Abstract: A cavity system for use on a vehicle is provided. The cavity system comprises a cavity having at least one of a front edge and a rear edge arranged orthogonally to the actual or intended direction of travel of the vehicle, and longitudinal edges. The front and/or rear and longitudinal edges define an opening. The cavity system also comprises at least one shock stabiliser protruding from a surface adjacent each longitudinal edge of the cavity into the ambient flow outside of the cavity. An aircraft comprising the cavity system is also provided.

Abstract: A cavity system for use on a vehicle is provided. The cavity has a front edge and/or a rear edge and longitudinal edges. The front and/or rear and longitudinal edges define an opening. The cavity comprises at least one elongate flow partition protruding from a surface adjacent each longitudinal edge of the cavity into the ambient flow outside of the cavity. The at least one flow partition comprise an inboard surface facing predominantly towards the cavity and an outboard surface facing predominantly away from the cavity. An aircraft comprising the cavity system is also provided.

Abstract: A cavity system (300-600) is provided. The cavity system comprises a cavity (2) and a spoiler (304-604). The spoiler (304-604) comprises at least one plate (4) having a front surface and a rear surface, and an undulating edge. The spoiler (304-604) is positioned in the proximity of 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), and the spoiler (304-604) is arranged with its longitudinal axis (1) perpendicular to or at an oblique angle to the actual or intended flow direction (3) such that the front surface faces towards the flow direction (3).

Abstract: A prismatic collimating device to collimate image bearing light is disclosed. The prismatic collimating device comprises a first prism and a second prism arranged to receive and collimate a light beam. The first prism comprises an output surface adjacent to an input surface of the second prism. The first prism and second prism are arranged such that the light beam undergoes total internal reflection and refraction at both the output surface of the first prism and the input surface of the second prism. Each of the first prism and second prism comprising at least three optically powered surfaces.

Abstract: A switch matrix circuit module for routing signals. In an example, the module includes a switch matrix coupled with first and second switches. The switch matrix is configured to receive a plurality of input signals, and output a selected one of the plurality of input signals as a first intermediate signal and another selected one of the plurality of input signals as a second intermediate signal. The first switch receives the first intermediate signal and a first auxiliary signal, and outputs a first output signal, and the second switch receives the second intermediate signal and a second auxiliary signal, and outputs a second output signal. A number of the modules can be coupled together to provide a switch matrix circuit, which can be readily scaled by adding further modules. In an example, the plurality of input signals are radio frequency (RF) signals.

Abstract: A chassis configured to hold a cards of at least two form factors comprising: slots disposed in an inner portion the chassis, wherein the slots are aligned with one another and configured to act as card guides; a mid-height structure disposed adjacent a side wall of the chassis, the mid-height structure comprising a second plurality of slots and a third plurality of slots disposed on top and bottom surfaces of the mid-height structure that are substantially parallel to top and bottom walls of the chassis; and a plurality of cooling channels disposed within the walls of the chassis as well as within the mid-height structure, wherein the second and third plurality of slots are configured to align with at least a subset of the plurality of slots disposed in the top and bottom chassis walls and to act as card guides.

Abstract: A guided vehicle that includes a body, a propulsion system operably engaged inside of the body, a housing operably engaged with the body and encasing a guidance device inside of the housing, a viewing window of the guidance device, and a cover moveably engaged with the housing, wherein the cover is moveable between a pre-flight configuration and a flight configuration. In the pre-flight configuration, the cover covers the viewing window. In the flight configuration, the cover is configured to expose the viewing window in the flight configuration in response to an impulse of acceleration generated by a launch of the guided vehicle.

Abstract: Laser control circuitry is described. In one example, a laser controller integrated circuit (IC) includes first and second input ports, a sideband direct digital synthesizer (DDS) coupled to the first input port and configured to produce a modulation signal and a reference signal based on an input signal received via the first input port, the modulation signal and the reference signal having a same frequency. The laser controller IC further includes a Pound-Drever-Hall frequency-locking control loop coupled to the second input port and to the sideband DDS, and configured to produce a corrected DC bias current signal based on the reference signal and a measurement signal received via the second input port, and a thermal management circuit configured to produce at least one thermal control signal.

Abstract: A rake assembly for measuring fluid flow parameters in a fluid flow rig, comprises: a rake assembly support frame; a housing mounted on the rake assembly support frame; the housing comprising a wall which defines a flow passage, with a flow inlet and a flow outlet, the flow passage extending from the flow inlet to the flow outlet. The housing is cylindrical and is centred on a longitudinal axis. An instrumentation arm extends from a leading edge end to a trailing edge end, and the instrumentation arm extends from the housing wall to extend at least part of the way across the flow passage, the leading edge end located in an Aerodynamic Instrument Plane (AIP); the housing being rotatably mounted to the rake assembly support frame; such that the housing and instrumentation arm are operable to rotate at least part of the way around the longitudinal axis.

Abstract: Techniques are provided for mitigating interferometric angle ambiguity.

Abstract: A sample and hold amplifier output buffer with the low leakage of metal oxide semiconductor field effect transistors (MOSFET) combined with the linearity and dynamic range of silicon-germanium (SiGe) bipolar junction transistors (BJT). In one aspect, the present disclosure provides a sample and hold amplifier output buffer placing a MOSFET input device between the base and emitter of a high linearity SiGe BJT.

Abstract: Various countermeasure dispensing systems (or CMDSs) and method of use are described herein. CMDS may include a dispenser assembly operably engaged with a platform where at least one electrical connection provides electrical communication between the dispenser assembly and a sequencer. CMDS may also include a magazine assembly operably engaged with the dispenser assembly, wherein the magazine assembly comprises a magazine configured to hold at least two countermeasure expendables. CMDS may also include a breechplate assembly operably engaged with the magazine assembly and adapted to dispense the at least two countermeasure expendables. CMDS may also include at least one magazine identification switch (MIS) operably engaged with the magazine assembly and the breechplate assembly. CMDS may also include that the at least one MIS is configured to enable the sequencer and the breechplate assembly to selectively dispense at least one countermeasure expendable from the at least two countermeasure expendables.

Abstract: There is described a reconfigurable array for facilitating dynamic combination and distribution of RF signals.

Abstract: Systems and methods for pointing a high gain antenna or other directional instrument connected to a platform by a gimbal are provided. A control system as disclosed can include a flight computer having a processor for executing software and a motor control board having a controller for implementing at least portions of a control algorithm. The software executed by the processor generates pointing commands and implements a Kalman filter included in a feedback loop in the form of a linear Kalman filter disturbance estimator of the control algorithm implemented by the controller. The control algorithm can further implement a proportional control position loop and a proportional control rate loop. Each axis of the gimbal is provided with an instance of the control algorithm and the Kalman filter. Moreover, the processor can be operated at a rate that is less than a rate at which the controller is operated.

Abstract: A optical apparatus to display an image to a user is disclosed. The apparatus comprises an image source to generate an image bearing light beam having a first numerical aperture; and a diffuser screen. The diffuser screen is configured to increase the numerical aperture of the image bearing light beam to a second numerical aperture. The diffuser screen comprises a first part comprising: a first face and second face substantially parallel to each other, a first array of a plurality of waveguides forming an optical path between the first face and the second face. A value of an optical property of each of the plurality of waveguides is selected randomly from a set of values of the optical property. The first array of a plurality of waveguides is arranged such that each of the plurality of waveguides has an optical axis that is substantially parallel to it's nearest neighbour.

Abstract: There is provided a sacrificial sensor configured to be coupled with a part and provide an indication of damage in the part, wherein an electrical property of the sacrificial sensor is configured to change as the sacrificial sensor is damaged to indicate damage to the part.

Abstract: Various systems and methods for leveraging legacy countermeasure dispensing systems (CMDSs). The legacy CMDSs are leveraged through the expansion of breechplates and magazines in a CMDS by expanding the amount of expendables carried by a CMDS while still maintaining the legacy sequencer and dispenser in a legacy military platform, such as an aircraft. In addition, various circuitry systems are included in a circuit card of the breechplate for duplicating and/or expanding the firing lines provided in a legacy CMDS.

Abstract: An image generation system and method for displaying an Augmented Reality “AR” image of a real-world environment having one of more objects located therein and one or more AR objects each corresponding to a respective object, the system comprising: a display on which the image of the real-world environment and the AR objects are displayed; a processing and control module configured to: receive, from one or more sensors, data relating to the real-world environment and objects therein; create the one or more AR objects from the objects by determining additional information relating to the object which is represented by at least one of symbols, annotations and fonts to be attached to the AR object to act as a displayed component: displaying the AR image comprising the real-world image and one or more AR objects; wherein the AR objects once created are stored for future retrieval based on a unique identifier for the AR object which remains active as long as the object is of interest.

Abstract: A method is disclosed of efficiently synchronizing time bases of multi-netting network nodes. A first node transmits a synchronizing request on a subnet associated with the highest time quality in its source table, then simultaneously monitors that subnet and up to three additional subnets associated with lower time qualities in its source table. If the first node does not receive a response, it transmits the request on the subnet associated with the next highest time quality in its source table. A second node simultaneously monitors the subnet associated with its time quality and a plurality of subnets associate with consecutively higher time qualities. Upon receiving the synchronization request, it responds on the subnet associated with its time quality. The disclosed method is fully compatible with networks that include single-netting nodes, and can be implemented by a JTRS node exchanging RTT messages on a Link 16 network.

Abstract: A router node comprises a link discovery module, a security module, a secure access module and storage. The link discovery module discovers a link to an adjacent router node and receives its first loopback address. The link discovery module creates a first tunnel between the security module in the router node and the first loopback address. The security module receives a second loopback address for the second router node, and creates a second tunnel. The security module repeats the discovering, receiving and creating steps for each router node adjacent to the first router node. The storage separately stores a link discovery routing table which comprises information relating to the links between the router node and each adjacent router note; a security routing table which stores the unique first loopback address; and a secure access routing table which stores the unique second loopback address.