Abstract: A system and method are provided for review of a trainee being trained in simulation. The system has a computerized simulator displaying to the trainee a real-time out-the-window (OTW) scene of video made up of a series of images each rendered in real-time from stored scene data. A review system stores or displays a view of the OTW scene video as seen from a time-variable detected viewpoint of the trainee. Each frame of this video is independently rendered in a single pass from the scene data using a projection matrix that is derived from a detected eyepoint and line of sight of the trainee. A HUD display with imagery superimposed on the OTW view may advantageously combined with the perspective-distorted imagery of the review system. The video displayed or stored by the review system accurately records or displays the OTW scene as seen by the trainee.

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: A method for asynchronous transmission of communication data between periodically blanked terminals separated by an unknown distance is disclosed. A bursted signal is transmitted from a first terminal with a burst time tB and a burst cycle period T. The bursted signal is received at a second terminal. A bursted response signal is transmitted from the second terminal to the first terminal. The bursted response signal has a burst cycle period of T/2 and includes a pair of response bursts, with each burst in the pair having a burst time tA?T/2?tB. Each burst in the pair of response bursts carries an identical data payload. At least one of the response bursts is received at the first terminal.

Abstract: A surveillance system is disclosed. In some embodiments, the surveillance system may include at least one controller configured to receive information data from at least one upstream information source and to control operation of at least one controllable downstream information source based, at least in part, on the information data. A surveillance method also is disclosed. In some embodiments, the method may include analyzing screening data, obtaining information data, and reanalyzing the screening data based, at least in part, on the obtained information data.

Abstract: A user portable viewing device includes a plurality of non-coaxially aligned sensors for sensing a scene. A processing element combines electronic images into a single electronic image. A display displaying the combined electronic image is adaptable for mounting in an optical axis including an eye of the user and an input end of the first sensor for direct view. In a second embodiment, a system for fusing images comprises sensors for generating sets of image data. An information processor receives and samples the sets of image data to generate sample data for computing a fused image array. A display receives the fused image array and displays a fused colorized image generated from the fused image array.

Abstract: Sensing moving entities includes transmitting a stepped-frequency radar signal including multiple frequencies through a wall from a first side of the wall to a second side of the wall. Portions of the radar signal that are reflected by entities located beyond the second side of the wall are detected. The reflected portions are processed to generate processed data including information associated with frequency shifts between the transmitted signal and the detected signal. The processed data is analyzed to determine if reflected portions are associated with moving entities.

Abstract: A device includes a compressible conductive element including a first end and a second end, and an adjustment element coupled to the compressible conductive element, the adjustment element configured to adjust the compressible conductive element to a state of compression between an uncompressed mode and a compressed mode. The compressible conductive element is configured to couple to a source of electrical current at the first end and to radiate electromagnetic energy from the second end.

Abstract: Energy released from energized particles is sensed. Whether the energized particles include a possible energetic material is determined based on the sensed energy. If a determination is made that the energized materials include a possible energetic material, a spectral signature of the sensed energy is determined. The spectral signature of the sensed energy is compared to one or more known spectral signatures associated with energetic materials. Whether the possible energetic material is an actual energetic material is determined based on the comparison.

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: Entry of a terminal into a wireless communications network is facilitated for terminals which may operate in either frequency-division duplex or time-division duplex mode. Join request messages transmitted by the terminals include a duplex capability indicator defining a carrier frequency which can be used to response to the terminals.

Abstract: A flight display system provides advanced, or previewed, indications of the aircraft's position relative to an approach via a primary flight display. The primary flight display displays one or both of horizontal and vertical deviation indicators with respect to the aircraft's current position prior to the aircraft reaching the final approach. A feature of the horizontal and vertical deviation indicators may change on the primary flight display when the aircraft reaches the final approach, such as their color. The display system may also include an approach annunciator that provides an indication of the type of approach and the navigation source for the approach. The approach annunciator is displayed prior to the final approach becoming the active leg of the flight plan. The previewed information may appear automatically on the primary flight display based upon a distance of the aircraft to the airport or runway.

Abstract: A volumetric image of a space is acquired from an imaging system. The space includes an object of interest and another object, and the volumetric image includes data representing the object of interest and the other object. A two-dimensional radiograph of the space is acquired from the imaging system. The two-dimensional radiograph of the space includes data representing the object of interest and the other object. The two-dimensional radiograph and the volumetric image are compared at the imaging system. A two-dimensional image is generated based on the comparison. The generated two-dimensional image includes the object of interest and excludes the other object.

Abstract: An apparatus that includes a traveling-wave tube having an electron gun having a cathode. The apparatus also includes a first power supply for establishing a first electric potential between the cathode and an anode and for providing an operational current to the cathode to generate a beam of electrons. The apparatus also includes a slow-wave structure having a passage through which the beam of electrons passes. The apparatus also includes a second power supply for providing a voltage to a beam focusing electrode to establish an electric potential between the cathode and the beam focusing electrode. The apparatus also includes a switching module coupled to the first power supply and the second power supply, the switching module providing a current path between the cathode and the beam focusing electrode, wherein the current path is disabled when a biasing current is below a predetermined level.

Abstract: A system and method for parallel Pseudo-random Noise (PN) code generation is disclosed. The method includes the operation of producing a PN code sequence having a predetermined length. The PN code can be divided into L segments. At least one of the L segments can have a length less than other segments. The L segments can be distributed into an array of L digital memories. Each of the digital memories can output every Lth chip of the PN code in parallel at a selected rate. An element of the PN code can be substituted from an element substitution cache into the output of the L digital memories to compensate for segment(s) having a shorter length.

Abstract: An emergency locating system can include emergency transceivers and rescue transceivers. The emergency transceivers can be capable of repeat transmission of a distress message using a variable power level and variable spreading factor. A receive transceiver can be capable of receiving the distress messages and sending a confirmation message to the emergency transceiver. The emergency transceiver can be capable of receiving the confirmation message and terminating transmission of the distress message.

Abstract: A method and system for displaying three dimensional images of runways and terrain, as well as additional information, on one or more screens of an avionics display system is provided. The system merges elevation information for terrain points and elevation information for runway points by grouping runways together that are within a threshold distance of each other. For each group, a plane is calculated. The calculated plane is then projected onto all of the runways within the group. The plane may also be projected onto a subset of neighboring terrain points. The adjusted elevation created by the projection of the plane are then used in creating the images for display on the synthetic vision display. The result is that all of the runways within a group, along with their neighboring terrain, are displayed as being coplanar.

Abstract: A system installed in an aircraft automatically retrieves and displays approach minimum data to the pilot, thereby relieving him or her of the burden of searching for the desired information. The display of the data may take the form of a complete or partial image of a published approach chart. In a variation, the system may both automatically retrieve and automatically enter the desired data into the flight plan, thereby relieving the pilot of both the searching and data-entry tasks. The system may include a database, a screen, a control, and a controller.

Abstract: A surveillance system may include at least one controller configured to receive information data from at least one information source and to control operation of at least one controllable subsequent information source based, at least in part, on the information data. A surveillance method may include analyzing screening data, obtaining information data, and reanalyzing the screening data based, at least in part, on the obtained information data.

Abstract: A system and method for designing a full duplex communications transceiver to enable a reduction in isolation between a transmit signal and a receive signal at a diplexer is disclosed. An RFE transmit filter attenuation level can be determined to be sufficient to attenuate a noise power of the transmitter below a thermal noise floor of the power amplifier. A minimum diplexer transmit filter attenuation level can be calculated to attenuate noise power output from the power amplifier in the receive band to a level below a noise floor of the receiver.

Abstract: A compact integrated waveguide load has a load section disposed within an interior region of the waveguide proximate to a closed end of the waveguide. The load section has a tubiform shape, with an exterior surface congruent with an interior surface of the waveguide and an interior surface defining a circumferential step within the waveguide. A method of making a compact integrated waveguide load includes providing a waveguide and placing electromagnetic wave absorbing materially circumferentially around the interior surface to create an inward step.