A fast display processor for sonar echoes

Abstract

This paper presents a display processor for a CRT, which shows a horizontal projection of underwater targets. Sonar echoes are drawn as short lines across a 50 beam, in random scan and with 50 Hz refresh. The high speed requirements is met by digital integration (TTL low power schottky). One of the main advantages of this display processor, relative to alternative principles, such as PPI or raster scan, is brightness. The screen can be viewed in full daylight. This is achieved because the beam spot is positioned only to points with light.