| 摘要 |
<p>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 x N submemories, all containing a x 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</=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 2ROOT 2. An address generating circuit generates the addresses x = xc + (lk+m) DELTA r cos phi and y = yc + (lk+m) DELTA r sin phi where xc and y 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.</p> |
