Abstract: A resonator mounting assembly wherein the resonator blank is mounted agai an essentially planar surface presented by a plurality of peripherally disposed mounting clips and bonded to this surface to provide substantially all the mechanical support for the blank in a direction normal to the major faces of the resonator blank, while being flexible in the directions parallel to said major faces so as to minimize radial stresses on the resonator blank, particularly during thermal cycling of the resonator assembly. The clips are fabricated of a low thermal expansion material, such as molybdenum, which also has considerable yield strength after exposure to processing temperatures; the bonding of the clips to the edges of the resonator blank can be achieved by a polyimide containing electrically conductive particles.

Abstract: A scene containing one or more targets for simulated target practice is pographed in a special motion picture camera such that only one half of each frame is exposed. After reversal development, a transparent template having two sets of aligned, spaced-apart cross-hairs is positioned over the film such that the upper set of cross-hairs is aligned with one of the recorded targets. Then, using the lower pair of cross-hairs as a guide, a pin-hole is punched in the unexposed i.e. opaque portion of the frame. This action is repeated for every frame in the film, altering the size of the dot as need be, as the target moves towards or away from the camera.

Abstract: The laser beam to be measured is focussed onto a photographic film to rec the beam pattern. A second laser beam is then used to measure the displacement of the side lobes from the main beam. An apertured metal plate is then substituted for the film and, by the use of a beam deflector and a calorimeter, the intensity of the main beam alone is measured. Using the beam displacement data previously recorded, the metal plate is then moved to co-incide with one of the side lobes and the intensity of the side lobe recorded. This procedure is repeated for all remaining side lobes.

Abstract: Disclosed is a pair of channel waveguide CO.sub.2 lasers formed in a common eramic block. Both discharge channels are DC excited for CW operation and share common mirrors at both ends. The laser cavity includes a Stark cell coupled via a window to one end of both discharge cannels and contains ammonia or deuterated ammonia. The Stark cell is further truncated by a grating opposite the window to provide an overall three mirror cavity configuration which permits predetermined laser line selection. The Stark cell, moreover, is configured to include two pairs of electrodes which permit independent voltage modulation of the two CO.sub.2 laser beams.

Abstract: An antenna array radiation pattern switching system suitable for use in re-gated, pulse doppler, radar systems. The antenna array includes first and second antennas, one of which is fed through a fixed phase-shift network while the other is fed through a phase-shift network with double the phase shift of the fixed phase-shift network that can selectively be switched in and out of the feed circuit.

Abstract: A range-gated radar system which includes a phase modulator that modulates n r.f. generator with a signal which may be binary coded. In a preferred embodiment, the binary signal is a periodic signal of 2.sup.N -1 bits per period. Starting at some arbitrary point in the sequence, K contiguous bits are transmitted then M contiguous bits are passed over, then K more bits are transmitted, and so on. The quantities M+K and 2.sup.N -1 have no primary factors in common. The radar system may be a doppler radar system using balanced digital processing which involves separating the upper and lower sideband components of modulation that exist in the return radar signal as a result of the motion of scatterers and subtracting them.

Abstract: A dual frequency moving target radar system having a lower frequency chan which provides relatively good moving target detection in the presence of such obstacles as foliage and precipitation and a higher frequency channel which provides accurate location of targets wherein the Doppler signals from the two channels are correlated to provide suitable target identification which target and clutter are present in the same resolution cell. The Doppler frequency is processed to distinguish the moving target from other returns. Electroacoustic transducers can be used in either of said channels to aid in target identification.

Abstract: A time division multiple access mobile communications system employing a f-adaptive feature and perfect noise codes to enable utilization of the system. The self-adaptive feature permits switching to vacant channels as interfering users move to an occupied channel. The noise codes employed are of the type termed code mates having correlation functions which upon detection provide an impulse autocorrelation function. The described arrangement enables random access to be accomplished with minimal interference between users. Large improvements in signal-to-noise power ratio and in signal-to-jamming power ratio will be seen to result.

Abstract: A recording system for use with a laser weapon simulator in which a laser am is transmitted through a window, bearing a target visible to the marksman, and onto a film record. A filter in the window blocks passage of the ambient light but passes the light from the laser beam and the back face of the window is provided with an illuminated, generally superimposed replica of the target. The replica of the target is photographed at the instant of firing by means of a camera, the shutter of which is electronically coupled to the weapon simulator, thereby permanently recording the position of the laser hit.

Abstract: A pocket size dose rate monitor is disclosed which is meterless, small and ugged. The instrument is cylindrically shaped so as to be carried, for example, in the shirt pocket of a user. A battery powered blocking oscillator drives a Geiger-Mueller ionization chamber which is series connected to a potentiometer whose movable slider contact is associated with an indicator scale which is calibrated, for example, in dose rate. The slider contact is also electrically coupled to a circuit which is adapted to control the energization of a miniature electric lamp or other type of light source such as a light emitting diode. For a measuring or monitoring dose rate, the user manipulates an actuator element which varies a control voltage selected from the voltage appearing across a calibrated potentiometer for controlling the operation of the control circuit.

Abstract: A digital data communications system including control techniques and cirtry for providing ternary detection; that is, mark, space, mark or space indeterminate states. The indeterminate state is useful in preventing synchronism loss during momentary propagation disturbances and to provide tighter system control.

Abstract: A pulse generation system using an inductive energy storage technique is described. A high magnitude current flowing in a storage inductor is suddenly halted by means of a repetitive series interrupter device and an accompanying magnetic field coupled control circuit. The resulting high voltage generated causes breakdown across a spark gap and transmission of a high energy pulse to a load.

Abstract: An improved cylindrical Geiger-Mueller tube with a life at least ten times reater than that heretofore obtainable includes a re-entrant insulator at each end of the tube to support the coaxial anode and to shield the tube ends from the Geiger discharge.

Abstract: Acoustic ultrasonic waves are launched in a block of single-crystal mater, such as alpha-quartz, by means of a transducer fastened to one end of the block. The waves are steered by electrically altering the properties of the crystal between the piezoelectrically unstiffened and stiffened excitation modes.

Abstract: An electro-optical apparatus for marksmanship training wherein a simulated cene is presented on a screen by a motion picture projector. The marksman or trainee operates a weapon, which includes a module to develop a laser beam, to simulate firing at a target on the scene. The apparatus provides an improved optical system including a dichroic mirror which permits the light which projects the target scene to pass through the mirror for providing an improved scene illumination while reflecting substantially all the laser beam energy to activate a target hit detector.

Abstract: A system for facilitating the training of a trainee to operate a target refinder. The system includes a slide (or film) projector for projecting a battlefield scene including one or more targets onto a viewing screen. The slide includes data annotated thereon corresponding to the range of the target; the target range is communicated to an operating console. A rangefinder simulator includes a means for generating a laser beam. In operation, the trainee sights the target, sets the range gate and fires the laser beam. When the laser beam hits the target, the console displays the proper range data which is then compared to the range set on the simulator by the trainee.

Abstract: A device is disclosed for amplifying electromagnetic waves propagating al a meander line slow wave structure by means of magnetic cylindrical domains or bubbles which are propagating at substantially the same velocity as the RF wave in an adjacent platelet of orthoferrite having associated with it a propagation arrangement of the conventional type which is adapted to move the domains from one end of the platelet to the other. Since the magnetic bubbles are magnetic dipoles that produce magnetic surface charges, a portion of their energy is transferred to the propagating RF wave, resulting in amplification of the RF wave.

Abstract: A film projector system including a sealed film cassette removeably mounted ithin an aperture in the projector and driving means in said projector mechanically engaging coupling means extending through said cassette for driving the sealed film between hubs sealed in said cassette intermittently past a film projection location in said cassette and continuously past a sound detection location therein, with the projection plane of the film at said projector locations being disposed normal to the projector optical projection optical sound beams and twisted ninety degrees with respect to the plane of that portion of the film wound on said hubs so that the projector beams do not pass between the film hubs.

Abstract: A unitary broadband high impedance isolation section for a plurality of cely spaced antennas as well as other electrical apparatus wherein the respective separate coaxial cables feeding the antennas and the shielded multi conductor cable for the other electrical apparatus are wound in the same direction on a common core and have the same number of turns, with the shields or outer conductors of all the cables being respectively connected together at the beginning and the end of the windings. The multiport cable choke thus configured can be provided with respective connectors at each end of the choke for facilitating ease of installation into the electrical system, that is, a single multiport cable choke can be inserted in the feed lines of multiple antennas and other electrical equipment simply by means of making suitable interconnections by way of the connectors on both sides of the multiport cable choke assembly.

Abstract: A method and system are provided to determine the relative orientation of o physical systems (i.e., assemblages of equipment which share a common, locally defined coordinate system). Two distinct beam vectors (i.e. fixed directions in three dimensional space) are simultaneously resolved by each physical system into their apparent vector components. This set of four apparent vectors is sufficient to uniquely and accurately define the transformation matrix relating the local coordinate system of the two physical systems and thus their relative orientation.Applications of the disclosed method and system relate to situations where observations made in one physical system are to be correlated with or acted upon by the other physical system.