Abstract: The signal appearing at the receiver input of a pulse code active sonar dng a return echo period, is sampled, time compressed and stored in a memory. The time compressed sample is successive read-out of memory, with each individual "read-out" hetrodyned with a discretely different doppler compensation frequency signal. The successively processed read-outs are passed through an "on line" correlation detection device to determine presence of a correctly compensated pulse code echo.

Abstract: A data analysis system accepts time related data samples which are develo from sets of common wavefronts incident upon a plurality of sensors. The data samples are converted from analog-to-digital form and the Fourier transforms relative to the frequency components are generated. The frequency components of the Fourier transforms are in turn cross-correlated for developing matrices of all possible correlations for each frequency component and then the matrices are integrated over a determinable time period. The resultant integrated matrices are compared with signals representative of an incident plane wave power as a function of its angles of arrival at a sensor array and of its frequency, producing output signals of relative strength indicative of the direction of the origin of the data samples.

Abstract: A data link for an automatic aircraft carrier landing system is described which an aircraft is guided to the carrier by pitch and bank information from the carrier so as to indicate to the pilot of the aircraft whether he is within a prescribed flight path for landing or whether he should be waved off for another approach. The information transmitted from the carrier is received by a microelectronic data link receiver having an internal clock which is synchronized with the incoming information to determine if that particular aircraft is being addressed and if so, what the nature of this information is so that it may be stored and presented to the pilot at a later time for appropriate action.

Abstract: A data link for an automatic aircraft carrier landing system is described which an aircraft is guided to the carrier by pitch and bank information from the carrier so as to indicate to the pilot of the aircraft whether he is within a prescribed flight path for landing or whether he should be waved off for another approach. The information transmitted from the carrier is received by a microelectronic data link receiver having an internal clock which is synchronized with the incoming information to determine if that particular aircraft is being addressed and if so, what the nature of this information is so that it may be stored and presented to the pilot at a later time for appropriate action.

Abstract: A data link for an automatic aircraft carrier landing system is described which an aircraft is guided to the carrier by pitch and bank information from the carrier so as to indicate to the pilot of the aircraft whether he is within a prescribed flight path for landing or whether he should be waved off for another approach. The information transmitted from the carrier is received by a microelectronic data link receiver having an internal clock which is synchronized with the incoming information to determine if that particular aircraft is being addressed and if so, what the nature of this information is so that it may be stored and presented to the pilot at a later time for appropriate action.

Abstract: An improvement for a fiber interferometer gyro provides for greater rotation rate sensitivity. The gyro has a single mode fiber coiled about an identical area a great number of times. A single external laser sends pulses of energy which are split and passed in opposite directions through the coiled fiber and a pair of optical amplifiers inserted to amplify the energy pulses. This permits the length of the coiled fiber to be increased and, hence, provides for greater interferometer sensitivity.

Abstract: 1. An interference proof FM video communication system comprising:means for frequency modulating a carrier frequency by a video signal;means for bi-phase modulating the output of said frequency modulating means n accordance with a binary code, said phases being 180.degree.

Abstract: A method is provided for mass production of a monolithic light emitting semiconductor display utilizing light emitting semiconductor devices formed in a monocrystalline silicon wafer and a covering of silicon dioxide formed into lens structures for controlling the light emitted by the semiconductor devices.

Abstract: 1. A masking-jamming sonar countermeasure system comprising in combination, receiver, a transmitter, a sequence timer connected between said receiver and said transmitter for regulating the operative time intervals thereof, and means coupled to the input of said transmitter for driving same with predetermined sonar signals and psuedo noise signals alternately applied thereto on a time-shared basis.

Abstract: A planar millimeter wave microstrip triplexer for separating three contigs bands of frequencies (lower, middle and upper bands). The middle band is separated by the use of a diplexer comprising two quadrature couplers connected by dual identical planar bandpass filter sections. A second diplexer comprised of two edge-coupled filter sections is connected to the isolated port of the input quadrature coupler of the first diplexer. Signal components contained in the upper and lower frequency bands appear at the respective outputs of the second diplexer.

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 wideband VHF antenna operable simultaneously on multiple frequencies hag an instantaneous bandwidth greater than one octave and having a total length less than one-quarter wavelength at the lowest operating frequency. A wideband impedance transformer is connected to the antenna total radiating structure at the feed point. The radiating structure comprises a conductor secured to a dielectric whip. The conductor is comprised of two sections of length L1 connected by a short length of electrical connector to form a large loop. The radiating structure further comprises a second electrical conductor of length L2 connected by another short length of electrical connector so as to form a small loop. The length L2 conductor is disposed in the neutral plane between the two conductor sections of length L1.

Abstract: An apparatus and method is provided for adhesive bonding together of fiber ptic elements, i.e. fibers, utilizing a light source and an adhesive that will be cured by said light source, the adhesive being irradiated by the light and cured around the entire connection at the same time to provide a uniformly stressed bonded connection.

Abstract: 1. In combination in a free, underwater craft, a hull, means for carrying llast, means for discharging said ballast, depth responsive means, a timer providing two time intervals, control means operated by said timer for actuating said discharging means after a pre-set time interval, and other control means operated by both said timer and said depth reponsive means for actuating said discharge means after a shorter time interval if said craft attains a pre-set depth.

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: 1. In combination in electronic apparatus for simulating the self-noise of submarine, means for generating a wide-band noise signal, means for modulating the noise signal at a frequency corresponding to the propeller speed of a submarine, means for generating a signal at the frequency of the tooth impacts of the main drive gear of a submarine, and amplifying and output means for both said tones.

Abstract: An operator console, a general purpose digital computer and a radio set irface are connected to perform the modulation and demodulation of the differential coherent quadrature phase shift signal used to transmit the digital information over a computer-to-computer radio link. The console is used to initiate communications and to control and monitor link operation. The computer performs all of the signal processing and control functions. The radio set interface performs analogue-to-digital (A/D) and digital-to-analogue (D/A) conversions for the received and transmitted signals, respectively. The programmable data terminal set (PDTS) also controls the data link operation and sequencing and tests its own performance during operation.

Abstract: 1.

Abstract: An active microwave seeker for missile guidance against ships or permanent and targets. Frequency agility and pulse time compression are employed as means to provide a capability for tracking small targets in heavy sea clutter, to reduce target angular scintillation, and to reduce susceptibility to enemy jamming. The seeker tracks a selected target in yaw and range, and keeps its antenna pointed toward the target in pitch by use of its own altitude control.

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.