injection method and system for a deep space K frequency band. The method comprises the steps that a remote control injection demand instruction is acquired through front-end software; obtaining type information of the remote control injection demand instruction, and determining a matched target coding strategy based on the type information; coding the remote control injection demand instruction based on the target coding strategy to obtain a coding file; based on a preset multi-software layered transmission protocol, forwarding the coded file to station control software and one or more other demand receivers, and transparently forwarding the coded file to baseband software to obtain transmission result data; a dynamic regulation and control strategy is determined based on the data flow rate monitored by baseband software in real time, the cache size of the cache space is adjusted based on the dynamic regulation and control strategy, and a target cache space is obtained and used for caching transmission result data. Through diversified injection data processing, a multi-software layered transmission protocol and dynamic caching, efficient, stable and reliable remote control data injection of the ground section of the K frequency band in the deep space task is realized.

The disclosed techniques are suitable for forward link transmissions and / or reverse link transmissions between satellite and ground segments of a satellite communication system (SCS).

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.

A satellite communication system is provided that uses a plurality of optical feeder links between its ground segment and its spatial segment and employs spatial diversity transmissions that split individual user data streams into substreams that are transmitted across two or more of the optical feeder links, thus, it is possible to restore the complete flow at the receiving end despite impairments that affect the individual feeder links on which the flow is split. Further, the system applies beamforming individually with respect to the feeder link, which means that there is no need for transmission time alignment between respective ones of the substreams. The spatial diversity transmission occurs in a forward direction or a return direction, or both, and may be employed on a conditional basis, and may be dynamically adjusted with respect to individual user terminals, groups of user terminals, or a population of user terminals throughout.

The application discloses a kind of based on interference vector and physical feature's unmanned plane interference source positioning method and system, the method includes: the physical feature of interference source collected by unmanned plane is obtained, by the physical feature of the interference source, the actual position of the interference source is positioned several times to the interference source, establishes vector positioning model, to locate the actual position of the interference source.The application is connected with the communication of ground part and unmanned plane, and the calculation pressure of the flight control system of unmanned plane itself is reduced in ground part;By importing interference white list, reduce the invalid calculation in the process of interference investigation;Using vector positioning model to locate interference source, so that positioning is more accurate;In addition to using GNSS to locate, interference source photo and interference source surrounding environment video are also used, to reduce the difficulty of interference source positioning in later field processing.

Methods and systems are described for providing end-to-end beamforming. For example, end-to-end beamforming systems include end-to-end relays and ground networks to provide communications to user terminals located in user beam coverage areas. The ground segment can include geographically distributed access nodes and a central processing system. Return uplink signals, transmitted from the user terminals, have multipath induced by a plurality of receive / transmit signal paths in the end to end relay and are relayed to the ground network. The ground network, using beamformers, recovers user data streams transmitted by the user terminals from return downlink signals. The ground network, using beamformers generates forward uplink signals from appropriately weighted combinations of user data streams that, after relay by the end-end-end relay, produce forward downlink signals that combine to form user beams.

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.

In one implementation, a system for space-based aircraft monitoring includes a ground segment, multiple aircraft monitoring payloads on board corresponding satellites, and a resource scheduling system. Individual payloads include antenna systems configured to provide multiple beams for receiving ADS-B messages and two or more receivers configured to process received ADS-B messages that are implemented, at least in part, by reconfigurable FPGAs. In addition, individual payloads are configured to initiate transmission of ADS-B messages processed by one or more of their receivers to the ground segment. Meanwhile, the ground segment is configured to receive such messages and to route them to one or more destinations for aircraft monitoring. The resource scheduling system is configured to control the antenna systems of individual payloads to dynamically adjust the beams for receiving ADS-B messages of the individual antenna systems.

Systems and methods of the present disclosure may use a satellite operations center (SOC) to receive satellite commanding workflows associated with satellites in a fleet of satellites, where each satellite commanding workflow includes tasks configured to trigger at least one fleet operations ground segment element to generate at least one satellite command to cause at least one change in at least one of the satellite payload or the satellite bus. The SOC may determine contact windows associated with the satellites. The SOC may determine a command order of the satellite commanding workflows based on the contact windows and append each satellite commanding workflow to a satellite command queue according to the command order. The SOC may automatically instruct, upon each contact window commencing, satellite communication infrastructure to transmit the satellite command(s) of each successive satellite commanding workflow in the satellite command queue according to the command order.

The invention provides a message transmission method and device, equipment and a medium, which can effectively adapt to inter-satellite and satellite-ground limited bandwidth resources by planning a common prefix for a network domain and a computing power domain corresponding to a ground segment and a space segment respectively, and avoid the influence on message transmission caused by unstable bandwidth. By acquiring a message transmission path, dynamic topology changes between satellites and between satellites and the ground can be flexibly dealt with, and the transmission efficiency of a message payload is improved; according to the invention, the segment identifier is allocated to each routing node on each message transmission path according to the public prefix, so that the message can be sequentially skipped to each routing node to execute corresponding service according to the planned path in the message transmission process, and information does not need to be additionally announced among the routing nodes; the notification overhead caused by inter-satellite and satellite-ground limited bandwidth and dynamic topology change is obviously reduced; while network path forwarding is guaranteed, the cooperative scheduling requirement of computing power resources and network resources is met, and satellite-ground integrated routing message transmission is effectively realized.

Systems and methods of the present disclosure may use a satellite operations center (SOC) to receive satellite commanding workflows associated with satellites in a fleet of satellites, where each satellite commanding workflow includes tasks configured to trigger at least one fleet operations ground segment element to generate at least one satellite command to cause at least one change in at least one of the satellite payload or the satellite bus. The SOC may determine contact windows associated with the satellites. The SOC may determine a command order of the satellite commanding workflows based on the contact windows and append each satellite commanding workflow to a satellite command queue according to the command order. The SOC may automatically instruct, upon each contact window commencing, satellite communication infrastructure to transmit the satellite command(s) of each successive satellite commanding workflow in the satellite command queue according to the command order.

Examples are disclosed that relate an approach for automatically annotating a LiDAR point cloud of an airport with classification labels. In one example, a computing device comprises one or more processors configured to execute instructions stored in memory to receive LiDAR data for an airport environment, wherein the LiDAR data includes a LiDAR point cloud including a plurality of points in the airport environment, segment the LiDAR point cloud into a ground region and a non-ground region, automatically cluster, via a trained machine learning model, different points in the non-ground region into a plurality of non-ground segments, automatically annotate, via the trained machine learning model, the plurality of non-ground segments with classification labels selected from an airport domain, and output a panoptic labeled LiDAR point cloud including the plurality of non-ground segments labeled with respective classification labels and the points in the ground region.

The disclosed methods and apparatus embody advantageous beamforming techniques for use in satellite communication systems (SCS). The ground segment of the SCS calculates beam weights for use by a satellite-borne beamformer. The beam weight calculation depends on the satellite providing per-element sounding signals to the ground segment, which correspond to the reception of channel sounding signals from one or more user terminals (UTs) located within the user beam coverage area by the satellite-borne phased array antenna. Access to these per-element sounding signals supports ground-based estimation of the propagation channel between the phased array antenna and the UTs, wherein the beam weights are calculated based on the channel estimation and output for uplink transmission to the satellite. In one or more embodiments, the satellite-borne beamformer operates in the digital domain, wherein the beam weights are digital values.

The present invention relates to a geological disaster early warning and alarm system for civil aviation navigation stations, comprising a power supply module, an alarm module, and a monitoring device. The monitoring device comprises a wall portion and a ground portion, the wall portion comprising a detection box, a wiring module, and a control module, the detection box comprising a box body; the ground portion comprising a base for connecting to the ground and a detection component connected to the base; the detection component comprising a conductive conductive rod, an upper contact portion and a lower contact portion connected to the conductive rod; a conductive component adapted to the conductive rod is provided within the box body; the power supply module is an independent module outside the monitoring device, the power supply module is respectively connected to each monitoring device, and each monitoring device is respectively connected to the alarm module. This system can not only simultaneously monitor ground subsidence, wall subsidence, wall displacement, and wall tilt, significantly improving safety, but also has an automatic geological disaster early warning and alarm function, which can play a more effective warning role and reduce casualties.

This invention discloses a method and system for autonomous switching of satellite operating modes based on an on-board templated instruction library. The method includes encapsulating instruction sequences for different satellite operating modes into standardized task templates to form an on-board templated instruction library, which is stored on the satellite. The ground segment generates task definition instructions and uploads them in batches to the satellite, which stores them as a planned task queue. At the planned execution time, the corresponding task template in the on-board templated instruction library is invoked, and the instruction sequence is sent to each subsystem. The method also includes a two-stage task execution safety constraint judgment during the task definition instruction upload stage and the initial stage of task execution. The system includes a ground segment subsystem and an on-board autonomous execution subsystem, which communicate bidirectionally via a space-ground telemetry and control link. This invention significantly reduces the amount of uplink instructions, alleviates the pressure on telemetry and control resources, improves the satellite's autonomous intelligence level and task response speed, enhances operational reliability, and achieves a standardized and universal technical architecture.

Methods and systems are described for providing end-to-end beamforming. For example, end-to-end beamforming systems include end-to-end relays and ground networks to provide communications to user terminals located in user beam coverage areas. The ground segment can include geographically distributed access nodes and a central processing system. Return uplink signals, transmitted from the user terminals, have multipath induced by a plurality of receive / transmit signal paths in the end to end relay and are relayed to the ground network. The ground network, using beamformers, recovers user data streams transmitted by the user terminals from return downlink signals. The ground network, using beamformers generates forward uplink signals from appropriately weighted combinations of user data streams that, after relay by the end-end-end relay, produce forward downlink signals that combine to form user beams.