Accession Number : ADD009393

Title :   Radar Video Compression System.

Descriptive Note : Patent,

Corporate Author : DEPARTMENT OF THE NAVY WASHINGTON DC

Personal Author(s) : Curry,Robert G , Jr ; Wallace,Edward L

Report Date : 08 Dec 1981

Pagination or Media Count : 9

Abstract : A system for time-compressing radar video is disclosed to improve the graphic presentation thereof on a CRT display. Quantized input video is pipelined as cell pairs into and out of a pair of parallelly-arranged memory banks by means of input and output latches. The memory banks are controlled having alternating read and write modes which are interchanged in synchronism with the video scan period so that a preceding scan is read out of one bank at a controlled read clock frequency while a current scan is written into the other bank at a fixed write clock frequency, the degree of video compression being determined by the ratio of the read-to-write frequencies. A pair of series-connected rate multipliers each are fed 6-bit rate words for varying the read clock frequency on either a linear on non-linear scale. Video integration is provided at the inputs of each memory bank by magnitude comparators which compare stored contents of each range cell in the banks with current input video for the respective cell and steer multiplexers to either retain or rewrite the contents of the cell. (Author)

Descriptors :   *Patents, *Video signals, *Radar signals, Cathode ray tube screens, Quantization, Scaling factors, Nonlinear systems, Range(Distance), Red(Color), Multiplexing, Steering, Latches, Compression, Output, Linearity, Cells, Input, Frequency, Reading, Control, Writing, Clocks, Scale

Subject Categories : Active & Passive Radar Detection & Equipment

Distribution Statement : APPROVED FOR PUBLIC RELEASE