| 摘要 |
<p>PURPOSE:To enable the displaying of raster scan, by a method wherein a high frequency band of a radar low video signal is converted with an A/D converter operating in a time-sharing manner to be stored into a memory and after subjected to a D/A conversion, it is imparted a synchronous signal. CONSTITUTION:A radar low video signal 12 is converted with A/D converters 4 and 5 operating alternately and outputs 17 and 18 thereof are stored into a frame memory 7 as video data 21 through a switching circuit 6. On the other hand, an antenna angle rotation signal 10 corresponding to a bearing is converted with an A/D converter 1 into an X address 13 while a timing control circuit 3 outputs a counter increment signal 16 to a counter 2, starting at the time when a radar trigger signal 11 is inputted, to obtain a Y address 14 corresponding to a distance and each time the signal 11 is inputted, a writing timing signal 15 is stored at an address of a memory 7 as prescribed by addresses 13 and 14. Thereafter, the signal is converted into a video signal for a raster scan display with a D/A converter 8 and displayed on a CRT 9.</p> |
