Abstract: A system for setting the admittances of matching base units for use with p antennas wherein the matching base unit is placed across a cavity resonator which is first calibrated in accordance with the admittances of a standard matching base unit through a range of prescribed frequencies and thereafter aligning the admittances of production model matching base units over the same range of frequencies in accordance with the previously calibrated or aligned cavity resonator.

Abstract: Interference between radar systems is eliminated by using shaped pulses. In one embodiment, the pulse has a cosine shape, in another a cos.sup.2 shape and in a third embodiment a cos.sup.n shape. In yet another embodiment, a single sideband shaped pulse is employed.

Abstract: Apparatus utilizing single sideband techniques for generating a local oscator signal of high spectral purity which is offset from a relatively wide-band signal generator frequency f.sub.g = 0.8 - 220MHz by a constant IF frequency difference f.sub.o = 46KHz. The output signal is coupled from one of a plurality of phase locked oscillators having overlapping frequency ranges which act as active filters to obtain improved spectral purity.

Abstract: A CW radar transmitter is simultaneously frequency modulated with a sinusal wave and phase-modulated with a pseudorandom binary code. Both the frequency of the FM signal and the bits and bit duration in the binary code can be varied to change the resolution and range of the system.

Abstract: Method and apparatus for determining the accurate alignment of an intense optical beam wherein the beam is passed through a preselected region of an optical transmission element which absorbs a small amount of power transmitted therethrough producing a temperature distribution which is measured by appropriately placed thermal sensors whereupon the ratio of the temperature differences between the selected regions as measured by the thermal sensors provides an accurate indication of the beam's position and any deviations from a predetermined path.

Abstract: An adaptive trunk data transmission system in which data bits to be communicated are not transmitted during certain fade durations of a multi-channel propagation characteristic, but are delayed instead, until the fade interval is over, when they are then transmitted.

Abstract: A novel microwave power divider is disclosed that is a combination of an ort junction circulator and a novel isolator-mismatch device for each circulator port other than one input port and divides microwave signal power incident to the input port into any desired ratio among the output ports and isolates all the ports from microwave power reflected back toward the divider after being propagated through the divider and thus prevents interaction among line devices, e.g. amplifier units, that are fed by the output ports. Also a novel microwave power combiner is disclosed that is a combination of an N-port junction circulator and a novel isolator-reflector device for each port other than one output port to combine at the one output port identical microwave signals or microwave signals that differ in frequency or phase incident to the isolator-reflector devices. The microwave power combiner, like the microwave power divider, provides isolation among the signal transmission lines.

Abstract: An optical device for measuring crosswinds by pattern recognition techniques is described. The device includes a minicomputer to process observed spectral profiles. In the training phase spectral features, which are weakly intercorrelated but strongly correlated with the crosswind, are selected and classified with known winds. This data is stored in the computer. During the execution phase, the observed spectral features are compared with the previously stored classifications to yield a best estimate of the crosswind.

Abstract: An interference canceling system in which a phase lock loop is utilized as narrow band tracking filter to adaptively lock to interference tones to be canceled by a process of signal subtraction.

Abstract: A wide-band ferrite limiter for operation in the microwave frequency range omprised of a plurality of intercoupled dielectric resonators having a long, thin ferrite rod passing through the longitudinal central axis of the dielectric resonant structure. Broadband operation is achieved by the proximity coupling of the dielectric resonators while the ferrite rod provides an optimized ferrite geometry which serves to increase the dynamic range and also to decrease the critical threshold field. A DC field of magnetization is additionally provided along the longitudinal central axis which with the availability of light-weight small rare earth magnets allows the limiter to be magnetized in such a fashion that a very compact device is achieved thereby.

Abstract: A broad band corrugated horn antenna with a double-ridged circular wavegu feed is disclosed in which the horn is driven by the wide band signal source having a bandwidth greater than 2:1. The bandwidth is accomplished by providing a ridge pattern with gaps therebetween in which the width of the gaps is greater than the width of the ridges.

Abstract: A microwave antenna system particularly adapted for a two channel monopulse adar tracking system having sum and difference feed networks and respective dipole antenna arrays coupled thereto wherein one of the arrays is operated as a passive reflector or director for the other array during the transmit mode but is operated together with the other array as an active receptor during the receive mode whereby sum and difference arrays are provided in order to obtain information necessary to determine angular tracking error signals.

Abstract: Hijacked vehicles, or the like, are identified by illuminating a transpon mounted to the vehicle by a beam of microwave energy, e.g., from a helicopter flying over the traffic. The transponder includes non-linear diodes which reradiate a signal back towards the helicopter. Means are disclosed for modulating the return signal with a 16-bit identification code, each bit of which is transmitted as a 31-bit pseudo-random code.

Abstract: A typical embodiment of the invention is a multiple electron beam device converting analog input signals into coded digital output signals. A beam of electrons, generated through a Watkins-Johnson laminar flow sheet beam electron gun is focused before being divided into eight individual beams by means of an eight section traveling wave time deflection system. The individual beams then are controlled by means of a traveling wave analog deflection system before they pass through an apertured target structure that corresponds to the digital code. The beams traveling through this target impact on a diode target array which then generates a coded digital output signal that corresponds to the analog input.

Abstract: A method and apparatus for retrofitting an airborne laser tracker with a er ranging capability is described. A silicon avalanche detector is mounted within the silicon quadrant receiver of a laser tracker for an aircraft. The silicon avalanche detector is mounted behind the metalized quadrant electrodes of the quadrant detector in a position which permits the avalanche detector to receive radiation passing between the quadrant electrodes. An increased instrument sensitivity is achieved which provides an increased ranging capability for the airborne laser tracker.

Abstract: A fixed format message entry device employs a solid state memory for storing data. A portable keyboard is provided to input data to a display that is packaged with the keyboard and associated electronics. The display is comprised of an array of light emitting diodes operating with fiber optics. Overlay cards have openings, through which the light emitting diodes pass. Printed codes appear on the cards, next to respective fiber optics thus facilitating the interpretation of a display, by an operator.

Abstract: The described apparatus employs the image intensifier tube assemblies of ht vision goggles for nighttime viewing, but bypasses one of these assemblies in additionally injecting pictorial or electronically generated information at a comfortable light level.

Abstract: A system for displaying target information on a realistic simulated target cene presented by a motion picture film projector. The target information is derived from laser carrying weapons which are aimed at the simulated targets. The impact point of the laser beam on the target screen are optically projected onto the target screen as spots to provide a visual presentation of the distribution of fire of the laser carrying weapons.

Abstract: A gating circuit for use with an image intensifier tube which allows the e to be turned on and off without producing residual image distortions, and when the tube is off eliminates scintillations on the image screen. The gating circuit provides for direct voltage control with the voltage across the cathode, anode, and the focusing electrodes of the image intensifier tube. The circuit includes a pair of triode vacuum tubes coupled together by a voltage divider network with an RC timing circuit controlling one tube which in turn acts as the bias and control of the other tube for turning the device on and off. The gating circuit is especially useful when utilizing an image intensifier tube in conjunction with photographic film which is time exposed to reproduce an image on the intensifier tube such that switching the tube on and off will not cause deleterious defocusing effects resulting in distortions on the photographic film.

Abstract: A quasi-optical integrated circuit which makes use of a high resistivity k single crystal intrinsic semiconductor as a low loss quasi-optical wave transmission medium for millimeter and submillimeter waves having one or more circuit elements or devices disposed either at or near the surface of a portion of the semiconductor, or formed within a portion of either the semiconductor transmission medium or a portion of a high resistivity single crystal intrinsic semiconductor appendage to said semiconductor transmission medium. By varying the potential applied to said elements or devices, one can control either the phase or the amplitude of quasi-optical wave propagation along the semiconductor waveguide; moreover, solid state devices such as quasi-optical generators, mixers and detectors can be formed within the semiconductor wave transmission medium itself.