Abstract: An integrated circuit comprising first and second read-only memories (ROM), an adder circuit and a NOR gate for determining if the content of an input data word has more zeros than ones. The invention is usable in core memories for the purpose of reducing the power requirements of the core memory. Each of the read-only memories provides a set of output data bits which are less in number than the input data word. These output bits are then applied to the adder circuit where it is determined whether the number of zeros is equal to or greater than the number of ones. The output signals from the adder circuit are applied to the NOR gate which provides a signal to the core memory instructing it to convert all zeros to ones, and all ones to zeros, thereby effecting a reduction in the power requirements of the core memory.

Abstract: A liquid bearing having general utility but beneficial use in a gyroscope comprising Peltier elements which remove heat from a holder and from the thrust and journal bearing, and a low viscosity lubricant such as n-heptane or a fluorocarbon is introduced into the evacuated gyroscope casing to fill the voids therein. The low viscosity lubricant surrounds the journal and thrust bearings. When a source of current is applied to the Peltier element, heat is removed from the journal and thrust bearings and a condensate of the low viscosity lubricant is formed on the untreated bearing surfaces, thus cooling the bearing. This heat is conducted away from the bearing surfaces via the holder, the bearing sleeve, and the Peltier elements. Grooves are formed on the bearing shaft to urge flow of the low viscosity lubricant through and around the bearing surfaces by capillary action. An alternate manner for removal of heat from the bearing surfaces, in lieu of the Peltier elements, is provided in the use of a heat pump.

Abstract: A self-contained, strapped down guidance system combining all axes, all attitude navigation having two wide angle, two-degree-of-freedom gyros which provide attitude angle and angular rate signals along three axes. Accelerometer means provide signals representative of the acceleration along three orthogonally displaced independent axes. A first transformation matrix connected to the attitude angle output of the gyros and to the accelerometers transforms the gyro and accelerometer signals from body coordinates to gyro coordinates. A second transformation matrix connected to the output of the gyros, transforms the gyro coordinates into navigation coordinates. In order to perform navigational computations, computing means compute a transformation from gyro momentum vector (referenced to coordinate frame) to a navigational coordinate frame such as a locally vertical frame wherein the Z axis is always along the local vertical direction.

Abstract: A torquer system for a gyro device that has a spherically shaped rotor divided into upper and lower hemispheres. The rotor of the gyro is mounted on a gas bearing over a spherically shaped stator and supports an optical assembly positioned parallel to the spin axis of the gyro. The torquer is positioned on the base of the gyro beneath the lower hemisphere of the rotor so as to permit the maximum angular freedom of the rotor and optical assembly. The torquer comprises four pole pieces separated 90.degree. from each other. Each torquer has two pole faces and coils located between pole faces. The coils contain separate windings for bias and control of the torquer. A current flow through the windings of the torquers causes magnetic flux lines emanating from the pole faces to pass through magnetically permeable material affixed to the lower hemisphere of the gyro rotor closing the magnetic circuit.

Abstract: A velocity sensor system comprising a receiver capable of processing the narrow pulse speckle pattern return from a transmitting source in order to determine the velocity of the vehicle in which the velocity sensor is mounted. Three channels, each one connected to a receiving horn, receive the speckle pattern return signal equal in power but separated in space due to the spatial arrangement of the horns. A first local oscillator is connected to each channel and is controlled as part of an Automatic Frequency Control (AFC) loop. A carrier frequency from the first local oscillator along with the received signal is applied to the first mixer stage to produce a first IF signal which is applied to a wide band IF amplifier. The wideband IF amplifier is designed to blank the receiver during the transmitter pulse in order to prevent overloading of the receiver or overpowering of the echo.

Abstract: A gyro seeker which may be employed and housed in the nose section of a cannon launched missile. The gyro seeker functions in a dual mode in that it detects either laser designated targets or targets emitting infrared radiation. Structurally, the gyro seeker comprises a spherically shaped gyro element hydrostatically supported on a gas bearing surface within a spherical cavity of a spherically shaped platform. The gyro in turn supports optical and detector/cryostat assemblies for tracking and detecting desired targets. The platform is similarly hydrostatically supported on gas bearings within the housing. The platform is restrained on the base of the missile by a trapeze mechanism which limits the platform to two-degrees-of-freedom. Means are provided for torquing both the gyro and the platform. Additional means are provided to allow the gyro seeker to withstand the high induced acceleration forces of cannon launching.