Digital scan converter

Details Digital scan converter Digital scan converter

1977-02-07

1978-12-05

Hubler, Malcolm F.

Communications: radio wave antennas

Antennas

Balanced doublet - centerfed

G01S 706, G01S 902

Patent

active

041288386

ABSTRACT:
In a digital scan converter for displaying video data provided by a radar sensor on a raster scan display, the video data is stored in a radar input buffer at addresses corresponding to the pattern according to which the field of view of the radar sensor is scanned, and taken over in a random-access memory. The random-access memory consists of N .times. N submemories, all containing a .times. a memory elements and all being simultaneously accessible. For the range scan in any azimuth value (.phi.) the range considered is divided into n (n.ltoreq.N) segments of each i k range increments .DELTA.r, where the length k.DELTA.r of each of said segments equals at least the range represented by "a" memory elements, multiplied by a factor .sqroot.2. An address generating circuit generates the addresses x = x.sub.c + (lk+m).DELTA.r cos .phi. and y = y.sub.c + (lk+m).DELTA.r sin .phi. where x.sub.c and y.sub. c represent the coordinates of the radar sensor position, l = 0, 1, 2, . . . , n-1 in each memory cycle, and m = 0, 1, 2, . . . , k-l, to accommodate the data read from the input buffer in the random-access memory at locations corresponding to the display line pattern to be realized on the raster scan display. The relevant data for each picture line is read from the respective N submemories simultaneously and placed in a picture-line memory storing the data of a picture line in order to be readout in the sequence as required for representation on the raster scan display.

REFERENCES:
patent: 3683373 (1972-08-01), Barnes et al.
patent: 3765018 (1973-10-01), Heard et al.
patent: 3810174 (1974-05-01), Heard et al.
patent: 4002827 (1977-01-01), Nevin et al.

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