Abstract: Actuating circuitry which may be used with a contact exploder, useful on a orpedo, for example, which is sensitive not only to direct hits but also to abrasive damage or sea water exposure caused by grazing contact, but insensitive to changes in its velocity or momentum or unwanted environmental background, such as shock, vibration and electromagnetic field variation. The exploder includes a normally insulated and shielded wire which traverses that part of the surface of the missile which is most likely to make contact with a target. The wire is so connected into associated actuating circuitry that it will cause explosion if: (1) even grazing contact with a target causes removal of even a small amount of the insulation and shielding of the wire, which causes grounding of the circuitry at the wire; or (2) even grazing contact opens or breaks the wire at any point.

Abstract: An automatic control system is disclosed herewith which causes the notch ter incorporated in a sonar system or any other appropriate utilization apparatus to be electrically by-passed in response to a predetermined minimum doppler present within a data signal being filtered thereby. It includes such uniquely combined elements as envelope detectors, rate-of-decay and rate-of-rise amplifiers, bistable multivibrators, an inverter, and an AND gate for adjusting the position of a selector switch connected for alternately electrically by-passing the notch filter. In addition, the gain of a variable gain amplifier disposed within an automatic gain control loop that includes the aforesaid elements and notch filter may be optionally employed to regulate the gain of the data signal supplied to said notch filter in correspondence with the by-passed and non-by-passed conditions thereof.

Abstract: 6.

Abstract: In a detection system for torpedoes providing a first output signal depent upon target direction relative to the torpedo wherein the target is swept at least initially the combination comprising: movable means actuated by said first output signal for providing an output function proportional to target angle from a reference and to signal-to-noise ratio and having a predetermined power spectrum during the time the target is being swept; first means actuated by said movable means for producing a varying electric signal proportional to said output function; fiter means for receiving said varying electric signal and having a fixed high pass for passing substantially only those frequencies within said power spectrum thereby to filter substantially all undesirable noise signals and amplifier means connected to said filter means for receiving the output thereof, and amplitude detector means connected to the output of said amplifier means to gate upon the reception of a pre-determined level of signal.