Abstract: A feature referenced error correction apparatus utilizing the multiple images of the interstage level image format to compensate for positional displacement errors in the synthetic aperture radar imaging. Error compensation is accomplished through the registration of key features of sub-aperture images and by the generation of an error correction signal in response to the sub-frame registration errors.

Abstract: Described herein is a radiation upset threshold detector apparatus for measuring the output from a circuit that is operating in a radiation environment to determine when the radiation upset threshold is exceeded for the circuit.

Abstract: A low voltage two wire to four wire telephone circuit converter apparatus utilizing a series pair of amplifiers to provide a transmit data out signal that is referenced to analog ground. A pair of amplifiers in parallel to receive a receive data in signal which is referenced to analog ground and apply it to the telephone unit. A signal adapter converts the telephone ring signal to a constant one level for transmission over a digital channel in a fiber optic link.

Abstract: A phase-locked voltage controlled oscillator for generating frequency modulated waveforms having a programmable digital RF phase shifter to determine the phase difference between the output signal and a phase corrected reference signal to thereby generate the desired output waveform.

Abstract: An intrusion detection apparatus utilizing a plurality of bistatic pulse-overlap Doppler radar units to detect target Doppler frequency shifts in an enclosed sensitive volume and utilizing a single RF frequency with different pulse repetition rates to synchronize the bistatic receiver unit with its associated transmitter unit.

Abstract: A target processor utilizing a feedback loop to maintain a constant false alarm rate for variable level video input signals with noise or noise plus clutter on the input signal. The processor includes three serially connected stages of binary coincidence detectors which comprise a threshold detector for processing video signals which exceed a threshold level, an M of N detector for providing an alarm for each range gate having a count of M or greater pulses, and a P of Q detector for generating a target alarm after at least P or greater frequencies have been transmitted.

Abstract: A battery tester apparatus having a discharge circuit with a visual indicator that the discharge cycle is in progress operating in combination with a comparator to determine when the terminal voltage of the battery is reached. At this point the comparator provides a signal to an oscillator which in turn controls an SCR diode switch that terminates the discharge cycle.

Abstract: An angle set on apparatus for an electronic countermeasure system utilizing a single dual mode phased array antenna which is operated under receiver/processor control to serve as both a transmit and receive element thereby avoiding the need for a separate direction finding system and, since transmit and receive functions share the same antenna, eliminating the need for precision pointing accuracy. The receiver/processor unit would continue to identify emitters using the jamming unit's receive antenna element and, where appropriate, PRI trackers would be assigned. The time of arrival window would then be used to blank the transmitter signal and to switch the phased array to the receive mode. During sequential time of arrival windows the receiver/processor would vary the pointing angle of the phase array until the emitter angle of arrival is determined and stored in memory.

Abstract: A millimeter wave measurement apparatus utilizing a phase-locked transmitter to generate a millimeter wave-signal and a phase-locked local oscillator receiver to receive the transmitted millimeter wave signal. A conventional microwave receiver unit receives the IF signal from the millimeter wave receiver and downconverts the IF signal for detection and measurement.

Abstract: A high power halogen-filled vial stage receiver protector utilizing an RF priming source in conjunction with a pair of circular guides to provide a continuous supply of priming free electrons to the halogen gas-filled plasma limiter vial.

Abstract: A radar calibration apparatus for the metric measurement of ground position by airborne photogrametry using real time high precision imagery, the transformation of those measurements from camera coordinates to antenna coordinates, the conversion of transformed coordinates to direction cosines of a measured ground position, comparison to radar derived direction, and the calculation and automatic correction of bias errors in direction of the radar measurement.

Abstract: An apparatus for generating a variable data base file from a single original entry control datum. The apparatus utilizes a microprocessor unit to interact with a logical number generator to modify the original entry control signal into a larger data base which may be similar to but not identical to the original datum signal.

Abstract: The process of fabricating a dielectrically isolated junction field effect transistor and a PNP transistor on a common substrate. An epitaxially layer is deposited on the base substrate to form the channel region of the junction field effect transistor. Impurities for the source and drain of the field effect transistor are diffused into the epitaxial layer. Impurities to form the gate are diffused into the epitaxially layer between the source and gate regions but separated therefrom. The PNP transistor which is dielectrically isolated from the field effect transistor by grooves, is formed by the diffusion into the base substrate of the respective impurities that form the base, collector and emitter regions of the PNP transistor.

Abstract: An antenna apparatus for use in space which is foldable into a small package for storage in a space vehicle. The antenna apparatus utilizes a plurality of hinged members and diagonal tapes forming parallelogram frames, two opposite sides of which are hinged at the center to fold the frames in a given plane. Similar frames are hinged on the first frames in a second plane whereby a plurality of cubes are formed when all are unfolded.

Abstract: A dual mode directionally coupled band reject filter apparatus having coaxially aligned first and second cylindrical cavity members which are asymmetrically mounted to the broadwall of a waveguide. Both cylindrical cavity members include a plurality of tuning screws to establish elliptic-type responses.

Abstract: A two carrier dual injector semiconductor apparatus utilizing a pair of injector gates for simultaneously injecting holes and electrons into a series stack of insulator layers. The stacked insulator layers which may be arranged in a MIM or MIS configuration have injecting layers near opposing metal gates for injecting either electrons as holes into the insulator layers depending upon the polarity of the applied bias voltage. The apparatus is capable of high-current low-voltage carrier injection while maintaining a stable trapped spaced charge within the stack of insulator layers.

Abstract: An RF laser array driver apparatus with a DC bias input and and RF input to modulate a diode array and provide a modulated optical output. The driver circuit comprises a series impedance which is in parallel with the diode array to provide a 50 ohm impedance to the RF input signal that is substantially constant with frequency.

Abstract: A mirror actuator control system utilizing a wavefront sensor to determine the resulting angle error signal between the wavefront tilt angle and the mirror tilt angle. The resulting angle error signal is used to drive the actuator unit which controls the mirror tilt angle.

Abstract: The rippled-field magnetron is a novel cross-field millimeter wave source in which electrons move under the combined action of a radial electric field, an axial magnetic field and an azimuthally periodic wiggler magnetic field, .vertline.B.sub.w .vertline. cos (N.theta.) oriented transversely to the flow. Estimates are given of the frequency and growth rate of the free electron laser (FEL) type of instability excited in this smooth-bore magnetron configuration.

Abstract: A hardwire missile receiver coupled line apparatus is inserted between the antenna output port and the receiver input in a missile communication link to allow signals to be coupled directly into the missile receiver before the missile launch. At launch, the cable to the side of the missile is pulled from the side of the missile. After the cable is pulled, the open circuited cable between the side of the missile and the coupling network does not degrade the signal transmission from the antenna to the receiver.