
THE RADAR SYSTEM - OPERATIONAL PRINCIPLES
with calibration signals before being displayed. The
latter operations are more conveniently described under
the heading of display principles below.
2.6 Display principles
The function of the display is to present the radar picture
in such a way that, where a detectable response is retur-
ned, the observer may reveal the presence of the echo,
measure its range and bearing, and track the movement
of the target which has produced it.
From the invention of radar to the present day the
radar picture has been presented on the screen of a
cathode ray tube and this is likely to continue to be the
case for