Abstract: An improved cryogenic refrigerator having a drive mechanism suitable for use with gap or clearance seals is disclosed. The drive mechanism includes two reciprocating members, e.g. piston and regenerator/displacer, driven by a common rotating drive shaft. The regenerator/displacer portion of the drive shaft includes a roller at one end in engagement with a rod base plate for driving a rod connected to the regenerator/displacer and a spring for returning the regenerator/displacer simultaneously with the withdrawal of the drive shaft. The piston portion of the drive shaft is connected to a first end of a hollow body. The second end of the hollow body which is opposite the first end has the piston rigidly affixed thereto. The hollow body has a portion adjacent the first end supported by a guide whereby the piston is substantially isolated from side force loads during reciprocation.

Abstract: A cannon launched guided projectile having a gyro based electro-optical target finding and guidance system which includes an optical system carried by a gyro to provide target location information for an electronic system to produce gyro rotor torquing signals and for producing projectile guidance signals from gyro pickoff outputs is disclosed. The electronics system includes two difference channels for processing pitch and yaw signals responsive to the electrical output of a light detector and a sum channel for controlling the two difference channels responsive to target acquisition and master trigger signals.

Abstract: The present invention teaches infrared chalcogenide glass compositions having very low dispersion in the eight to twelve micron range, which are formed as III-V-VI-VII compositions, e.g. 14% (atomic) gallium plus 25% antimony plus 40% selenium plus 21% bromine. The introduction of a group VII component into a chalcogenide glass provides low dispersion, and the group III component compensates for the strong devitrification tendencies of the group VII component and maintains the mechanical properties of the glass.

Abstract: A global position system (GPS) capable of multiple (two or more space vehicles) space vehicle (SV) multiplexing comprises an RF energy receiver for receiving high and low frequencies (L.sub.1 and L.sub.2) from a plurality of SVs on different codes, a switching means for alternately switching the RF receiver between the coded L.sub.1, L.sub.2 signals for detection, a digital processing means, replica coded L.sub.1, L.sub.2 signal producing hardware, and a coherent time and frequency synthesis means, said digital processing means connected to the RF receiver, coherent time and frequency synthesis means, and replica coded L.sub.1, L.sub.2 signal producing hardware for producing for the RF receiver replica coded L.sub.1, L.sub.

Abstract: A reflective afocal beam expander optical system is disclosed for transmitting electromagnetic (EM) energy. The beam expander, in the preferred embodiment, is comprised of a reflective afocal system including a section of a primary parabolic mirror, a section of a secondary parabolic mirror, and a beam splitter. The two mirrors have a common axis of rotational symmetry and a common focus point and the centerline of the incoming EM energy is displaced from the axis of rotational symmetry. The beam splitter is positioned with respect to the primary mirror to receive the edge rays of the EM energy and cause the EM energy to be folded and exit through a window while clearing all optical elements. A viewing system having a viewing axis through the beamsplitter allows a viewer to see through the same window as the exiting EM energy. A second refractive afocal optical system is made integral to the specific laser system being used in order to control beam expansion ratios.

Abstract: Alternating current is applied to a bi-directional triode thyristor (triac) and a zero voltage switch, the zero voltage switch controls the operation of the triac to selectively heat a heater element, the thermal energy of the heater element drives a first thermoelectric heat pump (module), acting as a dc power generator, to produce power to drive a second thermoelectric heat pump acting as a cooling or heating source, towards a preselected temperature, a thermally sensitive resistor (thermistor) senses the temperature and generates a resistance corresponding to the temperature, the thermistor is connected to the zero voltage switch in series with a temperature set point resistor (potentiometer) and source of power to form a voltage divider input to the zero voltage switch, whereby when the resistance of the thermistor substantially equals that of the temperature set point resistor the zero voltage switch inhibits the trigger pulses to the triac to cut off ac current to the heater element.

Abstract: A global positioning system comprises an RF receiver for receiving L.sub.1, L.sub.2 p-code or ca code modulated frequency outputs from one or more space vehicles, a multiplexer operably connected to the receiver multiplexes the L.sub.1 and L.sub.2 signals to the receiver, and code and carrier tracking loops operably connected to the receiver, each loop including a plurality of filters, one for tracking line-of-sight dynamics and another for determining ionosphere effects on the L.sub.1 and/or L.sub.2 signals.

Abstract: Disclosed is a pulsed FM receiver with automatic centering of the intermediate frequency at the true center of the input filter passband. The frequency standard of the frequency discriminator which controls the local oscillator frequency is adjusted to produce zero discriminator output during the period between signal pulses. The discriminator frequency standard remains automatically aligned with the center of the input filter passband and the input bandwidth may then be reduced for optimum receiver sensitivity.

Abstract: A broad band surface acoustic wave (SAW) device has an edge-deposited transducer (EDT) capable of frequencies in excess of 1 GHz and bandwidths in the hundreds of MHz. The device includes a transducer on a semiconductor substrate which is either non-piezoelectric or weakly piezoelectric. The substrate has a sharp, smooth edge formed by the intersection of its top and a side surface. The transducer includes a passivation layer deposited on the side surface of the substrate and a starter layer deposited on the passivation layer; an inner metallic (gold, for example) electrode deposited on the starter layer; a transducer layer deposited on the inner metallic electrode; and an outer metallic electrode deposited on the transducer layer. The outer electrode is formed on the transducer layer one-fifth wavelength below the top surface of the substrate.

Abstract: An integrated circuit (IC) device package is disclosed suitable for accommodating large terminal count IC devices in a very small space. A first set of terminals is located in notches around the periphery of the package. A second set of terminals is located inboard of the package and are comprised of metallized annular rings on the top and bottom surfaces of the package around holes or apertures through the surfaces of the package with metallization coating the holes to connect the top and bottom annular rings. This second set of terminals may be arranged in rows parallel to the edges of the package and may be connected to the IC device through buried conductor traces and wire bonding techniques. If necessary, additional rows of metallized holes can be utilized in a grid configuration, preferably at 0.050" centers.

Abstract: A communications link having a position capability responsive to either a manual or remote control actuation. In one embodiment, a remote carrier has a navigation system for outputting signals representative of the carrier location or position. A frequency shift key (FSK) modulator is connected to the navigation system for tone coding the carrier position signals, a transmitter of a transceiver is connected to the modulator for transmitting the carrier position signals, and a position enable switch for controlling selectively the transmittal of the carrier position signals.

Abstract: An infrared random access imager system is disclosed which includes a scanning mechanism, a random access imager detector matrix, and a video signal processor. The scanning mechanism scans the infrared energy emanating from a scene in the field-of-view. The random access imager detector matrix stores charges as charge packets representative of the infrared energy impinging thereon and the video signal processor processes the charge packets into video signals. Each random access imager detector matrix element comprises a modified charge injection device, which has two electrodes per unit cell, and horizontal and vertical metal-lead address lines, to which is added a third electrode. The third electrode is a transfer gate which transfers the charge of the detector element into a read line and keeps the charge from one detector from spilling into the detector well of an adjoining unit cell. Thus, charge carriers are created by photoabsorption and collected in the detector well (storage well).

Abstract: A navigational aid and autopilot in which informational data pertaining to the physical operating conditions of the craft, the external characteristics relevant to the operation of the craft, and a chart mapping a selected portion of the surface of the earth in which the craft is operating are combined into a single communication correlating such data in a manner assisting an operator of the craft in the performance of his duties. The navigational aid measures external physical conditions such as radio transmissions, radar soundings, sonar soundings, and the like, as well as the physical state of the craft such as fuel flow, list of the craft, and speed of the motor. By monitoring these characteristics in association with an electronic chart, the system correlates and combines the total informational content in a comprehensive form so as to relieve the operator pilot of the necessity of integrating and correlating data from a plurality of different sources.

Abstract: An electronic chart system in which charts of the earth are stored in digital representation and communicated to the operator by a visual display. Through the use of a Loran-C receiver or the like, the system additionally plots the carrier's position on the visual representation of the chart. The visual display is a cathode ray tube on which the visual representation is compressed or expanded to meet the demands of the operator so that the appropriate resolution is thereby obtained. To minimize memory size an encoding format is used which provides a data word for indicating the first physical element of the run line, a data word for the number of runs per line and data words for the lengths of N-1 runs of up to two variables for each line of the chart.

Abstract: A system for detecting, tracking and guiding a missile to a target is disclosed. The missile has a beacon which emits infrared signals. A night sight, which has a reticled infrared receiver for sighting a target, detects the infrared signals of the missile relative to the center of the reticle and converts the infrared signals to electrical signals representative of the impinging infrared energy. The IR receiver output is connected to a computerized beacon tracking unit. The tracking unit determines when beacon signals are detected by the receiver, tracks and guides the missile to its destination by computing missile position pitch and yaw guidance signals to align the missile with the target.

Abstract: A heterodyne laser ranging system is disclosed which provides a waveguide housing which includes a first and second gas laser. The first laser is a low pressure laser while the second laser is a high pressure laser. These two lasers formed in the waveguide housing have their longitudinal axis in optical alignment. In the preferred embodiment, the second high pressure gas laser is a transversely excited atmospheric (TEA) laser. The first low pressure gas laser produces two outputs, one of the outputs is a low level local oscillator signal while the second output is transmitted as an input to the high pressure laser. The second high pressure laser builds up from the injected signal from the low pressure laser which results in a high pressure laser pulse output that has the frequency stability of the low pressure laser while maintaining the high peak power output available from a transversely pumped waveguide laser.

Abstract: An improved ferroelectric imaging system comprises a chopper, lens system, ferroelectric detector matrix, switching matrix, temperature controlled heat sink, drive and read out electronics, video processor and display. The chopper interrupts infrared energy emanating from a scene, and the lens system focuses the chopped infrared energy on the ferroelectric detector matrix which produces electrical signals representative of the infrared energy impinging thereon. The signals are read out by the drive and read out electronics whose action is synchronized with the chopper action, processed in the video processor and displayed by the display. The ferroelectric detector matrix comprises a plurality of detector capacitor elements whose top plates are formed by conductor stripes longitudinally disposed on a dielectric of ferroelectric material and whose lower plates are a plurality of metal pads formed on the dielectric.

Abstract: An infrared charge transfer device (CTD) imaging system is disclosed which includes an optic system for focusing infrared energy emanating from a scene, a detector matrix for receiving the focused infrared energy and converting it to electrical signals representative of the intensity of the infrared energy, and a video processor for processing the electrical signals into video signals. The detector matrix of the system is a plurality of IR detector cells arranged in rows and columns. Each detector cell includes a substrate of semiconductor material, an integrating electrode, a drain electrode, a transfer electrode and insulating layers. The integrating electrode is centrally disposed with respect to the drain and transfer electrodes with the integrating electrode in a spaced relationship with the drain electrode. The integrating and drain electrodes form first level MIS electrodes on the semiconductor substrate.

Abstract: An improved marine radio telephone is disclosed having a microphone, display, speaker, and controls. The controls include switches and a keyboard located together with a display in a panel, a microphone conveniently located as to the front panel, and a push-to-talk switch incorporated in the microphone. A panel printed wiring board is provided for the control circuits. Digital logic circuits, including a special purpose microcomputer and a power supply mounted on a second printed wiring board, interface with the control circuits and display. The control circuits include circuit blocking means which can be readily removed to permit, when authorized, transmission on Coast Guard auxiliary channels 21, 23, 81, 82, and 83. A frequency synthesizer interfaces between the logic circuits and a transmitter and receiver. The synthesizer and receiver are mounted on a third PWB, and the transmitter is mounted on a fourth printed wiring board.

Abstract: An infrared detector assembly comprising a substrate of suitable material such as sapphire, an infrared detector array attached to the substrate, a cold shield attached to the detector array, and an optical microphonics filter attached to the cold shield is disclosed. The optical microphonics filter includes a substrate of material having its major surfaces coated with layers of thin film coatings for passing a preselected frequency band, and a metalization for reflecting spurious energy impinging thereon thereby shielding the filter's substrate and coatings therefrom.