Abstract: The present disclosure relates to radar decoys, methods for controlling radar decoys and UAVs having a radar decoy. The radar decoy may comprise a passive reflector arranged to reflect radar signals, and a semi-active metasurface configured to have a reflection coefficient with a time-variable complex component. The present disclosure also relates to a method of controlling a semi-active radar metasurface.

Abstract: A system and method for detecting anomalous system behaviour. The system includes a plurality of sensors and a trained autoencoder. The method of training includes: obtaining training data and test data comprising multiple data records for at least one engineering asset which corresponds to the engineering asset whose behaviour is to be classified, wherein the data records comprise a plurality of sensor readings for the engineering asset; fitting the autoencoder to the obtained training data; running the test data through the encoder of the fitted autoencoder to obtain encodings of the test data; generating a plurality of data sets from the obtained encodings, wherein the generated plurality of data sets include under-represented data sets; cloning the fitted autoencoder to create a cloned autoencoder for each of the generated plurality of data sets; and aggregating the cloned autoencoders to form an over-arching autoencoder.

Abstract: According to an aspect of the present invention there is provided an optical device made according to an augmented reality optical design, the optical device comprising a plurality of optical elements for transmitting a light from a light source for display on an eye of a user, wherein the optical device comprises: a light source generating the light; a lens assembly off-axis from the light source and configured to receive the light; a first at least partially mirrored device; a second optical device located intermediate the lens assembly and the first at least partially mirrored device, the second optical device configured to receive the light from the lens assembly and transmit the light to the first at least partially mirrored device; and a combiner receiving the light from the first at least partially mirrored device and directing the light to form a virtual image at an exit pupil at the position of the eye.

Abstract: Described herein is an active throttle quadrant assembly. The active throttle assembly comprises a lever mounted via a first pivot at a proximal end of the lever and a grip on a distal end of the lever.

Abstract: A cavity system is provided. The cavity system (100-600) comprises: a cavity (2) and a spoiler (104-604); and the spoiler (104-604) having a front surface and a rear surface. The spoiler (104-604) is positioned in proximity to a leading edge (14) of the cavity (2), the leading edge (14) being relative to an actual or intended flow direction (3) of a fluid over the cavity (2). The spoiler (104-604) is arranged with its longitudinal axis perpendicular or at an oblique angle to the actual or intended flow direction (3) such that the front surface faces towards the flow direction (3). A first region of the spoiler (104-604) extends further toward the leading edge than a second region of the spoiler (104-604).

Abstract: The present invention relates to energy efficient machine learning (ML) models, in particular to energy efficient ML model generation for energy efficient inferencing. According to an aspect of the invention, there is provided a computer implemented method of operating an ML training system for training a ML model.

Abstract: An air vehicle is provided. The air vehicle comprises: a fuselage; a wing body and a pair of opposing wing members extending substantially laterally from the wing body; a stabiliser for generating force that, in use, counteracts torque exerted on the fuselage by the rotating wing body; a rotor mast for coupling the wing body to an upper side of the fuselage, wherein in a first configuration of the air vehicle the rotor mast is locked such that the wing body does not rotate relative to the fuselage and in a second configuration of the air vehicle the rotor mast is unlocked such that the wing body rotates relative to the fuselage; and propulsion means for providing linear thrust in the first configuration and for providing rotary thrust in the second configuration. A method of controlling an air vehicle is also provided.

Abstract: In some examples, an acoustic absorbing structure comprises a surface comprising an array of apertures, each aperture defining an opening for a corresponding channel, each channel forming a non-resonant acoustic attenuation structure with an axially decreasing cross-section over at least a portion of the length of the channel.

Abstract: The present invention relates to an augmented vision system (200) for a platform operator.

Abstract: Described herein is a method of controlling a multi-quadrant active throttle assembly. The method comprises: receiving force and position data for a plurality of levers in the multi-quadrant active throttle assembly; analysing the force and position data to determine whether a threshold is exceeded; in response to determining that the threshold is not exceeded, operating in a first mode of operation in which the plurality of levers are controlled collectively; and in response to determining that the threshold is exceeded, operating in a different mode of operation in which the plurality of levers are not controlled collectively.

Abstract: An optical device made according to an augmented reality optical design, the optical device comprising a plurality of optical elements for transmitting a light from a light source for display on an eye of a user, wherein the optical device comprises: a light source generating the light; a lens assembly off-axis from the light source and configured to receive the light wherein the lens assembly includes a plurality of lenses and wherein the lens assembly has been truncated by removal of material from the or each lens of the plurality of lenses where an expected light beam is not predicted to pass; a combiner, receiving the light from the lens assembly via one or more further optical elements of the plurality of optical elements and directing the light to form a virtual image at an exit pupil at the position of the eye.

Abstract: A tool engagement coupler configured to deliver a tool at a working position on a workpiece, the tool engagement coupler further being moveable by a robotic arm to engage with a locator at the working position. The tool engagement coupler includes an engagement member having a first predetermined shape adapted to engage with the locator having a second predetermined shape. The tool engagement coupler is adapted to be moved by the robotic arm based on a decreasing level of spatial tolerance as the engagement member approaches the locator based at least in part on the first predetermined shape and the second predetermined shape.

Abstract: A method (500, FIG. 5A) of training a machine learning model 300. The method (500, FIG. 5A) comprises receiving (504, FIG. 5A) training data 310 comprising a plurality 314 of samples. Each sample corresponds to a transmission of a respective jamming signal to a respective target device of a plurality 312 of target devices. Each sample comprises a jamming efficacy of the respective jamming signal and a value of each of one or more signal parameters that define a waveform of the respective jamming signal. The method (500, FIG. 5A) further comprises training (506, FIG. 5A), using the training data 310, the machine learning model 300 to learn a mapping between each combination of target devices from the plurality 312 of target devices and a respective waveform. Each waveform is effective, when transmitted in a collective jamming signal, to jam all of the target devices in the respective combination of target devices.

Abstract: An apparatus for controlling an unmanned vehicle is described. The apparatus comprises: a receiver for receiving a first vehicle control signal from a remote controller; a memory for storing a route for the vehicle to follow; and a processor. The processor is configured to: determine characteristics of the first vehicle control signal; and generate a second vehicle control signal, wherein the second vehicle control signal comprises an instruction for the vehicle to perform a manoeuvre to follow the route. The apparatus further comprises a transmitter configured to transmit the second vehicle control signal, arranged to have the determined characteristics, to the vehicle. A system and method for controlling an unmanned vehicle are also described.

Abstract: The present invention relates to detecting anomalies in air data, in particular to the use of hierarchical temporal memory models to detect anomalies. According to a first aspect of this specification, there is described a computer method of anomaly detection in air data.

Abstract: There is provided a tool engagement coupling system configured to engage a tool engagement coupler with a locator located relative to a workpiece at a working position of a tool, the system comprising: a robotic arm linked to the tool engagement coupler and moveable in multiple axes relative to the workpiece to position the tool engagement coupler at the working position via the locator; wherein the robotic arm operates in one or more impedance modes the or each of which is configured to give rise to a different stiffness in one or more of the axes of motion of the tool engagement coupler.

Abstract: According to the present disclosure there is provided a switch for controlling electrical power supplied by a power source to an electronic safe and arm unit, ESAU, or a munition, the switch comprising: a contact assembly arrangement comprising a contact assembly of a first type arrangeable in a first arrangement defining a first switch state and a second arrangement defining a second switch state, wherein centrifugal force caused by rotation of the switch causes movement of at least a part of the contact assembly of the first type to change the arrangement of the contact assembly of the first type from the first arrangement to the second arrangement.

Abstract: According to the present disclosure there is provided an antenna comprising: an antenna element comprising: a magnetostrictive layer; and a piezoelectric layer, wherein the antenna further comprises a transducer arrangement comprising: one or more transducers operable to generate a mechanical strain field in the antenna element to produce displacement of the surface of the magnetostrictive layer.

Abstract: A nuclear fission reactor system (10) which comprises a nuclear reactor unit (12) having a fuel block (400) with a central axis (402) extending along the length of the fuel block (400) between a first surface (412) and a second surface (422). The fuel block (400) defines a plurality of fuel assembly chambers (404) which extend from an inlet opening (410) on the first surface (412) of the fuel block (400) to an outlet opening (420) on a second surface (422) of the fuel block (400). There are also provided a plurality of fuel assemblies (100). Each fuel assembly (100) comprises a fuel compact (200) which defines a flow passage (202) running from a flow inlet (204) provided at a first end (206) of the fuel compact (200) to a flow outlet (208) provided at a second end (210) of the fuel compact (200), the passage (202) defining an internal surface (222) of the fuel compact (200).

Abstract: A laser weapon countermeasure device is described. The laser weapon countermeasure device comprises a sealed capsule having a filler disposed therein. The filler comprises either: a reflective particulate metal; or a precursor for a reflective metal or reflective metal alloy. The capsule is configured to burst in air such that the filler disperses into an aerosol. A countermeasure launcher and a vehicle comprising a countermeasure launcher are also described.