Chapter 2 Basic operation (Panel) MDC-2900
Series
2-8
0093129012-06
2.8 Reject sea clutter (anti-SEA)
MAN (manual) SEA and AUTO (automatic) SEA are provided
for anti-SEA function. On the rough sea, SEA clutter noise
appears around antenna position (center spot), and short
distant targets are masked and not recognizable. In that case,
anti-SEA function suppresses SEA clutter noise and reveals
masked target echoes. Recommended adjustment of anti-SEA
is to adjust to make echoes from SEA clutter vaguely displayed
by dark level.
If [SEA] level is too high to show sea clutter noise, short distance
gain is over suppressed and it may result in loss of targets like
buoys and small ships.
On the other hand, if [SEA] level at top left side of the screen is too
low, clutter noise around antenna position (center spot) is
displayed by high intensity level and it makes difficult to
discriminate small ships and buoys from sea clutter.
Anti-SEA is effective to suppress false echoes and ground clutter
in short distance. However adjustment of GAIN should be used
beyond effective coverage of anti-SEA.
If target echoes are masked by excessive false echoes within anti-SEA effective, then adjust MAN SEA
to confirm it. Excessive anti-SEA may lose echoes from small ships and buoys. So, return to
appropriate anti-SEA level for normal use.
• Small target becomes harder to detect when SEA is used together with RAIN.
• Adjustment is not available while RAIN is set to CFAR (Constant False Alarm Rate).
Refer to “
Reject rain/snow clutter (anti-RAIN)
” (page2-10)
Selection of MAN SEA and AUTO SEA
By control-knob
When the [SEA]-knob is pressed, [AUTO SEA] and [MAN SEA] change alternately.
By trackball
1
Roll the trackball to place the + CURSOR on the [MAN] or [AUTO] (whichever is shown) at right
side of [SEA] on the top of the display.
2
Push the [ENT] key to display [AUTO] or [MAN] as appropriate.
SEA clutter at center
after Adjusted MAN SEA
Summary of Contents for MDC-2900
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Page 33: ...Chapter 2 Basic operation Panel MDC 2900 Series 2 2 0093129012 06 2 2 Name of radar display 3 ...
Page 157: ...Chapter 4 General operation Menu MDC 2900 Series 0093129012 06 4 54 MAP ...
Page 158: ...MDC 2900 Series Chapter 4 General operation Menu 0093129012 06 4 55 ERBL LINE RING MAP ...
Page 159: ...Chapter 4 General operation Menu MDC 2900 Series 0093129012 06 4 56 MAP LAT LON LINE ...
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