Abstract: A gas projection apparatus for disabling the engine of an automobile being ursued by, for example, a police cruiser. The gas projection apparatus comprises a housing having a charging chamber which receives carbon dioxide gas under pressure from an external source of supply. The charging chamber is partially sealed by a blast valve which is attached to a movable shaft centrally located within the housing. There is also attached to the movable shaft a diaphragm which is positioned in a rear chamber of the housing adjacent the charging chamber. Carbon dioxides from the charging chamber is supplied to the rear chamber exerting a force on the diaphragm. When the force exerted by carbon dioxide gas on the diaphragm exceeds a predetermined pressure level, the diaphragm moves the shaft unseating the blast valve which the pressurized carbon dioxide gas to enter a wave shaping chamber within the housing.

Abstract: Apparatus for providing a direct quantitative readout of the amplitudes of arious frequency lines that constitute the envelope of an amplitude-modulated broadband noise signal. A selected band of carrier frequencies is fed to an AGC circuit that provides a constant-input signal amplitude to a demodulator for a period of time that is greater than the period of the lowest frequency of the modulating signal for detection. The detected signal is fed to a spectrum analyzer for the direct reading of the percent modulation.

Abstract: A valve mechanism for an acoustic modulator which modulates air flowing tugh the acoustic modulator. The valve mechanism comprises a pair of cylindrical shaped members with each member having a plurality of elongated ports. The first cylindrical shaped member is held in a fixed position, while the second cylindrical shaped member is movable with respect to the first member. There is located at the lower end of the second cylindrical shaped member a drive coil which is positioned in a magnetic field such that when the coil is excited by an electrical sinusoidal input signal, movement of the second member occurs, partially aligning the ports of the second member with the ports of the first member which opens the valve mechanism. The sinusoidal input signal causes a frequency "doubling" to occur, that is the valve mechanism of the present invention completes an open-close-open-close cycle during each cycle of the sinusoidal input signal.

Abstract: A multipurpose bus interface comprising a digital signal processor which eives a clock signal and control signals from a Manchester type encoder/decoder and then processes the clock and control signals allowing for the serial transfer of data to and from the 1553 multiplex data bus, the encoder/decoder and the digital signal processor into an IC memory card for storage in or retrieval from the IC memory card. Software stored in an electrically erasable programmable read only memory controls how the data is transferred and interpreted making it easier to modify the digital signal processor's operation to accommodate its use with different bus standards and data protocols/formats. The encoder/decoder of the present invention formats and protocols data transferred from the electrically erasable programmable read only memory to the 1553 multiplex data bus as well data transferred from the 1553 multiplex data bus to the memory, as appropriate.

Abstract: An ultrasonic system for determining the quality of concrete under water hout inaccuracies caused by electromagnetic interference from the ultrasonic generator. An ultrasonic generator applies pulses to the concrete. An ultrasonic detector detects the ultrasonic pulses and produces corresponding signals that are indicative of ultrasonic pulses that have passed through the material. Signal processing circuitry processes the signals to determine the transit time of the ultrasonic pulses through the material. The signal processing circuitry is disabled for a predetermined time after application of each ultrasonic pulse to the material to prevent noise produced by the means for applying ultrasonic pulses to the material from entering the signal processing circuitry and causing spurious measurements.

Abstract: A measuring apparatus which accurately locates reinforcing bars in underwater concrete structures such as piers, retaining walls, easements and the like and measures the amount of concrete covering each reinforcing bar. The measuring apparus comprises a probe which generates a magnetic field and which is moved over the surface of the underwater concrete structure under test. When the poles of the magnetic field are in parallel alignment with and directly over a reinforcing bar within the structure a disturbance occurs in the magnetic field with the magnitude of the disturbance being indicative of the depth of concrete covering the reinforcing bar. An electronics module electrically coupled to the probe provides an analog output signal which is indicative of the distance between a reinforcing bar within the concrete structure under test and the probe.

Abstract: A digital interface for allowing a first device which receives and sends information serially to communicate with a second device which receives and sends information in parallel. The first device may be an encryption unit while the second device may be a relay/responder/reporter connected to a transmitter or a digital signal processing unit. The digital interface comprises an erasable programmable logic device which during an uplink data transfer performs the function of converting parallel logic signals, that is control signals and data words provided by the relay/responder/reporter, for example, to commands and data to be transmitted by a transmitter serially to the encryption unit. In a like manner, the erasable programmable memory device during a downlink data transfer converts serial commands and data received from the encryption unit by a receiver to a parallel format for transmission to the relay/responder/reporter.

Abstract: A method for allowing a correlation function to be applied to binary codes f length 3 to length 128. A user may specify the desired length of the binary codes for correlation processing; whether the binary code is to use a phase sidelobe level as the threshold or a sidelobe amplitude as the threshold. The user will also be asked to specify the threshold as well as an in phase coefficient referred to as alpha and an out of phase coefficient referred to as a beta. The user may also specify that the codes be expanded which results in correlated compounds having a length twice that of the specified length being displayed to the user. When the user has specified the parameters for correlation processing of the binary code length selected by the user, the program of the present invention will process the binary codes eliminating allomorphic and symmetrical forms of the codes from correlation and then display the results to the user.

Abstract: An electronics circuit for accurately digitizing an analog audio or like data signal into a digital equivalent signal by introducing dither into the analog signal and then subsequently removing the dither from the digitized signal prior to its conversion to an analog signal which is a substantial replica of the incoming analog audio or like data signal. The electronics circuit of the present invention is characterized by a first pseudo-random number generator which generates digital random noise signals or dither for addition to the digital equivalent signal and a second pseudo-random number generator which generates subtractive digital random noise signals for the subsequent removal of dither from the digital equivalent signal prior its conversion to the analog replica signal.

Abstract: An apparatus for measuring the length of fiber optic cable being deployed om a winch to an underwater environment. The cable deployment measuring apparatus of the present invention comprises a constant current generator for generating a direct current, a resistor array having a plurality of series connected resistors and a plurality of trip wires with one of the trip wires being connected across each of the resistors. The trip wires which function as short circuits are also attached to the cable at predetermined locations along the length of the cable. When the fiber optic cable is being deployed, each trip wire will break when the location at which the trip wire is positioned is unwound from the winch for deployment in the underwater environment. This, in turn, will cause flow through the resistor array with a resulting voltage drop across the array.

Abstract: A slave controller which provides the control signals for effecting the r and write operation of a memory electrically connected to the VERSA MODULE EUROPE bus (VMEbus). The slave controller comprises a programmable array logic device which receives control and address modifier signals from the data transfer bus within the VMEbus and an address enable signal from a decoding circuit. The decoding circuit, in turn, provides the address enable signal to the programmable array logic device in response to an address strobe signal supplied to the decoding circuit by the data transfer bus. The programmable array logic device being responsive to the control, address modifier and address enable signals enables the memory which for a read or write operation. The programmable array logic device next provides a write pulse to the memory when data is to be written into the memory at an address provided by the VMEbus.

Abstract: A rapid reprogramming terminal (RRT) adapted for communication with military aircraft MIL-STD-1553 multiplex data bus which includes generally four avionics and one electronic warfare bus on board each aircraft. The RRT may be used to reprogram all electronic warfare and avionics systems aboard and aircraft including the bus controllers for each avionics or electronic warfare bus and the remote terminals connected to each bus. The RRT includes a high speed digital signal processor which executes functions required to reprogram a remote terminal or bus controller through software stored in an electrically erasable programmable read only memory (EEPROM). The information required to reprogram a remote terminal or bus controller is stored on an IC memory card which is electrically coupled to the digital signal processor.

Abstract: A binary decision apparatus comprising a control unit which generates the nary decision apparatus' control signals from an operation code contained in the first byte of an instruction, a program counter which provides addressing for an external program memory, and a memory buffer register for holding digital instruction data provided by the external program memory. External control signals provided to the binary decision apparatus include a single phase system clock, a system reset signal and a wait signal that can be used to single-step the binary decision apparatus. Program instructions are provided from the external program memory to the binary decision apparatus via an eight-bit data bus, while an internal twelve-bit data bus routes digital information between the registers and counters of the binary decision apparatus.

Abstract: An underwater communications system comprising first and second communications modules which transmit and receive data utilizing infrared radiation. Each module has a transmitter/receiver which converts each received data byte to RS-232 formatted data for transmission to a computer. Each communication module also includes a timer for providing a forty kilohertz pulsed signal to modulation circuitry which passes the pulsed signal through the modulation circuitry when a logic zero is supplied to the modulation circuitry and which inhibits the pulsed signal when a logic one is supplied to the circuitry. That portion of the pulsed signal which passes through the modulation circuitry is provided to a light emitting diode which transmits a pulsed burst of infrared radiation to an infrared light detecting unit within the second communications module.

Abstract: An electromagnetic field sensor apparatus which measures the amplitude, pe, frequency and polarization of an incoming electromagnetic field as well as the angle of arrival of an incident electromagnetic field. A Luneberg lens focuses an incoming electromagnetic wave entering on one side of the Luneberg lens onto a point on the opposite side of the lens. A pair of photonic sensor which may be electro-optic modulators or Pockel cells are positioned on the Luneberg lens at the point upon which the incident electromagnetic wave is focused. The sensing axis of one of the electro-optic modulators is perpendicular to the sensing axis of the other electro-optic modulator. Polarized light is provided to each photonic sensor along an optical path which passes through the sensor. Each photonic sensor modulates the polarized light passing therethrough when the photonic sensor detects the incident electromagnetic wave.

Abstract: A stand alone multiple unit tracking system which utilizes a packet radio link to periodically transmit information identifying the geographic position of ships, aircraft and other land mobile vehicles. The stand alone multiple unit tracking system comprises a base station, relay stations and a plurality of remote stations placed on board ships, aircraft or the like. The remote stations transmit latitude and longitude position information to the base station through relay stations, if required, using packet radio techniques.

Abstract: A diver navigation system which provides reliable position information to able a diver to locate and when required repair existing underwater devices such as cables, leg moorings and the like. The diver navigation system comprises a synchronous range-range navigation system operating on a repeating timing cycle, which is accurately duplicated in a master transmitter, a slave transmitter and a receiver. Within the master and slave transmitter the timing cycle is subdivided into two equal approximately one second subcycles, the first subcycle being for the master transmitter and the second subcycle being for the slave transmitter. The master transmitter sends out a tone burst signal at the beginning of the first subcycle and the slave transmitter sends out a tone burst signal at the beginning of the second subcycle. Each tone burst signal, in turn, comprises a 34 kilohertz signal followed by a 32 kilohertz signal each of which has a time period of approximately one millisecond.

Abstract: An electromagnetic field sensor apparatus which measures the field strength and phase of an incident electromagnetic field as well as the angle of arrival of an incident electromagnetic field. The electromagnetic field sensor apparatus comprises a Luneberg lens which focuses an incoming planar electromagnetic wave entering on one side of the Luneberg lens onto a point on the opposite side of the lens. A photonic sensor is positioned on the Luneberg lens at the point upon which the electromagnetic wave is focused. A light source is located along an optical path which passes through the photonic sensor for transmitting polarized light through the sensor. The photonic sensor modulates the polarized light passing therethrough when the photonic sensor detects the incident electromagnetic wave. A photodetector located along the optical path detects the modulated light as it exists from the photonic sensor.

Abstract: A biodegradation apparatus comprising an enclosed vessel for holding a large volume of soil contaminated with hydrocarbons. Air diffusers uniformly within the vessel force moistened air through the vessel thereby removing volatile hydrocarbons from the contaminated soil. Outgoing air is supplied to vapor phase bioreactor for the removal of hydrocarbon contaminants from outgoing air. The outgoing air is next supplied to a granular activated carbon filter system which absorbs remaining hydrocarbons and then expels non-polluted air into the atmosphere concluding phase one treatment of the hydrocarbon contaminated soil. Phase two treatment of the hydrocarbon contaminated soil is initiated by utilizing high pressure injection nozzles to force water with surfactant additives through the soil thereby forming at the upper portion of the enclosed vessel a supernatant which includes hydrocarbon contaminants.

Abstract: A nonvolatile memory system is disclosed which will store a key or digital word for a period of time of approximately three years with minimum power consumption. The nonvolatile memory system includes a nonvolatile static random access memory for receiving and storing a key word from a loader, and a nonvolatile memory sequence control circuit which provides logic signals for controlling read and write operations of the nonvolatile static RAM, as well as logic signals to allow for transfer or down loading of the key word from the loader to the RAM. In addition, the nonvolatile memory sequence control circuit provides logic signals to interface with an encryption device which allows the key word to be transferrred or up loaded from the nonvolatile static RAM to the encryption device and logic signals for storing the key word in a nonvolatile electrically erasable programmable read only memory (PROM) and then bringing the nonvolatile static RAM to a low power standby state.