Abstract: A multilevel sidelobe canceller utilizes power level sensitive processing of the auxiliary array outputs to adaptively spatially filter multiple jamming signals with an additional level of adaptive loops prior to conventional sidelobe cancellation.

Abstract: A low offset AC correlator avoids DC offset and low frequency noise by frequency operating the correlation signal so that low noise, low level AC amplification can be substituted for DC amplification. Subsequently, the high level AC signal is demodulated to a DC level.

Abstract: A dual class amphibious target discriminator distinguishes between waterborne carriers and bottom traversing fording vehicles. The distinction is accomplished by examining the seismic signal produced by a candidate target for significant characteristics unique to the specific targets.

Abstract: A self synchronizing convolver system includes a surface acoustic wave convolver excited by an appropriate reference such as an even function waveform so that the reference waveform is combined with the signal waveform in a manner yielding the complete correlation function independent of the time of arrival of the signal thereby permitting asynchronous operation.

Abstract: The high-power, short-pulse array is a self-contained radiating oscillator system which radiates a high peak-power pulse of radio frequency energy. The radiated pulses contain only a few cycles of RF and hence it is a short-pulse emitter. The device contains a chain or a series of loops which radiate in phase and each loop has a spark gap. The spark gaps are sequentially fired. The radiated waveform can be a single pulse of RF or a train of RF pulses. The device requires only a high voltage power supply for operation.

Abstract: The acceleration of large numbers of ions to high energies uses an intense relativistic electron beam produced by a vacuum diode. An electron beam radial profile is maintained by a strong longitudinal magnetic field. A virtual cathode, characterized by an electrostatic potential depression whose depth corresponds to the injected electron beam kinetic energy will form. The virtual cathode is caused to move backwards toward the vacuum diode by utilizing the time history of the injected electron beam voltage and current, and by appropriately flaring the drift tube. Ions trapped in the potential well associated with the virtual cathode move with the virtual cathode and are synchronously accelerated.

Abstract: A pulsed laser densitometer system measures highly optically dense samples. A pulsed laser beam pulse is split so that part of the beam pulse is directed through an optical delay path. The delayed beam pulse is then brought into the same path as the beam pulse transmitted through the sample and both beam pulses are fed through a detector. The output of the detector contains the optical density information in the ratio of the pulse amplitude of the transmitted pulse to the delayed pulse.

Abstract: A weight multiplier for use in an adaptive processor. The input signal from a tapped delay line is split in a 3 dB hybrid into two equal level and equal phase signals. Each signal is fed to a mixer together with a signal performing the function of an oscillator signal. Output signals from the mixer are subtracted in a broadband hybrid. The result of this subtractor is then fed to a summer to supply a loop feedback signal.

Abstract: A higher order mode, simplex, fiber optics T-coupler is based on using only the higher order lossy modes of single fiber optics whether the cable is single fiber or a fiber bundle. This allows for T-couplers that discriminate on modes.

Abstract: A polarization radar method and system employs polarization discrimination to obtain target-to-clutter enhancement. The polarization of the radar is rotated at very fast rates. The polarization is rotated at least 360.degree. during one pulse and discrimination is obtained with a single pulse operation. In the system, the receiver is tuned to a frequency that was not radiated by the radar's transmitting antenna.

Abstract: A process for the simultaneous fabrication of CMOS transistors and bipolar devices on the same integrated circuit. The process follows the standard Silicon-Gate Deep Depletion technology up through gate definition. An additional mask step is included for definition of the base implant region. After the base diffusion the process again follows the standard approach resulting in a new structure which permits the fabrication of CMOS/SOS as well as a bipolar driver transistor.

Abstract: A tapered crystal for use in a laser modulator in a communication system reduces switching voltage and driving power requirements. Alternately, the crystals are tapered for reduced crystal capacitance, thus decreasing the modulator rise time.

Abstract: A pulse peak sample and hold circuit includes a passive input integrator to develop the time of a sample gate. A sensitive comparator develops the gate pulse. A FET and storage capacitor "holds" the actual input amplitude. The circuit is independent of PRF and pulse width.

Abstract: A frequency agility radar having automatic electronic front end tuning in synchronism with the transmitter on a pulse to pulse basis is provided. The automatic electronic front end tuning is achieved by the use of a backward wave parametric amplifier. The frequency generated by the radar transmitter is employed to control the center frequency of backward wave amplifier. The backward wave amplifier operates as an electronically tuned filter with the center frequency of the tuner following the radar frequency accurately.

Abstract: A method of hermetically sealing semiconductor devices utilizes a dielectric tube with a two step structure at one end. The tube is used to surround a semiconductor. The two step end of the tube is metallized. The other end of the tube is flat and is brazed onto a metal stud so that the semiconductor is in the center of the brazed joint. A metal lid is painted with a conductive material and then placed into a rim formed by the two step end. When the paint dries, a metal layer is electrodeposited at the top of the lid and tube.

Abstract: A real time data rate quantizer and analog-to-digital converter system employs an electron beam which is deflected by an analog input waveform. The deflected electron beam strikes a mosaic target in which electron beam sensitive elements detect and quantize the signal. The outputs of the detectors feed an encoder resulting in a binary digital output waveform.

Abstract: An apparatus is provided for increasing heat transfer from an object at a temperature above ambient by directing a localized corona discharge toward the heated object.

Abstract: An integrable circuit incorporated with charge-coupled devices to stabilize the surface potential against oxide charging effects by regulating the applied gate voltage. By incorporating the circuit with charge-coupled devices, the complete integrated unit is effectively radiation hardened over an extended range of operation.

Abstract: A method for determining the ionospheric reflection height from doppler measurements made over an oblique radio transmission involving reflection of signals from a boundary. This method makes use of multi-hop reflections. The unknown motion of the reflection boundary is eliminated by taking the doppler-shift ratio for a pair of transmission hops. The height of the reflection boundary may be computed from this ratio for the particular distance that separates transmitter from receiver. The equations used follow from relatively simple geometrical considerations derived from spherical boundaries.

Abstract: A discriminating sensor for contact fuzing capable of discriminating between vibrations in flight and terminal impact includes one or more mass-spring systems constituting the moving portion of the sensor. Each mass-spring system is provided with controlled damping. The masses restrained by springs are displaced upon terminal impact to close an electric circuit. Each mass-spring system is provided with controlled damping so that the circuit will not be closed under frequently repeated perturbations or vibrations in flight. One form of damping is by one or more permanent magnets so placed that the magnetic force exerted on the moving mass opposes the motion in either direction.