Abstract: A modem is configurable on a satellite, user terminal or gateway generates a radio frequency (RF) signal using an orthogonal frequency division multiplexing (OFDM) protocol including a radio frame including one or more bursts. A burst of the one or more bursts includes a first portion including burst detection data, a second portion including channel characteristic estimation data, a third portion including payload data, and fourth and fifth portions including pilot data. The first portion in a time domain is included in the burst prior to the second, third, fourth, and fifth portions. The first portion can include a pseudo-random noise sequence inserted in the time domain. The same physical modem can be configured to transmit signals on an uplink or downlink between a user terminal and a satellite or on the uplink or downlink between the satellite and the gateway.

Abstract: Various embodiments of the present technology relate to synthetic aperture radar image capturing and scene reconstruction using a cluster of multi-static satellite receivers. More specifically, in some embodiments, the cluster of receivers retrieves a flight path over a communication network. Flying in-formation, a lead or main satellite sends radio or wave pulses to a target area and additional satellites capture an echo of the wave pulses after the waves bounce off the target area to capture SAR radar data. The radar data can be transmitted from the cluster of satellites to a radar stations or to the main satellite. The radar stations or the main satellite receive the SAR radar data and mapping to reconstruct the data as SAR image data that can be reconstructed as 2D or 3D landscapes and scenes using the SAR image data.

Abstract: In one embodiment of the present disclosure, a housing for an antenna system having a plurality of antenna elements defining an antenna aperture includes a chassis portion, and a radome portion configured for coupling to the chassis portion to define an inner chassis chamber, the radome portion having a planar top surface, wherein the radome portion is configured to have equal spacing between the planar top surface and a top surface of each of the plurality of antenna elements defining the antenna aperture.

Abstract: An active trim system of a flight control system of an aircraft that transmits a tactile feel to a pilot of the aircraft in response to a manoeuvre. The active trim system includes: a manual control member (6) an elastic deformation means (1) and a reversible actuator (2), intermediate linkage member (4) and a controller. The actuator (2) includes a rod (5) and a motor (3) parallel to the elastic deformation means (1) and is movable by the motor (3) and by the motion of the manual control member (6). The intermediate linkage member (4) is linked to the manual control member (6) between the manual control member (6) and the elastic deformation means (1) and the reversible actuator (2), a controller configured to: move the reversible actuator (2) to a predetermined zero position, and to provide stiffness against a displacement of the intermediate linkage member (4).

Abstract: A method includes: during a first time period, pumping propellant: to a set of moderator coolant channels to cool the moderator; through a set of fuel elements to heat the propellant to a first outlet temperature; out of a thrust nozzle to produce a first thrust; and locating the reflector at a first closed position to reflect neutrons toward the set of fuel elements to maintain a fission rate of the set of fuel elements above a threshold fission rate. Additionally, during a second time period: locating the reflector at a second open position to reduce the fission rate of the set of fuel elements to below the threshold fission rate; and pumping the propellant through the fuel elements to heat the propellant to a second outlet temperature less than the first outlet temperature and out of the thrust nozzle to produce a second thrust less than the first thrust.

Abstract: The present invention concerns a method for performing SAR acquisitions, which comprises performing, in a time division fashion, SAR acquisitions of areas of a swath of earth's surface by means of a SAR system carried by an air or space platform; wherein performing SAR acquisitions in a time division fashion includes contemporaneously acquiring, in each pulse repetition interval, a plurality of areas of the swath that are separated in azimuth; and wherein the areas acquired in T successive pulse repetition intervals form an azimuth-continuous portion of said swath, T being an integer greater than one.

Abstract: A method, apparatus, and system are provided for the printing and maturation of living tissue in an Earth-referenced reduced gravity environment such as that found on a spacecraft or on other celestial bodies. The printing may be three-dimensional structures. The printed structures may be manufactured from low viscosity biomaterials.

Abstract: Various embodiments of resettable pyrotechnically actuated poppet valve systems are disclosed herein. A resettable pyrotechnically actuated poppet valve system includes a pin assembly including a pin for engaging a moveable poppet closed against a valve seat and a shoulder for supporting the pin when a pyrotechnic device is disengaged. The system includes a valve body coupled to the pin assembly. The valve body includes an inlet and an outlet. The system includes an internal valve body disposed within the valve body. The moveable poppet is at least partially disposed within the internal valve body for contacting the valve seat. The pin maintains the poppet closed against the valve seat in a first position when the pyrotechnic device is disengaged and the poppet transitions to a second position by movement of the pin when the pyrotechnic device is engaged.

Abstract: A facial recognition method and apparatus are provided. In the method, facial pose features and facial features can be fused; that is, detailed information of the facial pose features and the facial features can be fused, and a target facial feature and facial pose information of a facial image to be subjected to recognition are generated according to the fused features, such that accuracy of the determined target facial feature and facial pose information is improved, thereby improving accuracy of a user recognition result determined according to the target facial feature and the facial pose information.

Abstract: Examples described herein include methods and computing systems which may include examples of calculating risk scores for certain natural disasters perils based on machine learning model outputs. For example, a machine learning model may weight each of the pixels of a map in accordance with the set of weights associated with a structure, to calculate a risk score for a particular natural disaster peril associated with that structure. A plurality of risk selections may be provided to a user computing device for selection by a user, with those risk selections being associated with that risk score. Advantageously, the computing system facilitates the interaction of datasets with different measurement parameters in a machine learning model. In normalizing datasets before providing the datasets to input nodes of a machine learning model, a computing system may efficiently provide hazard and vulnerability outputs of the machine learning model.

Abstract: A node of a satellite constellation system includes a global positioning receiver configured to receive first signaling from a first plurality of non-LEO navigation satellites of a constellation of non-LEO navigation satellites in non-LEO around the earth. A transceiver is configured to send and receive inter-node communications with other nodes of the satellite constellation system. At least one processor is configured to execute operational instructions that cause the at least one processor to perform operations that include: determining a state of the node of the satellite constellation system based on applying precise point positioning (PPP) correction data to the first signaling, wherein the PPP correction data is received separately from the first signaling; and generating a navigation message based on the state of the node.

Abstract: A satellite includes a first radiator panel with first heat-generating components attached to its surface and a second radiator panel with second heat-generating components attached to its surface. One or more actuators are configured to deploy the first and second radiator panels from a compact configuration in which the first and second radiator panels are overlapping to a deployed configuration in which the first and second radiator panels are non-overlapping.

Abstract: Technology is disclosed herein for preventing or at least significantly reducing shock to spacecraft such as satellites when releasing a hold-down rod assembly that clamps the spacecraft to, for example, a launch vehicle adaptor. The hold-down rod assembly has tension rods that may be pre-loaded at considerable tension in order to hold down a stack of spacecraft in a launch configuration. In an embodiment, pneumatic actuators are used to slowly release the tension in the tension rods. Therefore, shock to the spacecraft is prevented or at least significantly reduced.

Abstract: In an embodiment, an apparatus includes a first baseband section to receive a calibration signal; a first radio frequency (RF) section configured to generate a RF calibration signal based on modulating the calibration signal. The calibration signal comprises an orthogonal code based signal. The apparatus includes a second RF section to receive the RF calibration signal and generate a received calibration signal based on demodulating the RF calibration signal; a calibration section; a first antenna electrically coupled to the first RF section and configured to transmit the RF calibration signal; and a second antenna electrically coupled to the second RF section and configured to receive the RF calibration signal. The calibration section is configured to determine one or more of gain, baseband delay, or RF delay to calibrate the first RF section; and the second antenna is switchable between receiving the RF calibration signal and transmitting an encoded data signal.

Abstract: In a method for performing gaze redirection, a video stream of a user is received, each video frame from the video stream including a depiction of a gaze of the user. For each video frame from the video stream, an estimated gaze direction of the gaze of the user in that video frame is determined. A field of view (FOV) for a virtual representation associated with the user in a virtual environment is determined. An updated video frame including a modified gaze direction of the user different from the estimated gaze direction of the gaze of the user is generated.

Abstract: A medium composition for culturing porcine pluripotent stem cells is disclosed. The medium composition suitable for culturing porcine pluripotent stem cells can maintain the pluropotency and stemness of porcine pluripotent stem cells in vitro for an extended period of time and allows stem cells to be cultured in a feeder cell-free manner.

Abstract: A cube satellite deployer system having a body plate, a communication unit, a power unit, and a control unit. The body plate is adapted to be connected to a space arm assembly. The communication unit and the power unit are attached to the body plate. Each of the communication unit, power unit, and the control unit are in communication with one another. The body plate is also adapted to receive one or more cube satellite housings. The cube satellite housings are adapted to house and selectively launch one or more of the cube satellites that are housed by the cube satellite housings.