Abstract: An antenna system utilizing the multibeam advantages of the Butler matrix achieve beam steering with the additional capability of placing nulls in the direction of undesired radiation. The system comprises essentially a Butler matrix with an adaptive circuit interposed between each of the antenna elements and a corresponding one of the hybrid matrices of the Butler matrix. Switch means are also provided for separating the transmit and receive functions.

Abstract: An improved metal vapor laser tube is comprised of an enclosure, preferably n an elongate tubular form, containing an amount of a metallic element. The material of the enclosure is selecteed to be electrically non-conductive and also for its ability to withstand elevated temperatures of the order of 1000.degree. C. The enclosure has at least one window capable of transmitting energy at the wavelength of emission of the metallic element contained within it. Two electrodes, preferably in the form of cylinders, are disposed at opposite ends within the enclosure in coaxial alignment with the major axis of the enclosure. An extension from the major axis of the enclosure is disposed proximate to each electrode and an electrical conductor connected to each electrode is sealed within substantially the entire length of each extension. Each electrical conductor is characterized as being of a strip configuration and having a substantially elongate elliptical cross-section.

Abstract: A digital correlator which will detect a digital pattern in the presence of noise. In an n bit pseudo-noise (PN) sequence, comparison is made of the input word with m desired PN coded word patterns; a flag is raised when a pattern is detected and identified. In one embodiment all possible (six) PN code words are programmed in a ROM (Read Only Memory). The input word is compared with all six code words in a parallel sequential search mode. In another embodiment, comparison is made of a 31 bit input word with a programmed PN code word in a single parallel comparison.

Abstract: A device for implementing the arithmetic operations of addition and multication utilizing CCD concepts and MOSFET properties. First and second CCD channels convert first and second input voltages into first and second charge quantities, respectively. The first and second charge quantities are added in a third CCD channel to provide a third charge quantity linearly proportional to the sum of the first and second input voltages. The three charge quantities are sensed by three floating gate amplifiers operated in the saturation region. The outputs of the floating gate amplifiers are subsequently combined by a differential amplifier, the output of which is linearly proportional to the product of the first and second input voltages.

Abstract: A fiber optic cable connector is comprised of two ferrules, a collar member, and a connection sleeve. First and second ferrules each have an internal bore to receive the end of fiber optic cable bundles together with a suitable bonding material for securing the fiber optic cable bundles. The terminal ends of the fiber optic cable bundles are ground and polished substantially optically flat. A first ferrule has external threads on a portion at its terminal end. The collar member is internally threaded and dimensioned to engage over the external threads of the first ferrule, and has a cylindrical portion coaxially extending beyond the terminal end of the first ferrule effectively forming a cylindrical recess. A second ferrule has a cylindrical embossment dimensioned to be received within the coaxially extending portion of the collar member for aligning the two fiber optic cable bundles.

Abstract: An improved antenna feed providing control of the plane of polarization ecially useful with "scanning with compensation" radar tracking. An input transducer is coupled to first and second output transducers whereby the output transducers transmit two pencil-beam radiation patterns which are squinted by equal but opposite angles with respect to the scan axis. During reception, however, a non-reciprocal coupling means provides for separate sensing of the return signals rceived by the first and second output means and converts the signal received by the second output means so that it is in quadrature relationship with the signal received by the first output means.

Abstract: A miniature optical lens for coupling is fabricated from selected high rective index semiconductor material of uniform thickness. Refractive index gradients are generated in the semiconductor material through changes in composition developed under controlled conditions producing a desired focal length for determinable wavelengths of light energy emitted from a light source to which the miniature optical lens is coupled. The miniature optical lens thus fabricated is especially efficient for coupling light energy from light emitting diodes and junction lasers as well as in semiconductor micro-optics within the visible and the infrared wavelengths as well because the index of refraction of the lens material may be closely matched to the index of refraction of the light source, minimizing light energy transfer losses.

Abstract: A control circuit for compensating for the change in drive current in a pe-width modulated control circuit of a power supply. Cos Mos three input NOR gates are controlled by applying an analog voltage proportional to the charge in drive current to the third input. A negative feedback loop is then provided to compensate for changing temperature.

Abstract: By providing a parachute canopy with a pull down vent line having predetened elastic properties, the inflation development time of the parachute can be automatically controlled commensurate with the parachute deployment airspeed. This construction will prevent the accidental development of an excessively deformed drag surface, especially at low air speeds, that can produce wide oscillations of the parachute, causing discomfort and possibly injury to the parachutist upon landing.

Abstract: A material is selected which is capable of propagating light energy and is lso highly absorptive of light energy within a determinable wavelength region. A laser beam which includes such wavelength region in its output energy is focused on the surface of the selected material in a sufficent concentration to cause partial evaporation of its surface and relative linear movement is given effect between the laser beam focal point and the selected material in a focal plane of the laser beam. The rate of such relative linear movement is controlled to produce grooves in the surface of the selector material by absorption of laser energy, thereby defining optical waveguide guiding paths immediately beneath the grooves due to localized change of index of refraction.

Abstract: A microstrip hybrid directional coupler in which the 180.degree. phase sh is effectuated by a twisted pair of parallel conductors.

Abstract: A high speed parallel to serial digital converter includes a data shift rster, a control shift register and control circuitry. During a control cycle a control input comprising a set of control bits in parallel form is converted by the control shift register into serial form. The serialized control bits are coupled to a register load selector which responds to the control bits to appropriately signal the control circuitry so that at the end of the control cycle the converter will commence either another control cycle or a data cycle. During a data cycle an input data word comprising data bits in parallel form is converted by the data shift register into serial form. At the end of a data cycle timing circuitry signals the control circuitry to commence a reset cycle during which the converter is reset to commence another control cycle.

Abstract: A television tracking symbol generator for use in a non-imaging seeker to ovide basic flight test performance that can be instantly understood by watching a conventional television real time display of the airborne TV monitor or subsequent display by means of a video tape recording made during the test. The display contains the dynamic and pictorial rendition of the target movement, the terrain, the weather conditions, the seeker's aim point, the stabilized platform's aim point and the target's signal strength as received at the seeker. All the key performance data about the seeker are integrated and correlated in the TV picture.

Abstract: A wholly digital system for computing the discrete Fourier transform of sequentially received data in a recursive fashion. Two parallel shift registers store and shift the real and imaginary components of the complex number X.sub.k + iY.sub.k. The data in the parallel registers are successively shifted one bit per strobe in response to receipt of new data. Additional logic operates recursively on successive data inputs to compute the discrete Fourier transform.

Abstract: A stimulated Raman scattering resonator which generates stimulated Raman ttering within an optical resonator and provides regeneration and unidirectional emission of radiation. A focusing mirror is provided for the pumping radiation and is combined with the stimulated Raman scattering resonator within a single optical structure. A semi-confocal type resonator having one totally reflecting plain mirror and one partially reflecting spherical mirror is employed to increase pumping irradiance.

Abstract: A transmitter for extending the operational range capability of laser comications and ranging systems. A narrow laser beam is angle deflected to provide a raster scan equivalent to a broad beam scan.

Abstract: A mode-launcher, waveguide antenna element providing signal transition from principal coaxial TEM-mode to a dominant TE.sub.01 -mode of a rectangular waveguide. A triangular element integrally formed with the waveguide structure and whose plane is normal to the magnetic field of the waveguide is disposed intermediate the frontwall radiating slot of the waveguide and the waveguide backwall through which the coaxial connector probe is introduced.

Abstract: A patient weighing system for automatically providing a visual display of stantaneous patient weight includes a bed assembly for receiving the patient which is supported by weight responsive means producing analog signals as a function of instantaneous total weight. The analog signals are converted to commensurate digital signals. A first storage register stores the digital signal representative of the weight of the bed assembly without the patient. A second storage register stores the digital signals representative of the total weight of the bed assembly including the patient. A difference digital signal is developed which is representative of the difference between the digital signals stored in the first and second storage registers, providing a net or remainder digital signal which is a function of patient weight.

Abstract: A serial-to-parallel data conversion and synchronization scheme in which a lurality of active logic elements are utilized as delay lines. Each of the delay lines introduces a delay equal to the period of one data bit and one additional delay line introduces a delay equal to one half the period of a data bit. The input of the first delay line is connected to the data input of a first flip-flop and the outputs of each of the plurality of delay lines are each connected to the data input of a flip-flop. The output of the additional delay line is connected to the clock inputs of each of the flip-flops whereby the serial data word is converted to a parallel data word and the conversion is internally clocked by the delay lines themselves.

Abstract: A self-clocking binary data acquisition and transfer system in which each t of any data stream is divided into four time periods such that both 0 and 1 data bits are high during the first time period and a 0 will go low after the first time period and a 1 will be low after the third time period. The first, second and third time periods are used for transmission of information and the fourth for initialization.