Methods and systems are described for providing end-to-end beamforming. For example, end-to-end beamforming systems include end-to-end relays and ground networks to provide communications to user terminals located in user beam coverage areas. The ground segment can include geographically distributed access nodes and a central processing system. Return uplink signals, transmitted from the user terminals, have multipath induced by a plurality of receive/transmit signal paths in the end to end relay and are relayed to the ground network. The ground network, using beamformers, recovers user data streams transmitted by the user terminals from return downlink signals. The ground network, using beamformers generates forward uplink signals from appropriately weighted combinations of user data streams that, after relay by the end-end-end relay, produce forward downlink signals that combine to form user beams.

Computer-implemented methods for securing data stored in a low earth orbit (LEO) data center are provided. Aspects include obtaining physical characteristics of a low earth orbit (LEO) data center and obtaining physical characteristics of one or more celestial objects. Aspects also include comparing the physical characteristics of the one or more celestial objects and the LEO data center. Based on a determination that the one or more celestial objects pose a risk to the LEO data center, aspects include backing up one or more data items stored on the LEO data center to another LEO data center in communication with the LEO data center.

A satellite is provided, including an onboard computing device. The onboard computing device may include a processor configured to receive training data while the satellite is in orbit. The processor may be further configured to perform training at a machine learning model based at least in part on the training data. The processor may be further configured to generate model update data that specifies a modification made to the machine learning model during the training. The processor may be further configured to transmit the model update data from the satellite to an additional computing device.

A method for piloting from bypass in a network based on a satellite load platform can unify the influence of distance change and Doppler frequency shift of satellite ground stations in the whole network, and realize accurate quasi synchronization between the clock of the whole network and the clock of the satellite. The method includes transmitting a pilot signal from bypass based on a satellite load platform in a satellite communication system, taking a spaceborne high stability timing clock source as a reference, and transmitting the pilot signal to all downlink beams to provide the pilot signal for all satellite stations covered by the satellite.

Various embodiments of systems, apparatus, and methods are described for assembling at least one transport stream from satellite transponder signals. In one example, the method includes capturing at least one satellite feed, the at least one satellite feed including a plurality of transponder signals; demodulating each of the plurality of transponder signals, each demodulated transponder signal corresponding to a transport stream including a plurality of input streams; parsing one or more selected streams from the plurality of input streams; assembling at least one new transport stream from the one or more selected streams; modulating the at least one new transport stream to generate at least one new transponder signal; adding the at least one new transponder signal to a channel stack; and transmitting the channel stack to a receiving device.

Methods and systems are described for providing end-to-end beamforming. For example, end-to-end beamforming systems include end-to-end relays and ground networks to provide communications to user terminals located in user beam coverage areas. The ground segment can include geographically distributed access nodes and a central processing system. Return uplink signals, transmitted from the user terminals, have multipath induced by a plurality of receive/transmit signal paths in the end to end relay and are relayed to the ground network. The ground network, using beamformers, recovers user data streams transmitted by the user terminals from return downlink signals. The ground network, using beamformers generates forward uplink signals from appropriately weighted combinations of user data streams that, after relay by the end-end-end relay, produce forward downlink signals that combine to form user beams.

A system for communication via satellite between a gateway and a plurality of terminals comprises: a controller device to calculate a time-frequency plan of burst signals from a terminal and to transmit, based on the time-frequency plan, to the terminal information including configuration information on transmit burst signals; a multi-carrier demodulator structure arranged to receive a resulting signal comprising receive signals and arranged to receive information for the receive signals. The multi-carrier demodulator structure has multi-carrier demodulator devices, each with a channelizer to serialize the receive signals, yielding a serialized stream of sample segments corresponding to the receive signals, a processing block to receive that stream of sample segments and to perform demodulation of the sample segments based on the sample segment content, on a state indicative of the receive signal to which the sample segment belongs and on said receive information, pre-FEC word aggregation, demapping and decoding.

Techniques for improving data rates at mobile terminals that are subject to periodic channel interruptions in a beyond-line-of-sight communication system are disclosed, including improved encoding and decoding systems that identify blockages and modify receiver operation during blockages to reduce data errors. In certain embodiments, encoding, symbol mapping, interleaving, and use of unique periodic identifiers function to enable a series of packets that may be received in a blockage impaired channel with reduced errors.

A method for communication between a ground terminal on the earth's surface and a satellite, wherein the ground terminal and a radio terminal of the satellite are set up for IP-based communication. The communication proceeds such that one or more IP-based protocols are used with the interposition of a space-based Internet system to transmit control commands for one or more modules of the satellite from the ground terminal to the radio terminal, which receives the control commands by radio from the space-based Internet system and forwards them to the module(s). Alternatively or additionally, module data, which come from one or more modules of the satellite, are transmitted from the radio terminal to the ground terminal, with the radio terminal sending the module data by radio to the space-based Internet system.

A computing device including a processor configured to receive satellite status data from satellites included in a satellite constellation. The processor is further configured to determine a link topology of the satellites. Based at least in part on the satellite status data and the link topology, the processor is further configured to identify a first satellite constellation subset including one or more selected satellite pairs. Identifying the one or more selected satellite pairs includes computing respective link utility values associated with a plurality of candidate pairs of satellites included in the satellite constellation based at least in part on the satellite status data and the link topology. The one or more selected satellite pairs are selected based at least in part on the link utility values. The processor is further configured to transmit, to the satellites included in the first satellite constellation subset, instructions to perform intersatellite imaging data transfer.