Abstract: An impedance matching transformer is disclosed. The transformer includes a conductive ground plane and a dielectric substrate disposed upon the conductive ground plane. The dielectric substrate has a first end and a second end. The dielectric substrate may be of a unitary construction. A conductive current path is disposed upon the dielectric substrate. The height of the dielectric substrate at the second end is greater than the height of the dielectric substrate at the first end.

Abstract: An airborne network configured to simultaneously transmit video imagery for battle damage indication from multiple airborne missiles to multiple tactical airborne non-launch aircraft.

Abstract: A power amplifier apparatus that includes a main power amplifier circuit and an injection power amplifier circuit is provided. The main amplifier includes a pair of quadrature coupled amplifiers. Similarly, the injection power amplifier also includes pair of quadrature coupled amplifiers. The output signal from the injection amplifier is connected to the isolation port of the quadrature coupler of the main amplifier. The input signal is split and applied to the inputs of both the main and injection amplifiers. The gain and phase through the injection amplifier is adjusted in order to vary the magnitude and phase of the signal injected into the isolation port of the quadrature combiner of the main amplifier. By varying the magnitude and phase of the injected signal, the impedance seen by the individual amplifiers within main amplifier can be controlled. Controlling these impedances allows the properties of the main amplifier to be dynamically varied.

Abstract: A method of and apparatus for implementing a radio retransmission bridge is disclosed. The method and apparatus includes devices and operations for creating a retransmission bridge software object with a base class application programming interface (API). The method and apparatus also includes devices and operations for creating waveforms with APIs inherited from the base class retransmission bridge API. The method and apparatus also includes devices and operations for identifying crossbanding waveforms being requested. Further, the method and apparatus include devices and operations for determining a location in a data stack in which to instantiate the retransmission bridge API, and instantiating the retransmission bridge API.

Abstract: A system for controlling the number of iterations to be performed by an iterative decoder. The system includes an input port configured to receive a data throughput value, a processor configured to determine an efficient number of iterations for an iterative decoder based on the data throughput value, and an output port configured to provide the efficient number of iterations based on the determination by the processor.

Abstract: The present invention is an apparatus for efficiently providing an output frequency signal based upon an input voltage. The sampling voltage controlled oscillator of the present invention may include a voltage controlled oscillator coupled with sample and hold circuitry. The voltage controlled oscillator frequency of the sampling voltage controlled oscillator may be a lower frequency whereby the voltage controlled oscillator frequency is sampled by the sample and hold circuitry to derive a higher frequency signal. Advantageously, the overall power consumption of sampling voltage controlled oscillator may be less than conventional voltage controlled oscillators.

Abstract: A phased array antenna is provided having a plurality of phase shifter devices for phase shifting and beam steering a radiated beam of the phased array antenna. The plurality of phase shifter devices are interconnected with an interconnect structure comprising a plurality of linear array substrate slats. Each linear array substrate slat includes a plurality of radiating elements formed using first and second metal layers of the substrate slat, a plurality of phase shifter devices and a common RF feed conductor for the plurality of radiating elements. The common RF feed conductor is formed on a third metal layer of the substrate slat that is disposed between the first and second metal layers. The common RF feed conductor is configured to include a single location for electrical connections to receive RF signals for the plurality of radiating elements.

Abstract: A tailored response cascaded integrator comb digital filter is disclosed which has a cascaded integrator structure, a cascaded comb structure, a first rate change component, a second rate change component and can additionally include a resonator. The improved structure achieves greater bandwidth without requiring higher sampling rates. In an additional embodiment, a pre-decimated cascaded integrator filter section for a cascaded integrator comb digital filter is disclosed as having a data rate change component and a first integrator structure receiving data at the rate established by the data rate change component and modifying the received data. The pre-decimated filter section can also include a second integration structure. The pre-decimate structure outputs data equivalent to data that would be output by a post-decimated cascaded integrator structure having an equal number of cascaded integrator stages.

Abstract: A secondary image suppression system (SISS) for minimizing secondary ghost images in a screen assembly for a rear projection system. The secondary image suppression system includes a circular polarizing assembly positioned to receive light from a rear projection lens of a rear projection system. The circular polarizing assembly includes a linear polarizer and a quarter wave retarder. The linear polarizer and the quarter wave retarder are serially positioned relative to each other and are assembled with a high power Fresnel lens using index matching media such that internal reflections are minimized. The high power Fresnel lens is positioned to receive output from the circular polarizing assembly. During use, light from a projection lens of a rear projection system is introduced through the circular polarizing assembly and through the high power Fresnel lens toward a viewing screen. Any significant secondary ghost images are eliminated by the circular polarizing assembly.

Abstract: A method of displaying areas of turbulent weather is disclosed. Data is processed representative of weather conditions within a predefined area. Weather conditions are displayed on a display. Turbulence is detected within the predefined area. A level of the detected turbulence is detected. First graphical elements are superimposed upon the display of weather conditions when the level of the detected turbulence is less than a predetermined amount. A second graphical element is displayed upon the display of weather conditions when the level of the detected turbulence is more than the predetermined amount.

Abstract: A weather radar signal path for an aircraft. The signal path has an antenna, a digital down-converter, a first transceiver, fiber optic cabling, a second transceiver and a processing unit. The antenna is adapted to, in a first mode, receive reflected radar signals from atmosphere ahead. The digital down-converter is adapted to convert the reflected radar signals received by the antenna into digital radar signals at a lower frequency. The first transceiver is adapted to, in the first mode, at least transmit the digital radar signals through said fiber optic cabling. The fiber optic cabling is adapted to, in the first mode, transfer the digital radar signals between the first and second transceivers. The second transceiver is adapted to, in the first mode, receive said digital radar signals from the fiber optic cabling. The processing unit is adapted to, in the first mode, process the digital radar signals to generate weather information based on predetermined algorithm.

Abstract: A magnitude of radio frequency voltage and current, input into a load from a radio frequency power source, are measured at a single point along a transmission line. Phase difference between voltage and current is also measured. These measurements are used to compute VSWR and forward input power. The computed measurements may be compared against predetermined VSWR limits, and operation of the radio frequency power source can be adjusted to prevent damage to the detection apparatus or load.

Abstract: A dual-band electromagnetic band gap (EBG) electronically scanned antenna utilizing frequency selective surfaces (FSS) uses FSS waveguide phase shifters. Each FSS waveguide phase shifter has a low-frequency phase shifter with low-frequency EBG devices on vertical waveguide walls, horizontal waveguide broadwalls that are substantially twice the width of the vertical waveguide walls and an FSS located at the center of the horizontal waveguide broadwalls. Two high-frequency phase shifters are formed within the low-frequency phase shifter. Each high-frequency phase shifter comprises a vertical waveguide wall, the FSS, half of the horizontal waveguide broadwalls, and high-frequency EBG devices located on each half of the horizontal waveguide broadwalls, The FSS is transparent at a low frequency and opaque at a high frequency.

Abstract: A position sensor for determining the relative physical location of a movable item via a combination of a sensor and an indicator plate affixed to an actuator device.

Abstract: A method of displaying traffic information is disclosed. The method comprises providing traffic information from at least one of a first and a second traffic information system to a traffic display system. The method also comprises choosing to display, by the traffic display system, traffic information from the first traffic information system when no traffic information from the second traffic information system is available. Further, the method comprises choosing to display, by the traffic display system, traffic information from the second traffic information system when no traffic information from the first traffic information system is available. The method further comprises choosing to display, by the traffic display system, traffic information from either the first traffic information system or the second traffic information system using a predetermined selection algorithm when traffic information is available from both traffic information systems.

Abstract: The pseudolite includes a communication (COM) satellite receiver for receiving a communication satellite specific RF signal from a communication satellite and providing communication satellite navigation and position data. A GNSS receiver receives a GNSS signal from a GNSS satellite and provides GNSS timing information. A pseudolite transmitter receives the communication satellite navigation and position data and the GNSS timing information. The pseudolite transmitter includes at least one digital signal generator for utilizing the communication satellite navigation and position data and the GNSS timing information for providing a digital signal generator output having an intermediate frequency and navigation message data which are suitable for up-conversion to a desired communication channel RF frequency.

Abstract: A plurality of imagers, each responsive to a different wavelength range of light radiation, share the same optical system of lenses. An optical film on a substrate is used to split the light beam emanating from the shared optical system. The first wavelength range is reflected by the film to a first imager. The second wavelength range is transmitted through the film and the substrate to a second imager.

Abstract: A method of adapting weather radar thresholds is disclosed. The method comprises generating a location from a location sensor, retrieving information representative of a weather type from a database, based on the location, and adjusting, automatically, the threshold for a radar display based on the information.

Abstract: A liquid crystal display for use in applications where direct exposure to sunlight creates a thermal gradient from the front of the display to the back of the display uses a high efficiency iodine-type input polarizer and a high temperature type output polarizer. The output polarizer has a higher temperature rating than the input polarizer, so that the thermal gradient does not degrade display performance.

Abstract: A traffic alert and collision and avoidance system (TCAS) is disclosed. The TCAS comprises a first transponder and a first interrogator associated with a first aircraft. The first transponder sends an interrogation request. The TCAS also comprises a second transponder associated with a second aircraft. The second transponder responds to the interrogation request. The response comprises enhanced surveillance data that was asked for in the request.