Abstract: A ring laser gyro scale factor enhancement circuit connected between at least one power supply voltage level and a reference potential for conditioning at least a first and second input signal from a ring laser gyro assembly, the first and second input signals being essentially sinusoidal and having a common first input signal frequency, the second input signal having a predetermined first phase relationship with the first input signal for a first ring laser gyro rotational sense and a second predetermined phase relationship with the first input signal for a second ring laser gyro rotational sense.

Abstract: The FAULT TOLERANT GATE ARRAY USING DUPLICATION ONLY shown here renders AND-drives-OR, and OR-drives-AND, gate arrays as fault tolerant as when triplicated, but does so by only duplicating the array. A test input is added to each of gates of the bottom tier of the two arrays. When a test signal is applied, the same output should be produced by both arrays. This output should be the same as an expected test output, which is known in advance. When the test signal is withdrawn, the two arrays should continue to produce the same output as each other, although it may or may not be the same as the output under test. If any of these three conditions is not met, the failure may be used to determine the correct output, the failed array, and the nature of the failure.

Abstract: The MODEM WITH DIGITAL ISOLATION removes the relatively large heavy isolation transformer from the Data Access Arrangement and substitutes two tiny pulse transformers between the Integrated Analog and Digital Signal Processor with multiplexers and demultiplexers to eliminate analog distortion and multiple leads, and to accommodate Lap Top/Palm Top computers, while enhancing data speeds. The combination with surge protection enables both uncommon and common mode protection.

Abstract: A purely chemical method for forming a layer of insoluble sulfides on semiconductor surfaces in order to passivate their surfaces and more particularly to a method of forming a layer of insoluble sulfides on a HgCdTe device surface.

Abstract: A MOVING VEHICLE CLASSIFIER WITH ITERATIVE DECONVOLVER ESTIMATOR deconvolves a signal in which a plurality of sensed signals, which originate from a common signal source (namely, a moving vehicle) and traverse differing signal paths, are used to formulate an initial unconstrained estimation of the signal source as a reference signal. Preselected constraints are placed on the reference signal to generate an estimate of the source signal, and of a source signal matrix, for the plurality of input sensors. A pseudoinverse of the source matrix is then used to form an estimate of the impulse response of the propagation paths for the signals. The estimates of signal path impulse response are used in combination with the input signals to again estimate the unconstrained reference signal. This is in turn used to estimate a new source signal matrix and path responses. These estimation steps are repeated in a series of iterative steps until a point of minimum variance from the received signals is reached.

Abstract: To demonstrate a signal, the signal is sampled and each sample of the signal is multiplied by the sine and the cosine of a phase angle indicating when the sample was taken from the signal. The sinusoidal signal for producing an in-phase demodulated signal is Chebychev-approximation derived and computed as a selected even or odd polynomial, depending on whether the phase angle falls within one of a plurality of angular ranges. So that the error in the synthetic sinusoid is minimax and so that the even and odd polynomials have similar computational complexity, the angular ranges for the even polynomial exceed the angular ranges for the odd polynomial. Preferably, the sinusoid for producing a quadrature-phase demodulated signal is computed as a differential of the sinusoid spliced from the odd and even polynomials. Therefore the quadrature-phase demodulated signal can be provided with a minimal increase in computational complexity.

Abstract: An apparatus and method are disclosed for classifying a signal among a plurality of potential signal sources or events in which a signal embodying values for predefined source features is received and conditional likelihoods are determined for the correspondence of each feature value with each of the plurality of events. The individual conditional likelihood values for each feature which corresponds to a common event are multiplied together to form an overall conditional likelihood that any event in question is the source of the signal. The total likelihood products are then sorted into maximum and minimum values, with the maximum likelihood forming a tentative output designation. The ranked values are then examined by a decision logic element to determine if they satisfy certain minimum absolute and relative value threshold limits to verify if the maximum or next higher level likelihood values designate proper output choices.

Abstract: A ring laser gyroscope radiation-resistant detector lens system for mounting on a ring laser gyroscope body having a resonant cavity. The ring laser gyroscope body has CW and CCW counterpropagating light beams propagating in a plane normal to the rate input axis of the ring laser gyroscope. The ring laser gyroscope detector lens system comprises a means for extracting a component of each of the CW and a CCW light beams from the cavity and for combining the extracted CW and CCW beams to form a substantially circular interference light source. A planar array of detector element receives light from an objective lens means responsive to the interference light source. The objective lens means is a cylindrical lens that forms an elliptically-shaped interference light source pattern on a first and second adjacent pair of detectors in an array of four detector elements.

Abstract: A ring laser gyro, having: an envelope for an optically resonant cavity having a gain bore section, the envelope containing an active gas medium. The envelope contains electrically energizable electrode means having at least two electrodes at electrode locations within the envelope for establishing an electrical discharge in an active gas medium between the electrode locations. The electrical discharge excites a pair of light beams along a lasting path between the electrode locations. The light beams counterpropagate in the optically resonant cavity. The envelope is coupled to means for generating an output signal for the gyro by measuring a difference in the frequencies of the light beams. The active gas medium has an axial current driven gas flow and a return gas flow induced by the electrical discharge, the resultant gas flow contributing to bias errors in the output signal. The envelope also comprises a gas bypass cavity adapted to pneumatically couple the electrode locations along the gain bore.

Abstract: A COMBINED DECIMATION/INTERPOLATION FILTER FOR ADC AND DAC (analog-to-digital converter and digital-to-analog converter) provides a single filter which may be used both as a decimation filter and as an interpolation filter. It is simple and inexpensive. It gains simplicity and inexpensivenes by carefully selecting the tap weights of the filter, cascading multiple filters, time domain multiplexing the multiple filters into a single filter, and using adders instead of multipliers to provide the tap weights.

Abstract: A dynamically tunable notch filter is used within a continuously transmitting laser radar system for filtering narcissus signals generated from a continuous linear frequency modulated chirp transmission signal at the transmission aperture antenna with the filter including mixing and band pass filtering at the narcissus dynamic frequency to eliminate the unwanted narcissus signals varying over the dynamic frequency range of the narcissus signals, and to also eliminate unwanted target images, for improved resolution and detection of low level reflected target signals which are often obscured by the presence of the relatively high-level unwanted narcissus signals.

Abstract: The moving vehicle classifier with nonlinear mapper provides a method and apparatus for estimating the presence of a target moving vehicle in a sensor environment through estimation and classification of the sensor data. Values are extracted from the sensor data and a target function of extracted values is generated. Integrated function values representative of known vehicles in various physical states are prestored in a reference library. An integral function for the target function data is generated and mapped into a number of the prestored reference integral functions which provides a typically nonlinear mapping function. A MMSE curve fit is applied to this nonlinear mapping function to form a scaling factor for use in generating a scaled function of the data. The scaled data function is then compared to scaled reference functions in the library and the most similar, or least dissimilar, reference is chosen as an estimation of what known vehicle the sensor data represents.

Abstract: A ring laser gyro, having: an envelope for an optically resonant cavity having a gain bore section, the envelope containing an active gas medium. The envelope contains electrically gain bore energizable electrode means having at least two electrodes at electrode locations within the envelope for establishing an electrical discharge in an active gas medium between the electrode locations. The electrical discharge excites a pair of light beams along a lasing path between the electrode locations. The light beams counter-propagate in the optically resonant cavity. The envelope is coupled to means for generating an output signal for the gyro by measuring a difference in the frequencies of the light beams. The active gas medium has an axial current driven gas flow and a return gas flow induced by the electrical discharge in the gain bore. The resultant gas flow contributes to bias errors in the output signal.

Abstract: The Infrared absorptive coating for beryllium surface shown here is produced by providing a flat beryllium surface 10, which is cleaned 12, toughened 14, coated with a modifying material 16-22, and anodized 24. The modifying material, preferably aluminum, is selected for infrared absorptiveness. It is applied in a thickness, preferably about 0.0001 inch sufficient to provide such absorptiveness without excessively interfering with the nuclear hardness of the underlying beryllium.

Abstract: A plurality of heat sinks assembled to form a rack in a lightweight box accommodate printed circuit cards between the heat sinks and circulate cooling oil through the heat sinks to drain the test heat from the boards quickly. Each heat sink includes a porous metal foam core configured in zigzag shape to provide a tortuous path for the fluid flow which extends into lateral fins comprising the side plates of the metal foam for receiving the cards or ground plates therefore. These plates are clamped against the fins for close contact to the cooling fluid thereby shortening the heat flow path. Brazed on aluminum top and bottom cover plates make a fluid tight connection with the porous metal. The brazed on top and bottom plates are also configured in the zigzag pattern of the foam.

Abstract: A laser radar for scanning a target aperture having a predetermined array of locations comprising a laser means having a power source and a resonator cavity containing a lasing medium, the laser means providing a SINGLE FREQUENCY LIGHT SOURCE (FO); means for dividing the SINGLE FREQUENCY LIGHT SOURCE into FIRST and SECOND REFERENCE FREQUENCY BEAMS; frequency shifting means for frequency shifting the FIRST REFERENCE FREQUENCY BEAM to form a FREQUENCY SHIFTED BEAM; control means for providing APERTURE DIRECTION SIGNALS; scanner means responsive to the APERTURE DIRECTION SIGNALS for combining and directing the FIRST REFERENCE FREQUENCY BEAM and the FREQUENCY SHIFTED BEAM to each predetermined target aperture location and for receiving a combined REFLECTED REFERENCE FREQUENCY BEAM SIGNAL and a REFLECTED FREQUENCY SHIFTED BEAM SIGNAL from the target; detector means for combining and detecting a sample of the SECOND REFERENCE FREQUENCY BEAMS in combination with the REFLECTED REFERENCE FREQUENCY BEAM SIGNAL and the

Abstract: A computing element for use in an array in a neural network. Each computing element has K (K>1) input signal terminals, K input backpropagated signal terminals, K output backpropagated signal terminals and at least one output terminal. The input terminals of the computing element located in row i, column j of the array of computing elements receive a sequence of concurrent input signals on K parallel input lines representing a parallel input signal S.sub.ij having vector elements (s.sub.ij1, s.sub.ij2, s.sub.ij3, . . . , s.sub.ijk).sup.T. The K input backpropagated signal terminals are coupled to receive an m-dimensional (m<K) backpropagated signal vector characterized to provide a measure of the performance error of the computing element. The computing element comprises a weighting function means responsive to the concurrent input signal S.sub.ij for computing a K-dimensional weighting coefficient and a scalar activation signal u.sub.ij by computing a K-dimensional weighting-coefficient vector, W.sub.

Abstract: The Ceramic frames and capsules for Z-axis modules shown herein are formed by placing chips 10 into a ceramic frame 12, breaking apart the frame 12 into sub-frames 26, and bonding the sub-frames 26 into a module 30. The sub-frames 26 may be separated by ceramic sub-backings 28. Each sub-frame 26 and sub-backing 28 forms a capsule 22.

Abstract: The ACTIVE SURGE REJECTION CIRCUIT uses a FET connected in one of the TIP and RING leads to open and close the lead. A JK flip-flop is connected to a voltage sensing circuit which senses voltage surges and clocks the flip-flop early in the voltage rise. This activates a first circuit to ground the FET gate and hold the FET open. Meanwhile, a second circuit comprising an RC circuit charges a capacitor which maintains the FET in its OFF condition for a period of time longer than the surge, i.e., about 1 m sec, and then clears the JK flip-flop after the capacitor has discharged a predetermined amount. This invention thus provides surge (noncommon mode) protection, and is especially useful in protecting modems from voltage surges while minimizing signal distortion during non-surge conditions.

Abstract: Method and apparatus for vapor phase free methyl radical transport of indium dopant species for precise predetermined reproducible doping concentrations to control electrical properties for MOCVD grown materials.