Abstract: Apparatus for motion detection and tracking of objects in a region for collision avoidance includes a signal transmitter which provides first and second detection signals for at least partial reflection by an object located in a spatial region. The apparatus further includes a signal receiver for receiving the deflected first and second detection signals corresponding to first and second object parameter data signals. The apparatus further includes a Fourier transform circuit for receiving the first and second object parameter data signals and providing first and second Fourier transform object parameter data signals. The apparatus further includes a probabilistic neural network for receiving and sorting the first and second Fourier transform object parameter data signals without the use of a priori training data.

Abstract: A method and apparatus for use with a multichannel receiver to eliminate signal sidelobes within a received signal time frame is disclosed. The elimination of signal sidelobes within a channelized receiver is accomplished by using an analog preprocessor. The analog preprocessor is capable of producing an amplitude mask based upon the determination of the greatest amplitude and frequency channel in a two-dimensional receiver system or frequency channel and time slot in a three-dimensional receiver system signal. The amplitude mask covers a predefined space in time and frequency equal to or below the peak signal amplitude. A signal in the frequency/time cell space covered by the mask must have a magnitude exceeding the magnitude of the amplitude mask in order for the signal to pass through the analog preprocessor for further processing.

Abstract: The tubes of tube and shell heat exchangers destructively vibrate at certain velocities with which fluid flows over their outside surfaces. An acoustic generator is positioned to respond to the fluid vibrations generated by the tubes. The structure of the acoustic generator is sized and arranged to produce a modulated tone representative of tube vibration. A detector mounted external the heat exchanger shell responds to the tone to initiate corrective action which will reduce the tube vibration.

Abstract: A current limiter for an a.c. circuit having two FET's connected source to drain. The FET's are biased for symmetrical bipolar operation with source resistors for self-biasing. In operation one FET operates as a source follower and the other as a current source.

Abstract: A closed loop controlled amplifier operable on low power is disclosed. The amplifier utilizes a relatively slow, high voltage transistor that is saturated during the active sweep and cut off during the retrace. A dampening network is included which operates during the active horizontal deflection time. A current feedback is derived from the horizontal deflection yoke to stabilize and control the amplifier.