Accession Number : ADD005507

Title :   Display of Variable Length Vectors.

Descriptive Note : Patent,

Corporate Author : DEPARTMENT OF THE ARMY WASHINGTON D C

Personal Author(s) : Terranova,A P ; Murphy,F J

Report Date : 13 Jun 1978

Pagination or Media Count : 4

Abstract : A variable length vector display system allows visual indication of the speed and direction of aircraft or moving vehicles, maintaining a constant illumination on the face of a cathode ray tube independent of the vector length or vector movement. The vector length from the target vehicle coordinate points to the predicted intercept coordinate points are displayed. Voltages defining the origin and the end point of a vector to be displayed are coupled through respective comparator and arithmetic units, scaled to provide a deflection factor, multiplied, and coupled through respective controlled integrator circuits. The integrators are controlled by a variable gate which operates as a function of the input signal, thereby varying the on-off time of the integrators for simultaneous operation. Output signals from the integrator circuits are coupled to respective X and Y deflection circuits of a cathode ray tube load. In conjunction with the input zero reference or origin signal the signals are combined to provide the appropriate X and Y deflection potential for the tube. (Author)

Descriptors :   *Patents, *Cathode ray tube screens, *Vector spaces, Illumination, Intensity, Cathode ray tubes, Gates(Circuits), Sweep generators, Comparators, Signal processing

Subject Categories : Electrooptical and Optoelectronic Devices

Distribution Statement : APPROVED FOR PUBLIC RELEASE