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: An interposer that enables implementation of a flip-chip die in a wirebonded chip-and-wire circuit assembly includes an insulating substrate having a solder bump pad array on its upper surface that is compatible with the solder bump array of a flip-chip die. Wirebond pads provided along upper edges of the substrate are interconnected to at least some of the solder bump pads. Bonding the interposer to the circuit assembly housing floor, or through an opening to an underlying motherboard, places the wirebond pads proximate attachment points of adjacent wirebond dies, enabling wirebonding therebetween. Attachment pads on the interposer lower surface, in combination with interconnecting traces and vias, can enable connection directly through the housing opening to the underlying motherboard. Support components can be included within an edge cavity created beneath an overhang of a multi-layer substrate. A heat absorbing plate can be attached to the top of the flip-chip die.

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 hybrid electronic warfare and communications system (EW/COMM) eliminates the space, power, weight, and cost of a dedicated communication system by exchanging messages with other nodes in a network as phase modulations of radar jamming signals. Some embodiments impose message phase modulations onto CW jamming signals, while other embodiments interleave message phase modulations with pseudorandom phase modulations of the jamming signals. Message chip rates can be matched to pseudorandom phase modulation chip rates. Messages are thereby obfuscated as either phase noise or random phase modulation of the jamming signals. Messages can be encoded as BPSK or QPSK modulations. Messages can be preceded by pre-established headers known to other nodes, and distinguished thereby from random noise modulations. Some embodiments include a dedicated COMMS module and/or antenna, while other embodiments implement the communications function mostly or entirely in software.

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 shock absorbing apparatus that includes a baseplate adapted to be mounted on a platform, a flexure member that operably engages with the baseplate, and a mounting plate that operably engages with the flexure member. The mounting plate is free from direct engagement with the baseplate and is moveable between a neutral position and a translated position with respect to the baseplate. The mounting plate is also adapted to hold a device. The flexure member is adapted to absorb shock forces caused by a ballistic shock event or a projectile motion event in proximity to or applied on the platform.

Abstract: A Global Positioning System (GPS) digital antenna controller is provided, comprising antenna electronics, a code generator, and an interface. The antenna electronics can be configured to receive a GPS signal. The code generator can be configured to generate a pilot code signal that is synchronized to the DAE local clock reference. The interface can be configured to send the GPS signal and the code signal to a GPS receiver. A system may comprise the GPS digital antenna controller and GPS receiver. The GPS receiver can comprise a second code generator and a processor configured to resolve a timing difference based on the pilot code signal and a second code signal of the second code generator. The controller may be remote from the receiver. The interface may comprise an asynchronous data interface (e.g., Ethernet, USB, Infiniband, or Firewire). To resolve the timing difference may involve GPS code and carrier tracking.

Abstract: A neuromorphic focal plane array ROIC device for temporal and spatial synchronous and asynchronous image event processing comprising a plurality of pixels, each pixel comprising an input section comprising a Sample and Hold (SH) component; a low offset buffer/comparator section comprising a Switched Capacitor Filter (SCF); and a digital event output section comprising an analog pixel bus whereby temporal and spatial image data are synchronously and asynchronously processed.

Abstract: Techniques are provided for an Identification Friend or Foe (IFF) transponder. A system implementing the techniques according to an embodiment includes an antenna array configured to operate in an omnidirectional mode and a steered directional mode. The system also includes a receiver configured to receive signals provided through the antenna array while operating in the omnidirectional mode and a detector configured to detect an IFF interrogation message in the received signals. The system further includes an angle of arrival (AOA) estimator configured to operate the antenna array in the steered directional mode to estimate an AOA of the IFF interrogation message. The system further includes a transmitter configured to operate the antenna array in the steered directional mode to transmit an IFF response message in the estimated AOA direction. The transmit power of the IFF response message may be based on, for example, the steering gain of the antenna array.

Abstract: Techniques are provided for batch processing signal acquisition. A batch processing signal acquisition system implementing the techniques according to an embodiment includes a recording controller configured to store samples of an input signal to a memory. The input signal is received at a first sampling rate. The system also includes a playback controller configured to read samples from the memory for playback of the input signal at a second sampling rate. The system further includes an acquisition processor configured to detect and locate, in time and frequency, a signal of interest in the playback of the input signal. The system further includes a signal processor configured to process the signal of interest in the playback of the input signal based on the detection and location provided by the acquisition processor.

Abstract: The disclosed method enables efficient registration and correction of random vertical and horizontal offsets of a plurality of images of a feature to enable combination thereof with maximum noise suppression. The method includes obtaining image cross correlations and estimating correlation peaks. If a correlation peak cannot be uniquely determined for a given correlation, all candidates are retained. An improved robust weighted regression is applied thereto to obtain estimates of the image shifts. Dimensional symmetry is exploited to remove redundancy from the weighted normal equation, and computational requirements are further reduced by analytically determining the coefficients matrix and the inhomogeneous matrix, thereby circumventing conventional computations. Solution of the resulting consistent, full rank, linear system requires only matrix inversion. For N images, the present method thereby increases computation speed and reduces storage by approximately N2.

Abstract: A system and method is provided to characterize optical properties (Scattering, attenuation, de-polarization) of a light-transmitting medium and local environment, by determining a scattering rate of light through a medium, wherein determining the scattering rate of light through the medium is accomplished by utilizing polarized light transmitted from an optical source. The system and method performs a function based on the characterized optical properties of the medium, wherein the function is one of, for example: detection of objects embedded in the medium, object ranging through the medium, or deblurring of images acquired through the medium.

Abstract: Techniques for jointly estimating geolocations of a plurality of emitting targets. An example method includes acquiring a plurality of bearing measurements, establishing a search grid based on the bearing measurements, performing a joint maximum likelihood optimization procedure on the bearing measurements over the search grid to produce an estimated geolocation solution by solving a nonlinear multi-target geolocation description function for all targets associated with a current rank, repeating the joint maximum likelihood optimization procedure set successive ranks until a maximum rank is reached, evaluating the estimated geolocation solution sets for each rank to determine a number of targets, based on the number of targets, selecting the corresponding geolocation solution set for the rank corresponding to the number of targets, and processing the selected corresponding geolocation solution set to produce a geolocation result that includes an estimated location of each target.

Abstract: A 3D-printed reflective optic providing very high specific stiffness through the utilization of a hollow shelled design, with closed back, filled with high-stiffness internal volumetric space-filling open-cell lattice structures. Structurally-integrated sacrificial structures are included for the purposes of reduction or elimination of tooling during post-processing operations.

Abstract: A microelectronic component includes a substrate having at least one electrical pad, a resilient material on the substrate, and a conductive element on or in the resilient material and coupled to the at least one conductive pad. The resilient material may include, for instance, a compressible polymer. The conductive elements configured to be placed in contact with at least one test probe, where the resilient material is configured to be compressed by the at least one electrical probe into a deformed shape and where the resilient material is configured to return from the deformed shape to a non-deformed shape subsequent to a removal of the conductive element from contact with the at least one electrical probe.

Abstract: Techniques are provided for estimation of relative velocity between a receiver platform and a transmitter platform. A methodology implementing the techniques according to an embodiment includes measuring a first time of arrival, a first phase, and a frequency of a first radar pulse received from the transmitter platform. The method also includes measuring a second time of arrival and a second phase of a second radar pulse received from the transmitter platform. The method further includes calculating a relative velocity between the receiver platform and the transmitter platform based on a difference between the first time of arrival and the second time of arrival, a difference between the first phase and the second phase, and the frequency. The method further includes calculating an angle of arrival of the first and second received radar pulses based on a ratio of the calculated relative velocity to a velocity of the receiver platform.

Abstract: A low SWAP-C apparatus and method enable determining precise location and orientation in a GPS-denied environment. A camera image of a scene is registered to a synthetic image predicted according to an initial estimate of location and orientation and a 3D model of the environment to obtain an accurate cross-plane location estimate perpendicular to the camera pointing direction, and an approximate downrange location in the pointing direction. A range sensor is then used to correct and refine the downrange estimate. The steps can be iterated until a required accuracy is attained. The camera can be an electro-optical or infrared imaging system. The range sensor can be a laser range finder or a LIDAR. The initial location estimate can be based on inertial measurements and/or earlier GPS readings. The registration can include applying a photogrammetric bundle-adjustment process. The disclosure is applicable to navigation, weapons pointing, and situational awareness.

Abstract: High power monolithic microwave integrated circuit (MMIC) differential single pole double throw switches utilizing a series of transistors formed by a gallium nitride (GaN) foundry process. The differential switches of the present disclosure allow for larger power handling capability and wideband operation while further providing differential amplitude and phase matching.

Abstract: An apparatus includes a lower plate, an upper plate above the lower plate, and a plurality of vias extending from the lower plate to the upper plate. The lower plate, the upper plate, and the plurality of vias include conductive material. A post including conductive material extends from the lower plate and towards the upper plate. An inner plate including conductive material is above and in contact with the post, where the post and the inner plate are separated from the upper plate by dielectric material. The plurality of vias are arranged to at least in part wrap around the post. A signal line extends between the lower and upper plates and at least in part wraps around the post, where the signal line extends through an opening between a first via and a second via of the plurality of vias. In an example, the apparatus is a resonator structure.

Abstract: An optical detection system uses high-resolution holographic filters for target detection within a very-large field of view image acquired with a reflector. The holographic filter acts as an optical computer, mixing phase and amplitude information of known targets with light from the scene, automatically enhancing portions of the image that match threat objects or other object of interest. A lens forming a Fourier transform of the entire scene is used, and within that transform, the holographic information of a target or multiple targets is added. By acting as an inverse optical transfer function, the hologram gathers the target information to single point, and removes non-target background. Amplification is done by using a laser-illuminated hologram to create a phase-amplitude filter in a photorefractive material at the transform plane. By mixing the hologram and the scene at the transform plane, the matching is enhanced regardless of target location in the scene.