Abstract: A bi-phase signal detection apparatus having a milti-tapped delay line to delay a coded input signal. A polarity change in the input signal loads the signal on each delay tap into a parallel shift register. A subsequent delayed polarity change will apply the shift register signals into the decode logic circuit which determines the output signals.

Abstract: A digital pulse detection apparatus for correcting a distorted serial digital signal by differencing the signal and a delayed version of the signal in a differential amplifier to obtain the slope of the digital signal. The output signal from the differential amplifier is applied to a voltage hysteresis differential amplifier which provides the corrected digital output signal.

Abstract: A method for soldering and contouring foil E-beam windows for an excimer laser using a two step procedure during soldering to prevent stressing the foil material. The foil material is plated with nickel and soldering material in narrow strips that are spaced slightly greater than the spacing between the coolant ribs. The excess foil material between the ribs forms the desired foil curvature between ribs. The foil is pressed into place on the pre-heated coolant ribs using a template that has a bottom surface shaped exactly as the desired foil contour. The foil is held in place until the solder melts and then solidifies. When the template is removed, a contoured foil window which has not been stressed or strained, remains.

Abstract: An ADCCP communication processor apparatus operates on-line between the PARCS data transmission controller (DTC) and the NORAD Cheyenne Mountain complex. The ADCCP communication processor apparatus accepts AUTODIN Mode 1, 80 character block by block serial transmission from PARCS DTC (channels 2 and 3), reformats the messages into an ADCCP frame structure, and multiplexes and interleaves the transmission to the NCMC computer on a prime data link.

Abstract: An incident light field is applied to the two separate front fiber faces of a pair of identical optical fibers which are initially held in a common plane. One fiber face is always kept stationary. The other fiber face may be moved either laterally in a plane common to the stationary face, or longitudinally into and out of the common plane. The output end of the device comprises two separate rear fiber faces that are held in a common plane. These faces are stationary. There is no lateral or longitudinal motion of one relative to the other. The light emerging from these two faces interferes in the far field. Straight line interference fringes whose spacing depends upon the lateral separation of the rear fiber faces are formed. The fringe modulation, however, depends upon the relative position of the front fiber faces. This modulation changes as one front face is scanned either laterally or longitudinally.

Abstract: A variable analog delay line apparatus utilizing a plurality of tapped SAW devices that are connected in series by single pole multi-throw switch units. The amount of delay is determined by the switch throw arm of the switch unit that is associated with the SAW device. The delay times are added serially to obtain the needed delay.

Abstract: A transient detector apparatus utilizing peak and slope detectors to determine the presence of transient signal in a logic signal. Individual slope measurements of the input signal are compared with a logic criteria to establish the occurrence of a transient. The peak voltage and pulse width of a transient are digitized in order to time tag or isolate a transient to a particular signal.

Abstract: An electric resistance heater array having an open metal frame with multiple heater wires of heavy gauge, U-shaped Nichrome wire that are vertically spaced across the panel. The lower vertical portions of the heater wire are encased in ceramic sleeves which insulate the wire from the small apertures in the metal frame that support the wire by its constraints upon side to side and fore to aft movement.

Abstract: A thermally controlled T/R module test apparatus utilizing a multi-stage thermoelectric cooling module to maintain a T/R module at predetemined temperature during test measurements. The thermoelectric cooling module provides a cooling capacity of 9 watts and a temperature differential of 80.degree. centigrade which allows the T/R module to be thermally cycled during the test measurements.

Abstract: A low noise two port voltage controlled oscillator having a coarse tuning circuit serially connected to an inductor to form a resonant circuit. A fine tuning circuit is serially connected between the resonant circuit and the input to the amplifier. A large capacitance series silicon varactor minimizes noise at the frequency of operation while optimizing the coarse tuning range.

Abstract: A field effect transistor (FET) quadrature switch for the control of multi mode microwave phase shifters provides bi-directional random mode switching while using only one power supply. The switch apparatus provides high speed, high voltage, and high-current switching while reducing the stand off voltage requirement of the linear driver, the number of switching elements which are required for mechanization, and reducing the size, weight and the complexity of the apparatus.

Abstract: The survivable ground base sensor is the basic element of a land-based distributed radar that consists of 60 or more individual subarrays, which are located in either a straight line or on the perimeter of a 200 nmi diameter circle in the north central U.S. At least 10 nmi separation is provided between individual subarrays. Each subarray is self-contained with emergency power and is operated unattended. There is no need for any interconnection between subarrays so that the survivability is improved, and there is no limit to the number of subarrays used except that imposed by cost and the desire for greater survivability. Since the spacing between subarrays is 10 nmi, a direct hit on one subarray will not damage an adjacent one so that a separate re-entry vehicles must be targeted to each subarray.

Abstract: A charge depletion meter apparatus having a current to frequency converter to sense and convert the current drain of a battery source to a digital signal which is divided and then accumulated in a counter. An LCD display unit displays the accumulated charge which is received from the counter.

Abstract: An autonomous uninterruptable power supply apparatus utilizing a digital processor unit as a control and monitor unit to measure and control input and output parameters in the power supply. A battery charger is utilized to maintain the voltage and current levels with the backup battery supply source which powers an inverter unit that converts the DC power to an AC output.

Abstract: A wavefront sensor apparatus for a large optical system, such as a telescope, having a reticle with at least one slit therein to provide image signatures for various portions of the aperture to an array of infrared sensor cells. The time differences between the image signatures represents relative image displacement caused by the wavefront slope variation in the actual wavefront.

Abstract: A MOSFET isolation amplifier apparatus to allow stable high frequency linear operation of MOSFET power stages and to provide precise regulation of a load current through a magnetic yoke load. Variations of transfer characteristics and input parameters in the MOSFET power stages are corrected by use of a feedback signal which is generated in a current sense resistor by the load current. Such a power stage allows the implementation of isolation amplifiers which can provide high power high frequency linear regulation at elevated voltages and currents.

Abstract: A plurality of telescopes provide output return signals which are applied both directly and in sampled form to a photo-detector cell. The detected signals from the photo-detector will represent the constant and transient errors of the telescope system. A low pass filter insures that the tracker provides only the constant or D.C. component of the error, while a high pass filter insures that the existing measuring devices for each telescope beam provide only the transient or A.C. component of the error. The A.C. and D.C. error signals are summed together with the appropriate applied gains on each channel such that the sum reconstructs the original telescope position error with good fidelity.

Abstract: A direct cable attachment method for directly connecting a flat ribbon cable to a stack of integrated circuit units by pre-tinning the leads of both the ribbon cable and the wiring board with solder. Positioning the ribbon cable on the wiring board and applying sufficient heat to the combination to achieve a physical and electrical connection. Adding epoxy to the assembly structure provides additional strength.

Abstract: An automatic authentication apparatus utilizing a random code generator to provide a challenge signal for transmission to a remote station. The challenge code also being converted to a response code at the sending station and stored therein. The receiving station generating a response signal to the challenge signal and transmitting the response signal to the sending station. The sending station comparing the two response signals to determine that communications with a friendly station has been established.

Abstract: The formation of thin-film resistors by the ion implantation of a metallic conductive layer in the surface of a layer of phosphosilicate glass or borophosphosilicate glass which is deposited on a silicon substrate. The metallic conductive layer materials comprise one of the group consisting of tantalum, ruthenium, rhodium, platinum and chromium silicide. The resistor is formed and annealed prior to deposition of metal, e.g. aluminum, on the substrate.