Abstract: An antenna assembly includes an antenna feed configured to receive a signal over a wide bandwidth, a ground plane, and an antenna element. The antenna element includes first and second conductive dipole arms each in planar alignment with a surface of the ground plane and adjacent to each other. The antenna assembly further includes a conductive wall (“H-wall”) in electrical communication with the ground plane and having an end adjacent to, and physically separate from, the second conductive dipole arm, where an axial length of the H-wall being orthogonal to the ground plane, and a resistive surface having an attenuation effect on the reflected signal from the ground plane.

Abstract: A method of determining a schedule for a pointing device includes distributing targets among a plurality of groups and assigning schedules to the groups, after which the groups and group schedules are not modified. A partial pointing schedule is successively grown by selecting a list of remaining groups, and appending a best candidate sub-schedule for the list to the partial schedule. If a sub-schedule cannot be found for which the grown partial schedule meets all applicable requirements, the partial schedule is pruned to a previous state and a different, previously evaluated sub-schedule is appended to the pruned partial schedule to attempt re-growth. Groups, group schedules, lists, and sub-schedules can be selected according to values, dwell times, and/or windows of performance of the targets, groups, and sub-schedules. If no schedule is found that meets all requirements, a missed group can be excluded from the schedule.

Abstract: An adaptive filter protocol stored on a non-transitory computer readable medium that is operatively in communication with a processor of a platform. The adaptive filter protocol includes a first processing loop that is operatively in communication with at least one receiving device of the platform for receiving at least one input signal. The adaptive filter protocol also includes a second processing loop that is operatively in communication with the first processing loop and has a deterministic gradient descent optimization logic and an interpolation logic. When the at least one receiving device receives the at least one input signal, the adaptive filter protocol enables the processor to generate a refined match filter parameters that substantially correlates with the initial parameters of the at least one input signal upon completing a plurality of refining cycles of the second processing loop.

Abstract: An adaptive filter protocol stored on a non-transitory computer readable medium that is operatively in communication with a processor of a platform. The adaptive filter protocol includes a first processing loop that is operatively in communication with at least one receiving device of the platform for receiving at least one input signal. The adaptive filter protocol also includes a second processing loop that is operatively in communication with the first processing loop and has a deterministic gradient descent optimization logic and an interpolation logic. When the at least one receiving device receives the at least one input signal, the adaptive filter protocol enables the processor to generate a refined match filter parameters that substantially correlates with the initial parameters of the at least one input signal upon completing a plurality of refining cycles of the second processing loop.

Abstract: A computer program product and corresponding method for targeting one or more points in a three dimensional (3D) model is provided. The computer program product including least one non-transitory computer readable storage medium in operative communication with a computer processing unit (CPU), the storage medium having instructions stored thereon that, when executed by the CPU, implement a process to register the 3D model with a stereoscopic image pair. The steps performed include inputting a first image and a second image that define a stereoscopic image pair into an object targeting program, wherein an object is shown in the first image and the second image, inputting a three dimensional (3D) model of the object into the object targeting program, registering the 3D model to the stereoscopic image pair, and targeting a point associated with or near the object based on the 3D model having been registered to the stereoscopic image pair.

Abstract: An ultra-wideband radio frequency (RF) apparatus for combining and/or dividing RF signals. RF apparatus includes a circuit board, a communication cable that operably engages with the circuit board, at least two transmission lines that are formed on the circuit board and operably engages with the communication cable, and at least two connectors that operably engages with the at least two transmission lines. The RF apparatus is operable in a first configuration and a second configuration. When the RF apparatus is provided in the first configuration, the RF apparatus is operable to divide a first RF signal into at least two RF signals. When the RF apparatus is provided in the second configuration, the RF apparatus is operable to combine the at least two RF signals into a second RF signal. The RF apparatus is capable of achieving a low insertion loss less than 1 dB over a bandwidth greater than 20:1.

Abstract: A method of growing large GaAs or GaP IR window slabs by HVPE, and in embodiments by LP-HVPE, includes obtaining a plurality of thin, single crystal, epitaxial-quality GaAs or GaP wafers, cleaving the wafers into tiles having ultra-flat, atomically smooth, substantially perpendicular edges, and then butting the tiles together to form an HVPE substrate larger than 4 inches for GaP, and larger than 8 inches or even 12 inches for GaAs. Subsequent HVPE growth causes the individual tiles to fuse by optical bonding into a large “tiled” single crystal wafer, while any defects nucleated at the tile boundaries are healed, causing the tiles to merge with themselves and with the slab with no physical boundaries, and no degradation in optical quality. A dopant such as Si can be added to the epitaxial gases during the final HVPE growth stage to produce EMI shielded GaAs windows.

Abstract: A method of manufacturing a structurally competent, EMI-shielded IR window includes using a mathematical model that combines the Sotoodeh and Nag models to determine an optimal thickness and dopant concentration of a doped layer of GaAs or GaP. A slab of GaAs or GaP is prepared, and a doped layer of the same material having the optimal thickness and dopant concentration is applied thereto. In embodiments, the doped layer is applied by an HVPE method such as LP-HVPE, which can also provide enhanced GaAs transparency near 1 micron. The Drude model can be applied to assist in selecting an anti-reflective coating. If the model predicts that the requirements of an application cannot be met by a doped layer alone, a doped layer can be applied that exceeds the required IR transparency, and a metallic grid can be applied to improve the EMI shielding, thereby satisfying the requirements.

Abstract: Techniques to passively suppress or otherwise reduce stimulated Brillouin scattering (SBS) in a pumped fiber laser system. The system can be co-pumped with a tandem pumping technique, and counter-pumped with the direct diode pumping method. In an example, a pumped fiber laser system includes a fiber, a tandem pump, and a direct diode pump. The fiber has a core, an inner cladding around the core, and an outer cladding around the inner cladding. The tandem pump co-pumps light of a first wavelength in the inner cladding from a first end of the fiber, and the direct diode pump counter-pumps light of a second wavelength in the outer cladding from a second end of the fiber. A longitudinal temperature gradient can form along the fiber laser in response to this hybrid-pumping, which can combine both tandem and direct diode pumping.

Abstract: A feed forward guidance kit for a ballistic device that includes at least one optical imaging sensor, a processor that is operatively in communication with the at least one optical imaging sensor, and a feed forward guidance protocol that is stored on a computer readable medium and that is operatively in communication with the processor. When the at least one optical imaging sensor initially intercepts an aircraft at an initial location during combat, the feed forward guidance protocol instructs the processor to proactively calculate an anticipated second position of the aircraft as an orientation of the aircraft changes from an initial orientation to a translated orientation.

Abstract: Techniques are provided for jammer detection. A methodology implementing the techniques according to an embodiment includes steering a beam in a specified direction to generate a power measurement, the specified direction selected from a plurality of directions, such that the method comprises scanning through the plurality of directions. The method also includes adaptively steering a null in the specified direction and measuring a gain of the received signal in the null direction. The method further includes calculating a difference between the power measurement and the measured gain and generating a difference-based detection that the received signal is associated with a jammer at the specified direction. The difference-based detection is based on a comparison of the power difference to a power difference threshold value. The power difference threshold value is based on a desired probability of false alarm and probability of detection, and/or desired angular resolution.

Abstract: Hybrid MB/ML techniques for automated printed circuit board (PCB) defect detection. In one example, a PCB inspection system implements a hybrid solution using model based (MB) and machine learning (ML) technologies to detect possible defects in a PCB via an automated image capture device and processing methodology. The processing methodology fuses features from MB and ML at the latent representation. An autoencoder can be used to learn the fused data by training a neural network to produce a reconstructed image that can be compared to an original image to generate a reconstruction error value. The system produces an output indicating detection of a defect in one or more features of interest based on the reconstruction error value transgressing a threshold value.

Abstract: Techniques to dynamically adjust the corner frequency of a high-pass filter in response to a time-domain amplitude value of an output signal, thereby preserving accuracy while promptly recovering the signal's baseline value. A system can be configured to filter frequency-domain values of an input signal based on a filtering characteristic. The filtering characteristic can be set dynamically in response to a time-domain value of an amplitude of an output signal. The filtering characteristic can comprise a corner frequency, and the system can include a high-pass filter configured to filter out frequency components at frequencies lower than the corner frequency. The system is configured to dynamically change the corner frequency from a first value to a second value, in response to the time-domain value of the amplitude crossing a threshold value. The system may dynamically change the corner frequency within a time interval after the crossing.

Abstract: A liquid-cooled printed circuit board chassis, such as a Eurocard chassis, is manufactured without brazing by 3D printing a plurality of components, smoothing and completing the components by subtractive manufacture, and then aligning and assembling the final chassis, all without application of heat. Horizontal cooling channels 3D printed within the chassis components are in thermal contact with board slots, and are divided into subchannels by closely spaced internal walls that function as thermal baffles. The baffles are tilted at oblique angles to increase their cooling efficiency, and to enable AM manufacture without temporary support structures. Elastomer seals between components can connect the cooling channels to vertical connecting channels. EMI seals can be formed between the components by EMI gaskets. The components can be aligned by alignment pins, and joined together by bolts, screws, and/or adhesives.

Abstract: A panoramic Mid-Wavelength Infrared (MWIR) lens has a plurality of optical elements, wherein each optical element from the plurality of elements is formed from a material that transmits in at least the MWIR band from 3 ?m to 5 ?m. The plurality of optical element are arranged in a manner that provides a 360 degree azimuth angle and an elevation angle that is within +/?20° from a 90° horizon. The panoramic MWIR lens is configured to be connected to a cooled Dewar, wherein the Dewar includes a cold shield and an image plane to detect light in the MWIR band transmitted through the plurality of optical elements.

Abstract: Techniques and architectures are disclosed for a system capable of creating large changes in buoyancy that can be incorporated into underwater vehicles, embodiments of the system utilizing edge-welded, metal bellows disposed within a pressure vessel to balance a pressure differential across the bellows while using the bellows to displace fluid and thereby alter the buoyancy of a vehicle on which the system is disposed.

Abstract: A multi-bit, asynchronous e-fuse macro, the macro comprising: an input output enable, a power on reset, a write address, an input write enable, a ground clamp enable, and a write clock; a plurality of e-fuse bits; a supply voltage configured to allow programming at least one of the e-fuse bits; at least one fuse output; and self-timing and control circuitry configured to perform signaling, wherein each of the inputs is in electrical communication with the e-fuse macro.

Abstract: A signal acquisition and tracking device includes an input configured to receive a global navigation satellite system (GNSS) signal, a software-based processor configured to execute software instructions to acquire the GNSS signal via the input and to generate, based on the acquired signal, one or more signal tracking parameters, and a hardware logic circuit operatively coupled to the processor. The logic circuit is configured to track the GNSS signal independently of the processor using the one or more signal tracking parameters generated by the processor. In some examples, the processor is configured to pull in and center the GNSS signal in time and frequency, and the logic circuit is further configured to track the pulled in and centered GNSS signal independently of the processor. In some examples, the processor acquires the signal and then hands-off control to the logic circuit for subsequent tracking of the signal.

Abstract: Techniques are provided for non-integer interpolation for signal sampling. A system implementing the techniques according to an embodiment includes a memory configured to store frequency values associated with an input signal sampled at a first clock rate. The system also includes a clock phase detector configured to detect phase alignment between a first clock signal associated with the first clock rate and a second clock signal associated with a second clock rate. The system further includes a read circuit configured to adjust an interpolation time interval in response to the detected phase alignment and to read the frequency values from the memory at the adjusted interpolation time interval. The system further includes a phase accumulator configured to accumulated phase as a sum of the frequency values read from the memory. The system further includes a waveform generator configured to generate an output waveform sample based on the accumulated phase.

Abstract: A navigation device includes a display, an electromagnetic radiation (EMR) receiver, and one or more processors operatively coupled to the display and the EMR receiver. The one or more processors are configured to cause the display, in a first mode of operation, to graphically render a navigation view. The navigation view includes (i) a first informational element relating to a geographic location of the navigation device and (ii) one or both of a compass rose and a geographic map. The one or more processors are further configured to cause the display, in a second mode of operation and responsive to receiving an EMR signal via the EMR receiver, to render an informational view including a second informational element, where the informational view at least partially obscures the navigation view.