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BASIC RADAR THEORY
22
■ Multiple echoes
Multiple echoes may appear when a short-range and
strong echo is received from a ship, bridge, or break-
water.
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]/[ ] control.
See p. 10 for the [SEA]/[ ] control.
True echo
False echoes
Own ship
Another ship
■ 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.
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.
This target can not be recognized with radar.
The target in this area can not be recognized.
Pulse length
Pulse starting point
Vertical beam width
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