Suppress Rain/Snow Clutter [Auto-Rain] - JRC JMA-5212-4/6 User Manual

3.4.7 Suppress Rain/Snow Clutter [AUTO-RAIN]

When using the manual rain/snow clutter suppression function
Procedure 1 Control the rain/snow clutter returns on the radar display by turning the
[AUTO-RAIN] control until targets can be easily observed.
Turning [AUTO-RAIN] control clockwise suppresses rain/snow clutter returns.
Turning [AUTO-RAIN] control counterclockwise intensifies rain/snow clutter returns.
When the [AUTO-RAIN] control is turned clockwise, the rain/snow clutter suppression
function suppresses rain/snow clutter returns and gets targets hidden by rain/snow clutter
returns to appear on the radar display. However, be careful that excessive suppression may
cause small targets to be overlooked. Since the rain/snow clutter suppression function also
has the effect of suppressing sea clutter, the suppression efficiency improves when the
[AUTO-RAIN] control is used with the [AUTO-SEA] control. In general, turn the
[AUTO-RAIN] control fully to the left.
Using AUTO RAIN (automatic rain/snow clutter suppression function):
Rain/snow clutter suppression can be performed in accordance with the level of rain/snow
clutter. Use this function when the clutter level changes with the direction.
Procedure 1 Press the [AUTO-RAIN] control.
AUTO RAIN is selected, and RAIN AUTO is indicated at the lower left of the radar
display. Rotating the AUTO RAIN control and AUTO SEA control can make fine
adjustments manually.
Note: When AUTO RAIN is selected, AUTO SEA is switched to the manual mode.
AUTO SEA and AUTO RAIN cannot be selected at the same time.
Use the AUTO RAIN mode to set both the AUTO SEA and AUTO RAIN to automatic mode
simultaneously.
Caution
When using the [AUTO RAIN] function, never set the
suppression level too high canceling out all image
noises from the rain or snow at the close range.
Detection of not only echoes from the rain or snow but
also targets such as other ships or dangerous objects
will become inhibited.
When using the [AUTO RAIN] function, make sure to
choose the most appropriate image noise suppression
level.
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3.4 BASIC OPERATIONS
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