The present disclosure provides example satellite communication method, terminal device, and computer-readable storage medium. One example method includes receiving a first system message sent by a first satellite, where the first system message indicates a mean anomaly of the first satellite at an ephemeris reference time. A topology of a satellite network to which the first satellite belongs is determined based on the first system message.

A closed-loop motion monitoring and control system for structural mode control in a large, flexible space structure. The system uses combined sensor data to detect low-magnitude, low-frequency motion, estimate structure deformation constants, and damp structural vibrations with electromagnetic torque application.

Systems and methods for operating a multi-band satellite terminal are disclosed. One aspect disclosed features a method, comprising: controlling a multi-band satellite terminal capable of receiving signals on a plurality of frequency bands to receive a signal transmitted by a satellite on a first frequency band of the plurality of frequency bands; determining link conditions of the first frequency band based on the received signal; generating an estimate of link conditions of a second frequency band of the plurality of frequency bands, wherein the estimate is generated based on the link conditions of the first frequency band; selecting the second frequency band based on the estimate of the link conditions of the second frequency band; and controlling the multi-band satellite ground terminal to receive the signal transmitted by the satellite on the second frequency band.

Provided is a control device that controls flight vehicles having an antenna for forming a cell on the ground to provide a wireless communication service to a user terminal in the cell. The control device includes a replacement control unit that controls replacement of a first flight vehicle covering an object area on the ground by means of a cell with a second flight vehicle. The replacement control unit controls the first flight vehicle and the second flight vehicle such that the second flight vehicle moves to a location corresponding to the location of the first flight vehicle, the second flight vehicle and the first flight vehicle start providing a wireless communication service to a user terminal by Coordinated Multiple Point transmission/reception (CoMP), and then the first flight vehicle stops forming its cell.

A satellite system operates at altitudes between 100 and 350 km relying on vehicles including a self-sustaining ion engine to counteract atmospheric drag to maintain near-constant orbit dynamics. The system operates at altitudes that are substantially lower than traditional satellites, reducing size, weight and cost of the vehicles and their constituent subsystems such as optical imagers, radars, and radio links. The system can include a large number of lower cost, mass, and altitude vehicles, enabling revisit times substantially shorter than previous satellite systems. The vehicles spend their orbit at low altitude, high atmospheric density conditions that have heretofore been virtually impossible to consider for stable orbits. Short revisit times at low altitudes enable near-real time imaging at high resolution and low cost. At such altitudes, the system has no impact on space junk issues of traditional LEO orbits, and is self-cleaning in that space junk or disabled craft will de-orbit.

Apparatus and methods are provided for determining epoch time in an NTN system resolving the SFN wrapping issue. In one novel aspect, the UE obtains epoch time information, determines the epoch-time SFN by selecting one SFN instance with the SFN value indicated in the epoch time information based on one or more epoch-time rules, wherein the epoch-time rules resolve epoch-time SFN ambiguity indicated by the received epoch time information, and derives the epoch time based on the determined epoch-time SFN. In one embodiment, the epoch-time SFN is determined based on the receiving-SFN/SIBx and the SFN value of the epoch-time. The epoch-time SFN is a current or next upcoming SFN with the epoch-time SFN value after the receiving-SFN. The epoch-time SFN is a nearest SFN to the receiving-SFN with the epoch-time SFN value.

A high data rate signal combiner (HDRSC), including: a first analog to digital converter (ADC) configured to convert a first radio frequency (RF) signal from a first antenna into a first digital signal; a second ADC configured to convert a second RF signal from a second antenna into a second digital signal; a first circular buffer configured to store the first digital signal from the first ADC; a second circular buffer configured to store the second digital signal from the second ADC; a cross-correlator configured to cross correlate the first digital signal and the second digital signal; a lag peak search circuit configured to determine the location of a peak in the output of the cross-correlator; a vector adder circuit configured to combine the first digital signal and the second digital signal with a delay on one of the first signal and the second digital signal based upon the location of the peak in the output of the cross-correlator; and a digital to analog converter (DAC) configured to convert the combined digital signal into an analog signal.

A system for satellite communication is disclosed. The system includes a base terminal and a mobile terminal configured to communicate via a communication satellite relay. The base terminal and the mobile terminal include a receiver and a transmitter. At least one of the base terminal or the mobile terminal further includes an artificial intelligence engine configured to receive status or instruction data based on a received signal, determine an instruction or command based on the received data, prepare instruction data or updated status data, and send an instruction signal or status signal based on the instruction data or updated status data. The artificial intelligence engine utilizes a machine learning model and may generate the machine learning model.

A satellite communication system includes satellite nodes moving in respective known orbits, and a controller configured to determine routing neighborhoods for each satellite node based upon the known orbits, each routing neighborhood comprising a group of adjacent satellite nodes; and assign a respective primary neighborhood egress node (NEN) from among the plurality of satellite nodes for each routing neighborhood. A given satellite node of a given satellite node routing neighborhood may be configured to reroute a failed path from a source satellite node to a destination satellite node through the given satellite neighborhood using a secondary NEN instead of a respective primary NEN.

Methods, systems, and apparatus, including computer programs encoded on computer-storage media, for ground system techniques to support flexible reconfigurable satellite payload operation. In some implementations, a satellite communication network is managed to operate in a first configuration. The satellite communication network includes a satellite having a payload that enables dynamic reconfiguration of carriers within a beam. A reconfiguration event is detected, and in response, a second configuration is determined for the satellite communication network. The second configuration differs from the first configuration in at least one of a set of carriers used for the beams or an assignment of the carriers to gateways. The satellite network is managed to operate in the second configuration, including at least one of (i) changing to a second set of carriers for the beams of the satellite or (ii) changing to a second assignment of the carriers to the gateways.