Variable range marker

Details Variable range marker Variable range marker

1976-08-06

1978-02-28

Hubler, Malcolm F.

Communications: radio wave antennas

Antennas

Balanced doublet - centerfed

G01S 722

Patent

active

040770370

ABSTRACT:
A variable range marker device for use with a PPI radar with digitized video displayed in non-real time. The position of the range marker is initially operator determined by rotation of a knob mechanically linked to an optically encoded disc. Optical sensors produce a digital output indicative of the 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 and displaying the result with a three digit LED display.

REFERENCES:
patent: 2653312 (1953-09-01), Haworth
patent: 2857591 (1958-10-01), Nagel
patent: 3210761 (1965-10-01), Toyoda et al.
patent: 3646557 (1972-02-01), Scheer
patent: 3881176 (1975-04-01), Scheer
"A Fully Automatic Marine Radar Data Plotter", by J. C. Herther et al., J. Inst. Nav. (GB), vol. 24, No. 1 (Jan. 1971), S1324-0009.

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