29 results about "Geosynchronous orbit" patented technology

Systems and methods are described for connecting with LEO satellites while reducing emissions toward GEO satellite communications. A system to implement the instant techniques may include a system comprised of a user communications equipment and a LEO constellation. The user equipment (“UE”) may comprise a communications modem and an active antenna unit with a transmit and receive beamformer. In further implementations, the UE may include additional receive only beamformers. The LEO constellation can have a regenerative payload or bent pipe, and can include orbits at different altitudes. Methods as described herein may include a procedure by which the user equipment and LEO satellite work together to identify candidate serving satellites, and select the one that allows to meet the power density requirements to avoid interfering with the GEO satellites.

Various solutions for connected mode measurement enhancements in global navigation satellite system (GNSS) operations are described. A device can connect to a serving cell associated with a first non-geosynchronous orbit (NGSO) satellite to operate in a connected mode. The device can also receive, from the serving cell, a configuration of one or more neighboring cells associated with a second NGSO satellite. The serving cell and the one or more neighboring cells operate within a same frequency band. The device can then perform, based on the configuration, inter-frequency measurements of the one or more neighboring cells if at least one condition is satisfied.

The invention relates to a load balancing method and device based on a space-ground integrated core network, and communication equipment. Wherein a data plane satellite-borne network element is newly added to each network node of the space-ground integrated core network, and the space-ground integrated core network is used for parallel transmission of a control plane link and a data plane link in an inter-satellite link based on a service interface (SBI) / data transmission interface (DTI) dual-bus link. The method comprises the following steps: a first network node receives a user task, wherein the user task is a task which is unloaded to a space-based network for execution after a ground data network performs a load balancing decision; the first network node makes a load balancing decision according to the geosynchronous orbit GEO node state information to obtain a first GEO node, and the first GEO node is used for executing a load balancing strategy to send a user task to a corresponding low earth orbit LEO node through an inter-satellite link for data processing. According to the invention, the average processing time delay of user tasks can be reduced.

The application discloses a GEO SAR time-varying ionosphere error compensation method based on maximum contrast self-focusing, and belongs to the technical field of GEO SAR (Geosynchronous Earth Orbit Synthetic Aperture Radar). The method selects distance line signals from a GEO SAR image, the distance line signals are the signals with the same distance time in the azimuth direction, the average power of each distance line signal in the image is calculated, a part of the distance line signals are selected, then the contrast of the SAR image is used to iteratively estimate the quadratic phase error coefficient, the cubic phase error coefficient is iteratively estimated based on the quadratic phase error coefficient, and finally the obtained quadratic and cubic phase error coefficients are used for phase compensation of the original SAR image, so that the SAR image affected by the time-varying ionosphere is accurately compensated. Experiments prove that the contrast of the compensated SAR image is improved by the method, and the compensated image is good, and is close to the image not affected by the time-varying ionosphere.

The invention relates to the technical field of spacecraft control, and provides a spacecraft rendezvous control method based on a disturbance observer and related equipment, and the method comprises the steps: constructing a kinetic model of orbit rendezvous of a target spacecraft at an earth-moon translation point, and designing the disturbance observer based on the kinetic model; defining a cost function based on the system state quantity of the target spacecraft, and constructing an action controller of the target spacecraft according to the cost function; calculating a control interference estimated value of the target spacecraft according to the interference observer, and calculating an optimal control value according to the action controller; and calculating a final control value of the target spacecraft based on the control interference estimated value and the optimal control value, and performing orbit intersection control on the target spacecraft based on the final control value. According to the method, the spacecraft rendezvous control precision can be improved.

The application relates to the technical field of satellite communication, in particular to a satellite communication terminal crystal oscillator calibration method, which comprises the following steps: triggering a crystal oscillator calibration process when a terminal is started or in a communication idle period; tuning the terminal to the frequency point of a geosynchronous orbit satellite, searching for and capturing the synchronization signal of the geosynchronous orbit satellite; performing correlation operation on the received synchronization signal and a reference signal generated by a local crystal oscillator of the terminal, and calculating the frequency deviation value between the synchronization signal and the reference signal; and generating a crystal oscillator control signal according to the frequency deviation value, and finely adjusting the frequency of the local crystal oscillator. The application realizes accurate, robust and verifiable calibration of the terminal crystal oscillator without an external high-precision reference source.

The application relates to the technical field of spacecraft control, and provides a spacecraft rendezvous control method based on an interference observer and related equipment, the method comprising the following steps: constructing a dynamic model of target spacecraft rendezvous on a geosynchronous orbit, and designing an interference observer based on the dynamic model; defining a cost function based on system state quantities of the target spacecraft, and constructing an action controller of the target spacecraft according to the cost function; calculating a control interference estimation value of the target spacecraft according to the interference observer, and calculating an optimal control value according to the action controller; calculating a final control value of the target spacecraft based on the control interference estimation value and the optimal control value, and performing orbit rendezvous control on the target spacecraft based on the final control value. The method can improve the precision of spacecraft rendezvous control.

The application provides a precipitation prediction method and device, electronic equipment and storage medium, the method comprises the following steps: obtaining a plurality of frequency polarization channel brightness temperature data and infrared channel brightness temperature data of a target area based on a polar orbit satellite and a geosynchronous orbit satellite; determining whether a target area has a precipitation event according to the obtained data; if so, filtering the target frequency polarization channel brightness temperature data according to the sea-land classification result of the target area; determining the precipitation prediction result of the target area according to the target frequency polarization channel brightness temperature data and the infrared channel brightness temperature data. By combining the meteorological monitoring data of the polar orbit satellite and the geosynchronous orbit satellite, the temporal and spatial resolution of the meteorological monitoring data is improved, and the passive microwave data, infrared data including water vapor channel data are integrated, thereby improving the accuracy of the precipitation prediction.

Techniques are described for automated satellite power management (ASPM) for a satellite communication system having a constellation of non-geosynchronous orbit (NGSO) small satellites (smallsats). The techniques can be resource- and / or mission-aware. Embodiments control power used by the constellation by evaluating subsets of the NGSO smallsats determined to be covering each of a number of grid regions (GRs) segmenting a coverage area at any particular timestep. For each timestep for each subset, the evaluating includes: determining whether any payloads of the subset are mutable payloads for the timestep (i.e., can be shut down to conserve power without violating mission objectives); and communicating with the subset to control power to the payloads, so that all the mutable payloads are muted for the timestep and all other payloads of the plurality of payloads are unmuted for the timestep.

The present invention relates to the field of communications, and provides a data communication method and system and an electronic device. The method comprises: by means of a pre-constructed satellite data warehouse, receiving data name information uploaded by a producer, the satellite data warehouse comprising at least three geosynchronous orbit satellites and a plurality of low earth orbit satellites, and the data name information representing the position of the moved producer; and, on the basis of the data name information, updating data in the satellite data warehouse. The present invention solves the defect in NDN network architecture that after producers have moved, it is difficult for consumers to determine new positions of the producers and thus sent packets of interest will reach old positions of the producers, such that the packets are lost, greatly affecting the accuracy and efficiency of data transmission. The solution of the present application can buffer data packets of moved producers in pre-constructed satellite data warehouses, thereby effectively avoiding effects on network performance caused by movement of the producers.

The present disclosure relates to the field of communication and provides a method, a system and an electronic device of date communication. The method includes: the data name information uploaded by the producer is received through the pre-built satellite data depot, which includes at least three geosynchronous earth orbit satellites and several low-orbit satellites, and the data name information characterizes the data characterized by the producer; and the data in the satellite data depot is updated based on the data name information. In order to solve the defect that if a producer moves in an NDN network architecture, a consumer is difficult to locate a new position of the producer, so that a sent interest packet reaches an old position of the producer, and the packet is lost, which greatly affects the accuracy and efficiency of data transmission, the data packet of the moving producer can be cached in the data depot based on the pre-built satellite data depot in the solution of the present application, so that the influence of the movement of the producer on the network performance can be effectively shielded.

The application provides a photometric curve anomaly detection method based on a long short-term memory network and relates to the technical field of intelligent perception of space targets. In view of the problems of dependence on labeled data, noise sensitivity and insufficient local anomaly capturing capacity in the prior art, a high-precision anomaly recognition is realized through the construction of an unsupervised learning framework. The long short-term memory network is used for modeling the time sequence dependence relationship, and a time attention mechanism is introduced to dynamically focus on key time steps, so that the anomaly detection precision of the model is improved. The application provides an efficient solution for space target abnormality perception and is suitable for real-time monitoring of complex scenes such as geosynchronous orbits and earth-moon space.

Disclosed methods and apparatuses involve the coordinated use of two or more satellites operating in inclined orbits, with a defined phase offset in terms of their latitudinal oscillations above and below the geosynchronous arc.

The invention discloses an on-orbit field-free calibration method for a high-orbit linear array optical remote sensor, solves the key problem of on-orbit high-precision radiometric calibration of a geosynchronous orbit linear array optical satellite so as to eliminate stripe noise caused by inconsistent response of detector pixels, and belongs to the technical field of remote sensing data application. The calibration method comprises the following steps: setting imaging parameters of a linear array optical remote sensor carried by a high-orbit satellite; selecting a calibration scene; according to the calibration scene, the optical axis direction of the linear array optical remote sensor and the pixel distribution characteristics of an image plane detector of the linear array optical remote sensor, setting a satellite attitude, and enabling each pixel of the linear array optical remote sensor to sequentially image the same object point on the ground; and calculating a relative radiometric calibration coefficient according to the acquired image. According to the invention, the completely equal ground feature radiance is obtained for radiometric calibration, and the high relative radiation precision of the high-orbit satellite is ensured.

The invention discloses a transfer orbit design method in on-orbit service of a synchronous orbit satellite. The problem of how to effectively image a high-orbit target satellite with low fuel consumption is solved. Belongs to the technical field of space. Comprising the following steps: determining total transfer time according to different initial states of a service satellite and a target satellite; constructing a transfer orbit mathematical model based on the total transfer time to obtain the running time of the service satellite on the initial orbit, the transfer orbit and the approaching orbit in the transfer process and the speed increment for completing the Horman transfer; taking a relative position vector included angle and an illumination angle of two stars at the end of intersection as an objective function, taking total transfer time as a constraint condition, taking the operation time of a service star in an initial orbit and an approaching orbit as an optimization variable, optimizing the objective function by using a genetic algorithm based on an HPOP model, and correcting parameters of a transfer orbit mathematical model to obtain a transfer orbit mathematical model; obtaining a transfer orbit mathematical optimization model; according to the method, effective imaging of the high-orbit target with low burnup is realized through the mathematical optimization model of the transfer orbit.

The invention discloses an XY seat frame antenna gain test method and related equipment. The method comprises the following steps: selecting any geosynchronous orbit satellite in the field of view of an antenna as a beacon source, and enabling the optical axis of the antenna to point to the geosynchronous orbit satellite; reading and recording the rotation angle of the X-axis motor and the rotation angle of the Y-axis motor at the moment when the peak searching of the signal level received by the frequency spectrograph reaches the maximum value, and taking the rotation angle of the Y-axis motor as a projection deflection angle; under the condition that the projection deflection angle is kept unchanged, single-degree-of-freedom scanning is executed to obtain the angle difference of the relative accurate star pointing positions of the X-axis motor and the Y-axis motor; and constructing a space geometric projection relation based on the projection deflection angle, executing space projection correction on the obtained angle difference of the X-axis motor, and calculating a real antenna beam width in combination with the angle difference of the Y-axis motor so as to carry out gain test. The problem that the antenna gain test is inaccurate due to the fact that physical alignment is tedious and an AZ-EL correction formula is misused in the existing test can be solved.

A satellite system may have a constellation of communications satellites in orbits such as highly inclined eccentric geosynchronous orbits and low earth orbits. Satellite terminals may be used to communicate with the satellite constellation. The satellite terminals may have control circuitry that dynamically adjusts phased antenna array circuitry to steer antenna beams towards one or more satellites. Multiple antenna beams may be steered in different directions simultaneously. A satellite terminal may be used in simultaneously transmitting and receiving data from different respective satellites and may be used in transmitting and receiving satellite signals in multiple satellite bands. The satellite terminal may have an outdoor unit that is coupled to an indoor unit over a digital communications path. The outdoor unit may include the phased antenna array circuitry and transceiver and modem circuitry, whereas the indoor unit may cache media and serve as a firewall, router, and wireless access point.

The invention provides an adjacent geosynchronous orbit satellite false-tracking prevention implementation method for a multi-beam antenna, aiming at the characteristic that a plurality of sets of independent feed source units in a bifocus multi-beam antenna are mounted on a feed source orbit through a movable pulley, a high-precision magnetic grid ruler is mounted along the feed source orbit, and a magnetic grid reading head is mounted on the feed source pulley; measuring the absolute position of the feed source pulley on the feed source track; according to the information of the to-be-tracked satellite, the theoretical position of the feed source unit corresponding to the to-be-tracked satellite on the feed source orbit is determined; according to the absolute position and the theoretical position, after the feed source unit is controlled to move to the theoretical position, the AGC level is used for finally determining the position of the feed source unit, and accurate tracking of the satellite to be tracked is achieved.

The application discloses a method and system for searching geosynchronous orbit satellite, wherein the method comprises the following steps: calculating the theoretical position of antenna pointing based on the nominal position of the launched satellite, wherein the launched satellite is a geosynchronous orbit satellite; setting the step distance and the step number in advance, and scanning and searching according to the equidistance spiral involute expansion, wherein the first sidelobe signal of the launched satellite is identified in one scanning, and the main lobe satellite signal is identified by performing secondary scanning based on the first sidelobe position, so as to locate the launched satellite. The method for searching geosynchronous orbit satellite provided by the application has high searching efficiency, and the main lobe can be quickly found by performing secondary scanning based on the position of the first sidelobe in scanning, without performing large range searching, so that the searching time is saved and the searching efficiency is improved.

The invention relates to a ship full-route satellite communication method and system and a storage medium, which are applied to a ship carrying two or more VSAT terminals, and each VSAT terminal is in one-to-one communication connection with each geosphere synchronous orbit satellite to form different communication links. The method comprises the following steps: collecting signal condition indexes of each VSAT terminal, wherein the signal condition indexes comprise a carrier-to-noise ratio, a carrier-to-noise ratio density, a packet loss rate and a pitch angle of the VSAT terminal; for each VSAT terminal, respectively judging whether each signal condition index meets a corresponding threshold condition, and generating a link degradation score of each VSAT terminal according to the number of the indexes meeting the threshold condition; wherein the higher the link degradation score is, the lower the corresponding communication quality is; and determining whether to execute link switching according to the link degradation scores of the main VSAT terminal and the standby VSAT terminal. The problem of switching missing in a traditional scheme is solved, and the stability of a ship full-course satellite communication link is improved.

The invention provides a data transmission method, which is applied to a core network element, the core network element is deployed in a target near earth orbit LEO satellite, and the method comprises the following steps: under the condition that the target LEO satellite leaves a first service area, sending first target data to a data center in a geosynchronous orbit GEO satellite, sending the first target data to a data center, so that the data center synchronizes the first target data to core network elements in other LEO satellites under the condition that the other LEO satellites except the target LEO satellite enter a first service area; wherein the first target data is service data transmitted after first user equipment (UE) in the first service area accesses a core network element in the target LEO satellite. The invention further provides a data transmission method applied to the data center, network element equipment, data center equipment and a computer readable medium.

Techniques are described for automated satellite power management (ASPM) for a satellite communication system having a constellation of non-geosynchronous orbit (NGSO) small satellites (smallsats). The techniques can be resource-and / or mission-aware. Embodiments control power used by the constellation by evaluating subsets of the NGSO smallsats determined to be covering each of a number of grid regions (GRs) segmenting a coverage area at any particular timestep. For each timestep for each subset, the evaluating includes: determining whether any payloads of the subset are mutable payloads for the timestep (i.e., can be shut down to conserve power without violating mission objectives); and communicating with the subset to control power to the payloads, so that all the mutable payloads are muted for the timestep and all other payloads of the plurality of payloads are unmuted for the timestep.

This invention discloses a simplified deterministic handover method, system, and apparatus suitable for GEO satellite communication. Addressing the problem of time slot counter loopback caused by the long propagation delay of geostationary orbit (GEO) satellites, this invention introduces absolute timestamp extension based on a simplified scheme based on physical time slot counter degradation. The source base station carries the absolute time and the predicted target cell linear time slot number (next_slot) in the handover command and synchronously notifies the target base station. The UE and the target base station independently increment the count using next_slot as the synchronization anchor point. After tuning, the UE calculates the downlink resource position based on the current linear time slot counter at each time slot boundary and periodically listens for implicit grants. When multiple UEs collide, the target base station selects a winner according to deterministic rules and sends grants only on the winner's downlink resources; the unwinners continue listening, with the worst-case number of listening time slots not exceeding M-1. This invention enables the simplified scheme to support GEO scenarios while maintaining the advantages of low complexity, pure software upgrades, and zero RACH signaling, with a deterministic upper bound on the handover execution interruption time. The technical solution of this invention is also applicable to low Earth orbit (LEO) satellites and terrestrial cellular networks.

The invention discloses an encryption authentication signaling merging method and device and electronic equipment. The method comprises the following steps: in the process of updating the position of a geosynchronous orbit mobile radio interface (GMR), sending an authentication request message to a terminal side, the authentication request message comprising an encryption mode command message, and sending the encryption mode command message to the terminal side; the encryption mode command message comprises at least one of an encryption algorithm selection parameter, an encryption starting parameter and a terminal equipment identifier query parameter; receiving an authentication response message corresponding to the authentication request message returned by the terminal side, the authentication response message including an encryption mode completion message corresponding to the encryption mode command message; and performing authentication and encryption configuration according to the authentication response message. According to the method and the device, the technical problems of large signaling quantity, large resource consumption and relatively long delay caused by independent interaction of an encryption mode command / completion message and an authentication request / response message in a position updating process of a GMR system in related technologies are solved.

A satellite system may have a constellation of communications satellites in orbits such as highly inclined eccentric geosynchronous orbits and low earth orbits. Satellite terminals may be used to communicate with the satellite constellation. The satellite terminals may have control circuitry that dynamically adjusts phased antenna array circuitry to steer antenna beams towards one or more satellites. Multiple antenna beams may be steered in different directions simultaneously. A satellite terminal may be used in simultaneously transmitting and receiving data from different respective satellites and may be used in transmitting and receiving satellite signals in multiple satellite bands. The satellite terminal may have an outdoor unit that is coupled to an indoor unit over a digital communications path. The outdoor unit may include the phased antenna array circuitry and transceiver and modem circuitry, whereas the indoor unit may cache media and serve as a firewall, router, and wireless access point.

This invention belongs to the field of synthetic aperture radar (SAR) technology, and particularly relates to a distributed intelligent inversion method for three-dimensional deformation of SAR in geostationary orbit. In this method, the generator uses a VUR-net unwrapped network with good phase-preserving properties, and the discriminator uses a Markov discriminator model (PatchGAN), which can solve the problem that traditional deep learning networks do not care about accuracy preservation. To prevent network structure collapse, a pseudo-cyclic consistency loss function is added. Since the data obtained directly is usually entangled, the designed deep learning network has the nonlinear mapping capability of unwrapping; to enhance the network's phase unwrapping capability, a phase unwrapping loss function is introduced.

Disclosed in the embodiments of the present application are a communication method, a communication apparatus, and a storage medium, which are applied to the technical field of communications, and are used for implementing spectrum detection and interference management in an NGSO (Non-Geosynchronous Orbit) system. The method in the embodiments of the present application comprises: sending first information, wherein the first information is used by a first terminal device to execute spectrum detection, and the first terminal device is served by a first NGSO satellite; and receiving second information, wherein the second information is obtained by means of the first terminal device by executing spectrum detection, and the second information is used by the first NGSO satellite to determine a transmission state. By means of indicating the first information, the first terminal device can perform spectrum detection on the basis of the first information, and can obtain a corresponding spectrum detection result on the basis of the requirements of the first NGSO satellite, thereby implementing spectrum detection of a downlink in the NGSO system. Since the second information is used by the first NGSO satellite to determine the transmission state, the first NSGO satellite can be prevented from interfering with a downlink in a GSO system by means of adjusting the transmission state, thereby implementing interference management.

The present disclosure relates to a pre-5th-Generation (5G) or 5G communication system to be provided for supporting higher data rates Beyond 4th-Generation (4G) communication system such as Long Term Evolution (LTE). A method by which an access network (AN) node of a wireless communication system manages a session by using backhaul information, according to one embodiment of the present disclosure, may comprise the steps of: selecting an access and mobility management function (AMF) when a registration request message is received from a user equipment (UE); selecting one transport network layer association (TNLA) from among candidate TNLAs for the selected AMF by considering the type of backhaul network of a control plane; transmitting an initial UE message to the selected AMF by using the selected TNLA; and performing a registration procedure of the UE when a selected TNLA response signal is received from the selected AMF, wherein the candidate TNLA can include a low earth orbit (LEO) and / or a geosynchronous earth orbit (GEP).

The application discloses a space-air-ground integrated network content caching method and system, which comprises the following steps: establishing a network model, constructing a ground and sky wireless communication model on the network model; a user in the network model initiates a content request to a terminal based on the communication model, and the terminal requests the content from a nearest available edge caching node; the edge caching node checks whether the local caching database contains the content, if the local database contains the content, the content is directly delivered to the user terminal; if the local database does not contain the content, a deep reinforcement learning method based on a DQN algorithm framework is used to update the local caching content, and the caching hit rate is calculated. The application uses the space-air-ground integrated network to cache the content, and has the advantages that the space-air-ground integrated network has a larger coverage range than a traditional ground cellular network, wherein an aerial network composed of unmanned aerial vehicles and geosynchronous orbit satellites and the like provides a flexible network access method for ground equipment, and can meet the individualized needs of users.