targets will disappear from the display. Targets around own ship may then not be shown as
potentially dangerous targets.
Warning: At increasing levels of sea clutter, some targets cannot be
detected even by means of the sea anti-clutter filtering, since buoys or other
small objects are producing echoes of a level lower than the ones coming
from waves.
The value of the sea anti-clutter should be set so that the clutter is seen as small dots, and
small targets will become distinguishable around the ship.
Sea anti-clutter has a manual mode and an automatic mode. The system includes predefined
settings for calm, moderate and rough sea state conditions.
Adjusting the sea anti-clutter
To adjust the sea anti-clutter:
• Press the sea key to activate the function, then turn the rotary knob to adjust the setting
• Press and hold the key to turn ON/OFF the automatic option
Rain anti-clutter
Rain anti-clutter is used to reduce the effect of rain, snow or other weather conditions on the
radar image. When you increase the value, the sensitivity of the long distance field clutter
caused by rain is reduced. The value should not be increased too much as this may filter out
real targets.
If the precipitation is located over the ship's position, the adjustment of rain clutter will affect
the presentation of near echoes.
Rain anti-clutter has a manual and an automatic mode.
Adjusting the rain anti clutter
To adjust the rain anti-clutter:
• Press the rain key to activate the function, then turn the rotary knob to adjust the setting
• Press and hold the key to turn ON/OFF the automatic option
Performance limitations
The figures below show how the amount of rain and pulse length affect the detection range
(in NM) for X-band and S-band radars.
The vertical axis (A) is reduction of range for first detection of a target. The horizontal axis (B)
is the original range for first detection of a target.
As an example for long pulse length: a target that can be detected at 10 NM can only be
detected on 3 NM with 16 mm rain.
28
Adjusting the radar image | R5000 Operator manual
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