An aircraft satellite communications system is provided. The aircraft satellite communications system may include a receiver/transmitter system configured for transmitting and receiving data from a low earth orbit satellite. The low earth orbit satellite is in communication with a host. The low earth orbit satellite is configured for receiving a request from the receiver/transmitter system and communicating the request to the host. The aircraft satellite communications system also includes a receiver configured for receiving data from a geostationary orbit satellite. The geostationary orbit satellite is also in communication with the host and is configured to receive a response to the request from the host and to transmit the response to the receiver.

Techniques for controlling communication amongst a group of vehicles include determining whether a cellular network is unavailable or a user input indicative of a switchover request has been received, when the cellular network is available, controlling a cellular network transceiver to share information between the vehicle and one or more other vehicles of the group of vehicles via the cellular network, and when the cellular network is unavailable or in response to receiving the user input indicative of the switchover request, controlling a low Earth orbit (LEO) satellite network transceiver to share information between the vehicle and the one or more other vehicles of the group of vehicles via an LEO satellite network and not via the cellular network.

Methods, systems, and devices are described for operating an airborne satellite terminal in high temperature conditions. In one method, a satellite terminal is located within an enclosure beneath a radome on an exterior of an aircraft. The satellite terminal includes a transmit amplifier that may operate in different power modes, a temperature sensor thermally coupled with the transmit amplifier, and an antenna. A transmit signal is amplified using the transmit amplifier to generate an amplified signal, which signal may be transmitted through the radome using the antenna. The temperature of the transmit amplifier may be monitored with the temperature sensor while transmitting the amplified signal. Operation of the transmit amplifier may be switched from a normal power mode to a reduced power mode to reduce a power level of the amplified signal when the monitored temperature of the transmit amplifier exceeds a temperature threshold.

The described features generally relate to determining dynamic signal quality criteria for an installation of satellite terminals for communications in a satellite communications system. In particular, the signal quality criteria for an installation may be based on an identified position of the satellite terminal to be installed, and in some examples based on the positions and signal characteristics of neighboring satellite terminals that have already been installed. In some examples, a signal quality map may be generated for a service beam coverage area, based on predetermined transmission characteristics and/or measured transmissions from a number of satellite terminals served by a communications satellite. The generated signal quality map may then be used to determine a signal quality threshold for the installation of a satellite terminal being installed for communications in a satellite communications system.

The present invention has an object to provide a specific communication technology for realizing effective communication with a flying object in a communication apparatus including the flying object. The communication apparatus includes a first base station, a flying object including a second base station, and a mobile terminal to communicate with the second base station. The first base station notifies flying object specification information that is information indicating that the second base station is included in the flying object. When the flying object specification information is received, the mobile terminal sets a direction of a beam for detecting the second base station to a second direction that is a direction vertically upward compared to a first direction that is the direction of the beam in a case where the flying object specification information is not received.

Methods, systems, and apparatus, including computer programs encoded on a computer storage medium, for training and using machine learning clustering models to determine conditions a satellite communication system. In some implementations, feature vectors for a time period are obtained. Each feature vector includes feature values that represent properties of a satellite communication system at a respective time during the time period. Each feature vector is provided as input to a machine learning model that assigns the feature vector to a based on the properties of the satellite communication system represented by the feature vector. Each cluster corresponds to a respective potential operating condition of the satellite communication system. Data is generated that indicates a likelihood that each potential operating condition is the actual operating condition based on a quantity of the feature vectors that have been assigned to the cluster corresponding to the potential operating condition during the time period.

Disclosed are apparatus and a method for receiving and transmitting radio frequency signals by a vehicle (8). The method comprises: providing a transceiver module (28), the transceiver module (28) being located on board the vehicle (8) and comprising a plurality of transceivers (40-56), each transceiver (40-56) being configured to operate within a different respective radio frequency band; receiving, by a first transceiver, a first radio frequency signal having a first frequency and a first waveform; determining, using the first frequency and first waveform, by a communications management module (36) located on board the vehicle (8), a second frequency and a second waveform, the second frequency being in a different frequency band than the first radio frequency signal, the second waveform being different to the first waveform; and transmitting, by a second transceiver, a second radio frequency signal having the second frequency and the second waveform.

The disclosed embodiments relate to methods for requesting and retrieving aircraft data during flight of an aircraft. This aircraft data can be used to perform additional monitoring of aircraft sub-systems to detect an abnormal condition, and/or to identify one or more sources that are causing the abnormal condition. In one embodiment, aircraft data for one or more relevant parameters can be requested from the ground, measured on-board the aircraft, and stored in a data file that is then communicated back to personnel on the ground. The real-time aircraft data for one or more relevant parameters can then be analyzed to identify the one or more sources that are causing the abnormal condition.

A multi-stage demultiplexing circuit in which a plurality of circuits each combining a selector and a frequency decimation circuit are connected is included. The selector selects one of input signals based on a control signal, and generates a plurality of output signals. The plurality of output signals output from the selector are input to the frequency decimation circuit, and the frequency decimation circuit performs frequency conversion processing, low pass filter processing, and down-sampling processing based on a control signal to generate an output signal. Two or more reception signals are input to the multi-stage demultiplexing circuit, and the multi-stage demultiplexing circuit executes demultiplexing processing based on a control signal so that an output signal that includes an unused band portion is prevented from being output downstream.

The present disclosure describes a method for creating data products in real-time with the aid of a ground station system. The method includes the steps of monitoring one or more communication links for newly captured sensor data and positional data of oblique images, saving the sensor data and positional data to one or more directories of one or more computer readable media, monitoring the one or more directories of one or more computer readable media for sensor data and positional data, processing the sensor data and positional data to create one or more data products for use by one or more mapping and exploitation systems responsive to the sensor data and positional data being saved in the one or more directories, and storing the one or more data products to one or more directories of one or more computer readable media.