Display range marker processor

Details Display range marker processor Display range marker processor

G - Physics

01

S

343/54

G01S 7/22 (2006.01) G01S 7/06 (2006.01)

Patent

CA 1119700

DISPLAY RANGE MARKER PROCESSOR Abstract of the Disclosure A variable range marker processing device for use with a PPI radar with digitized video displayed in non-real time. The position of the range marker is initially operator deter- mined by rotation of a knob mechanically linked to an optically encoded disc. Optical sensors produce a digital output indica- tive of tile disc rotation angle and range mark position as a distance from the center of the radar display screen. A counter is preset with the digital output at the start of each sweep and decremented once each range cell until a count of zero is reached at which time an unblanking pulse is produced. A numeric display of range is produced by dividing the number of range cells to the range mark by the range setting, scaling according to chosen units of measure, and displaying the result with a LED display, the computations being performed by a processor controlled by a permanently programmed memory. The range mark stays on target as the range scale is changed. The amount of movement of the range mark for a given amount of con- trol rotation is independent of range scale.

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