Abstract: In a multi-user detection system in which interfering signals are purposely allowed to exist, a parameter estimation unit is provided which utilizes signal processing for determining the channel transfer function for each received signal, including the received power, phase of the oscillator, timing offset relative to the base station clock carrier frequency offset, and number of multipaths replicas and delays for each replica, with the system providing realtime uninterrupted estimates of these parameters required by the signal separation unit.

Abstract: A method for designing a cell-based ASIC device with multiple power supply voltages is disclosed. An ASIC chip image is made without applying power or ground buses to metal layer M1. All fast or high-power circuits are grouped together into high-power logic blocks and synthesized with high-power circuit macro libraries. All slow or low-power circuits are grouped together into low-power logic blocks and synthesized with low power circuit macro libraries. The associate power and ground buses are applied to metal layer M1 in each of the logic blocks. The logic blocks are placed on the ASIC so that different voltage groups are separated by at least one cell. The ASIC is then routed and tested before the mask is released.

Abstract: A circuit for accessing a chalcogenide memory array is disclosed. The chalcogenide memory array includes multiple subarrays with rows and columns formed by chalcogenide storage elements. The chalcogenide memory array is accessed by discrete read and write circuits. Associated with a respective one of the subarrays, each of the write circuits includes an independent write 0 circuit and an independent write 1 circuit. Also associated with a respective one of the subarrays, each of the read circuits includes a sense amplifier circuit. In addition, a voltage level control module is coupled to the read and write circuits to ensure that voltages across the chalcogenide storage elements within the chalcogenide memory array do not exceed a predetermined value during read and write operations.

Abstract: One aspect of the invention relates to a laser ranging system. In this version of the invention, a guided missile is provided with laser that directs laser radiation in the general direction of a target that is subsequently reflected from the target back to the missile. A receiving lens is mounted on the missile that receives the reflected laser radiation. A ferrule containing optical fibers divided into a plurality of pixels that receive the reflected laser radiation from the receiving lens, wherein each pixel in the plurality of pixels is provided a different pointing angle by arranging the fibers within the pixel such that the centroid of the field of view of the fibers is different from the centroids of the field of views of the other fibers in the other pixels.

Abstract: An electrical connection between a power source and a threaded aperture in a power device is made by means of a terminal lug and a bolt. In order to measure the current, a second electrical path is made in parallel with the bolted connection, and current in the second path is sensed. The bolt may carry the main current, or an insulating spacer may be used which prevents significant current flow in the bolt. In one embodiment, the parallel current path extends through a conductor arrangement including additional lugs through which the bolt passes, and in another arrangement the parallel path extends through traces of a printed circuit board.

Abstract: A re-circulating amplifier comprising a SAW filter with group delay characteristics for providing a time delay function.

Abstract: A plastic mouldable explosive composition comprises a gelled binder and a particulate explosive filler contained in the binder, wherein the binder comprises a blend of polyethylene wax polymer together with a tackifying resin comprising a polyisobutene polymer. Desirably, the amount of the polyethylene wax polymer in the composition is in the range 2 to 35 percent by weight, the polyethylene polymer having a molecular weight in the inclusive range 3,000 to 15,000. Desirably, the polyisobutene polymer comprises a liquid polyisobutene having a molecular weight of from 500 to 7,000.

Abstract: A wave-form generator drives a number of microwave generating devices each operating at different frequency bands. The output of each microwave generator is connected to its own transmission channel of limited bandwidth which contains all the non-linear components necessary for transmission such as an amplifier, T/R switch, rotary joint and beam switch. These individual channels are finally combined onto a common wideband channel which contains only substantially linear components such as a single waveguide and the antenna itself. Because of the isolation between channels there is little or no opportunity for the generation of harmonics or intermodulation distortions which would otherwise occur in a transmitter capable of operating over a very wide bandwidth.

Abstract: A system is provided for rapidly ascertaining the position of a pulse train emitter such as a radar using multiple collectors without requiring more than one platform to measure the same pulse. Thus time-of-arrival measurements at a number of collecting platforms are performed, with the positions of the platforms being accurately ascertainable using GPS data, and with time synchronization between the spaced-apart collectors performed by utilizing atomic clocks. In the multi-ship case, geolocation can be performed on ten milliseconds of data as opposed to 30 seconds of data for measurements involving a single platform. The subject system is preferable to conventional time-difference-of-arrival geolocation systems because those systems require that each of the collecting platforms measure the same pulse from the emitter, which severely constrains the flight paths of the collectors, limits the amount of usable data, and increases the system's sensitivity requirements.

Abstract: A method of fabricating a dense pixel array comprising the steps of: (a) printing a photoresist mask and applying said mask to a semiconductor material substrate to form a masked area and an unmasked area on said substrate; (b) applying a photoresist material layer to the unmasked area of the substrate, then applying a metal layer over the photoresist material layer and the substrate, and then applying a solvent to remove the photoresist material layer and said metal layer applied over said photoresist material layer to leave a plurality of metal layers superimposed over the unmasked area of the substrate; (c) removing the substrate to a depressed substrate surface between the metal layers formed in step (b) to form a plurality of pixels each having an upper metal layer; (d) superimposing an insulative layer over each of the metal layers formed in step (c); (e) forming a hole in at least one of the insulative layers formed in step (d) so as to expose the metal layer under the insulative layer; and (f) superim

Abstract: Pulse integration is utilized on board an optically guided missile or other ordinance device used as a part of a target designation system for extending the lock-on range of the missile by approximately 18%, when a double pulse laser is utilized to illuminate and designate the target. Pulse integration is accomplished with a recirculating delay unit which superimposes the first pulse on the second pulse, such that while the pulses add coherently, noise does not add in phase. The pulse integration technique therefore enhances the signal-to-noise ratio when the missile is at the outer limits of its operating range. When the missile is sufficiently close to the target, doublet decoding is actuated to offer countermeasure resistance. At this point, pulse integration may proceed in lieu of doublet decoding or may be dispensed with in view of the increased signal-to-noise ratio due to the close range of the missile to the target.

Abstract: The invention is a detection system and in one embodiment uses inexpensive, miniaturized sensors for detecting electric field (E-field) disturbances. Such sensors are easily and covertly deployable and have low power consumption. The devices may incorporate visual or audio alerts and can include communications hardware for transmitting data for further processing of the electrostatic events.

Abstract: The invention relates to a method of providing a seal between an aircraft structure (14) and a removable panel (26) mountable on the structure to close an opening (12) therein. According to the invention, the method comprises applying a sealant compound (28) for example a polysulphide rubber compound, to one of the structure and the panel, forming a rebate (46) in the sealant compound, and providing a sealant tape (48) to fit within the rebate. Subsequently, the panel is fastened to the structure with the seal (50) comprising the sealant compound and the sealant tape being sandwiched between the structure and the panel and encircling the opening.

Abstract: The increasing use of electrically powered vehicles has created a need for inexpensively and effectively measuring high currents for motor control, as for example digital motor control. Because the high operating voltages of traction motors, the motor current sensors should be non-contacting. A non-contacting current sensor having a rated capacity significantly less than the motor winding current is coupled to one or more of the conductors of a paralleled multiconductor motor winding for sensing the current in that conductor. The paralleled electrical motor conductors are paralleled by additional similar conductors, so that only a fraction of the current to be measured flows through the conductor(s) associated with the sensor. The current sensor elements may be mounted on a pc board, which supports the elements, and also has one or more printed patterns which define conductors associated with the sensor.

Abstract: An anti-torpedo torpedo having laser homing head, the torpedo being launched from a parent vessel or platform which itself houses the expensive to replace, the bulky, or the high power consuming parts of the laser, said parts being optically connected to an optical projector in the homing head in the torpedo itself and to any parts of the laser not housed in the parent vessel.

Abstract: A general purpose bomb having a shaped charge penetrator warhead mounted in the front of the bomb and facing forward, in which the caliber of the warhead is at least 90% of the caliber of the general purpose bomb.

Abstract: A conversionless direct detection system for detecting signals having a very large dynamic range, with a virtually unlimited bandwidth utilizes a successive detection approach having successive log amplifier gain stages, with each gain stage involving simultaneous use of an RF transistor to perform both limiting and logging functions. FET transistors are used to extend the operating range beyond 200 GHz, with the self-bias in combination with a drain resistor limiting voltage and current swings. A log video output is tapped off the source resistor and is coupled to a buffering stage, with the outputs of the buffering stage summed to accommodate very large dynamic range swings of the input voltage, with successive stages saturating at different points to operate at different and contiguous regions, thus to provide the wide dynamic range. The limited RF signal is tapped off the drain resistor, with the stages connected in series to provide the limited RF output as the output of the last stage.

Abstract: Apparatus for the improvement of inertial navigation system (INS) position/velocity comprises frame stores for storing sequential images from a video camera and a comparator for comparing pixels in predicted images, derived from earlier stored images as modified by INS linear and angular velocity outputs, with pixels in actual later stored images, to derive a velocity error correction signal which is used to correct the INS output. The video processing correction system described is passive and hence does not reveal the aircraft's whereabouts as would be the case with other positional correction systems using radar, nor does it rely on systems outside the control of the INS, e.g., GPS, nor is it reliant on a vast terrain feature database.

Abstract: The invention relates to a method of assembling a structure, particularly those structures requiring very tight tolerances. The structure may be assembled by positioning shim material on at least part of a sub-structure, curing the shim material in situ, machining the cured shim material to a desired thickness, and then assembling outer layer parts to the sub-structure such that the shim material is situated between the substructure and the outer parts. The shim material may be machined to different thicknesses at different locations on the sub-structure, so that, when assembled, the outer layer parts together conform to a predetermined profile. This is especially advantageous in the manufacture of airframes, where the outer layer panels must provide a smooth surface to avoid unwanted aerodynamic effects.

Abstract: Methods and apparatuses for a low EMI power supply. The power supply may include a control circuit, a power switch connected to the control circuit, an anti-parallel diode connected to the power switch, an inductor coupled to the anti-parallel diode, an output diode coupled to the inductor, and an output capacitor connected to the output diode. The power supply may include a series diode and no anti-parallel diode. The power supply provides a controllable and variable high voltage power supply from a small number of devices while, at the same time, producing low EMI. Power conversion is achieved at high efficiencies due to the recycling of energy in parasitic capacitance. Due to its low EMI, the power supply is particularly well suited for driving electronic devices such as avalanche photodiodes.