Abstract: An adaptive nonlinear processor in which the desired radar signal together with an interfering signal is mixing with a voltage controlled oscillator and fed to a dispersive filter, the output thereof being detected and converted into gating pulses for enabling a gate circuit that is also fed by the same dispersive filter. The gated output is frequency inverted and fed to a second dispersive filter which produces an inverse Fourier transform. The signal is then mixed with the delayed output of the voltage control oscillator and band pass filtered.

Abstract: An IF side-lobe canceller having a main channel and a pair of auxiliary channels in which the signal from the main channel is mixed with a stable local oscillator and fed to a subtractor, while in each of the pair of auxiliary channels the signal from an omnidirectional antenna is fed to a mixer and then to the subtractor. The subtractor's output is fed to mixers together with the signals from the omnidirectional antennas. The outputs of these mixers are fed to additional mixers together with the mixed outputs of the stable local oscillator and a second oscillator.

Abstract: An intermediate frequency sidelobe canceller having two cancellation points, one delayed with respect to the other. By utilizing the control signal generated by the loop associated with the undelayed cancellation point to control the cancelling signal at the delayed cancellation point, the "lock-on" time of the delayed cancellation point can be reduced to zero.

Abstract: A dual mode sensor having a seismic channel and an RF channel with a logic circuit recognizing both channels. The seismic channel detects disturbances with a geophone and determines the spacing and the density of the impulses while the RF channel radiates electromagnetic energy and detects impedance changes in the oscillator circuit driving the antenna when the target is in the field. The rates of changing impedances and their thresholds are determined.

Abstract: A missile guidance system in which a synthetic array radar antenna control system correlates the phase and doppler frequency information contained in signals received by a four quadrant antenna from an illuminated section of terrain, so as to compute the velocity components of the antenna. The velocity components are utilized, in conjunction with the earth rate supplied from a terrestrial navigation system, to maintain the azimuth null plane of the antenna in alignment with a selected target designated by means of a synthetic array map of the illuminated terrain. A missile command system controls the flight path of missile along the azimuth null plane to the target.

Abstract: A radar system for reducing the effective width of a transmitted pulse without increasing power utilizing coded phase shifting. Discrete parts of the transmitted pulse are phase shifted 180.degree. and upon return to the receiver the pulse is decoded by a sequence of delay lines and phase shifters positioned in accordance with a predetermined code rendering all the discrete parts in phase which are then summed.

Abstract: In-phase sum and difference signals and quadrature sum and difference signals from a monopulse radar system are processed to form the sum of the in-phase signals, the sum of the quadrature signals, the difference of the in-phase signals, and the difference of the quadrature signals. The processed sum signals and the processed difference signals are then combined to form complex signals one of which is advanced and the other retarded by pedetermined time. The complex signals are then divided into sequences of frequencies of identical banks of narrow band filters. The differences between the outputs of corresponding filters from each bank are smoothed by low pass filters, averaged and then divided by a constant to form a beam pointing error value.

Abstract: In-phase sum and difference signals and quadrature sum and difference signals from a monopulse radar system are processed to form the sum of the in-phase signals, the sum of the quadrature signals, the difference of the in-phase signals, and the difference of the quadrature signals. The processed sum signals and the processed difference signals are then combined to form complex signals one of which is advanced and the other retarded by predetermined time. The complex signals are then divided into sequences of frequencies by identical banks of narrow band filters. The differences between the outputs of corresponding filters from each bank are averaged and then divided by a constant to form a beam pointing error value.

Abstract: A jet engine is controlled by placing time variant total pressure probes at the entry plane and the discharge plane of a jet engine fan. The pressure values at the probes are converted into electrical signals, filtered, and then fed to meters where the root-mean-square (RMS) values of the electrical signals are determined. The RMS values are fed to a computer which computes the ratio of the two RMS values and this ratio is fed to a comparison circuit which generates a difference signal representing the difference between the RMS ratio and a predetermined limit value. If the RMS ratio equals the limit value, then the operating point of a fan is altered by either changing the nozzle area, changing the fan speed, or changing the altitude or Mach number.

Abstract: A crossover circuit for propagating magnetic domain bubbles in different directions under the drive of an in-plane rotating magnetic field. The crossover circuit includes intersecting vertical and horizontal elements and a pair of L combinations each having a vertical element and a horizontal element. The L combinations are linked to the intersection by a pair of inclined elements. There is also a short horizontal element and a short vertical element linked to the intersection by a second pair of inclined elements.

Abstract: An acoustic surface wave bubble switch in which a magnetic bubble domain traveling in a thin film magnetic platelet can be guided in alternate directions by application of an acoustic wave. An array of longitudinal magnetic elements in the form of single bars and bars combined to form a T configuration together with a rotating in-plane magnetic field causes the magnetic bubble to propagate across the magnetic platelet. One of the configurations of the magnetic element is a T with a second horizontal bar and the bubble will have equal attraction for either of the horizontal bars. At the proper time an acoustic wave can direct the bubble to propagate in the direction of a chosen horizontal bar thereby effecting a switching action.

Abstract: A multiplying system for complex numbers using four three-stage 4 .times. 4 bit 2's complement multipliers and a modified adder and subtractor. Two of the 2's complement multipliers are fed to the subtractor which produces a 9 bit output representing the real term of the complex product and the other 2's complement multipliers are fed to the adder which produces a 9 bit output representing the imaginary term of the complex product. Each of the 3-stage 2's complement multipliers are modified from prior art multipliers to effect the two most significant bits. The unique adder and subtractor as well as the multipliers are implemented with universal logic gates consisting of cascode circuit components resulting in five gating stages for the complex multiplying system.

Abstract: A first laser beam is reflected from the front and rear surfaces of a partially silvered glass slab generating a diverging set of interference fringes which are collimated by a positive lens. A second set of fringes is generated by a second laser beam and second partially silvered glass slab and is positioned to project through the first slab and is collimated by the same positive lens. The second pattern is aligned coaxially and mutually perpendicular to the first pattern creating a rectangular parallopiped grid pattern projected upon an observed object.

Abstract: A system for digitizing and interfacing analog data from a plurality of amplitude modulated periodic signals with a computer in which an alternating reference signal is identified and sampled input data to be digitized is synchronized at the same time reference point of the waveform of the reference signal. Pulses from a real time clock are counted and synchronized with the reference signal and this synchronized signal is delayed and fed to a timing circuit which starts the multiplexing of the input signals and also activates an address counter to initialize the address locations in the computer. The analog data from the multiplexer is converted to digital values by an analog-to-digital converter and fed to the computer at the given address.

Abstract: A shift register generator feedback tap identification system in which a received code is fed to a register which detects when the code contains all 1's at which time a bit position counter and a variable tap shift register generator are reset and a null-filter is enabled. The bit position counter controls the tap positions of the variable tap shift register generator and the output thereof is fed to the null-filter which compares the received code with the code from the variable tap shift register generator.

Abstract: A camera shutter tester that automatically displays a standard shutter speed nearest to the actual speed of the shutter being tested and displays a ratio of that speed to the standard speed. A photodetector is placed in the focal plane of the camera that faces a light source and the photodetector's output is threshold detected and a logic circuit generates an initialization pulse. A voltage controlled oscillator dependent upon the photodetector's output feeds a countdown shift register that is in turn fed by a range shift register which also feeds range information to a ratio counter. The initialization pulse activates the range shift register, the countdown register, and the ratio counter. The frequency of the voltage controlled oscillator is divided by the output of the countdown shift register and the new frequency is fed to the ratio counter which in turn delivers a range change pulse to the range shift register.

Abstract: The D(log E) curve of an unknown film is obtained by first measuring a first film having a known D(log E) curve and of the same type as the unknown film. Measured are the densities of a plurality of objects and their corresponding distances for which the object densities decay to film base densities. These values are plotted and with the known D(log E) curve, an x(log E) curve is obtained which is valid for all films of this type. The unknown film is measured to obtain values of object densities and corresponding decay distances and a curve of the values is obtained, and when used with the x(log E) curve for the film type, a new D(log E) curve is obtained for the unknown film.

Abstract: A magnetic domain memory system using single in-plane alternating magnetic fields augmented by surface elastic waves. Acoustic waveguides having bars of Permalloy elements interleaved on opposite sides of the waveguides are pulsed by surface acoustic waves generated by acoustic transducers at the ends of the waveguides. The alternating fields can be either perpendicular or parallel to the propagation direction of the magnetic domain bubbles and the interleaved Permalloy elements are positioned accordingly. Using a single alternating magnetic field, a pair of acoustic waveguides with associated surface wave transducers are configurated in loops and aligned with one having the bubble propagation direction parallel and the other perpendicular to the alternating magnetic field. Current activated transfer gates are interposed between adjacent points of the two acoustic waveguides.

Abstract: Hybrid digital processor of a missile guidance system in which the input spectrum is mixed, limited, sampled, and fed to a recirculating shift register. Sampled values of the shift register, with the same oscillator controlling the sampling rate of the limiter and the shift register, are mixed with a signal from a voltage controlled oscillator and fed to a threshold pulse generator which is connected to a sampling logic circuit that feeds a series of counters.

Abstract: An alarm intrusion system using existing power lines. A sweeping oscillator controlled by a second oscillator having a lower frequency is connected to the power line through a transient clipper and a power line isolator. Connected to the sweeping oscillator and transient clipper is a bandpass filter and automatic gain control circuit, the output of which is evelope detected and fed to a bandpass filter and then to a slope amplifier or differentiator. Positive and negative level detectors responsive to changes of envelope slope are fed to a latching flip-flop via an OR gate. Also fed to the latching flip-flop is a reset pulse derived from shaping the output of the second oscillator. This pulse is also fed to an up/down counter, the direction of the count being determined by the latching flip-flop output. The count is decoded and fed to alarm circuits. The power line is connected to an inductor-capacitor circuit having a predetermined resonant frequency that is altered upon the closing of an intrusion switch.