Abstract: An antenna includes one or more conductive elements for acting as radiating antenna elements, and a slow wave meander line adapted to couple electrical signals between the conductive elements, wherein the meander line has an effective electrical length which affects the electrical length and operating characteristics of the antenna. The electrical length and operating mode of the antenna may be readily controlled.

Abstract: An apparatus and method are described for direction finding the source of emf emissions including a monotone signal by detecting the phase changes of the monotone signal during movement relative to the source. A software embodiment measures the amount of phase change.

Abstract: The present invention provides a method for producing single crystals of a group II-IV-V.sub.2 and group I-III-VI.sub.2 compounds by synthesizing compound material from its constituents and separately melting and refreezing the material in a transparent furnace while observing crystal growth.

Abstract: The present invention provides a radiant energy activated semiconductor control device having N+ ion implanted regions exposed to the radiant energy for switching purposes.

Abstract: A method for determining the time difference of arrival, tdoa, of signals from a cellular telephone, includes determining tdoas for a plurality of channels, averaging the tdoas from the channels, subtracting the average tdoa from the individual channel tdoas to determine residual channel tdoas and determining an overall residual tdoa from the residual channel tdoas. An apparatus and method for collecting cell phone transmission signals for performing tdoa calculations, includes receiving, digitizing and temporarily storing wideband transmission signals while monitoring a known reverse control channel for a predetermined cell phone number to be located, and permanently storing the delayed reverse control channel signal once the predetermined number is identified.

Abstract: A dielectric resonator comprising a resonant defect structure diposed in a lattice structure formed of a plurality of multi-dimensional periodically arranged dielectric elements confines electromagnetic energy within a frequency band in the photonic band gap. The frequency band of the confined electromagnetic energy is tunable. The unique structure of the dielectric resonator leads to reduced power dissipation losses when used in microwave and millimeter wave components. Accordingly, the dielectric resonator may be used to produce high quality resonant cavities, filters and power generators.

Abstract: This invention is a parachute array in which a plurality of hydrophones are attached to the skin of a planar or volumetric parachute or affixed to strings that are positioned around a planar or volumetric parachute. When the parachute is moved through water, the parachute will expand and provide the necessary tension forces to maintain and position the hydrophone array in a particular geometric orientation without the use of any rigid structural members.

Abstract: A method and apparatus for highlighting returns from optically augmented targets includes in one embodiment a receiver, a viewing device coupled to the receiver and first and second illuminators. The first illuminator is arranged on axis with the receiver and the second illuminator is placed off-axis therefrom. Means are provided for switching on alternately the illuminators such that returns of the first illuminator through retroreflection from high quality optical targets will enter the receiver, while retroreflection returns of the off-axis illuminator will not enter the receiver; therefore the retroreflected returns from high quality optical targets will appear to flicker when seen on the viewing device and thus be highlighted above the rest of the scene.

Abstract: The present invention relates to signal processors and processing, and more particularly to apparatus and method for sensing, detection and/or demodulation of frequency hopping signals.

Abstract: The present invention provides a monolithic integrated detector array for detecting both infrared, IR, and millimeter wave, MMW, energy. Elements include an integrated circuit substrate having both IR sensing elements and MMW antenna elements formed within a predetermined area thereon, said IR sensing elements including a first multiplicity of IR sensing elements substantially evenly distributed across the predetermined area of the substrate, said MMW antenna elements including a second multiplicity of antenna elements distributed over the predetermined area with individual antenna elements being located between individual IR sensing elements; and lens means substantially covering the predetermined area for collecting substantially all of the IR energy incident thereon and for distributing collected IR energy to the multiplicity of IR sensing elements, said lens means being adapted to be substantially transparent to MMW energy incident upon the predetermined area.

Abstract: An apparatus for transforming a voice signal of a talker into a voice signal having characteristics of a different person provides apparatus for separating the talker's voice signal into a plurality of voice parameters including frequency components, a neural network for transforming at least some of the separated frequency components into those characteristic of the different person, and apparatus for combining the voice parameters for reconstituting the talker's voice signal having characteristics of the different person.

Abstract: Apparatus for determining position within a beam, comprising pulses of energy transmitted in coded patterns, is achieved by processing the signals received from the beam to generate a value indicative of coarse position within the beam and by interpolation within the coarse position to generate a value resolving fine position within the coarse position.

Abstract: A filter utilizes a frequency selective, non-conductive, dielectric structure for filtering electromagnetic energy in the millimeter to far infrared frequency bands. The filter includes a non-conductive, high-dielectric, background material positioned to receive incident electromagnetic energy. A lattice structure comprised of a plurality of elongated elements formed of a non-conductive, high-dielectric material are disposed in a two-dimensional, periodic arrangement in the background material. The elements extend in parallel to one another through the background material for providing a range of frequencies over a band gap in which incident electromagnetic energy within the frequency range of the band gap is substantially prevented from propagating through the lattice structure. The dielectric structure can be adapted to operate as a band stop filter or a low pass filter.

Abstract: An outer product neural network provides a predetermined number of processing elements for extracting principal components of an input vector. The residual vector of the network when cascaded into a similar outer product neural network provides additional principal components defining a subspace orthogonal to the subspace defined by the principal components of the first network.

Abstract: A monolithic integrated circuit power sensor provides a monolithic integrated circuit substrate a conversion element formed either on or in the substrate for converting microwave energy into heat, an electrically insulating dielectric layer affixed to the conversion element, and an integrated circuit, heat sensitive element formed in sufficiently close proximity to the conversion element to be thermally coupled thereto through the dielectric layer for sensing temperature changes in the conversion element.

Abstract: Improved radar system performance in a jamming environment is achieved by detecting the AM difference frequency produced by the beating of the desired radar signal with the jamming signal and applying same to one input of a balanced modulator while simultaneously applying the received signal (containing both the desired radar signal and the jamming signal) to the other input of the balanced modulator whereby the output from the balanced modulator contains the desired signal but not the jamming signal.

Abstract: The input ports (18) of an imaging compressive receiver (20) receive from a tapped delay line (16) progressively delayed versions of a received signal s(t). Because of the delays, a signal component in the received signal appears at least at one of the input ports (18) of the compressive receiver (20) at a time when the compressive receiver (20) will detect it, even if the undelayed version occurs during a time at which the compressive receiver (20) would ordinarily be insensitive to it. Since the compressive receiver (20) is an imaging device, it provides relatively isolated channels between its input terminals (18) and its output terminals (38). The phase relationships between the delays in these channels remain constant despite changes in environmental factors, however, because the various channels are embodied in a common two-dimensional delay line.

Abstract: A system for storing and deploying a number of elements sequentially in connected but spaced-apart relationship is described. Adjacent elements are joined together temporarily by connectors which overlay adjacent elements. The connectors are bound to the elements by a plurality of cables, one of which is wound around each element and the overlying connectors. One end of each cable is connected to the element around which it is wound and the other end is connected to the next preceding element. When tension is applied between the cable of the first element and the last element, for example, by connecting an underwater tug to the cable and connecting a drogue to the last element, the cables unwind one by one releasing the connectors and extending the elements in a straight line, spaced apart by the length of the connecting cables.

Abstract: A monolithic integrated circuit power sensor provides a monolithic integrated circuit substrate, a conversion element formed either on or in the substrate for converting microwave energy into heat, and a thermally sensitive diode junction formed in sufficiently close proximity to the conversion element to be thermally coupled thereto.

Abstract: An acoustic transducer provides an elongated outer shell made of magnetic material and having a pair of flexural members attached to each other in the elongated direction and having a flexural portion extending normally to the elongated direction and forming a partial enclosure between the two flexural portions, and a magnetic drive located within the partial enclosure and engaging the flexural portions for causing the portions to oscillate flexurally.