Systems and methods are disclosed herein for adaptively coordinating among satellite communication channels. A method, according to an example implementation of the disclosed technology, can include: receiving, at a radio frequency receiver disposed on a target satellite, a plurality of signals associated with a corresponding plurality of candidate satellite communication channels; detecting, among the plurality of signals, a command structure; selecting, for communications with a first ground station, a first channel of the candidate satellite communication channels, based at least in part, on information in the detected command structure; establishing a communication link with the first ground station using the first channel; receiving, via the first channel, and from the first ground station, one or more downlink instructions; selecting a downlink communication channel based on the received one or more downlink instructions; and transmitting information to the first ground station via the selected downlink communication channel.

According to one embodiment, a satellite communication apparatus includes a first unit including a power supply unit configured to supply a power source and a first motor configured to rotate a supporting column in a horizontal direction, a motor unit including a second motor configured to control an elevation angle of the supporting column with respect to the first unit, and a second unit supported by the supporting column and including a third motor configured to adjust a polarization angle of an antenna, a magnetic sensor arranged to be less susceptible to a magnetic field of the third motor, and a control device to control the first motor or the second motor before calibration of the magnetic sensor.

A transmitter is set to time division multiple access (TDMA) mode and allocated a first TDMA channel. In the TDMA mode, the additional TDMA channels are allocated to and deallocated from the transmitter, according a traffic demand at the transmitter, until all TDMA channels are assigned and the traffic demand reaches a threshold, whereupon the transmitter is switched to a frequency division multiple access (FDMA) mode, and assigned an FDMA channel. In response to traffic levels, the transmitter is switched to larger bandwidth FDMA channels and, optionally, to a concurrent FDMA-TDMA mode having a large bandwidth FDMA channel in addition to a number of TDMA channels. Optionally, switching the transmitter among TDMA mode, FDMA mode, and concurrent FDMA-TDMA mode is based, at least in part, on QoS, or time of day, or user statistics, or combinations thereof.

An adjustable payload for small geostationary communication satellites is disclosed. In an example, a communication satellite includes a payload system having a software defined payload that is configured to provide communication services. The software defined payload includes a processor for providing at least one of gain control per transponder and carrier/sub-channel, channelization, channel routing, signal conditioning or equalization, spectrum analysis, interference detection, regenerative or modem processing, bandwidth flexibility, digital beamforming, digital pre-distortion or power amplifier linearization, for at least one user slice for a plurality of user terminals and at least one gateway slice for a gateway station. The software defined payload also includes an input side and an output side for each slice. Each input side includes an input filter and an analog-to-digital converter and each output side includes an output filter and a digital-to-analog converter. The payload system also includes antennas communicatively coupled to the software defined payload.

A method for a hitless handover in a hitless handover of communications in a Radio Frequency (RF) network is disclosed. The method including: providing a terminal comprising a first demodulator, a second demodulator and a phased array antenna; receiving communications via a first outroute signal in a first coverage area with the phased array antenna over a first outroute and processed by the first demodulator; transmitting a first inroute signal in the first coverage area with the phased array antenna over a first inroute; determining that the first outroute is setting when the terminal is imminently leaving the first coverage area and that a second outroute is rising when the terminal is entering a second coverage area; acquiring a second outroute signal in a second coverage area with the phased array antenna over the second outroute and processed by the second demodulator; sending a request to receive the communications over the second outroute, while the terminal is disposed in an overlap of the first coverage area and the second coverage area; establishing communications via the second outroute; and handing over communications from the first outroute to the second outroute while the terminal is disposed in the overlap, where the communications are received by the terminal without interruption, without a pause and without replication over the first outroute and the second outroute.

A device and method are described for duplex satellite communication over a single satellite antenna. A satellite ground terminal may utilize a frequency-selective surface module including a frequency-selective surface as a subreflector acting as a frequency diplexer to separate signals received and/or transmitted by a first feed and a second feed of a satellite ground terminal, where each feed has a separate antenna horn. The frequency-selective surface module may be used in combination with a second subreflector such that a first feed and a second feed of the satellite ground terminal are implemented on the same side of the frequency-selective surface module.

Telemedicine systems and methods are described. In a telemedicine system operable to communicate with a remote operations center, communications can be transmitted/received using a transceiver having an antenna. The antenna can include first and second di-pole antenna elements, the first di-pole antenna element being vertically polarized and the second di-pole antenna element being horizontally polarized. A controller of the system can establish, using the transceiver, a telemedicine session with the operations center using a Transport Morphing Protocol (TMP), the TMP being an acknowledgement-based user datagram protocol. The controller can also mask one or more transient network degradations to increase resiliency of the telemedicine session. The telemedicine system can include a 2D and 3D carotid Doppler and transcranial Doppler and/or other diagnostic devices, and provides for real-time connectivity and communication between medical personnel in an emergency vehicle and a receiving hospital for immediate diagnosis and treatment to a patient in need.

Systems and method are disclosed and among these is a method for mitigation of interference local to remote terminals, and it can include detecting reception of a packet having one of the remote terminals as a destination terminal and, in response, selecting a sub-carrier among the sub-carriers that are not identified as receiving local interference at the destination terminal, and loading, into a queue for the selected sub-carrier, a coded data from which a content of the packet can be derived, and transmitting the queued coded data on the selected sub-carrier. Among disclosed features is a receiving of an interference report that carries an information indicative of a new local interference and, in response, updating the data identifying sub-carriers having local interference at the destination terminal.

A system for transmitting signals includes processing circuitry for receiving at least one input signal for transmission from the processing circuitry to a second location. Electromagnetic knot processing circuitry receives processed signals from the first processing circuitry and applies an electromagnetic knot to the received processed signal before transmission to the second location. A first signal degradation caused by environmental factors of the electromagnetic knot processed signal is improved over a second signal degradation caused by the environmental factors of a non-electromagnetic knot processed signal.

A method for using multiple communication paths in a satellite network is disclosed. The method including: initiating a connection request from a first peer to a second peer; providing communication paths between the first peer and the second peer; retrieving a policy corresponding to the communication paths, the first peer and the second peer; receiving a transport metric for at least one of the communication paths; selecting a path from the communication paths based on a connection metric, the transport metric and the policy; and establishing a connection between the first peer and the second peer with the path, wherein at least one of the communication paths is relayed by a satellite.