67 results about "High-throughput satellite" patented technology

The invention discloses a multi-beam pointing on-orbit calibration method suitable for a high-throughput satellite. A satellite-borne on-orbit calibration system comprising an antenna to be calibrated, a radio frequency channel, a tracking receiver, an antenna controller and an antenna driving mechanism is used; a single-pulse tracking system is adopted; and aiming at the current situation that the high-throughput satellite adopts a multi-beam design, the beam width is relatively narrow and the gain of a coverage area is easily influenced by a pointing deviation, a calibration signal of a ground beacon station is received, and antenna beam pointing is subjected to closed-loop automatic correction, so that multi-caliber multi-beam antenna pointing is calibrated, and the requirements of thesystem on beam seamless coverage and the gain of the coverage area of the satellite are met.

The invention provides a high-throughput satellite communication system beam hopping method. According to the method, uniform clustering is carried out on total beams according to a business requirement, an objective function is established for the requirement, whether edge beam distance of adjacent clusters is equal to 2R and the same are in working status is monitored, if not, performance satisfies direct calculation of frequency spectrum efficiency, and if yes, an interference avoidance measure is taken, then the frequency spectrum efficiency is calculated, a KKT condition is used for solving of time slot allocation numbers of a closed-form solution, finally, rounding-down is carried out according to values of the closed-form solution, the same is optimized, and optimal capacity allocation is obtained. The method has the advantages that a dynamic requirement of capacity can be satisfied, frequency spectrum efficiency can be improved, and performance decreasing caused by interferenceof the same frequency can also be avoided.

A calibration system of architecture, apparatus, algorithms and method for optimizing leakage performance of a multi-port amplifier (MPA) for satellite communications. The calibration system comprises simple onboard apparatus and generally on-ground algorithms implementation connected via telecommand and telemetry links. The isolation performance of the MPA is monitored by using a commandable frequency generator and a flexible narrowband receiver. The high performance is achieved by direct and efficient optimization of the aggregate leakage of the MPA. The calibration system may be applied but not limited to Ku and Ka-band high throughput satellite systems.

A method is provided for dynamically allocating the radio resources of a satellite and a very high throughput satellite system configured to implement this method. The method of allocation is executed by a piece of ground equipment called a Radio Resource Manager. The method of allocation according to the invention, allocates dynamically in time frequency resources to each spot of the multibeam coverage in accord with the conditions of propagation of the radio signals (in particular the attenuations due to bad weather) prevailing in the spots, with the current and future spot data traffic profile, with the level of interference generated in the neighbouring beams. The method preferentially applies in respect of downgoing forward links, that is to say from the satellite to the user terminals.

The invention discloses a high-throughput satellite formation data transmission method based on network coding. The high-throughput satellite formation data transmission method comprises a transmission satellite and K receiving satellites, wherein K is larger than 1; each receiving satellite feeds back a decoded data packet state to the transmission satellite according to a competitive feedback mechanism after receiving a coded data packet of the transmission satellite; and the transmission satellite adjusts sliding steps of a sliding window according to the data packet state, selecting a next group of coded data packets and transmits the next group of coded data packets to the receiving satellites. Through transmission of the data packets in the manner, retransmission times can be reduced effectively; feedback times are reduced; and network throughput is increased.

A high throughput satellite and a method of operating a high throughput satellite. The satellite has multiple modes of operation and transitions between them in response to the spectrum fill rate. Modes of operation may include altering color (spectrum) re-use patterns to increase or reduce number of colors, using intra-beam geographic sub-division, or precoding downlink signals.

The invention discloses a satellite channel high-speed reliable data transmission method based on DPDK, and belongs to the technical field of satellite communication. According to the method, a polling receiving mode provided by the DPDK in a user space is utilized to directly receive data from a network card to an application program and bypass a Linux kernel network protocol stack, so that frequent CPU interruption and memory copying are avoided, and the data processing efficiency is remarkably improved. The received data message is processed in the user space according to the protocol typeof the received data message, and for a non-TCP message, only a simple cache is needed, and the non-TCP message is forwarded from the other port after waiting for the token; for TCP messages, it is necessary to process according to SCPS-TP protocol flow to overcome the characteristics of long time delay, high error code and the like of the satellite channel. The method can effectively improve thesatellite channel utilization rate of reliable data transmission, is completely compatible with a TCP protocol, and is especially suitable for reliable data transmission in a high-throughput satellite system.

The invention discloses an on-satellite transparent exchange method for a high-flux satellite communication system. The method aims at the requirement of 'one belt and road' for large-capacity and large-bandwidth satellite communication coverage. However, the high-throughput satellite communication system has the disadvantage that a plurality of gateway stations need to be built abroad and returning to the domestic only by depending on international optical cables. A satellite user wave beam and a feed wave beam are hinged; partial frequency bands of user beams are gathered to a territorial feed beam, and the territorial feed beam is communicated with a domestic ground gateway station, so that high-throughput satellite communication does not completely depend on the limitation of foreign deployment gateway stations and rental international optical cables. The use flexibility of a high-throughput satellite communication system is improved, and the use scene of the system is expanded. Compared with the traditional high-throughput satellite communication system architecture, the method provided by the invention overcomes the problems that the rate from the user beam to the feed beam is high and the user beam cannot be downloaded through one feed beam, and solves the problem that the beams cannot be directly connected on the satellite.

Method for determining high-throughput-satellite (HTS) system user downlink signal-to-noise-plus-interference ratios (SNIRs) and SNIR distributions is provided, including a procedure for estimating parameters of one spot beam and that for multiple co-color spot beams, and the projection of the satellite antenna radiation patterns onto Earth to form the spot beam power spatial distributions that lead to the SNIRs and SNIR distributions of stationary or mobile user terminals (UTs) in clear sky (CS) line-of-sight (LOS) propagation channel conditions. The estimation precision is controllable. The method is implemented in a programming language run on computational hardware with built-in or connected user interface (UI) devices including desktops, laptops, severs or super-computers. It can be used alone or as part of a simulation package or part of a system operation management software of the control gateway (GW) in the HTS system for system downlink designs.

The invention discloses a multi-beam high-flux satellite forward link power band balancing system, and relates to the technical field of satellite communication. The multi-beam high-flux satellite forward link power band balancing system comprises a gateway station main station carrier wave monitoring system, a satellite monitoring system and a gateway station small station carrier wave monitoring system. The gateway station main station carrier wave monitoring system is connected to the satellite monitoring system; the satellite monitoring system is used for realizing satellite telemetry parameter monitoring, and the satellite monitoring system is connected to the gateway station small station carrier wave monitoring system; the gateway station small station carrier wave monitoring system is used for realizing reverse carrier wave real-time polling monitoring, and the gateway station small station carrier wave monitoring system is connected to the gateway station main station carrier wave monitoring system; the multi-beam high-flux satellite forward link power band balancing system has a normal monitoring cycle state and an abnormal monitoring cycle state. The method has the beneficial effects that the system stability of the whole forward link is greatly improved, and monitoring circulation is performed in each link in the link.

The invention discloses a large Doppler wireless communication time-frequency synchronization method based on OFDM, and belongs to the technical field of wireless communication. The method comprises the following steps: realizing symbol coarse timing synchronization by utilizing a preamble symbol; realizing large Doppler frequency offset coarse estimation by utilizing the preamble symbol; carryingout frequency offset preliminary compensation correction on the symbol by using the frequency offset estimation value; performing correlation operation on the PSS symbol subjected to frequency offsetpreliminary compensation and a locally known PSS symbol; realizing accurate timing synchronization of the symbol, performing FFT operation on the data symbol, realizing signal time-frequency domain conversion, and realizing residual frequency offset estimation and real-time compensation through a first-order filtering frequency-locked loop by utilizing a frequency domain pilot frequency in the received data symbol and a locally known pilot frequency. According to the invention, time and frequency synchronization of a wireless communication system in an OFDM-based large Doppler scene can be realized under the condition that a user terminal and a gateway station have no ephemeris, and the synchronous demodulation requirements of a future broadband high-throughput satellite under large Doppler and multipath conditions are met.

The invention discloses a satellite fusion unmanned aerial vehicle carried 5G communication base station air-to-ground networking system, which comprises a 5G communication base station device, a line-of-sight link airborne terminal and a Ka satellite communication airborne terminal which are integrated on an unmanned aerial vehicle platform, and a ground control station and a gateway station, the Ka satellite communication airborne terminal and the gateway station form a Ka satellite communication link through the low-orbit broadband communication satellite, and the 5G communication base station equipment and the line-of-sight link airborne terminal are both connected with the Ka satellite communication airborne terminal. According to the system, the 5G communication technology and the Ka high-throughput satellite communication system can be utilized to provide networking service with lower delay and larger bandwidth, and access of more ground terminal users is supported.

The invention discloses a high-throughput satellite terminal beam switching method and device based on a 5G core network. The method comprises the following steps: periodically receiving position information reported by a satellite terminal through a network management system, judging whether the satellite terminal needs to carry out beam switching or not according to the position information, if so, notifying a target network control center to carry out resource preparation, notifying a source Internet gateway to carry out a switching preparation start command; meanwhile, satellite network data in the target internet gateway are sent; after the switching preparation work is completed and the network management system receives a switching start confirmation message sent by the source internet gateway, the satellite terminal is notified to log in a specified target beam in a mode that a source network control center sends a unicast satellite terminal information message; and after the satellite terminal completes beam switching, the target network control center notifies the target Internet gateway that switching is completed through the network management system. According to the invention, beam switching and exception handling of the satellite terminal can be successfully completed.

The invention discloses a high-throughput satellite beam on-demand scheduling method based on service priority and rate adaptation. The method comprises the following steps: measuring the service flow and channel capacity of each beam cell in a downlink scene of a low-orbit high-throughput satellite system; establishing a nested optimization problem of a maximized adaptive rate regulation factor and a maximized system throughput according to the obtained data, and dynamically allocating the adaptive rate regulation factor and beam service time of each cell by taking average stay time and the number of beams as constraints; firstly, allocating high-priority services preferentially according to beam service time; secondly, allocating beam cells without same-frequency interference based on a longest queue principle; and finally, when spare beams exist, selecting cells with same-frequency interference according to a minimum same-frequency interference cost function to provide services. According to the method, the problem of resource waste of a predetermined full coverage mode in a downlink scene of a low-orbit high-flux satellite system is solved, and a plurality of cells can be covered by a small number of beams in a time division multiplexing mode.

The invention discloses an automatic ship meteorological observatory of Beidou system. The automatic ship meteorological observatory comprises a meteorological information publishing server, a ship position information server, a marine meteorological information data server and an electronic chart data server; the meteorological information publishing server is synchronously connected with the marine meteorological information data server through GPRS, the ship position information server comprises a ship information collection module, a ship information storage module and a ship information publishing module, the marine meteorological information data server comprises an automatic marine meteorological information downloading module, an automatic marine meteorological information storagemodule and a marine meteorological information publishing module, and the electronic chart data server comprises a chart data management module, a chart data rendering module and a chart data publishing module. Through the arrangement of a high-flux satellite broad-band and the marine meteorological information data server, meteorological and hydrological information of the region where a ship onthe sea locates can be monitored in real time and can be transmitted through the high-flux satellite broad-band.

A method comprises a preprocessing step consisting, in the gateway station, in pre-segmenting the data as a function of the carrier frequency which is dedicated to them on the downlink DL, in reassembling and in encapsulating the pre-segmented data in successive basic frames DL BB-Frames, that can be transmitted over the downlink, each basic frame DL BB-Frame of the downlink being encapsulated by addition of a specific transport header DL BB-TH on the downlink and a data field, and a step consisting, in the gateway station, in incorporating the different basic frames DL BB-Frames of the downlink in the data field of the different basic frames UL BB-Frames of the uplink.

A high throughput satellite communication system and method of satellite communication that provide loopback capability and increased throughput is disclosed. The satellite communication system and method of satellite communication utilize pre-distortion based on remotely estimated characteristics of a satellite transponder's power amplifier (PA). The pre-distortion is applied to the hub modulator's constellation.

The invention provides an information security transmission method and device in a high-throughput satellite communication system. The high-throughput satellite communication system comprises a high-throughput satellite, a gateway station, a legal user and an eavesdropper; the method is configured in the gateway station, and the method comprises the following steps: determining a beam forming weight vector by using a beam forming method; processing the data signal of the legal user according to the determined beam forming weight vector, and sending the processed signal to a high-throughput satellite through a large-capacity photoelectric hybrid feed link. According to the method, all or part of beam forming tasks are transferred to the ground gateway station from the satellite to be completed. According to the ground-based beam forming technology, beams are formed through a ground gateway station, and multi-beam coverage of a service area is achieved. The operation complexity, the hardware complexity, the power consumption and the like which can be borne by the gateway station equipment are much higher than those of a satellite, so the cost and the implementation difficulty of a communication system can be integrally reduced, and the flexibility is remarkably improved.

The invention relates to a power grid communication network switching method and device and a power grid communication system. The method comprises the steps: obtaining the geographic position of a first object, and judging whether the first object is located at a ground communication network coverage center or not according to the geographic position of the first object and a preset communicationnetwork coverage area table; when the first object is not located at the coverage center of the ground communication network, determining that a target communication network is a Ka high-throughput satellite network, comparing the target communication network with a communication network accessed last time; when the target communication network is different from the communication network accessedlast time, switching the communication network to the Ka high-throughput satellite network, wherein switching of power grid communication networks in remote areas or model coverage blind areas is realized, and the stability of the communication networks is improved.

The invention discloses an HTS gateway station data processing method and system based on a 5G heterogeneous access architecture, and the method comprises the steps that centralized processing equipment receives a first signal transmitted by at least one piece of baseband processing equipment, wherein the first signal is a signal obtained after each piece of baseband processing equipment performsreal-time processing on a received signal in real time sent by a high-throughput satellite HTS gateway station; and the centralized processing equipment performs non-real-time data processing on the first signal to obtain a second signal, and sends data information in the second signal to a core network. According to the method, the technical problem of poor space-ground integrated network performance in the prior art is solved.

The invention discloses a data transmission method for a forward link of a high-throughput satellite system. The data transmission method comprises the following steps: selecting two gateway stations with the best channel quality from a plurality of independent and irrelevant gateway stations on the ground to carry out Alamouti space-time coding; enabling a high-throughput satellite to obtain the satellite-ground link statistical channel state information according to the position information of the user; completing a beam forming scheme design based on a virtual signal to interference plus noise ratio criterion; performing user scheduling according to 1-bit information fed back by each user to obtain an optimal user combination and a beam forming weight vector under the same time-frequency resource condition; enabling the ground gateway station to send the scheduled signal to the high-throughput satellite through the feed link, and enabling the high-throughput satellite to carry out beam forming processing on the received signal and then forward the signal to a corresponding user on the ground. According to the method, the capacity requirement of large-scale access can be effectively met, and the system capacity can be improved under the condition that the system overhead is reduced.

The invention discloses a power grid Ka high-throughput satellite network communication fault judgment method and device, and the method comprises the steps: carrying out the network fault monitoring, carrying out the intelligent recording of network state information when a network fault occurs, uploading the recorded network state information to a satellite network management platform when the monitoring result shows that the connection of the satellite network management platform is recovered, and carrying out the fault judgment of the Ka high-throughput satellite network. Through neural network learning of historical sample data by the management platform, an influence model of meteorological and position information on network state information is trained, centralized management and control are realized, the power grid Ka high-throughput satellite network communication fault judgment efficiency and precision are improved, and the method is high in accuracy, high in speed and good in real-time performance.