Adjusting The Radar Image; Gain; Rain Anti-Clutter; Sea Anti-Clutter - Simrad R2009 User Manual

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Adjusting the radar image

You may improve the radar image by adjusting the gain, by filtering out unwanted echoes
due to sea clutter, rain or other weather conditions, and by tuning the sensitivity of the radar
receiver.
Note:
Tuning is only available for HD radar sensors.
Note:
The radar image settings do not affect the AIS targets.
Sea and rain clutter could be present at the same time and further degradation in detection
performance will be experienced. As sea clutter is related to short range and rain clutter is
usually present in a longer range, rain clutter settings can be adjusted without affecting the
echoes in the sea clutter area.
Some functions include both a manual and an automatic mode. It is recommended to use
the manual mode only if the automatic mode doesn't provide satisfactory results.
The radar image is controlled by dedicated softkeys as described in the next sections.
Note:
It is recommended to turn Trails OFF when you adjust the radar image as trails
might hinder the proper video adjustment feedback.

Gain

The Gain option controls the sensitivity of the radar receiver. A higher gain makes the radar
more sensitive to radar echoes, allowing it to display weaker targets. If the gain is set too
high, the image might be cluttered with background noise.
Note:
The Gain control shall not be used to clean the picture from sea or rain clutter.
The value of the Gain should be set so that the background noise is just visible on the radar
panel.
At start-up of the system, the Gain is 80% in order to receive the optimum noise level.
Gain has a manual and an automatic mode.
You adjust the gain by using the GAIN softkey:
• Press the softkey once to activate the function, then turn the rotary knob to manually
adjust the setting
• Press and hold the softkey to turn on/off the automatic option
• Press the softkey twice to display the Gain pop-up, then press the ENT 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.
Rain anti-clutter has no automatic mode.
You adjust the rain anti-clutter by using the RAIN softkey:
• Press the softkey once to activate the function, then turn the rotary knob to manually
adjust the setting.

Sea anti-clutter

The Sea anti-clutter option is used to filter the effect of random echo returns from waves or
rough water near the vessel. When you increase the value, the sensitivity of the near field
clutter caused by waves is reduced. If the value is increased too much, both sea clutter and
targets will disappear from the display and targets around own ship may not show
potentially dangerous targets.
Adjusting the radar image | R2009/R3016 User manual 19