Table of Contents
Advertisement
8
BASIC RADAR THEORY
I Multiple echoes
Multiple echoes may appear when a short-range and
strong echo is received from a ship, bridge, or break-
water.
Own ship
I Minimum range
Detection at short range is very important. Minimum
range is determined primarily by transmitter pulse
length, vertical beam width and height of the scanner
unit. The shorter the transmission time, the quicker the
return echoes can be received and their distance mea-
sured.
22
Another ship
Pulse length
Pulse starting point
Multiple echoes will appear beyond the target's true
echo point on the same bearing of a large target. They
can be reduced with proper adjustment of the
[SEA]/[
See p. 10 for the [SEA]/[
The ability to see targets very close to the ship is de-
creased if the scanner is mounted too high off the
water, because the bottom of the vertical beam of the
scanner cuts off nearby targets.
Vertical beam width
This target can not be recognized with radar.
The target in this area can not be recognized.
] control.
] control.
False echoes
True echo
Advertisement
Table of Contents
