9 results about "Ground segment" patented technology

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 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.

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.

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.

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.

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.