Abstract: A clutter tracker in which received clutter velocity signal is shifted to zero doppler in order that optimum moving target indicator (MTI) cancellaton can be achieved is disclosed. A frequency controllable voltage controlled crystal oscillator (VCXO) is used as the coherent oscillator (COHO) source. The subject digital system changes the VCXO output bus only once per dwell, thus allowing adequate filtering to achieve desired performance without adversely affecting tracking performance.

Abstract: An electronic system providing discrete mathematical transforms includes a charge-coupled transversal filter, a pair of sample and hold circuits connected to the output of the filter, and a differential amplifier connected to the outputs of the pair of sample and hold circuits. An analog-to-digital converter is connected to the output of the differential amplifier. A transmitter of intelligence is connected to the output of the analog-to-digital converter for sending compressed intelligence via a data link.

Abstract: A polarization reference imaging system to determine image of a target comprises three basic major elements. Such elements consist of transmitting means, a matrix of receiving systems and digital processing circuitry. The transmitting means consists of a transmitter and suitable optics for electromagnetically illuminating a target. The receiving systems consist of a matrix of receivers electromagnetically coupled to the target for receiving energy as reflected signals due to illumination of the target which signals are passed by the receiver substantially devoid of atmospheric distortion components. Each of the receivers of the receiving system provide a different weighting factor insofar as amplitude of the received signals is concerned, thereby enabling to obtain not only the shape of the target but also the various intensities of grays, blacks and white of the illuminated target. The digital system is connected for processing the received signals.

Abstract: An electromechanical micropositioner for making minute angular and linear translational displacements of an element attached to same. The micropositioner employs electrical control potentiometers, a power source, and a signal source that provides for the type of displacement desired.

Abstract: An amplifier circuit, comprising a capacitive-resistive network electrically connected between the input and output of the amplifier wherein the network provides equivalent capacitance between the input and output thereby providing frequency response compensation.

Abstract: An antenna is connected to a surveillance sensor feeding a target detector. The target detector provides multiple inputs of target reports, azimuth, range and scan count data to a clutter mapper circuit which in turn feeds a track-while-scan circuit one output of which is fed back to a data input buffer also feeding the clutter mapper circuit. Another output of the track-while-scan circuit provides input to a CRT display.

Abstract: A high voltage glow discharge power source providing a plurality of glow discharges by gas ignition within at least one elongated electrically insulating member having a central bore along the axis of elongation of the member. Electrodes are positioned along the outer surface along the length of the member to which current sources and sinks are connected in alternation. A DC power supply provides the energy for the current sources and sinks. End plates covering the bore are transparent to optical frequencies. Glow discharges occur within the bore so that when a laser generator beam is diverted into the bore through the end plates, the gas in the bore being ignited to provide the glow, discharges and effects a power gain in the laser signal at the other end of the bore.

Abstract: This disclosure shows a technique used for obtaining high-resolution imagery at infra-red and optical wavelengths in the presence of atmospheric turbulence. The technique uses multi-channel signal processing. Squaring circuits are utilized to obtain the squared functions of the sum and difference frequencies, structured so as to avoid atmospheric turbulent effects upon received signals. This technique is suited for imaging of objects located above the turbulent boundary layer near the earth's surface.

Abstract: A tile, generally used for roofing purposes, made of metal or synthetic material, has two portions, one portion has a convex upper surface and another portion has a concave upper surface. These portions are integral with each other and do not overlap one another. The underfaces of these portions exhibit cavities thereat. The length of one of the portions is greater than the length of the other portion. When laid upon a roof area the ends of the tiles will be made to overlap a predetermined length of the tile to give the appearance of a roof formed with conventional spanish mission tiles. Adjacent or contiguous tiles are interlocked by means of a curled corner of the other portion of the tile.

Abstract: A radar set for providing accurate low elevation angle tracking of targets by means of controlling the magnitudes of radar detection level which are sequentially switched so that either of a pair of beams is greater in magnitude than is used for two beam tracking.

Abstract: Suspension members, terminating in a hangar, have couplers fitted at their other ends for interlocking a tray. Additional couplers provided with additional like suspension members, or similar such members, may be interlocked with the original couplers used to suspend another tray below the first tray, and so on with still more trays in modular suspension configuration possible to provide a hangar for potted plants, for displays for art objects, and the like.

Abstract: A high voltage glow discharge power source providing a plurality of glow discharges by gas ignition within an first elongated member, which member has a central bore along the axis of elongation of the member. A second member used in an E-gun application having a cavity with a soft vacuum in the cavity, and a third similar member parallel to the second member and a common interface boundary between the second and third members. Electrodes are positioned along the outer surface along the length of the first member to which current sources and sinks are connected in alternation. The second member has a common wire running its length with auxiliary wires connected to the common wire which are connected in turn to the sources and sinks. A DC power supply provides the energy for the current sources and sinks used with the first member. End plates covering the bore of the first member are transparent to optical frequencies.

Abstract: Broad, intermediate, and narrow field of view infrared telescopes, broad and narrow field of view visual telescopes, and a narrow field of view laser telescope, together with apparatus for boresighting said telescopes, all of the narrow field of view telescopes having a common objective lens with means for separating the optical pathways.

Abstract: A liquid crystal device biased by an alternating current having a predetermined frequency higher than the dispersion frequency of the liquid crystal material. The liquid crystal device exhibits inherent capacitance across its input terminals which is resonated by an inductor to result in a higher bias current and reduction of image smear of images displayed by such device.

Abstract: Broad, intermediate, and narrow field of view infrared telescopes, broad and narrow field of view visual telescopes, and a narrow field of view laser telescope, together with apparatus for boresighting said telescopes, all of the narrow field of view telescopes having a common objective lens with means for separating the optical pathways.

Abstract: An adaptive imaging telescope having nonlinear sensing means for detecting an optical beam received thereby. The system comprises a phase shifter, positioned at the aperture of the telescope, responsive to the optical beam. This system also includes a nonlinear image quality sensor, optically coupled to the phase shifter, comprisinng a photodetector plate responsive to the optical beam for converting the optical beam into an electrical signal. Analog circuits are provided to receive the sensor output and provide a closed-loop return to the phase shifter.

Abstract: The disclosure pertains to a locking arrangement for a despin bearing assembly. The lock is produced by introducing liquid gallium into an annular gap having a V-shaped cross-section between shaft and housing of the assembly. The gallium is cooled to a temperature at which it becomes solid. Numerous depressions are milled into the inside sloping surface of the V-groove in the housing and as many holes are drilled through the mating annular protrusion on the shaft. These recesses become filled with gallium and provide many shear surfaces to accept loads between shaft and housing, thus avoiding yielding of metal at the ball-race interfaces in the bearings. Compression loads are also distributed over a broad surface of gallium throughout out the V-groove.

Abstract: An adaptive imaging telescope having nonlinear sensing means for detecting an optical image received thereby. The system comprises a phase shifter, positioned at the aperture of the telescope or at an image plane thereof. This system also includes a nonlinear image quality sensor optically coupled to the phase shifter, consisting of a quadrant nonlinear detector wherein each detector element of the quadrant detector is responsive to light from the optical image, the quadrant detector comprising nonlinear photocells or detectors whose plane is positioned at an image plane of the telescope. The photocells are connected to a network for providing image quality error signals. Analog circuits are provided to receive the sensor output and provide a closed-loop return to the phase shifter.

Abstract: An adaptive imaging telescope having a linear sensor for detecting a received optical image. The system includes a choice of two electro-optic phase shifters positioned substantially at the aperture of the telescope responsive to the received optical image. A non-coherent image quality sensor is provided consisting of a video camera and digital computation networks. This system also includes circuits responsive to outputs from the sensor feeding the phase shifter in a closed-loop arrangement.