Abstract: An optical method of displaying an expanded color image comprising extracting from input light bearing said colored image a first spectral portion and a second spectral portion such that together the two portions contain sufficient information for the image to be displayed in substantially its original colors, separately expanding the two spectral portions each in two dimensions and recombining the expanded spectral portions to display the expanded color image.

Abstract: An optical component for a display apparatus comprises an optical waveguide part (11) arranged to guide light therealong between surface parts thereof by internal reflection, an input part (13) arranged to receive light and direct the received light into the optical waveguide part, and an output part comprising a partially transmissive angularly reflective optical coating (25) arranged upon a surface part of the optical waveguide part. The output part is optically coupled to the input part by the optical waveguide part to receive guided light and to transmit some but not all of said guided light out from the optical waveguide part. The angularly reflective optical coating extends along a dimension of the optical waveguide part to expand the guided light in said dimension along the output part by repeated partial transmission thereof for output.

Abstract: The invention relates to a drive unit for a tracked vehicle such as a tracked forwarder. The drive unit comprises a track support beam, at least one drive wheel, a set of support wheels and an endless track, said at least one drive wheel being arranged to drive said endless track running over said at least one drive wheel and said set of support wheels. The drive wheel and the support wheels are rotatably attached in said track support beam. The drive unit further comprises an electric motor attached to said at least one drive wheel and integrated in said track support beam, and a track support beam integrated lubrication system comprising a pump unit arranged for pressurized supply of lubricant to parts of the drive unit in need of lubrication.

Abstract: Disclosed is a method and apparatus for machining a workpiece (2). The method comprises specifying a path along which a cutting tool (6) is moved during machining the workpiece (2), the path comprising segments (26); defining, for each segment (26), an exit point on that segment (26); defining, for each segment (26), an exit path (38) from the exit point of that segment (26) to a point remote from the workpiece (2); performing a machining process including moving the cutting tool (6) along the tool path and machining the workpiece (2); and, during the machining process, when one or more criteria are satisfied: interrupting the machining process and, without machining the workpiece (2), moving the cutting tool (6) to the exit point of the current segment (26) and then along the exit path (38) of the current segment (26).

Abstract: Disclosed is a method and apparatus for machining a workpiece (2). The method comprises: specifying a path along which a cutting tool (6) is to be moved during machining of the workpiece (2), the path comprising a plurality of segments (26); defining, for each segment (26), an entry point and an entry path (32) from a point remote from the workpiece (2) to that entry point; moving a first cutting tool (6) along the tool path from a first point to a second point and machining the workpiece (2); after the first cutting tool (6) has been moved to the second point, moving the first cutting tool (6) to a point remote from the workpiece (2); moving a second cutting tool (18) along the entry path (32) of the segment (26) that contains the second point, and then from the entry point to the second point.

Abstract: An evanescent-mode cavity filter with an improved MEMS tuner design is disclosed. The MEMS tuner design allows for the independent control of individual poles in a multi-pole filter, which increases the adaptability of the filter in a crowded RF environment. The filter is further designed to minimize tuning voltages and hysteresis effects. A closed loop control system provides highly responsive tuning of the filter. The closed loop control allows for accurate and stable tuning that compensates for temperature and vibrational effects, while the tuner design enables fast tuning and significantly increases the resolution of the feedback measurement by eliminating charge buildup in the tuner substrate.

Abstract: A method and apparatus are provided to store transaction records in a retrievable form and to enable subsequent search and retrieval of stored transaction records. Transaction records are captured and then grouped according to predetermined grouping criteria such that they may be indexed to a first level and then efficiently compressed for bulk storage. In the event that records need to be retrieved subsequently, the first level index may be used to select one or more groups of records satisfying first level search criteria and, following retrieval of the selected groups from storage and de-compression, a second level index may be created to enable a more detailed record-level search for matching records in the retrieved groups. Preferably, the same indexing technique is used for both the first and second level of indexing.

Abstract: A system for calculating airspeed and dynamic pressure comprises a system body, an internal accelerometer, located within the system body, an internal pressure sensor, located in the system body, the internal pressure sensor being not hermetically sealed within the system body and capable of measuring the static pressure of the ambient atmosphere, and a processor in reception of the internal accelerometer, and the internal pressure sensor, capable of calculating Mach number via an axial acceleration, and capable of calculating a dynamic pressure and a true airspeed via the Mach number.

Abstract: Methods, systems and computer readable storage devices for a four quadrant voltage limiter that limits a commanded phase voltage to within a volt second capability of an inverter by maintaining a rotor flux and folding back a torque under both motoring and regeneration torque commands. In one embodiment: (a) in a motoring operation, an upper limit for a q-axis voltage is enforced; and (b) in a regeneration operation a lower limit for the q-axis voltage is enforced.

Abstract: A passive 5x athermalized afocal beam expander comprising a housing integrally formed of a single material. Using titanium for the housing as well as lens materials having a minimal change of index of refraction over changes in temperature provides for a 5x athermalized afocal beam expander constructed to operate in a wavelength range from about 1460 nm to about 1675 nm at temperatures ranging from about ?40 degrees Celsius to about +75 degrees Celsius.

Abstract: A process for allowing a Concurrent Multi-Netting (CMN-4) equipped Link 16 terminal to enter an active network. After an initial entry command is entered at the terminal at a given current time at the terminal, a number of time slots are identified in which multiple receivers at the terminal have an opportunity to detect an initial entry message (IEM) after the given current time. Each of the receivers is set to detect an IEM during a different one of the identified time slots. When an IEM is first detected by one of the receivers, the current time at the terminal is reset based on the time slot in which the IEM was detected.

Abstract: A method for generating high power pulsed RF waveforms comprises the steps of charging a transmission line in a pulse forming network with a high-voltage and discharging the voltage on the transmission line to ground utilizing a gallium nitride photoconductive switch.

Abstract: The system and method of utilizing frequency waterfilling and implicit coordination to mitigate signal jamming in Link 16 systems. The system and method of utilizing frequency waterfilling for Link 16 includes updates to both software and firmware. The frequency waterfilling approach for Link 16 modifies the process by which data bits are allocated to hops based on an assessment of hops affected by jamming, thus avoiding portions of the spectrum occupied by a jammer.

Abstract: A pixel comprises a high-response photodiode that collects photocharge, a first transfer gate that enables the charge to be transferred off the high-response photodiode, completely emptying it onto a low-response photodiode, a second transfer gate enables the charge to be transferred off the low-response photodiode, completely emptying it onto floating diffusion, a third transfer gate for anti-blooming; the floating diffusion collects the transferred charge creating a change of voltage, a means of resetting the floating diffusion. A source-follower is modulated by the voltage on floating diffusion to control bit-line voltage and column-amplifier output. In examples, photocharge is integrated onto both the high-response photodiode and onto the low-response photodiode.

Abstract: A control system for an unmanned vehicle includes a control processing unit which receives input signals from one or more sensors and supplies output signals to one or more actuators. Processing modules are divided into a plurality of successively linked stages. In a first stage, multiple processing modules produce substantially equivalent payload data when operating correctly. Message cryptography units generate cryptographically signed messages containing the payload data. In a second stage, a voting cryptography unit receives and examines the cryptographically signed messages, and applies voting logic to derive a validated payload data for use by the respective processing module of the second stage.

Abstract: Multi-source multi-modal activity recognition for conducting aerial video surveillance comprising detecting and tracking multiple dynamic targets from a moving platform, representing FMV target tracks and chat-messages as graphs of attributes, associating FMV tracks and chat-messages using a probabilistic graph based mapping approach; and detecting spatial-temporal activity boundaries.

Abstract: A method for implementing interference mitigation in wireless network such as a Link 16 network does not require interference recognition and does not degrade signal detection even in the absence of interference. An unmitigated correlation score is obtained by correlating received, unmitigated preamble symbols with expected symbols. At least one of the input signals is also correlated after mitigation to obtain a mitigated signal. A mitigated correlation sore is obtained from the mitigated signals, and a mixed correlation score is obtained by combining mitigated and unmitigated signals. A signal is detected if any of the correlation scores exceeds a corresponding threshold. Embodiments use the unmitigated correlation for subsequent message time of arrival determination if the unmitigated correlation score is above its detection threshold. In embodiments, mitigation is applied to only one of the message frequencies.

Abstract: Techniques are provided for implementing a portable spectrum analyzer. An example system, according to an embodiment, includes a signal analyzer including an RF receiver to receive RF signals from an antenna, an analog-to-digital converter to generate a sampled signal based on the received RF signals, and a signal analysis co-processor to perform cognitive scanning analysis of the sampled signal. The cognitive scanning analysis includes detection, identification, and characterization of digital/analog signal(s) embedded in the sampled signal. The system may further include a communications interface circuit to provide communication between the signal analyzer and an associated mobile host platform (e.g., smartphone). The communication includes transmitting results of the cognitive scanning analysis to the mobile host and receiving parameters from the mobile host to control the operation of the cognitive scanning analysis.

Abstract: A method for controlling a digital display device of a head or helmet-mounted display system and a head or helmet-mounted digital display system implementing the method are provided with the aim of controlling the display device in such a way as to reduce the effect of dynamic false contouring on the quality of a displayed image. According to the method, received image data defining brightness levels according to a scheme of light pulse modulation based upon binary-weighted pulse durations are converted into a data defining a sequence of pulses of binary and non-binary weighted duration in which the highest value weighting represents a pulse of a duration less than half the total duration of illumination required during an image refresh period to achieve a pixel at the highest brightness level. In a further embodiment, the weighting of highest value represents a pulse of duration less than one quarter of the duration required for highest pixel brightness.

Abstract: A method and system for calibrating a rotational accelerometer. The method includes attaching a rotational accelerometer to be tested to a plate fitted with and second linear accelerometers and vibrating the plate. Angular acceleration measurements from the rotational accelerometer and linear acceleration measurements from the first and second linear accelerometers are obtained during the vibrating. The linear acceleration measurements are converted into angular acceleration values, and data representing, or usable for, a comparison of the angular acceleration measurements from the rotational accelerometer and the converted angular acceleration values is generated.