Abstract: A remote action mine, particularly a projectile-launching anti-tank remote action mine which includes a sensor logic for the obtention of a firing signal. The mine is equipped with a range finder and with a memory storage for the initial and final values of at least one range of action which is dependent upon the distance of the axis of action of the mine, with the suppression of the delivery of firing signals for target distances which are located outside of the stored range of action.

Abstract: A directional mine for combatting armored vehicles includes a projectile having a propelling device and a warhead; a support structure positioning the projectile prior to launching the projectile therefrom and electric circuitry for serving the projectile. There is further provided an arming unit including a battery, and an igniter accommodated in a housing insertable into and removable from the support structure; an ejector for pushing the housing out of the support structure; a locking device for retaining the housing in the inserted position and for preventing the ejector from becoming effective; a timer for placing the locking device in a releasing state after a predetermined period for allowing the ejector to push the housing outwardly; and electrical contacts mounted in the support structure and on the housing. Respective contacts are in engagement with one another in the inserted position of the housing.

Abstract: A mine for use against armored vehicles has a mount with a base resting on the ground and an ammunition launching tube having a fixed elevation and carried by the base for rotation about a vertical axis. The base contains a system for detection and azimuth location of targets which uses both seismic and acoustic detection. The tube is aimed in azimuth toward the target and an anti-tank ammunition is fired toward the position where the distance between the mine and the target is minimum. The ammunition consists of a self-propelled missile which will fly over the target at a high speed. The motor of the missile spins it about its roll axis. The self forging charge of the missile has an axis transversal to the roll axis. The missile has a detection system including a sensor which scans the ground about the roll axis and causes firing of the charge when aligned with the target.

Abstract: A magnetic sensor arrangement for monitoring movement of a vehicle on a path includes a three-axis accelerometer (1) and a processing circuit (2) for evaluating the vector product Hp of magnetic field vectors measured by the accelerometer when the vehicle is at two successive positions on the path. The vector product is utilized to evaluate a parameter related to vehicle trajectory. The arrangement may be used to generate a firing signal in an explosive mine or for monitoring a flow of vehicles along the path.

Abstract: A distance-measuring arrangement including transmission means for transmitting a wave in a measuring field, receiving means for receiving the wave reflected from a moving body moving in the measuring field and for producing a beat signal from the Doppler frequency. Delimiting means is provided for forming, in the measuring field, at least two datum lines (Ca and Cb) and processing means is provided for processing the distance information obtained from measuring the Doppler frequencies at the instants when the moving body crosses the datum lines. The delimiting means are formed from thermal detectors disposed in an optical assembly having at least two optical axes for defining the datum lines. A timing circuit is provided for defining the instants at which the moving body crosses the datum lines and for applying this information to the processing means.

Abstract: A mine including a seismic or vibration-responsive alarm sensor for a triggering sensor adapted to initiate a detonating signal. The mine is equipped with a reversible electrically-actuatable securing arrangement for the emission of the triggering or detonating signal, which can be reset through the intermediary of the alarm sensor from its armed position into the secured condition.

Abstract: A re-securable mine including a triggering or ignition circuit which is actuatable through the intermediary of a trigger securing arrangement. A re-securing block with a comparator is provided for a pregiven information or code and for an introduceable information or code, so as to reset the securing arrangement into the secured position at a pregivable relationship between the two informations or codes.

Abstract: A weapon control for a droppable weapon such as a bomb, has at least two sors for producing impact related or environment related signals for a microcomputer forming part of the weapon. The microcomputer evaluates the signals received from the sensors for producing different control signals for different situations as signified by the sensor produced signals. If the weapon has hit a hard target surface the responsive control signal detonates the weapon instantly. If the weapon got stuck in a soft target, the weapon is placed into a lurking state for a later detonation or defusing.

Abstract: A device for detonating a rolling mine upon impact or collision with a target by a linkage of sensors which detect physical criteria independent of each other in a sequence predetermined in time, a signal processor connected thereto delivering a firing signal for detonating the mine at the proper time.

Abstract: Geophone apparatus for receiving seismic signals due to an approaching vehicle, and giving an output when the signals are those characteristic of a heavy vehicle.

Abstract: The invention relates to a sensor-carrier which is transported by a useful load projectile to a predetermined target region which may be inaccessible and is set down in said region. For the purpose of avoiding damaging the sensitive sensor, the latter is, together with the sensor support, compactly mounted in a folded retracted condition in a rugged housing and is automatically projected out of the housing in an erected, extended position when the sensor-carrier is set down and the housing is opened. The sensor support consists of a plurality of rotationally symmetrical support members which are strung on a steel cable in a manner similar to a pearl necklace. The steel cable is surrounded by a sheathing and is connected via a disc to a coil spring for tensioning the steel cable. The sensor-carrier serves to position the sensor in an elevated position over the ground surface for improving its sensing and transmitting capabilities.

Abstract: In combination: an air core coil; a passive detector connected to said coil for giving a first output in response to change in the ambient magnetic field due to movement of a magnetic body near the coil; an active detector connected to the same coil and operable to create a local magnetic field about the coil and to give a second output in response to changes in the local field due to the movement of the body; apparatus energizing the active detector in response to the output of the passive detector; and apparatus giving a further output in response to simultaneous outputs from both the detectors.

Abstract: Arrangement for a land mine which is provided with at least one magnetic field sensing device which is arranged to initiate detonation of the mine when a change in the magnetic field is sensed. A magnetic body is laid out loosely underneath the mine so that when the mine is raised from the ground this results in the mine being removed from the magnetic body, so that a change in the magnetic field which initiates detonation of the mine is sensed by the magnetic field sensing device.

Abstract: A procedure for igniting an explosive device, particularly an anti-tank influence mine acting on the full width of a vehicle, comprising a formed charge (1) and a clearing charge (3). The procedure consists in inhibiting the ignition of the clearing charge during the passage of a heavy, predominantly metallic object in contact with the ground straight over the explosive device.

Abstract: An acoustic target sensor and ranging system automatically detects military targets and provides a munition firing signal at the appropriate target position and time. An amplitude-doppler circuit is utilized to predict the time of closest approach to a munition by a target by measuring the time interval between zero crossings of the second and third derivatives of the received acoustic wave amplitude function. The circuit produces a firing signal by logically ANDing the closest point of approach signal it develops with a signal that indicates when target range is within specified limits. The circuit is realized by means of conventional electronic zero crossing detectors, an up-down counter, dividers, sample and hold devices and voltage comparators. The acoustic target signal is obtained from an omni-directional microphone the output of which is amplified and rectified.

Abstract: Munition actuation signals are generated by an acoustic target ranging system that predicts the time and distance of closest approach of a moving target to a munition. The predictive capability of the system is based on the rate of change of the sound level emanating from the target compared to its absolute magnitude. The system generates munition standby, arm and fire signals by differencing the received acoustic amplitude function signal and its first derivative and subsequently comparing the difference signal with various reference level signals. The reference level signals are a function of munition effective range and target conditions. Mechanization of the system is realized by simple circuitry consisting of an acoustic signal detector and processor, a differentiating operational amplifier, a programmable gain amplifier, a reference level signal source, an adder and a comparator circuit.

Abstract: A system for automatically firing or discharing a weapon, such as a mine, comprises acoustical sensors for the preliminary adjustment and firing of the weapon. An optical sensor is used in conjunction with the acoustical sensors. In a first step, prior to the first acoustical target acquisition, the target background is optically scanned to store first optical image values defining an optical image of the target background to determine a firing range and a firing horizon. Thereafter, an acoustical ranging is performed for the target acquisition. Then the optical scanning and storing is repeated with regard to a firing horizon and when a target approaches the firing horizon, to provide second optical image values which are compared with the first image values to provide, by signal differentiation, proof of the presence of a target at the firing horizon. The resulting signal is used to control the weapon.

Abstract: Apparatus is provided for monitoring vibrational activity proximate to a rce of mechanical vibration. The apparatus includes a bridge rectifier which may be positioned proximate to the source, and which provides a voltage output when the source generates a pattern of mechanical vibrations of very low g-level over a brief time interval, such pattern comprising a low g-level vibrational pulse. The apparatus also includes an amplifier coupled to the bridge rectifier for amplifying the voltage output, and further includes a device responsive to the amplified voltage output for providing notice when the source generates a low g-level vibrational pulse. A timing device which is responsive to the amplified voltage output provides a record of the time which elapses between the occurrence of a specified event, which precedes the vibrational pulse, and the occurrence of the vibrational pulse.

Abstract: An antipersonnel mine is shown, a plurality of such mines being adapted to be loaded into a round of ammunition for dispersal and subsequent detonation at random instants. The timing for detonation of each mine is determined by the discharge of a capacitor, starting when dispersal occurs. The condition of the explosive lead of each mine before loading is indicated by a position indicator in the safing and arming mechanism.

Abstract: A digital circuit for sensing peaks exceeding a predetermined threshold in nalog signals employs clock and control oscillators arranged such that their frequencies vary in opposite senses in response to changes in the sensed signal. The clock oscillator frequency is counted during sample intervals of durations which vary inversely with the control oscillator frequency. A count increase (or decrease) of predetermined amount from one sample interval to the next, followed by a count decrease (or increase) from another sample interval to the next, results in an output signal. In a preferred embodiment, the clock frequency is counted in an up/down counter which, for each sample interval, is counted up and down for equal numbers of control oscillator cycles. The net count at the end of a sample interval is therefore an indication of the magnitude and polarity of changes in the sensed signal.

Abstract: In a system for the transmission of ground vibrations to an ignition device, a frequency filter and a timing circuit are disposed between the sensor and the ignition device. The timing circuit permits the feeding of the output signal of the frequency filter to the ignition device only after the mechanical vibrations producing the output signal of the frequency filter have acted on the sensor for a predetermined, variable period of time.

Abstract: A control device for activating or inactivating a pneumatic war mine, comprising one control signal receiving circuit, one circuit actuating an electromagnetic relay and one self-contained supply source. This power source is assembled in such a manner that it does not absorb any energy without the control signal and that it does not require any maintenance.