29 results about "Geosynchronous satellite" patented technology

The invention discloses an intelligent earth surface solar radiation forecasting method based on satellite remote sensing, and belongs to the field of information technology and meteorological technology. The method comprises the following steps: S1, acquiring geostationary satellite observation data, satellite inversion earth surface solar radiation data and terrain factor data, and executing Z-score standardization processing; s2, performing dimensionality reduction on the standardized input sequence and the target data by using a pre-training auto-encoder to obtain latent variables of a historical sequence and a future cloud picture observation sequence; s3, inputting the dimension-reduced historical sequence into a conditional potential space diffusion model, modeling the historical satellite cloud picture sequence, and predicting a probabilistic potential variable of a cloud picture at a future moment; converting the solar radiation prediction result into a corresponding earth surface solar radiation prediction result through an inversion model; and S4, the self-encoder is adopted to perform dimension raising to obtain a final prediction result. According to the method, based on a frequency domain and space domain multi-modal feature adaptive fusion mechanism, while a complex cloud-radiation relation is modeled, predicted structural consistency and physical rationality of radiation intensity are kept.

The focus of the present disclosure relates to a secure global satellite network that securely transmits data from a ground station to one or more geosynchronous orbit satellites within a communicatively linked constellation of geosynchronous satellites. The communicatively linked constellation of geosynchronous satellites covers the entire planet, allowing access to users anywhere on the planet. The communicatively linked constellation of geosynchronous satellites also covers satellites in orbit above the planet, enabling any satellite to send or receive data through the communicatively linked constellation of geosynchronous satellites at any point in the satellite's orbit. The communicatively linked constellation of geosynchronous satellites functions as a communications backbone, enabling global communications coverage between any points on the earth, between any point on the earth and a satellite anywhere in its orbit, or between two satellites anywhere in their orbit.

In some embodiments, a communications system can include a plurality of low earth orbit (LEO) satellites deployed at different altitudes and configured to communicate with one or more terrestrial devices and with one another. The communications system may further include a plurality of geosynchronous (GEO) satellites deployed above the plurality of LEO satellites. The plurality of LEO satellites may cooperate with one another and with the plurality of GEO satellites to provide a global communication network having redundant point-to-point communication.

Techniques are described herein for non-terrestrial network (NTN) communications via one or more transparent-mode non-geosynchronous (NGSO) satellites. Embodiments extend a terrestrial wireless network (TWN), such as 5G NR, for use with the satellites. Analog feeder uplink and downlink waveforms are formatted to carry forward and return direct-to-device (DtD) signals over respective subchannel channels, and the subchannels can be assigned with time and frequency dimensions that are compatible with resource block assignments of the TWN protocols. Use of the analog subchannels and time-division multiplexing with beam-hopping facilitates satellite communication of the DtD signals effectively as an extension of the TWN. Embodiments also support communication of satellite control signals as part of the analog feeder uplink waveform, and inter-satellite link (ISL) routing and communication on-board the satellite.

In some embodiments, a communications system can include a plurality of low earth orbit (LEO) satellites deployed at different altitudes and configured to communicate with one or more terrestrial devices and with one another. The communications system may further include a plurality of geosynchronous (GEO) satellites deployed above the plurality of LEO satellites. The plurality of LEO satellites may cooperate with one another and with the plurality of GEO satellites to provide a global communication network having redundant point-to-point communication.

The application discloses a satellite remote sensing fire point real-time monitoring method based on space-time feature fusion, acquires historical remote sensing image data of geosynchronous satellite corresponding to a required prediction moment, constructs space information, band information and time information contained by each pixel point in each historical remote sensing image, and expands the number of fire points according to a copy method, combines a "rumination" method, completes the establishment of a data set, then takes the reconstructed pixel points of each historical remote sensing image in the data set as input, takes the actual fire point condition of each historical remote sensing image as output, trains a monitoring network model, finally constructs space information, band information and time information contained by each pixel point in a remote sensing image of a prediction moment of a required prediction date, inputs the reconstructed pixel points into the trained monitoring network model for feature extraction, and outputs final pixel classification results, generates a fire point map after visualization, and thus completes fire point monitoring.

In exemplary embodiments communication resiliency methods and systems for tribal ground stations may be described. An exemplary communication system may include a first ground station and a second ground station. The first ground station and the second ground station may be located on one or more tribal reservations. The first ground station and second ground station may be connected to a satellite. The satellite may be, for example but not limited to, geostationary (GEO) satellites, mid earth orbit (MEO) satellites, low earth orbit (LEO) satellites, polar orbiting satellites, and / or communication satellite constellations. In some embodiments the satellite may be a LEO satellite that provides direct communication between the first ground station and the second ground station.

A satellite communications network (SCN) advantageously features selective use of a diversity service mode and a non-diversity service mode for providing service to individual user terminals (UTs) using a constellation of non-geosynchronous satellites included in the SCN. For example, for providing service to any given UT, the SCN may switch from the non-diversity service mode to the diversity service mode in response to determining that the non-diversity service includes one or more constrained view angles. The constrained view angles may be learned for the UT's location based on past monitoring by the SCN or may be estimated from view angle constraints learned for one or more locations in the vicinity of the UT's location.

The invention relates to a wireless network interference detection and positioning system based on an end-to-end performance test, and the system comprises a cloud service platform which issues a task scheduling instruction and a test instruction to a test device, and carries out the data analysis and result visualization based on an index fed back by the test device; a geostationary satellite providing a geostationary satellite signal including clock and geolocation information; the test equipment receives a test instruction of the cloud service platform after executing test equipment positioning and time service, collects an air interface index and an end-to-end performance index, and generates test data traffic; the test equipment sends the test data flow to the test server and receives test result data returned by the test server; and the test server is responsible for processing the data surface traffic, executing an end-to-end performance test based on the received test data traffic, and sending test result data back to the test equipment. Compared with the prior art, the method can actively realize interference detection, type diagnosis and accurate positioning.

Techniques are described herein for non-terrestrial network (NTN) communications via one or more transparent-mode non-geosynchronous (NGSO) satellites. Embodiments extend a terrestrial wireless network (TWN), such as 5G NR, for use with the satellites. Analog feeder uplink and downlink waveforms are formatted to carry forward and return direct-to-device (DtD) signals over respective subchannel channels, and the subchannels can be assigned with time and frequency dimensions that are compatible with resource block assignments of the TWN protocols. Use of the analog subchannels and time-division multiplexing with beam-hopping facilitates satellite communication of the DtD signals effectively as an extension of the TWN. Embodiments also support communication of satellite control signals as part of the analog feeder uplink waveform, and inter-satellite link (ISL) routing and communication on-board the satellite.

The application discloses a time-difference-based synchronous orbit satellite fast maneuvering detection method, and aims at the problem of maneuvering detection of synchronous orbit satellites under a radio monitoring system. The difference between the time-difference measurement value of satellite signals arriving at two receiving stations and the theoretical value calculated by a predicted ephemeris can be approximately a linear function of satellite position error. The difference between two different time points is used as a test statistic to detect whether the satellite has maneuvered. The application greatly reduces the number of estimated parameters and the demand for observation arc length, and only needs two receiving stations to observe a short arc segment for several minutes to realize fast maneuvering detection of the synchronous orbit satellite, thereby reducing the system complexity and improving the timeliness of the system.

An advantage of the satellite communication network (SCN) of the present invention is characterized by selectively using a diversity service mode and a non-diversity service mode to serve individual user terminals (UTs) using constellations of non-geostationary satellites included in the SCN. For example, for any given UT, the SCN may switch from a non-diversity service mode to a diversity service mode in response to determining that the non-diversity service relates to one or more restricted perspectives. The restricted viewing angle of the UT location may be learned based on past monitoring by the SCN, or the restricted viewing angle may be estimated from viewing angle restrictions learned for one or more locations near the UT location.

A method performed by a ground station antenna system for tracking a non-Geo satellite. A signal is received from the satellite and a signal quality metric associated with the signal is estimated. A first tracking mode is selected and implemented when the estimated signal quality metric is below a threshold, in which the signal is demodulated to obtain demodulated signal quality metric (DSQM) estimates, and then a first tracking operation is performed to point an antenna beam at the satellite based on the DSQM estimates. A second tracking mode is selected and implemented when the estimated signal quality metric is above the threshold, in which signal strength estimates of the signal are obtained and then a second tracking operation is performed to point the antenna beam at the satellite based at least in part on the signal strength estimates.

The application discloses a satellite-based time service method and device, electronic equipment and storage medium, comprising: receiving a short message signal of a geosynchronous satellite, the short message signal comprising an uplink time delay of a standard time sent by a ground control center to the geosynchronous satellite; receiving a navigation message of the geosynchronous satellite and obtaining a correction parameter of coordinated universal time from the navigation message; calculating a downlink time delay of the geosynchronous satellite to a time service device based on the uplink time delay; calculating a local time of the time service device by using the standard time, the uplink time delay, the correction parameter and the downlink time delay; and performing time service by using the local time, without positioning the time service device to calculate the downlink time delay, and without occupying the calculation resources of the ground control center, compared with the prior art, the time service time is shortened, the influence of the calculated position on the time service precision is reduced, and the time service speed and precision are improved.

The embodiment of the invention provides an offshore wind turbine generator time synchronization method and device, electronic equipment and a storage medium, and the synchronization method comprises the steps: obtaining target time information which is obtained based on geostationary satellite signals; respectively acquiring current time information of a plurality of data collectors of the offshore wind turbine generator; and based on the target time information, synchronizing the current time information to obtain synchronous time information. The current time information is synchronized through the target time information obtained based on the geostationary satellite signal, so that the time accuracy of data in different transmission modes is realized; the data collectors are synchronized by adopting the same time source, so that the time consistency of the offshore wind turbine generator system is enhanced; the accurate time synchronization is beneficial to reducing errors in the data transmission process, and the safety and reliability of the offshore wind turbine generator system are enhanced; and through an automatic time synchronization mechanism, the management and maintenance work of the offshore wind turbine generator system can be greatly simplified.

The application discloses a kind of synchronous satellite radar track initiation methods based on sky-wave gate correction, belong to the technical field of target tracking in radar data processing.This application is aimed at the problem of a large number of false tracks in track initiation in the target tracking of synchronous satellite radar.It includes establishing north-east sky right-angle coordinate system with sky-wave over-the-horizon radar receiving station as origin, determining the coordinates of synchronous satellite radar transmitting station, synchronous satellite radar receiving station and all measurement points in track initiation period;Determining the track tracking information of sky-wave over-the-horizon radar;According to the track information and state error of sky-wave over-the-horizon radar, establish the tracking gate of sky-wave over-the-horizon radar;Then, based on the traditional logical initiation method, establish the annular initiation gate of synchronous satellite radar;Finally, take the intersection of the annular gate of synchronous satellite radar and the tracking gate of sky-wave over-the-horizon radar as the correction gate of synchronous satellite radar, and perform track initiation, i.e.The starting track of synchronous satellite radar can be obtained.The application is suitable for track initiation in target tracking.

The invention provides an autonomous orbit determination method, device and equipment suitable for high-orbit satellite periodic maneuver error recovery and a medium, and the method comprises the steps: obtaining the priori clock correction information of an on-orbit service satellite, and employing polynomial fitting to forecast the clock correction of an observation time period through the priori clock correction information, and obtaining the clock correction forecast information; performing one-way observation on the on-orbit service satellite based on a one-way inter-satellite link established between the navigation satellite and the on-orbit service satellite to obtain observation data; the clock error forecast information and the observation data are analyzed, an initial speed error is determined, and the initial speed error is rapidly compressed; and under the condition that the initial speed error after compression meets a preset condition, switching the one-way inter-satellite link into a two-way inter-satellite link, so that the navigation satellite and the on-orbit service satellite carry out two-way observation to obtain a two-way observed quantity, and orbit determination is carried out on the on-orbit service satellite according to the two-way observed quantity.

The present application relates to the technical field of communications. Disclosed are communication methods, a satellite system, an electronic device and a storage medium. In a communication method disclosed in the present application, when a first server has received a domain name resolution request sent by a terminal device, if the first server stores a first IP address corresponding to a first domain name in the domain name resolution request, the first IP address can be directly returned to the terminal device; and when the first server does not store the first IP address corresponding to the first domain name, the domain name resolution request is forwarded to a local domain name server by means of a second server deployed in a geostationary earth orbit satellite, and the first IP address is acquired from the local domain name server by means of the second server. In this way, satellite communication resources can be effectively saved, and the situation of network access failure of a terminal device can be effectively reduced, thereby improving the user experience.

Disclosed embodiments relate satellites using a Software-Defined Radio (“SDR”) system. In one example, a geostationary (GEO) satellite includes an antenna system including multiple antennas, each configured to provide a spot beam having an adjustable throughput for a terrestrial coverage area while the antenna is in an active state and the satellite is in orbit above the Earth, a front-end subsystem communicatively coupled to the antenna system having an input side including an input filter and an analog-to-digital converter, and an output side including an output filter and a digital-to-analog converter, and a software defined radio (“SDR”) communicatively coupled to the antenna system via the front-end subsystem. The SDR, in response to a surge modification request, modifies a throughput of each active antenna by increasing or decreasing a share of a satellite power budget allotted to the antenna by deactivating or activating a previously active or previously inactive antenna, respectively.

Many satellites comprising a constellation are arranged in non-geosynchronous orbits (NGSO) forming a regular lattice arrangement in terms of right ascension ascending node (RAAN) and mean anomaly (M), with the orbital parameters specified by the position in the lattice. A set of satellites form a traffic lane having a nonzero RAAN / M slope. Lattice arrangements may be determined based on operational parameters such as antenna pattern beamwidth. The regular lattice may be configured such that adjacent satellites in each lane provide coverage for areas that are subject to interference exclusion limitations. For example, to prevent interference between an NGSO satellite and the geosynchronous satellite's service, the NGSO satellite is prohibited from transmitting towards a ground terminal that may be looking towards the geosynchronous satellite. The regular lattice may also be configured such that lanes in the regular lattice provide coverage for at least a portion of exclusion areas in adjacent lanes.

Provided are a method for sharing a radio spectrum with high-orbit communication satellites, which comprise a geosynchronous satellite and operate in a near-equatorial orbit, on the basis of a beam co

The invention belongs to the technical field of satellite image super-resolution, and discloses a geostationary satellite image super-resolution method and system based on a deep residual network, and the method comprises the following steps: obtaining geostationary satellite image data which comprises a plurality of low-resolution and high-resolution images of different wavebands; performing up-sampling on the low-resolution image to obtain the same size as the high-resolution image by using a bicubic interpolation method so as to match images with different resolutions; cascading the up-sampled low-resolution image and the up-sampled high-resolution image to serve as the input of a deep residual network; performing feature extraction on the cascading result by using a plurality of depth residual blocks so as to obtain deep features; and combining the extracted deep features with the up-sampled low-resolution image in a residual information mode to obtain a super-resolution image. According to the method, super-resolution of all low-resolution images is unified, the problem of non-uniform resolution of geostationary satellite image data is effectively solved, and the reliability and utilization rate of satellite data are improved.

A method performed by a ground station antenna system for tracking a non-Geo satellite. A signal is received from the satellite and a signal quality metric associated with the signal is estimated. A first tracking mode is selected and implemented when the estimated signal quality metric is below a threshold, in which the signal is demodulated to obtain demodulated signal quality metric (DSQM) estimates, and then a first tracking operation is performed to point an antenna beam at the satellite based on the DSQM estimates. A second tracking mode is selected and implemented when the estimated signal quality metric is above the threshold, in which signal strength estimates of the signal are obtained and then a second tracking operation is performed to point the antenna beam at the satellite based at least in part on the signal strength estimates.

A method for the transmission to at least one non-geostationary satellite of at least one piece of data stored by a ground-based device, the method being carried out by the non-geostationary satellite and including performing periodically at least one radio coverage measurement, computing a dynamic elevation emission criterion based on the last radio coverage measurement performed, emitting at least one signal periodically towards the Earth, the signal including at least the dynamic elevation emission criterion, if the position of the non-geostationary satellite relative to the position of the ground-based device verifies the dynamic elevation emission criterion: receiving at least one signal sent by the ground-based device, the signal including at least one piece of data stored by at least one ground-based device.

Techniques are described herein for non-terrestrial network (NTN) communications via one or more transparent-mode non-geosynchronous (NGSO) satellites. Embodiments extend a terrestrial wireless network (TWN), such as 5G NR, for use with the satellites. Analog feeder uplink and downlink waveforms are formatted to carry forward and return direct-to-device (DtD) signals over respective subchannel channels, and the subchannels can be assigned with time and frequency dimensions that are compatible with resource block assignments of the TWN protocols. Use of the analog subchannels and time-division multiplexing with beam-hopping facilitates satellite communication of the DtD signals effectively as an extension of the TWN. Embodiments also support communication of satellite control signals as part of the analog feeder uplink waveform, and inter-satellite link (ISL) routing and communication on-board the satellite.

The described geolocation techniques determine a location of an earth-based vehicle using a non-geostationary satellite. For instance, the non-geostationary satellite receives signals transmitted by the earth-based vehicle, determines the arrival times of the signals, and the position information of the satellite corresponding to the arrival times of the signals. The arrival times and position information of the satellite are sent to a signal processing unit to determine a location of the vehicle.

Techniques are described herein for non-terrestrial network (NTN) communications via one or more transparent-mode non-geosynchronous (NGSO) satellites. Embodiments extend a terrestrial wireless network (TWN), such as 5G NR, for use with the satellites. Analog feeder uplink and downlink waveforms are formatted to carry forward and return direct-to-device (DtD) signals over respective subchannel channels, and the subchannels can be assigned with time and frequency dimensions that are compatible with resource block assignments of the TWN protocols. Use of the analog subchannels and time-division multiplexing with beam-hopping facilitates satellite communication of the DtD signals effectively as an extension of the TWN. Embodiments also support communication of satellite control signals as part of the analog feeder uplink waveform, and inter-satellite link (ISL) routing and communication on-board the satellite.

The present invention provides an LDPC code timing decoding method and apparatus based on an unstable variable node maximum residual degree silent mechanism. The method includes: initializing messages and residual degrees, locating unstable variable nodes, selecting the maximum residual degree edges of unstable variable nodes, silencing the information update of these edges, transmitting the input information of the silent edges, transmitting the output information of the silent edges, updating the corresponding residual degrees, updating the set of unstable variable nodes, etc. Compared with the traditional IVC-RBP decoding method, the INP-VCRBP decoding method significantly improves the decoding performance while maintaining a low complexity, especially showing more prominent performance under low signal-to-noise ratio and low bit error rate requirements. Experimental results show that this decoding method can maintain good performance under different code lengths, has good practical application value, and can promote the application and development of LDPC codes in the fields of next-generation wireless communication, future geosynchronous satellite communication, etc.

The present application relates to the technical field of communications. Disclosed are communication methods, a satellite system, an electronic device and a storage medium. In a communication method disclosed in the present application, when a first server has received a domain name resolution request sent by a terminal device, if the first server stores a first IP address corresponding to a first domain name in the domain name resolution request, the first IP address can be directly returned to the terminal device; and when the first server does not store the first IP address corresponding to the first domain name, the domain name resolution request is forwarded to a local domain name server by means of a second server deployed in a geostationary earth orbit satellite, and the first IP address is acquired from the local domain name server by means of the second server. In this way, satellite communication resources can be effectively saved, and the situation of network access failure of a terminal device can be effectively reduced, thereby improving the user experience.