Abstract: An InP/SiO.sub.2 insulated gate field effect transistor which exhibits power gain at microwave frequencies is manufactured by using an n-type epitaxial semiconducting InP film on a semi-insulating InP substrate and depositing a pyrolytic silicon dioxide insulating film on the conducting InP film to form the gate insulator.

Abstract: 1. In a guided missile fuze system that has optimum kill probability against all sizes of targets, the combination comprising:(a) a fuzing channel for generating an output pulse in response to a received target signal after a predetermined time delay from the time said target signal is received,(b) a guard channel for generating an output pulse in response to the loss of a target signal detected by said guard channel,(c) and a firing circuit coupled to the outputs of said fuzing channel and said guard channel for firing the fuze in response to a firing pulse received from either of said channels.

Abstract: An automatic means for decoding a wide data range of Manchester code data. Variable delay means are provided for the Manchester code decoder which are digitally controlled in response to the output of a data rate sensing circuit that provides a digital equivalent of the sensed data rate. The digital equivalent of the sensed data rate is used to optimize the amount of delay in the Manchester code decoder for the particular data rate of the data being received.

Abstract: A transmitting antenna that can be inflated with air or a liquid dielectric nd floated in seawater. It consists of a cuplike cavity backing a radiating annular slot antenna. It can be used to communicate to submarines or surface ships or as a navigation transmitting antenna. It is small compared to the wavelength of the operating frequency.

Abstract: A reliable, repeatable and stable generator capable of producing noise with nown or given amplitude probability distributions up to 96 dB dynamic range, commonly found in atmospheric noise VLF/LF frequency bands. A continuous impulse noise amplitude probability distribution is digitally synthesized in a piece-wise fashion in 6 dB amplitude increments. These increments are linearly combined with a digitally generated Gaussian noise component for simulation of VLF and LF atmospheric noise.

Abstract: A directional loop array antenna for very low frequency (VLF) reception. array comprises four closely spaced loop antennas forming a unidirectional reception pattern with a main beam of less than 43.degree. between half power points. The array combines two double loop coaxial antennas dispersed with their axis parallel along 45.degree. lines. The signal from one double loop array is delayed sufficiently such that a unidirectional reception pattern is formed.

Abstract: A logic circuit for decoding parallel BCD output from a time code generator o operate an analog event marker pen on a strip chart recorder, every one minute a one second pulse, every ten minutes a ten second pulse, and every hour a sixty-one second pulse output is generated.

Abstract: A method for the thinning and automatic leveling of layers of a semicondur for use in device fabrication applications. The method is to be employed with anodic thinning wherein a conducting semiconductor layer on a high resistivity substrate is placed in a suitable electrolyte and voltage is applied so that the sample is made positive with respect to a cathode, also immersed in the electrolyte. The instant method is directed to the anodic thinning of irregularities in the semiconductor by slowly immersing the semiconductor into the electrolyte such that the location of irregularities can be determined and processed by monitoring the anodic process.

Abstract: Two pyroelectric vidicons are adapted to alternately receive infrared ene radiated from an object by means of a rotating half circle mirror and fixed mirror arrangement. The alternations of the infrared energy received between the two vidicons are synchronized by means of a synchronization and drive circuit adapted to receive frame sync pulses from the camera circuitry. By this arrangement, information is received by the camera 100% of the time.

Abstract: An InP/SiO.sub.2 insulated gate field effect transistor which exhibits power gain at microwave frequencies is manufactured by using an n-type epitaxial semiconducting InP film on a semi-insulating InP substrate and depositing a pyrolytic silicon dioxide insulating film on the conducting InP film to form the gate insulator.

Abstract: A voltage level shifting device for interfacing systems using positive logic levels and systems using negative logic levels. The circuit is so configured that the output of the device can be connected in parallel with a similar device in wired-OR operation and that a short circuit of the output will not cause excessive current flow, and damaging the circuit components.

Abstract: A method and means of assessing the effects of the lower atmosphere on the performance capabilities of a variety of electromagnetic systems. Environmental data is entered manually into a computer by means of a keyboard or on digital tapes in cassette form. A mathematical model is selected and will generate the type of display desired when the required information and a specific electromagnetic system of interest is selected. A display will appear on the graphics-display screen from which hard copies can be made for use in deploying and making tactical decisions as to stationing of assets.

Abstract: A digital C/kT meter for measuring the ratio of carrier power to noise po in a one Hz bandwidth and provide the results to a continuous read-out digital display. The circuit receives an input signal from the i-f amplifier prior to demodulation. The signal is amplified and fed to a mixer where it is converted down to a lower frequency. The mixer supplies the signal to a power divider through a voltage controlled attenuator where the signal is split into a noise power channel and a carrier power channel. The noise signal is filtered, amplified and fed to a detector/amplifier. The output of the detector/amplifier is integrated and fed back to the voltage controlled attenuator to form an automatic gain control feedback loop such that the noise power level output of the bandpass filter and amplifier is held constant. The carrier power is measured in the carrier channel similar to that of the noise channel except that the voltage controlled attenuator is in the carrier channel only.

Abstract: A method of manufacturing three dimensional integrated circuits from compatible co-fireable materials by extruding batched co-fireable materials to form blocks of specified cross-sections, selecting and stacking cross-section of various widths from different blocks in a specified manner to form the desired circuit and placing the stack in a furnace having a predetermined temperature time profile to properly sinter each of the materials.

Abstract: A method and means of link coupling to a tuned circuit in which the link ctance and the coupling coefficient are separately controlled. Mutual and direct coupling is utilized to effect this result.

Abstract: A method and means of monitoring the quality of a fluid dielectric capacitor by measuring the Kerr signal of a dielectric fluid which has the desired dielectric and breakdown properties and continually measuring the Kerr signal of the same fluid dielectric while in use to determine if there is any degradation of the fluid in use. The means for measuring the Kerr signal is by projecting a high intensity light beam such as from a laser source through the dielectric fluid of a capacitor between two of the plates and detecting the amount of light passed through the dielectric which is an indication of the condition of the dielectric liquid.

Abstract: High speed manchester encoding is provided by latching input data by means f a first clock pulse to provide a synchronized data source. This synchronized data is latched and inverted in a second latch circuit by a second clock pulse 180.degree. out of phase with the first clock pulse. The synchronized and inverted data is fed to a multiplexer where either data or data is selected depending on the state of the master clock applied to the select input of the multiplexer. The output from the multiplexer is the manchester encoded data stream.

Abstract: In a method for inferring the refractive index profile of the lower atmosphere a signal pattern comprising interference nulls is observed by receiving a signal from a satellite transmitter over a period of time. Hypothetical signal patterns are successively calculated by hypothesizing the validity of different refractive index profiles and compared with the observed signal pattern until one of them matches the observed signal pattern to within a selected limit of error.

Abstract: Narrow-band detection of optical signals over a large field of view wherein the selective reflecting power of metallic vapors is employed. A modulated carrier signal to be detected is directed to a Brewster window of an enclosure containing a vapor such as mercury. Only the incident light of interest is reflected through an exit window and detected by means of a photo-multiplier.

Abstract: A light emitting diode with emission wavelength in the 1.06.mu.m region suitable for use with the 1.06.mu.m transmission window in optical fibers. The diode is fabricated by liquid phase epitaxial growth of p and n type InAs.sub.x P.sub.1-x layers on InP substrates.