Abstract: An aircraft navigation system supporting a plurality of navigation modes. An error estimator for each navigation mode provides an estimated navmode error signal representative of an estimate of the error in the position signal generated by the associated navmode. A navigation mode selector enables the navmode having the smallest estimated navmode error signal that is consistent with procedure specified navaid criteria. The navmode computed position signal is processed through a low pass position filter. The estimated navmode error signal associated with the selected navmode is processed through a low pass position error filter having the same time constant as the low pass position filter to provide an estimated position error. The estimated position error is utilized in providing the INS and DEAD RECKONING navigation as well as to set a threshold for estimated navmode error signals sensor data validation.

Abstract: A low dispersion delay discarding sabot projectile comprising a full caliber cylindrical pusher having a forward facing cylindrical recess, a cylindrical subcaliber penetrator positioned in the recess with a significant annular gap defined therebetween, and a discarding sabot of light weight material disposed in said annular gap.

Abstract: A four color repetitive sequence matrix array for flat panel displays is formed by establishing a repetitive sequence with pixels of four different colors arranged in the rows of the matrix. The sequence commences with a different color in each row, thereby establishing a second repetitive sequence in the matrix columns. These row and column sequences establish a pattern of 16 pixels with sets of four rows and four columns that is repetitive throughout the array.

Abstract: An apparatus for pressure burst testing of a hollow vessel, such as a gun barrel, includes a hydraulic cylinder assembly and a test mandrel mounted on a frame in axial alignment. The test mandrel includes a hollow sleeve stationarily mounted on the frame and having an outer end adapted to receive thereover the vessel such that the portion of the vessel to be tested extends beyond the outer end. An elongated drawbar is disposed coaxially within the sleeve and is attached to a reciprocally driven piston of the cylinder assembly. At an outer end, the drawbar extends beyond the sleeve outer end and is coextensible within the vessel portion to be tested.

Abstract: A permanent magnet rotor type electrical alternator-SCR power supply having a unique series resonant LC circuit connected to the alternator and resonant close to the lowest expected frequency of the alternator.

Abstract: Link means for automatically releasing a static line from a torpedo launching aircraft.

Abstract: A method of securing a tracer cup 26 and fin segments 32, 33 to armor piercing penetrator 21. The penetrator 21 is fabricated of tungsten, or steel, with fin segments 32, 33 and tracer cup 26 being fabricated of steel. The tracer cup 26 contains a pyrotechnic tracer mix 27. The mounting flange 28 of tracer cup 26 is placed over a second boss 24 projecting rearwardly from a first boss 23 at the aft end of the cylindrical body of penetrator 21. A cylindrical sleeve 30 is press fit over the tracer cup 26 and first boss 23, and pre-fabricated fin segments 32, 33 are positioned on the sleeve 30. The fin segments 32, 33, cylindrical sleeve 30, and mounting flange 28 of tracer cup 26 are laser welded to each other and to the first boss 23 of penetrator 20 in one step.

Abstract: An inspection apparatus is arranged to respond, selectively, at the option of the operator, to either the hue component of the composite color signal, the saturation component of the composite video signal or the intensity or luminance component of the composite signal, to produce a corresponding output signal to which the signal image processor may respond to produce suitable gray-scale images for the operation of the inspection system.

Abstract: An interconnecting grid is disclosed for joining integrated circuit components. The grid has the form of a honeycomb, and is made up of a plurality of interconnected hexagonal conduits, each conduit surrounding an associated pin extended from the integrated circuit component. Each conduit surrounds its associated pin to protect the pin from mechanical damage and isolate the pin from signals emitted by neighboring pins and other extraneous noise. The grid further functions as a heat sink for the removal of heat from the integrated circuit component.

Abstract: An enabling device 24 for a gas generator 42 of a forced dispersion munitions dispenser 10 includes a housing 58 in which and formed a bore 60, an outlet lead 88 and a detonator opening 68 in which is positioned an electrically initiated detonator 70. A piston 62 is located in the bore 60 and has a disabled position and an enabled position. A safety groove 64 is formed in the outer surface of the piston 62, and a safety passage 72, a safety aperture 74, 75 and a transfer lead 86 are formed in the piston 62. A gas generator 42 containing a quantity of pyrotechnic material 84 is mounted on the housing 58. The gas generator 42 is provided with a safety outlet 46, 47 and an inlet lead 44.

Abstract: An align at fire safe and arm and electrical power supply module 10 for an electronically fuzed land mine 12. The module 10 is removably mounted into the land mine 12. Reserve batteries 16 are contained in the module 10 and are energized when a safety pin 25 is removed during mine emplacement. A slider 30 is located in the module housing 14. When the slider 30 is in its safe position, the firing train 57 of the warhead 65 of the mine 12 is interrupted. When the slider 30 is driven into its armed position by a piston actuator 32 in response to an align signal being produced by the fuzing subsystem 87 of the mine 12, the firing train 57 is completed through a transfer lead 60 located in the slider 30. The firing train detonator 44 may then be functioned by an electrical firing signal produced by the fuzing subsystem which will event the warhead 65. Detonating the firing train detonator 44 before the slider 30 is driven into its armed position, self-neutralizes the mine 12.

Abstract: A low dispersion discarding sabot projectile comprising: a full caliber cylindrically shaped pusher having a cup-like forward facing recess concentric with the external surface of said pusher, a circumferential groove for receiving a rotation ring, said groove being positioned in approximate radial register with a rear surface of said recess, and a concave recess in the rear end face of said pusher; a cylindrically shaped subcaliber projectile having: (i) a rear portion adapted to be inserted into said forward facing recess of said pusher, (ii) a main body portion projecting forward from said pusher, and (iii) a nose portion; and a discarding sabot of lightweight frangible material disposed around said main body portion, the forward portion of said sabot being spaced radially away from the external surface of said nose portion.

Abstract: A firing train function indicator 10 for a self neutralizing recoverable land mine 16. An explosive bolt 20 is used to hold a helical spring 44 in a compressed state. The upper portion 30 of the bolt 20 is attached to one end of the spring 44 and the other end 32 of the explosive bolt 20 is attached to base 38 of indicator 10. A highly visible inverted cup-shaped flag 48 is also attached to the upper portion 30 of the explosive bolt 20. The detonator 18 of the explosive bolt 20 is fired when the mine 16 self neutralizes to separate the upper portion 30 of the bolt 20 from its lower portion 32. The spring 44 is then free to expand raising the flag 48 above the self neutralized mine 16. A flag 48 so deployed, identifies the location of a self neutralized mine 16 and is a reliable indicator to recovery personnel that the mine 16 is in fact safe to approach and recover.

Abstract: An inductive device composed of a bead (10) of magnetic material, such as ferrite, has an aperture through which an electrical conductor (13) is adapted to pass and a reset winding (14) wound thereon and connected to a source of constant current. The constant reset current resets the bead of magnetic material so that the maximum volt-second absorbtion capability of the bead is available for preventing destructively high current spikes from flowing through the electrical conductor. The inductive device is advantageously used in the d.c. supply of the power transistors (101 and 102) of an inverter (100) to protect the transistors from current surges due to the simultaneous conduction of the transistors.

Abstract: In cased telescoped ammunition the improvement which comprises an arrangement for securing the cartridge casing to the end caps so as to enable and limit axial movement therebetween.

Abstract: A proximity sensor comprising a thermal detector responding to the rate of change of a thermal input and connected to circuitry for performing a control function when the detector output becomes zero, which occurs when a target being approached by the detector fills the field of view of the detector.

Abstract: A single electromagnetic structure comprising a pair of assembled oppositely positioned pot cores, first and second winding means around each of the pedestals of the cores, and a flat magnetically permeable washer-like member positioned between the windings and spaced from the pedestals and the outer annular rim portions of the pot cores to define a pair of air gaps, whereby the apparatus functions like a transformer and an inductor in series with a winding of the transformer.

Abstract: An inverter for producing A.C. from a source of D.C. electric power. The power circuit includes a power transformer with the current flow through the two halves of the primary winding 16 being controlled by a pair of power MOSFETs. A gate driver circuit which includes a driver transformer produces control signals which are substantially 180.degree. out of phase across the center tapped secondary winding of the driver transformer. A pair of fast-off, slow-on coupling circuits consisting of a diode connected in parallel with a resistor couples gate control signals to the gates of the power MOSFETs. Each coupling circuit is effectively in series with one of a pair of current limiting off-time setting resistors, the latter being connected in series with the two halves of the primary winding of the gate driver circuit control transformer.