Radar image processing at the LEOK
In the 1950s – 1960s, the radar displays only showed a rough indication of detected objects. For a better insight into the surroundings of a ship, it was desirable to mix the radar image with a chart image on the radar panorama picture tube (operator display). The LEOK designed a compact chart display unit. The design has been kept as simple as possible. Therefore, the unit does not contain any objective. A slide with the chart image is mounted tightly against the screen of a light spot scanner. The light is reflected back to the photocell by the angled flat mirror (front, right). The image signal from this photocell is amplified in the video amplifier (rear, right) and then mixed with the radar signal.