Abstract: A target detection device of the electromagnetic transmitter-receiver reaction type comprising a radio frequency oscillator which is integral with its radiating system and detector. It incorporates a pulse modulator which drives the oscillator to periods of high power transmission and a signal processing system to reject unwanted data and to effect detonation of the warhead at the optimum point on its trajectory.

Abstract: Radar signature simulator for use in electronic warfare and training intercept operators. Recorded video portions of radar signature as they appear at the point of intercept on a video tape recorder are played back to produce video signals. These signals are used to amplitude modululate an RF signal of the desired frequency. The modulated signal is amplified in a linear amplifier and fed to a broadband tansmitting antenna.

Abstract: A nonlinear technique for high-resolution data processing produces high-rlution power spectra from the output of a conventional processor. First, a "guess" of the spectral estimate is formed. Then the spectral estimate is convolved with the system response function to produce estimated output levels. The differences between the estimated output levels and the measured output levels are used to modify the spectral estimate to produce a new "guess". This process is repeated until certain criteria are satisfied.

Abstract: A broadband matching network for a Helmholtz resonator transducer is a series RL matching network capable of withstanding a high power level. The usable acoustic broadwidth is expanded to produce a symmetrical output over a broad frequency band.

Abstract: A conductivity anomaly detection system uses a rotating superconducting met to generate a known source field and an integrated detection system rotating with the superconducting magnet to detect anomalies in the generated source field caused by nearby conducting targets. The superconducting magnet is rigidly mounted in a Dewar which is in turn mounted on a shaft. An orthogonal detection system also is rigidly mounted on or within the Dewar with the superconducting magnet. The second harmonic of the anomaly signal from a target is detected for signal processing.

Abstract: A locking bolt system for locking shipboard water tight doors, hatches and cuttles comprising plural bolts with racks thereon driven by pinions rotated by a drive shaft. Rotation of the drive shaft is controlled by a contoured locking disk which is locked and unlocked by two lugs each operated by an independent lock cylinder.

Abstract: A circuit for generating a noise signal for use in a jet engine noise simtor which utilizes two component pseudo-random noise (PSN) generators and a combination field effect transistor (FET) and resistor circuit to which the outputs of the PSN generators are connected such that the signal from one PSN generator is modulated by the signal from the other PSN generator.

Abstract: A satellite method for measuring sea surface temperature uses simultaneous overage by two satellites in the same spectral window plus a simplified atmospheric radiative transfer model. A geostationary satellite and any polar orbiting satellite provide nearly coincident infrared imagery of a given area with points of equal and unequal observation angles. The calibration curve of the data for one satellite is adjusted to match the temperatures of the better calibrated satellite data along the equal angle points. A difference image is obtained from the resulting two satellite temperature images. The difference image together with the two observation angles and the temperature of the more accurate satellite radiometer are input to a suitable atmospheric model to obtain sea surface temperature at each point in the study area. The result is an accurate sea surface temperature for each point within a given area which is corrected for a spatially variant atmosphere.

Abstract: An interferometer for measuring optical surfaces which is capable of very high sensitivity. A HeNe laser light is converted into a circular polarized beam, spatially filtered and collimated. The light beam is passed through a photoelastic modulator for modulating the relative phase of the two polarization states of the optical field of the beam. The beam is then passed through a ROCHON prism which splits the beam into two orthogonally polarized components. One beam is reflected off the optical surface that is being measured and is recombined with the undeviated beam. The resulting irradiance distribution oscillates in the modulation frequency and the phase of the oscillation is dependent upon the optical path difference between the two beams. The detected interference signal is processed to extract the phase information.

Abstract: A coherent radar system for using the effects of doppler shift on the disbuted spectrum of a pulse modulated carrier to produce a harmonic relationship between doppler side bands at the frequency of the transmitted pulse repetition frequency. Correlation between adjacent side bands are used to generate a second order doppler signal which has a wavelength equal to the pulse repetition frequency instead of the carrier frequency.

Abstract: A passive target detecting system for discriminating against both doppler d continuous wave off-target radars. A signal from the missile guidance system representing the pulse repetition frequency of the target being tracked is combined in a coincidence circuit with the signals received by the target detecting device. Doppler signals are compared directly while CW signals are processed through a chopper amplifier circuit to simulate doppler signals before comparison.

Abstract: A passive target detecting system for discriminating against off-target rrs. A signal from the missile guidance representing the pulse repetition frequency of the target being tracked is combined in a coincidence circuit with the signals received by the target detecting device.

Abstract: A target locating and missile guidance system comprising reconnaissance araft equipped with laser or radar range-measuring apparatus in conjunction with a plurality of selectively predetermined ground stations. Range and altitude of the aircraft relative to a detected surface target are obtained at two or more points on its flight path. The positions of the aircraft with respect to the ground stations are simultaneously determined by pulse-time-of-arrival technique. Using triangulation techniques the location of the target is determined with respect to a pulse grid coordinate system associated with the ground stations. At any time after the determination of the location of the target, properly timed signals from the ground stations or command signals based upon time-of-arrival data with respect to pulses from the missile are used to provide accurate guidance of the missile to the target.

Abstract: An apparatus for providing increased homing capabilities in a guided miss seeker against a continuous wave radar signal by compressing the received signal which effectively increases the received signal level by more than twenty decibels.

Abstract: A system for battlefield and enemy support area surveillance. An air-drop unit monitors and records on tape enemy activity, and plays back and transmits the monitored data at high speed when interrogated by a coded signal from friendly aircraft.

Abstract: 1. In a microwave proximity fuze that can be activated within a few millionds prior to intercept of a target, the combination comprising:(a) a semiconductor frequency modulated microwave generator including a transistor power amplifier,(b) a power supply for supplying B+ voltage to said power amplifier,(c) a silicon controlled rectifier switch connected in series between said power supply and said power amplifier and having its control electrode connected to a terminal adapted to be connected to a control arming signal source,(d) bias circuit means connected to said rectifier switch for maintaining a bias voltage sufficient to keep said switch in a non-conducting condition until an arming signal with sufficient voltage to overcome said bias voltage is applied to said switch.

Abstract: 1. A system for detecting the presence and position of submerged objects below the ocean surface, comprising in combination, means for projecting a beam of electro-magnetic rays falling within the 0.4800 to 0.5800 micron wave band in the direction of an object to be detected, a receiver for receiving rays reflected from an object in the path of said projected beam, said receiver comprising a spherically shaped body having an aperture formed in the area which is in contact with the ocean water to permit said reflected rays to enter and impinge on the inner surface of said spherically shaped body, inlet and outlet means for circulating dry cooled constant temperature nitrogen in said spherically shaped body under sufficient pressure to prevent ocean water from entering said spherically shaped body, and a plurality of lead sulfide cells mounted on the inner surface of said sphere for generating an output signal proportional to the intensity and angle of entry of the reflected rays.

Abstract: A method for determining antenna near-fields from measurements on a spherical surface. Phase and intensity values are measured by scanning a probe antenna over a spherical surface. The method applies both to planar or conformal antennas. The spherical surface may be in the Fresnel or Fraunhofer regions. The field at the antenna is computed utilizing the complex conjugate of the measured field. As a result, the source antenna at the point at which the antenna radiating field is evaluated is inside the measurement surface. Far-field patterns can be computed from the near-fields reconstructed from the spherical hologram surface.

Abstract: A low profile transmitting antenna consisting of a circular slot in a coal cavity that is folded several times. The last inner fold of the coaxial cavity is loaded with the tuning coil. The tuning coil can in the alternative be connected in series with the transmitter leeds connected to the radiating slot. Concentric cylinders alternately attached to the top and bottom of the cavity are used to form the folded coaxial cavity that provides the equivalent of a tapered transmission line. Energy to be transmitted is fed across the circular slot of the antenna or in the alternative may be fed into the last inner fold in the center of the cavity. The antenna radiates energy out with the same radiation pattern as a vertical monopole antenna.

Abstract: An InP/SiO.sub.2 insulated gate field effect transistor which exhibits power gain at microwave frequencies is manufactured by using an n-type epitaxial semiconducting InP film on a semi-insulating InP substrate and depositing a pyrolytic silicon dioxide insulating film on the conducting InP film to form the gate insulator.