Abstract: In an image display, the video information may be keyed to the position of the electron beam by sensing the beam deflection voltage. A keying system utilizes means for generating a reference voltage which is proportional to the anode voltage and means for comparing the reference voltage to the deflection voltage for the electron beam. When a predetermined relationship between the two voltages, such as equality, is reached; the comparing means produces an output which indicates the deflected position of the electron beam. The output of the comparing means can be used to switch the video information to modulate the electron beam.

Abstract: A phase coherent canceller for jamming suppression is provided with a variable controlled oscillator which is locked in frequency and phase to a reference local oscillator in a closed loop configuration.

Abstract: A self-regulating deflection circuit includes a first inductor and switching transistor coupled across the unregulated voltage supply. A damper diode, retrace capacitor and second inductor are coupled in parallel, and the parallel combination is coupled across the transistor by a first rectifier poled to prevent current from flowing from the first inductor to the second inductor. A second rectifier is coupled between the first and second inductors for transferring energy from the first inductor to the second during the retrace interval. A control circuit coupled to the second inductor and to the base of the switching transistor controls the time during the first half of the trace interval during which the transistor conducts to allow energy to be stored in the first inductor. A storage capacitor is coupled in series with the second rectifier. Charge accumulation on the storage capacitor and resultant blocking of the second rectifier is prevented by a resistor coupled across the storage capacitor.

Abstract: A base band radio speed sensor, for use with the path of travel of the craft whose speed is to be sensed advantageously disposed at right angles to the antenna patterns, utilizes a transmitter flanked by equally spaced receivers for determining the times of passage of the craft with respect to symmetrically disposed receiver antennas.

Abstract: A target extractor for radar systems which accurately determines the radial position of the target within the range cell containing the target. The azimuth of the target is determined by conventional extractor systems. An incremental target range is located with respect to a primary range cell boundary. The primary range cell is selected as the range cell which contains the maximum number of reflected transmitter pulses. The number of reflected transmitter pulses received in secondary range cells located radially below and radially above the primary range cell is determined by the target extractor. The target extractor also determines the ratio of the pulses detected in the secondary range cells which are located radially on each side of the primary range cell. The location of the target defined within the radial dimension of the primary range cell is determined by interpolation circuitry in the target extractor.

Abstract: The disclosed system is intended to supply angular and range data regarding the position of an object to be located in a reference system. The system comprises an interrogator which transmits a linearly frequency-modulated signal to a transponder disposed on the object. The transponder is provided with means for shifting the frequency of the received signal in one direction by a predetermined amount characteristic of that transponder and means for retransmitting the received signal. The interrogator further includes a pair of receiving antennas whose signals are used for forming beat signals with the transmitted signal. The interrogator is also provided with means for shifting the frequency of the beat signals in the other direction by the same amount. At least one of the shifted beat signals is applied to a frequency discriminator whose output signal is utilized for controlling the slope of the modulation signal in order to keep the frequency of the shifted beat signal constant.

Abstract: A base band transmitter cooperates with dual base band receiver antennas, a single receiver channel, and a tapped delay correlator device for the prevention of vehicular collisions, the configuration effectively narrowing the normally wide base band antenna pattern to span a single predetermined forward traffic lane.

Abstract: 1. An automatic radar jamming transmitter comprising a plurality of voltatuned magnetrons each adapted to be tuned over a prescribed wide range of frequencies, discrete voltage tuning means in circuit with each of said magnetrons respectively whereby each of said magnetrons initially and simultaneously generate radio-frequency energy at prescribed discrete frequencies, means for simultaneously varying said discrete voltage tuning means in a random manner whereby the discrete outputs of said magnetrons comprise simultaneously generated frequency modulated noise signals, means for amplifying said noise signals, and means in circuit with said amplifying means for producing random changes in the amplitudes of said noise signals.

Abstract: A radar reflector for buoys and other floating objects comprising six identical corner reflectors circumferentially evenly spaced about the main reflector axis. The axes of symmetry of said six corner reflectors define angles of about 90.degree. with said main reflector axis and the apertures of said corner reflectors are outwardly directed and alternatingly disposed in inverted relation with respect to one another. The three plates of each corner reflector are enlarged up to the intersection lines with the plates of adjacent corner reflectors and to the intersection line, respectively, with an assumed cylinder surface circumscribing the total reflector assembly.

Abstract: Apparatus for detecting radar echo signals with a high degree of certainty in the presence of noise. A predetermined number of consecutive, constantly changing intervals are produced having a length equal to the radar pulse width. The resolution of the system is a function of the number of signal positions chosen for examination within each interval. A secondary signal is produced for each signal position and these secondary signals are summed over preselected resolution intervals. A weighting arrangement is provided which weights the individual secondary signals inversely with their distance from the central resolution interval of the set.

Abstract: A vehicle collision preventing apparatus determines the danger by an output of a radar for detecting the distance to an obstacle and the relative velocity in a danger determining circuit wherein the distance to the obstacle and the relative velocity at the present are estimated from the data given before disappearing the data of the radar by an estimate arithmetic circuit when a signal reflecting from the obstacle reduces to be incapable of detecting the obstacle by the radar.

Abstract: A performance monitor for use with marine radars which produces a visual indication upon the radar display screen only when the radar transmitter power, and the radar receiver sensitivity and tuning are within predetermined limits. An RF sample of the radar transmitted signal is mixed with a local oscillator signal and the resulting IF signal is coupled to an AFC loop which controls the frequency of the local oscillator. If the amplitude of the radar transmitted signal is above a threshold level, a single frequency response signal of fixed power is generated by the performance monitor and transmitted back to the radar antenna. A distinctive test pattern is produced upon the radar display if the radar receiver tuning is accurate and its sensitivity is sufficiently high.

Abstract: A radio frequency burst signal memory system is described which includes a feedback loop for recirculation of the received RF burst signal when a proper burst signal is detected. The output from an RF amplifier is split into separate frequency bands by a diplexer. When one of these bands is sensed at the input, only signals of the sensed frequency band are recirculated.

Abstract: A battlefield identification friend or foe (BIFF) system comprising a radar nit including a switch for selectively connecting an interrogation encoder to the modulator of a radar unit and a response decoder also located at the radar site. At a remote station is a transponder which includes an interrogation decoder which, when properly interrogated, activates the transponder/transmitter which then transmits a coded response message.

Abstract: An improvement of a vehicle collision anticipating method and device using transmitted and reflected frequency-modulated continuous waves is provided. A low frequency wave is produced by mixing a part of transmitted wave and a reflected wave from the object. The low frequency wave and a Doppler signal obtained from the low frequency wave are signal processed so as to generate signals. A predetermined distance range is obtained by multiplying a time which is determined by the distance between the vehicle and object and the velocity of said object with respect to the vehicle obtained from the Doppler signal, by a relative velocity of the object with respect to the vehicle. A collision of the object against the vehicle is anticipated by detecting the object entering the predetermined distance range in front of the vehicle.

Abstract: A high speed driver circuit for the magnetic deflection yoke of an orthogonal channel displaying high speed alphanumeric characters, or the like, includes a first input receiving a stored signal proportional to the derivative of the vector slope component and a second input receiving a positive feedback from the yoke sense resistor. At high frequencies the yoke current is primarily inductive so that the voltage across the yoke is proportional to the rate of change of current through the yoke, hence, this voltage, when properly connected by positive feedback, is also proportional to the derivative of the voltage across the magnetic deflection yoke. By combining this voltage waveform directly within the vector slope signal, the need for an active integrator in the closed loop driving the magnetic deflection yoke is eliminated.

Abstract: Ground clutter is automatically eliminated from echo signals in a weather pulse radar system to provide signals having an amplitude corresponding to the average intensity of the weather echo over a number of pulses. The reflected waves received in the receiver are linear-detected to provide echo signals. Each one of successive echo signals is compared with another later one which is apart from the each one echo signal by a predetermined time period during which fluctuation of weather target becomes independent, to derive an AC component signal corresponding to the fluctuation. The variance of the amplitude of the derived signal is proportional to the mean power of the weather echo. Thus, the ground clutter and the DC component of the weather echo are eliminated. The AC component signals are unipolarized and, thereafter, averaged. The averaged signals have an amplitude corresponding to the average intensity of the weather echo.

Abstract: Disclosed are a convergence device consisting of a circuit for generating a signal in synchronism with the horizontal sync signal and a circuit for generating a sinusoidal waveform current in response to the output signal from the signal generating circuit so that part of the sinusoidal waveform current may be used as a convergence correction or adjustment current, and a color television receiver incorporating the convergence device of the type described and capable of enlarging part of a picture.

Abstract: A digital radar including (i) a digital memory whose stored array of digital words represents radar searched space and (ii) display smoothing apparatus receiving the memory data and quadrupling the number of digital words available for display. Typical of the preferred embodiment, a four digital word group comprising W.sub.a, W.sub.b, W.sub.c, and W.sub.d, and representing four mutually contiguous searched space segments is used to produce the average of W.sub.a and W.sub.b, the average of W.sub.a and W.sub.c, and the average of all four in the group. The averages and the memory words are painted on a display in their appropriate locations.

Abstract: A circuit for generating a saw-tooth current waveform in a coil comprises a parallel resonant circuit, of which the coil in which the saw-tooth current is to be generated forms part. The parallel resonant circuit includes two capacitors in parallel and a first diode, in parallel with one of the capacitors, and in parallel with which is a switching transistor connected via a second diode to the cathode of the first diode. Input energy from a power source is fed to the junction between the second diode and the switching transistor via an inductance which forms a resonant circuit with a further capacitor forming at least part of a reactance in parallel with the second diode.