Abstract: A digital technique is disclosed for filtering clutter in a pulse doppler I radar which allows a filter notch to be set for different doppler frequencies. In particular, the system includes two or more MTI filters cascaded to cancel different kinds of clutter signals that interfere with target signal reception. In each filter a digital detection circuit senses the mean-clutter-doppler frequency for a particular clutter type and automatically places a notch at that frequency. Each notch is fixed by treating the radar samples as complex numbers and replacing the conventional filter coefficients with complex coefficients indicating amplitude and phase as derived from the radar returns.

Abstract: 1. A system for detecting the movement of a remote object comprising trantting means for illuminating said remote object with a signal of wave energy, receiving means for recovering an echo reflected by said object, signal display means responsive to said echo to provide a separate visual display of each cycle of said reflected echo, and frequency comparing means responsive to a difference in frequency between the wave energy of said received echo and the wave energy of said transmitted signal to vary the orientation of said visual indication from a reference orientation, whereby a variation in said orientation will provide an instantaneous indication of a doppler effect on said transmitted wave energy.

Abstract: An olefinic polymerization initiator comprising a micellar complex of a mll-forming detergent selected from the class consisting of C.sub.10 to C.sub.18 aliphatic-trimethylammonium bromide, C.sub.10 to C.sub.18 aliphatic-trimethylammonium chloride, hexadecyl pyridinium bromide, and hexadecylpyridinium chloride, and a bisulfite in a detergent-to-bisulfite mole ratio from 1:2 to 50:1.

Abstract: An improved optical storage device capable of storing optical images in a charge pattern in a high-resistivity piezoelectric semiconductor layer on a semiconductor substrate. A semiconductor substrate, coated with a layer of electrically insulating material, has a layer of high-resistivity piezoelectric semiconductor covering the insulating layer and covered by a semitransparent biasing electrode. When a negative bias is applied to the electrode, and an optical pattern applied through the electrode, slow states are charged in a short interval to store, for long periods, a pattern imaged by the light. The optical pattern can then be read by using acoustic surface wave imaging techniques to provide electrical imaging of the stored optical pattern.

Abstract: A light-weight, night vision system which combines a reflected-light, imag device with an audio-monitored, far infrared detection device (HANSAM) for detecting long wavelength infrared radiation from warm bodies. The imaging device may be a near-infrared image converter or a visible image intensifier such as a "starlight scope". The Hansam is attached to the imager so that the center of its field of view coincides with the center of the field of view of the imager.

Abstract: A method for preparing a mixture of decaborane-14 and an alkyl-substituted ecaborane-14 which comprises admixing an ethereal solution of nonaborane-14 ions with an alkaliboron halide at a temperature from 20.degree. C to 30.degree. C and at pressure from atmospheric pressure to 400 psig and a method of preparing decaborane-14 which comprises preparing an ethereal solution of nonaborane-14 by a reaction in an ethereal solution of an alkali metal borohydride with an excess of pentaborane-9 at temperature from 20.degree. C to 30.degree. C and admixing this ethereal solution of nonaborane-14 ions with diborane-6 at a temperature from 20.degree. C to 30.degree. C and at a pressure of at least 50 psig. Such compounds are useful as precursor compounds for the synthesis of important carborane derivatives, such as n-hexylcarborane (a catalyst for rocket propellants) and high-temperature-resistant carborane/siloxane polymers.

Abstract: Tantalum phosphinates of the general formula: [Ta(OPRR'O).sub.p (Z).sub.5b.-p ].sub.n wherein 1.ltoreq.p.ltoreq.3; R and R' are aryl groups; Z may be a halo, alkoxy, or aryloxy group or a mixture thereof; and n may be any number. The preparation thereof is based on the reaction of a tantalum pentavalent compound (TaZ.sub.5) with a phosphinic acid (RR'P(O)OH) in a dry inert solvent at reflux temperature. Such compounds are useful in high temperature laminates as fillers. Oxide hydrates of these compounds may be prepared by hydrolysis and are similarly useful in high temperature laminates as fillers.

Abstract: A microwave-integrated-circuit amplifier provides a broadband response in e region of 1-10 GHz. The amplifier includes: a microstrip which provides distributed circuit values for tuning; first and second microwave FETs included in the microstrip and tuned to the upper and lower cutoffs of the bandwidth, respectively; and a non-reciprocal microwave isolator which passes a signal in only one direction and is connected between the first and second microwave FETs.

Abstract: A doppler-radar system for computing terrain clearance of the projected flight path of an aircraft from a maximum-range doppler frequency and a doppler frequency for a known slant range. The apparatus includes a transmitter/receiver, a maximum-range doppler-frequency counter, a slant-range doppler-frequency counter, and a terrain-clearance computer which receives the outputs of the maximum-range and slant-range doppler-frequency counters to compute a depression angle and terrain clearance and provide an output of the terrain clearance to an indicator.

Abstract: A warning is provided when a responding IFF target fails to satisfy friencceptance criteria in response to a given number of cryptographic interrogations. Target position information is utilized to aid in determining whether the responses under evaluation come from the same target.

Abstract: An interferometer which retains the lateral vibration rejection capability of a three-beam interferometer and maintains a large work space between the beams while improving longitudinal vibration noise rejection. The system makes use of beam splitting assemblies which split the source laser beam into three beams and then recombine the beams. The recombination assembly includes wedges which introduce a small angle between the outer beams so that a small number of fringes are formed across the diameter of the beam.

Abstract: 1. A broadband microwave absorber comprising a sheet of magnetic ceramic material having the general formula, MOFe.sub.2 O.sub.3, in which Fe.sub.2 O.sub.

Abstract: A tool for nondestructive testing of wire rope. Wire rope is held in posin in a frame by two grips such as gripper pliers. One grip is rotated relative to the other thereby reverse-twisting and opening the rope strands. Visual observation will reveal any damaged strand wires. The device is provided with mechanical stops to prevent over-twisting which may damage the wire rope.

Abstract: A probabilistic decision making device produces an "Accept" decision when a predetermined ratio of input 1's to 0's is established for a predetermined total amount of binary information. The decision making process in essence is an implementation of probability theory relating to a classical "Urn" problem. The device forms a standard reference decision device for similar types of decision making apparatus.

Abstract: Derivatives of perbromic acid of the formula: XBrO.sub.4 wherein X is Ag, H.sub.3).sub.2 CH, or (CH.sub.3).sub.2 C.sub.2 H.sub.3 prepared by a synthesis of silver perbromate through the reaction of dilute aqueous perbromic acid with silver oxide at a temperature from 0.degree. to 50.degree. C, followed by a removal of water and by a synthesis of isopropyl or isobutyl perbromate through the reaction of anhydrous silver perbromate suspended in a fluid selected from the class consisting of carbon tetrachloride, cyclohexane, and 1,1,2-trichlorotrifluoroethane with an alkyl bromide at a temperature from -25.degree. to 0.degree. C. Isopropyl and isobutyl perbromates are useful as oxidizing agents for alcohols.

Abstract: A small, light weight, stemless valve for accurately metering constant-voe rates of gas flow. The valve is provided with a filter which protects a small interchangeable orifice from particulate matter, and the housing parts are rotatable relative to each other for controlling gaseous flow through the valve and for preventing flow through the valve.

Abstract: A digital scaler adjusts the processing of an input signal to a digital fback integrator by a multiplying technique which is implemented by shifting the connections between an analog-to-digital converter and the input to an adder, both forming the input section of a digital feedback integrator, in order to maintain a constant dynamic range of the output signal.

Abstract: A Friend-Accept decision is made based upon the accumulated value of only a imited number of responses to interrogations. A correct reply causes the accumulated value to increase by a weighted value U.sub.a, while other than a correct response causes the accumulated value to decrease by a weighted value D.sub.b. A decision to accept as a "friend" occurs when the accumulated value reaches or exceeds a predetermined threshold T.sub.a.

Abstract: A system for optically coupling an intense photon output from an explosively shock-heated gas to a laser amplifier for the generation of a very high power optical pulse. A laser amplifier element preferably a dye laser type is centrally located within and supported by an enclosed hexahedron housing filled with a visible or infrared absorbing solution. Each leg of the hexahedron has secured thereto a pyramidal shaped (a pyramid with the apex end cut off parallel with the base) gas filled lamp for pumping the laser amplifier element. Each gas lamp is provided with a liner of explosive material along the inside of the outermost surface which is ignited by an electrical detonator. Detonation of the explosive liner produces an imploding shock wave which raises the argon gas to incandescence to excite the liquid dye laser amplifier to produce a population inversion necessary for laser amplification.

Abstract: A multi-electrode grid for aligning polarized particles such as asbestos hin a dielectric medium.