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2. RADAR, CHART RADAR OPERATION
2-5
2.6 How to Suppress Rain Clutter
The vertical beam width of the antenna is designed to see surface targets even when
the ship is rolling. However, by this design the unit will also detect rain clutter (rain,
snow, or hail) in the same manner as normal targets.
The A/C RAIN control adjusts the receiver sensitivity as the A/C SEA control does but
rather in a longer time period (longer range). The higher the setting, the greater the
anti-clutter effect. When echoes from precipitation mask solid targets, adjust the A/C
RAIN control to split up these unwanted echoes into a speckled pattern, making rec-
ognition of solid targets easier.
Be careful not to remove all rain clutter, because you can erase weak echoes. Further,
the possibility of losing weak echoes is greater when you use both A/C RAIN and A/C
SEA to reduce clutter.
When both sea clutter and rain clutter are reduced the sensitivity is decreased more
than when only one is adjusted. For that reason adjust them carefully.
The echo average (see section 2.9) is useful for reducing reflections from the sea sur-
face. However, high-speed targets are harder to detect than stationary ones when the
echo average is active.
2.6.1 How to reduce rain clutter automatically
Control Unit: Push the A/C RAIN control to display [AU-
TO] on the RAIN mode indication on the Status bar.
Trackball module: Click the RAIN mode indication on
the Status bar to display [AUTO].
RAIN mode indication