Abstract: A code generation and receiving system for a large bandwidth Doppler tolerant signal for use by communication and radar systems includes a set of delay lines for producing discrete phase shifts on a carrier signal. One delay line with relatively large delays between taps thereon produces a set of quadratic phase shifts approximating a frequency sweep. A second delay line with relatively small delays between taps thereon produces a binary phase code.

Abstract: A launching tube accommodates sonobuoys of differing lengths for individually launching the sonobuoys. Compressed gas modules located between the sonobuoys are individually activated by electrical signals to expel respective sonobuoys from the launching tube. Electrical contacts on the modules engage electrically conducting guides on the inner surface of the launching tube whereby the electrical signals are communicated individually to respective ones of the modules.

Abstract: A procedure for the construction of an internally vaned tube for use as a magnetron anode and as a fluid conductor in a heat exchanger. A set of copper bars is passed through longitudinal slots in a mandrel to form a set of vanes and is then enclosed by counterwound silver plated copper ribbon which forms the tube. The assembly is then brazed and cut to desired length.

Abstract: A circuit for the modulation of the frequency of radiation produced by a magnetron includes a directional coupler connected to the output port of the magnetron, a circulator coupled between the output port and a load, and a phase shifter connected between the directional coupler and the circulator.

Abstract: A communication system for coupling a set of sending stations to a set of listening stations by means of a single communication link employing time compression multiplexing of the messages transmitted from individual ones of the sending stations. A predetermined number of time slots is provided for each of sequentially occurring scans of the sending stations, each slot providing for the transmission of a preset number of data samples. CCD registers are employed with switching circuitry enabling the available slots to be assigned to stations in accordance with the average data rate of a message.

Abstract: A microwave semiconductor device with improved thermal properties is disclosed wherein multiple active semiconductor bodies are disposed between two electrically and thermally isolated heat sinks. Two separate thermal paths are provided for heat produced within the semiconductor material. The maximum operating power of devices such as double-drift IMPATT diodes is greatly extended.

Abstract: In a radar system employing an array antenna and microwave circuitry coupled thereto for developing sum and difference signals, a correction circuit utilizes the sum and difference signals for providing increased accuracy to elevation and azimuthal angle measurements of wide bandwidth radar signals. A correction is applied to the difference signal by subtracting therefrom a weighted time derivative of the sum channel, the weighting being proportional to the boresight error slope and the sines of the elevation and azimuth angles.

Abstract: A system for imaging a subject, such as a human being, in which there has been injected a contrast agent which absorbs radiation of a predetermined frequency. The system utilizes a source of high energy radiation such as X or gamma radiation. The source is a composite of first and second radiating materials each of which is arranged in a predetermined pattern or code, each pattern having both luminous and dark regions. In one embodiment, the luminous regions of one pattern are in registration with the dark regions of the other pattern, these regions being spaced apart in an alternative embodiment. The characteristic frequencies of radiation emitted by the first and second materials are respectively lower and higher than the predetermined absorption frequency. A detector of radiation is positioned relative to the subject and the source such that radiation propagating through the subject is incident upon the detector.

Abstract: A microwave heating system including an articulated waveguide arm for directing microwave energy into a subject to be heated. The articulated arm is positioned by a dual system comprising a sensor of the location of the surface being heated and a computer activated drive mechanism utilizing stored data of the form of the surface of the subject for providing a predetermined scanning path of microwave energy about the subject.

Abstract: A microwave-type device such as a mixer is disclosed having an improved diode mount with the position of the diode within the waveguide determined solely by the position of a contact rod extending into the waveguide on the side of the waveguide opposite the ground contact of the diode. The contact rod mates with the active contact of the diode by an annular spring fashioned at the waveguide end of the rod. The annular spring also provides a stop against which the diode rests thus determining its position. Electrical connection to the ground contact is made through a second annular spring. A coil spring provides longitudinal force holding the diode in position against the contact rod.

Abstract: A magnetron anode is constructed of performed blanks which are bent in two portions of which one portion is a vane and a second portion is a segment of a cylindrical surface of the anode. Alternate blanks are provided with an alternate arrangement of supports for strapping rings of the magnetron anode. The assembly of cylindrical segments is enclosed within a sleeve to which the segments are brazed to provide an air tight wall of the magnetron anode.

Abstract: An imaging system, particularly useful for acoustic medical diagnosis of a human subject, utilizes an array of radiating elements or sonic transducers located side-by-side and positioned along the subject. Signals received by the transducer are applied to a pair of pattern generation circuits which weight the individual signals by factors of +1, -1 or 0. Graphs of the weighting factors as a function of transducer location have the likeness of cosinusoidal and sinusoidal Fresnel patterns, these patterns being produced by the two circuits. The weighted signals of each pattern are summed together, multiplied by cosinusoidal and sinusoidal reference signals and then summed together to provide a radiation pattern which converges from the array to a focal point in front of the array while eliminating a diverging pattern from a virtual focus behind the array.

Abstract: A balanced sonar transducer comprising a front radiating mass and a rear mass coupled thereto via a ceramic transducer element which imparts vibrational motion to the front and the rear masses. The front and the rear masses are secured to a bulkhead via a tie rod which passes through the rear mass and the transducer element and is secured in the front mass. A disc spring is placed between the bulkhead and the rear mass and has a compliance of a suitable magnitude to resonate with the rear mass at a frequency which approximates the resonant frequency of the front mass with the compliance of the tie rod. The approximate matching of the resonant frequencies provides for a balancing of the stresses applied to the transducer element which insulates the transducer element from a vibrational acceleration imparted to the transducer assembly by vibrations of the ship and of the bulkhead to which the transducer assembly is affixed.

Abstract: A system for a phased array antenna including a set of power amplifiers for amplifying the power of a signal to be transmitted by radiating elements of the antenna. A set of hybrid couplers are connected between the power amplifiers and the radiating elements with individual ones of the hybrid couplers being cross-connected for sharing the power of each amplifier among a set of radiating elements. The coupling of power is selectively varied between the amplifiers and the radiating elements by shifting the phase of the signal applied to each power amplifier.

Abstract: An ink feed system for an electrophoretic printer wherein a ribbon is used to carry ink from an ink supply to the paper upon which it is applied by means of an electric field. A magnetic constituent is added to the ink and a magnetic field is impressed alongside the ribbon and parallel to the surface thereof. A Hall probe positioned in the magnetic field senses perturbations thereof perpendicular to the ribbon induced by the presence of ink on the ribbon. A signal produced by the Hall probe signals the density of the ink upon the ribbon and is utilized for regulating a flow of ink onto the ribbon.

Abstract: A radar system including an azimuthally scanned radar wherein the radar receives echo signals during each of a succession of azimuthally scanned directions of the radar receiving beam. Sequences of samples of data of received echo signals are stored with sets of samples relating to a common range being utilized for developing weighting factors for weighting received echo signals as a function of range. Thereby, dynamic fluctuations in signals strength because of clutter are reduced.

Abstract: An electromagnetic wave ring resonator is disclosed wherein means in included for spatially rotating the electromagnetic field distribution of waves resonant therein, such rotation being about the direction of propagation of such waves. With such arrangement the electromagnetic field distribution rotating means provides a phase difference between waves of opposite polarization sense, thereby enabling the waves to resonate with different frequencies. In a four frequency laser gyroscope the electromagnetic field distribution rotating means includes a catoptric arrangement which reduces the loss, scatter and linear birefringence associated with a ring resonator included in such gyroscope.

Abstract: A system for transmitting a signal through a reverberant environment characterized by multipath communication which causes dispersion and fading of the signal. The signal is phase modulated onto a carrier which is also modulated by a repeating series of digital pseudo noise code words. The length of each word is equal to the length of a symbol of the signal and synchronized thereto, individual symbols being of shorter duration than the signal fading time. A receiver views symbols via a selector switch which serves as a window for successively viewing portions of substantially identical reverberation patterns of each symbol. A set of matched filters coupled to the selector switch sequentially demodulates the code words to provide a repeating sequence of pulses of amplitude modulated carrier these amplitude modulated pulses having symbol data thereon and being applied to a delay locked loop for the generation of a reference signal for recovering the symbols.

Abstract: A semiconductor integrated circuit structure wherein a first metal interconnecting system is formed on a semiconductor body having active and/or passive elements formed therein. An insulating layer is deposited on the first metal interconnecting system. Apertures are formed in selected regions of such layer and are cleaned in a sealed sputtering chamber. A refractory metal is deposited over the insulating layer and through the apertures onto the first metal interconnecting system in a sealed sputtering chamber. A lead metal is deposited over the refractory metal layer. Selected portions of such refractory metal and lead metal are removed to form a second metal interconnecting system. With such structure and method the surfaces of the first metal interconnecting system which are to be connected to a second metal interconnecting system through the apertures are cleaned of oxides and other contaminates in a sealed sputtering chamber and are then sealed from further contamination by the refractory metal layer.

Abstract: A system for forming a beam of radiant energy which is incident upon or radiated from an array of radiating elements such as sonar transducers. As a wavefront progresses across the array, samples of signals received by individual ones of the transducers are selected in accordance with specific beams to be formed, the selected samples being summed together through a sequence of partial summations until a complete summation of a sample of a beam is obtained. The sequence of partial summations is initiated successively for each output sampling interval. For a long array, wherein the transit time of a wavefront across the array is longer than the intersample interval, a plurality of the sequences are generated concurrently. All partial sums for all beam samples are generated periodically at the output sampling rate and are stored in a memory.