Abstract: Concentrating particles in a turbulent gas flow may include receiving, in a receptacle, a turbulent gas flow that includes particles. The concentration of particles in a gas flow exiting the receptacle at a first port is increased as compared with a concentration of the particles in the gas flow received by the receptacle. The increased concentration of particles is accomplished by removing a portion of the gas flow by using a second port, and fluidly communicating the gas flow through a tube in the receptacle. The tube has a smaller diameter at the end of the tube at which the gas flow exits the tube than diameter at the end of the tube at which the gas flow is received.

Abstract: An Automatic Dependent Surveillance-Broadcast (ADS-B) system for an aircraft and method of automatically harmonizing a transponder squawk code and an ADS-B system such that a squawk code broadcast by the ADS-B system matches the transponder squawk code, includes transmitting the transponder squawk code from a transponder positioned onboard an aircraft and receiving the transmitted transponder squawk code with a device positioned onboard the aircraft. The ADS-B system is updated with the received transmitter squawk code. The squawk code is transmitted using the ADS-B system.

Abstract: An electronically reconfigurable battery includes a number of battery modules selectively interconnected by a number of electronic switches, wherein a selectable number of battery modules may be connected either in a series configuration or in a parallel configuration, as a result of placing selected switches of said plurality of switches in open states or closed states. In a parallel configuration, the battery provides power to a primary load, such as a propulsion load for a vehicle. In a series configuration, the battery is configured to provide a high voltage and high power output to a short-term and/or pulsed load, such as an additional load provided on the vehicle.

Abstract: Sampling may be employed to cancel an analog input radio frequency (RF) signal by using an upconverted analog cancellation RF signal to cancel the analog input RF signal at the sample instances. At least two sampling paths may be employed, a signal path and a cancel path, and direct RF bandpass sampling may be included in both the signal and cancel paths.

Abstract: Systems and methods for interference cancellation in which a first signal having a first frequency may be cancelled with a second frequency having a second and different (e.g., lower) frequency by employing sampling to cancel the first signal with the separate signal at the sample instances.

Abstract: A hermetically packaged integrated optical circuit includes an integrated optical circuit and a hermetically sealed container, which defines a volume. The integrated optical circuit is secured within the volume. The hermetically packaged integrated optical circuit further includes a fill gas comprising oxygen disposed within the volume of the hermetically sealed container.

Abstract: An apparatus and method for correlating a signal over a correlation interval while accommodating spreading code frequency offset is described. In one embodiment, the apparatus includes a plurality of correlators, where each correlator forms a correlation result corresponding to a unique code frequency offset hypothesis. Each correlator selects samples from a tapped delay line at a tap position moved along the delay line at a rate corresponding to the correlator unique code frequency offset hypothesis.

Abstract: A fusion night vision system corrects for parallax error by comparing an image from a first sensor with an image from a second sensor.

Abstract: A source controller provides a block of n×a information bits as n separate rows each with a information bits. A row encoder has an input coupled to an output of the source controller and includes a plurality of accumulators arranged to process m of the information bits in one clock cycle to generate row forward error correction FEC bits. At least one column encoder has an input coupled to an output of the source controller and is arranged to generate column FEC bits in parallel with the row encoder. A multiplexer is coupled to outputs of the row and column encoders and is adapted to serially output an nth row of information bits followed by the nth row FEC bits for each of the n rows, followed by additional rows of FEC bits generated by the column encoder. The terms n, m, and a are integers greater than one. Where more than one column encoder is used, there are preferably m column encoders in parallel and each operating at one bit per clock cycle.

Abstract: According to an aspect of the invention, a system for providing immersive surveillance a site has a plurality of cameras each producing a respective raw video of a respective portion of the site. A processing component receives the raw video from the cameras and generates processed video from it. A visualization engine is coupled to the processing system, and receives the processed video therefrom. The visualization engine renders real-time images corresponding to a view of the site in which at least a portion of the processed video is overlaid onto a rendering of an image based on a computer model of the site. The visualization engine displays the images in real time to a viewer. The processing component comprises first and second filter modules. The second filter module processes video received as output from the first filter module. A controller component controls all transmission of data and video between the first and second filter modules.

Abstract: A property of a treatment beam is controlled during a scanning period. A portion of a region is exposed to an imaging x-ray beam during a scanning period, the imaging x-ray beam being generated by an electron-beam scanner. X-ray radiation from the region is detected, the x-ray radiation representing an attenuation of the imaging x-ray beam caused by the portion of the region. A first image of the portion of the region is generated based on the detected x-ray radiation. A characteristic of the portion of the region is determined from the generated first image. An input derived from the characteristic is generated, the input configured to cause a source of a treatment beam to modify a property of the treatment beam. The source of the treatment beam modifies a property of the treatment beam during the scanning period by providing the input to the source of the treatment beam.

Abstract: An object within a region is exposed to a first beam of penetrating radiation. The first beam of penetrating radiation is sensed on a side opposite the region from a source of the first beam. An attenuation of the first beam caused by passing the first beam through the object is determined, the attenuation is compared to a threshold attenuation. If the attenuation exceeds the threshold attenuation, a parameter of a second of beam of penetrating radiation is adjusted based on the determined attenuation.

Abstract: An electrical connector for electronics applications such as avionics or the like includes an adaptable strain relief feature for accommodating different sizes of wire bundles that terminate and are electrically coupled within the connector. The strain relief feature includes a pair of clamping members that span between mounting surfaces at a rear portion of the connector to define a strain relief passageway in which the wire bundle is clamped to provide a strain relief. The clamping members are selectable from at least two different available shapes so that the size of the strain relief passageway is determined by the selection of clamping members, which may be interchangeable with one another. Resilient pads on the clamping members engage and compress against the wire bundle to secure it in place when the selected clamping members are installed.

Abstract: A method and system for determining the suitability of a particular location on a mobile craft for mounting a magnetometer includes positioning a magnetometer in a particular location. The magnetometer including at least one output indicating magnetic measurements made by the magnetometer. A computer is connected to the magnetometer and programmed to monitor the output(s) of the magnetometer. An attempt is made to detect magnetic interference at the mobile craft and a human-perceptible indication is provided if the output(s) of said magnetometer changes by more than a specified amount while attempting to detect magnetic interference.

Abstract: A method of transmitting a spread spectrum signal in a single communication session between a transmitter and a receiver, stores a series of N unique waveform designs and a hopping sequence in a transmitter memory. A signal is transmitted to a receiver according to the hopping sequence using the plurality of N unique waveform designs. Preferably, each waveform design is characterized by a unique composite spreading code that is formed by at least some of a plurality of constituent code segments. Alternatively or additionally, the waveform designs may differ by any one or more of code length, symbol or chip timing or phase, frame or burst structure, chip offset, modulation, error control coding, encryption scheme, or scrambling code. A transmitter and receiver are also disclosed, as is the concept of appending chips between symbols to expand the universe of unique spreading codes without incurring an increase in processing gain.

Abstract: The application discloses a system and methods for remote access and analysis of data collected about items under inspection. The system includes one or more data collection stations, each of which may include an X-ray scanner that scans the items under inspection to obtain data about the items. The data is transmitted to one or more remote stations, where the data is remotely analyzed to determine whether the item contains a potential threat, such as, for example, explosives or other contraband. Data may be aggregated so that correlations between data collected for different items may be used to more accurately detect threats.

Abstract: An object within a region is exposed to a first beam of penetrating radiation. The first beam of penetrating radiation is sensed on a side opposite the region from a source of the first beam. An attenuation of the first beam caused by passing the first beam through the object is determined, the attenuation is compared to a threshold attenuation. If the attenuation exceeds the threshold attenuation, a parameter of a second of beam of penetrating radiation is adjusted based on the determined attenuation.

Abstract: Physical layer quality of service is provided for a wireless communication system by operationally adapting the physical layer format to the quality of service requirements of transmitted data. The physical layer formats for the data packets are selected based on the quality of service requirements of the data packets. Control information defining the formats is transmitted across the wireless communication link and the data packets are transmitted using the selected physical layer formats.

Abstract: An output circuit for a microwave tube is provided that has generally high interaction impedance for good efficiency, has high average power capability, and is physically large for a given operating frequency. The output circuit is designed to operate in conjunction with an off-axis, bunched electron beam. Electromagnetic fields are applied to the region in which the electron beam propagates to impart an azimuthal velocity to the bunched electron beam. The electron bunches then interact synchronously with a resonant output structure to excite radio-frequency modes from which energy can be extracted and applied to a load.

Abstract: In one aspect, an apparatus includes a head configured to receive a pad for sampling explosive residue on a surface and a feedback system coupled to the head. The feedback system is configured to indicate when a pressure applied by the head is greater than a minimum threshold value. In another aspect, an apparatus includes a head configured to receive a pad and rotate to apply a shear force to the pad for sampling explosive residue on a surface. The apparatus includes a feedback system coupled to the head, which is configured to restrict the shear force applied by the head to be within a predetermined range. In another aspect, a method includes applying pressure to a pad to sample explosive residue on a surface, sensing the pressure applied to the pad, and providing an indication of when the pressure applied to the pad is greater than a threshold value.