Raster scan generator for plan view display
AssigneeThe United States of America as represented by the Secretary of the Navy
InventorScott R. Osborne
Life of this patent
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Abstract
A digital apparatus for generating a raster whose scan parameters can be ered and controlled by an external program. In addition to standard horizontal sweep, the raster can display a "waterfall" scan, range bearing sweep and various other geometrical patterns. A selector switch permits the raster scan unit to be selectively connected to either a computer or a control panel which provide the parameters for specifying any one raster.
Claims6
A raster scan generator of the type receiving instructions from an external source and for generating different formats of rasters for a plan view display comprising,
- interface means connected with an external source for receiving parameters for raster patterns,
- an angle accumulator connected with said interface means for computing angles of rotation for successive lines of a raster pattern, and providing incremental horizontal and vertical values for generating each line of a raster pattern,
- position accumulator means connected with said angle accumulator for calculating the starting position of each raster line, for computing the position sweep of each raster line and for generating a blanking signal for said plan view display, and
- time means generating timing and sequencing signals for generating each raster line.
A method of generating different formats of rasters for a plan view display from data received from an external source comprising the steps of,
- computing the angle of rotation of successive lines in a raster and calculating the incremental change of horizontal and vertical values used to generate each line in a raster, and
- then generating the starting position of each raster line by adding the incremental changes of horizontal and vertical values to starting values received from said external source.
Dependencies are inferred from the claim text.