Abstract: A device for detecting and/or sweeping electrically controlled mines, which evice will provide an indication of the presence of a control cable connected to the mine, and will serve as a countermeasure for such mines, by selectively detonating same after cutting of its control line after the sweeping vessel is beyond the mine's effective range. The circuitry of the device includes a high D.C. voltage source connected with a capacitor so as to charge the capacitor through a protective current limiting resistor, whereby the voltage is caused to discharge through the control cable so as to indicate the presence of the mine. An insulated blade type grapple knife system, to prevent inadvertent shorting of the detonating circuit, is used in conjunction with a sensitivity adjustable magnetometer and a switch to provide the desired safety range to permit the cutter to sever the mine's control cable without endangering the tow vessel or its personnel.

Abstract: A thermal battery activated by external heat comprising an anode, e.g. composed of a lithium-aluminum alloy, a cathode, e.g. composed of iron disulfide, and an electrolyte, e.g. a lithium chloride-potassium chloride eutectic, the electrolyte being inactive at ambient temperature but being activated by melting at a predetermined temperature when exposed to external heating. The battery can be used as a sensor or to ignite pyrotechnic and power electronic devices, in a system for reducing the hazard of ordnance exposed to detrimental heating. A particular application is the use of the battery to activate a squib to function in conjunction with one or more other components, to vent an ordnance case, preventing its explosion in a fire.

Abstract: A proximity fuze system having a plurality of spatially disposed energy dctors, the response patterns of which overlap in such manner as to form an energy response "fence" for detection of an intruding object within a certain area. An explosive charge is also included in the system for disabling or destroying said intruding object, and a plurality of memories and gates are effectively connected between said detectors and explosive charge to effect the detonation thereof whenever said object is within such lethal range as to be sensed by predetermined pairs of said detectors.

Abstract: A progressive phase feed transmission line network for use with a Rotman-Turner lens is composed of a plurality of feed ports for receiving or transmitting energy from or to the lens, a pair of control ports, a plurality of different sets of transmission line segments with the segments in the same sets being of substantially equal lengths, and a plurality of power directors for splitting or combining energy depending upon whether the network is operating in a "receive" or "transmit" mode. Different phase delays are interposed in the network to provide a passive arrangement which can operate in the "receive" mode to determine directionality of energy received by an antenna array and fed through a Rotman-Turner lens to the transmission line network or can operate in the "transmit" mode in combination with adjusting of a phase shifter to directionally steer the energy launched into space by the antenna array after being fed from the network through the lens to the antenna array.

Abstract: Two electrodes attached to the hull of a ship, one electrically connected ereto and one insulated therefrom, are employed to transmit, via sea water, an electrical signal. The current return of the signal passing through the ship's hull generates a magnetic field corresponding to the electrical signal. The magnetic field is effective to cause detonation of magnetically triggered naval ordnance at a range greater than the optimum range at which the ordinance would detonate in the absence of said generated magnetic field.

Abstract: This invention discloses a magnetic field generator employing a direct cunt electromagnetic coil which is swept through a predetermined area by a drive motor and transmission means. Circuit means are disclosed to periodically reverse the polarity of the generated magnetic field either in synchronism with the sweeping of the electromagnetic coil or at a time related frequency.

Abstract: A system for degaussing ships includes a floating cable having a plurality f insulated conductors, the cable extending between a barge at one end and an end float at the other end, with a floating saddle member mounted at the mid-portion for engagement by a ship's bow. The cable ends are brought together at the barge, the conductors connected in series with one another and energized by a generator on the barge.

Abstract: A device for correcting the flight path of an air to surface missile and ding said missile to a target. A first map of a strip of ground which is transverse to the direction of flight is provided on a rotatable drum along with a second map of a strip of ground which is parallel with the direction of flight. A live image of the ground over which said missile is traveling is projected first through the first map to provide a position fix of the missile in range and azimuth relative to a target and after a correction has been made to the flight path of the missile, the live image of the ground is projected through the second map to provide guidance correction to direct the missile to the target.

Abstract: A method and means for protecting ships from torpedo attack having an expive weapon which may be launched overboard as soon as feasible after the detection of said attacking torpedo. The aforesaid weapon contains explosive means as well as steering, depth, and speed control means that are regulated by programmed controls, respectively, which are set prior to the launching of the weapon and thereby cause it to traverse and maintain a probable collision course with said torpedo.

Abstract: The invention is a new design for a structure such as a stack for exhaust hot gases. One embodiment is that of the top portion of a ship's stack (the watchcap) for exhausting a hot steam plant, a gas turbine, a diesel or other engine, or burner exhaust gases. The function of the invention is to reduce the infrared radiation generated by the hot metal of the exhaust pipe and surrounding structure. This function is accomplished by constructing an annular plenum chamber around a portion of the length of the smokepipe. The plenum chamber has air flow channels, an arrangement of insulation, and openings, top and bottom, so that convective air flow is established at the hot smokepipe wall. The thermal gradient produced also induces a secondary cool-air-flow along an outer wall. Another feature is an arrangement of a double-walled shield extending above, below, and around the terminal end of the smokepipe that blocks the low angle view into the hot smokepipe.

Abstract: Apparatus is disclosed for detecting partially submerged wires and determng the location of the above water portion thereof by injecting into the submerged portion a radio frequency electrical signal, and utilizing radio direction finders to obtain a fix on the resulting radiating above water portion. An insulation cutting probe is used, and a radio frequency injection signal generator is described that minimizes power loss to the water medium.

Abstract: Object detecting and classifying apparatus is disclosed wherein signals, ulting from electromagnetic coupling between a search unit and an elongated, narrow, conductive object, are processed so as to provide automatic indication of detection of an object of the type mentioned. The apparatus discriminates against false indications from background and spurious signals and against signals from objects of other types by utilizing search unit means that produces successive signals having predetermined time relation to one another only when an object of the class sought is crossed, together with signal processing logic means responsive thereto, and recording and/or indicating means responsive to the logic means.

Abstract: The present invention relates generally to submarine simulating decoy and particular is a sonar system for receiving the acoustical search pulse from an enemy or other vehicle and converting it into a dopplerized sonar signal which is then broadcast back to the enemy vessel for deception and tactical combat purposes.

Abstract: A high security lock assembly having a tang for holding lock shackle pins, ith said tang being attached to a first member, such as a bulkhead or a door jamb. A reversible cover, which can be attached to either the left or right side of a second member, such as a door or cover, is attached, as by welding, with a hasp liner. The hasp liner has a side opening sufficiently large to clear the tang and lock shackle pins, but too small for a lock to pass therethrough. The bottom of the hasp liner is open to receive a lock which is engageable with the lock shackle pins to secure the second member with the first member. The reversible cover is provided with a flange which can be welded directly to a door, cover, or hinge.

Abstract: A target tracking sonar system associated with a moving platform incorporates a Kalman filter model and a false target detection capability characterized by comparison of the estimated and actual acceleration to produce an error value which, if greater than a predetermined threshold, namely the product of one half the estimated acceleration and the internal between periodic acceleration updates, generates a signal condition to flag the false target.

Abstract: A combination of integrated circuit (IC) flatpacs used in combination to tch selected sonar microphone inputs from a circular receiving array to position a beam containing a sounding target intermediate to an equal number of left and right microphone pickups and selectively switching through weighted delay circuits for beam forming to present the target in this receiving beam electronically on a flat display with digital control of "coarse" seven and one-half degrees and "fine" one-tenth degree increments to provide a display of the bearing of the target.

Abstract: A shaped charge that relates generally to metal moving warheads and which s as an improvement a means of increasing the explosive energy in a metal moving warhead by providing an air gap between the explosive and the metal to be displaced thereby providing, upon detonation of the explosive charge, the formation of a high velocity jet of intensified energy that makes a superior shaped charge device for use in piercing or deforming solid material.

Abstract: In a continuously variable slope delta modulation encoder or decoder, the slope of a reconstructed signal is varied by selecting the charging voltage across an integrating capacitor. For an NTSC video signal, the charging voltage may be selected by a shift register connected to a voltage divider supplying the integrating capacitor.

Abstract: A sonar system is disclosed that includes contiguously angularly disposed d oppositely rotated transmitting and receiving transducers for broadcasting an acoustic signal and for receiving target echoes thereof, respectively, at different angles from within overlapping zones thereof within an aqueous medium. A gated transmitter is employed to timely energize said transmitting transducer, and a gated target seeking receiver is employed to process the output signal of said receiving transducer. A cathode ray tube readout displays target signals from said receiver. A light sensitive probe produces an electrical output signal in response to a target signal displayed on said cathode ray tube which is used for gating the aforesaid transmitter and receiver in such manner as to accentuate the displayed target signal being probed at any given instant.

Abstract: A doppler compensated sonar system is disclosed as including a transmitter nd a receiver. The receiver of the disclosed preferred embodiment is a single channel receiver which incorporates a mixer and a narrow pass band filter connected in series therein. A phase lock loop of the negative feedback type is connected between the control input and the output of said mixer which effectively determines the occurrence of any doppler effects being processed in said receiver channel and compensates therefor by appropriate adjustment of the frequency of the signal supplied to the control input of said mixer, thereby causing the remainder of said receiver channel, including said narrow band pass filter, to process received target signals without any doppler effects being present therein.