| 摘要 |
<p>PURPOSE:To enable fine control, by achieving an expanded display of a part of an area in addition to the total display of a radar screen on a CRT display screen. CONSTITUTION:Receiving a position specifying signal 8, an expanded are setter 9 sets a specified range of a square area centered on a specified position as expanded display area and sends an area setting signal to a reading controller 11, which then controls a PPI (plan position indicator) video reader 10 and a map video reader 13 according to the area set. As a result, the reader 10 takes out a necessary video data from the PPI video memory 2 to be fed to a video mixer 6 as expanded area PPI video 14. Likewise, the reader 13 takes out a necessary map data from a map video memory 3 to be fed to a mixer 6 as expanded area map video 15. Then, display contents within the set area are transferred to an expanded display are for their display. At this point, an expansion rate specifying signal 12 is applied to the control 11, which allows the displaying of the set area in the expanded display area at a specified expansion rate.</p> |
