Abstract: A wound core assembly and a method of manufacturing wherein the coil windings are cast and interconnected within the insulated chambers and end conductor molds. The insulated chambers act as the mold and subsequent insulation for the straight wire sections of each coil winding. After alignment of end conductor molds to connect predetermined chambers, coil windings are cast, the end conductors being formed within the passages of the end conductor molds.

Abstract: An inertial navigation system (INS) and a monopulse radar system are mounted on a body. The inertial navigation system outputs at least a velocity of the body. Either a synthetic aperture radar (SAR) map or doppler beam sharpening (DBS) map is created using the outputs of the monopulse radar system. The monopulse radar system outputs at least a summation output, an azimuth difference and an elevation difference associated with an object detected in either the SAR or DBS map. The position processor of the system and method of the present invention, however, only inputs the summation output and one of the azimuth difference and election difference. The position processor determines the other of the azimuth difference and the elevation difference by converting the velocity output by the INS into a doppler angle .theta. (the angle between the velocity, a vector, and a line connecting the object and the body) and determining either the azimuth difference or the elevation difference from the doppler angle .theta..

Abstract: A tapered notch antenna structural panel array that can serve both as a structural member and an antenna is made from an injection molded monolithic three dimensional grid of thermoplastic material. The notch and feed line is in the form of microstrip or stripline circuitry formed to the sidewalls of adjacent cells. Dielectric sheets of material are bonded to the upper and lower edges of the grid. Interconnect circuitry on the antenna ground plane is supported by the sheet bonded to the lower edge and connected to the antenna circuitry of the sidewalls.

Abstract: A missile launcher for use on a surface vessel includes an array of vertical sleeves each being of a size to receive a missile carrying container. The sleeves are maintained in a linear array by means of a series of frames and the lower, or breech, ends of the sleeves are collectively connected to a plenum into which water is injected during a hot launch of a missile. A selected one of the sleeves does not carry a missile but rather, functions as an exhaust or gas take up for the exhaust gases of the other missiles.

Abstract: An excitation circuit for an electrodeless light bulb which includes an RF source, a driver amplifier, and a load matching network and where the frequency of the RF energy generated by the source is swept over a predetermined frequency range in a controlled manner by a programmable frequency controller to cover the entire range of possible load match tuning conditions so that the electrodeless bulb will be substantially matched at all times to the source at some frequency in the sweep range.

Abstract: An electrodeless light bulb assembly including a case or housing supporting an electrodeless light bulb as well as a convection type heat exchanger. A solid state RF driver circuit is located inside the housing and connects to an excitation coil wrapped around the light bulb. The excitation coil comprises a metal heat pipe so as to provide an efficient thermal transport mechanism for the heat generated by the coil and the heat radiated thereto from the electrodeless bulb to the heat exchanger in addition to generating an RF excitation field for the electrodeless light bulb.

Abstract: A cooling system for a missile launcher having a plurality of missile-containing cells connected to a common plenum. Disposed in the plenum beneath each missile is an impingement plate in the path of hot exhaust gas from the missile. A cooling water injection nozzle is arranged below each impingement plate and is supplied with cooling water during a hot missile launch to cool the hot exhaust gas and the plenum.

Abstract: Crystals formed of a solid-solution of NiSiF.sub.6 6H.sub.2 O provide very good materials for filtering ultraviolet light and will not deteriorate in temperatures as high as 115.degree. C. They are particularly useful in sensing devices which seek to identify the presence of ultraviolet light in the UV missile warning band.

Abstract: An apparatus and method for improving stability in a transmitter receiving a staggered pulse train includes maintaining a constant temperature of the transmitter at the start of each pulse of the pulse train. Such maintenance may be accomplished by inserting "false", "phantom" or "synthetic" pulses into the pulse train. These pulses may be inserted between pulses, prior to a cooler pulse, or after a hotter pulse. The inserted pulses are then gated out prior to the final RF transmission.

Abstract: An electric vehicle propulsion system having a motor with first and second electrically isolated windings and a system control unit for controlling the motor, wherein the system control unit includes a first power bridge for driving the first windings and a second power bridge for driving the second windings.

Abstract: A silicon carbide gate turn off thyristor (GTO) has a silicon carbide junction field effect transistor (JFET) connected between the gate of the GTO and one of its anode or cathode electrodes thereby minimizing cooling requirements while providing for rapid switching.

Abstract: An acousto-optic tunable filter (AOTF) has one or more optical wavelength passbands dependent on the frequency or frequencies of a radio frequency signal applied thereto. A radio frequency generator applies the radio frequency signal under computer control of the RF frequency so that the radio frequency signal has one or more preselected frequency components. An input optics system directs incident object or scene light to the AOTF. A first polarizing element passes to the AOTF only image light which is polarized in a first direction. A second polarizing element receives output image light from the AOTF and passes only image light which is polarized in a direction orthogonal to the first direction. The image light passed by the second polarizing element is detected by a camera. An output optics system focusses image light passed by the second polarizer on an image plane of the camera, and an image corresponding to the detected image light is recorded.

Abstract: A dual notch radiating antenna includes a pair of notch cavities having respective slow wave structures extending into the notch cavities. The slow wave structures effectively shorten the length of the dual notch antenna. The dual notch antenna also includes a pair of front end impedance transformers respectively coupled to open ends of the notch cavities. A passageway is coupled between the impedance transformers near the open ends of the corresponding notch cavities. The passageway provides an alternative shorter path for leakage current from one notch cavity to the other notch cavity, thus greatly reducing the likelihood of an effective short circuit occurring at a signal supply port of the dual notch antenna.

Abstract: A planar phase shifter having plural layers of ferrite forming a closed magnetic toroidal path and including internal layers of dielectric material of a relatively high dielectric constant and underlying layers of dielectric material having a relatively low dielectric constant. A stripline to slot line transition is also formed at least at one end of the device. All of the elements are formed over a ground plane and have either metallized external sidewalls or a set of metallized vias running through the outer wall portions over its length.

Abstract: A semiconductor wafer and a method of forming vias in a semiconductor wafer having opposite first and second planar surfaces and predetermined thickness includes forming a plurality of first channels of first predetermined depth along a first direction in the first planar surface of the semiconductor wafer and forming a plurality of second channels of second predetermined depth along a second direction in the second planar surface of the semiconductor wafer. The first and second predetermined depths of the channels are selected such that vias are formed through the semiconductor wafer. The channels may be formed by saw cutting or scribing the planar surfaces of the semiconductor wafer. A plurality of circuit devices may be formed on the first planar surface of the semiconductor wafer prior to forming the plurality of first and second channels.

Abstract: The invention provides for a field effect transistor (FET) which includes a substrate and a buffer layer formed upon the substrate and an active layer formed upon the buffer layer. The active layer includes a gate region, drain region and source region. In addition, a channel region is formed in the active layer intermediate the source region and drain region. The channel region includes a first portion of reduced thickness adjacent the drain region. The active layer may include a recess adjacent the drain region to provide the thin channel region. Preferably, the thickness of the first portion of the channel region is equal to the undepleted channel thickness within the second portion of the channel region adjacent the first portion. The substrate, buffer layer, active layer, and degenerate layers are preferably fabricated of silicon carbide or gallium nitride. Further, the FET preferably includes a p type buffer, n type active layer, and n+ degenerate layers.

Abstract: An interferometric moving target radar imaging system includes a plurality of simultaneously operating apertures, receivers and processing channels which together coherently process RF return signals to image a moving vehicle. The system corrects for the different phase centers of the apertures and interferometrically combines the return signals from different apertures to attenuate the energy from stationary objects. The true azimuth location of the moving vehicle within main beam clutter spread is then determined which facilitates distinguishing between slow moving and stationary objects to detect the moving objects which are then tracked and imaged in the range doppler domain.

Abstract: An end of a composite cylinder is formed about an end connection assembly having two longitudinally arranged pieces having a contour which prevents the withdrawal of the end connection assembly from the cylinder. The two pieces of the end connection assembly are relatively forced apart and a snap ring having a certain rest diameter is reduced in diameter and inserted into the end connection assembly to a position between the pieces. The snap ring then assumes its rest diameter positioned between the pieces, forcing them to maintain intimate contact with the inner surface of the cylinder, thus removing any residual gap from the assembly process and/or preloading the interface between the end of the composite cylinder and the end assembly prior to application of an axial load.

Abstract: A heat dissipating module and package for power microwave transistors and method of making same that includes a substrate having a thick copper layer bonded to a ceramic core which is thereto subjected to high processing temperatures.

Abstract: An improved flatplate array antenna has a polarizer lens positioned adjacent the array. The polarizer lens is made of at least one dielectric sheet having an upper half and a lower half. Each half contains a set of parallel meanderlines positioned so that vertically or horizontally polarized RF energy emitted from the array passes through the lens and undergoes a phase advance or a phase retard, so that the RF energy passing through the upper half becomes circularly polarized in one direction and the RF energy passing through the lower half becomes circularly polarized in an opposite direction.