Furuno MFD8 Guía Del Usuario
6. Radar
6-19
6.15
Echo Stretch
The radar adjusts the reflected echoes from long-range targets, but the echoes are
normally displayed weak and small. If you have a weak, long-range target that re-
quires closer inspection, use the echo stretch to magnify the target.
normally displayed weak and small. If you have a weak, long-range target that re-
quires closer inspection, use the echo stretch to magnify the target.
This function magnifies the targets and sea clutter and radar interference. For this rea-
son, correctly adjust the sea clutter and radar interference before you activate the
echo stretch.
son, correctly adjust the sea clutter and radar interference before you activate the
echo stretch.
To activate or deactivate the echo stretch:
1.
Long-push the RotoKey.
2.
Use the RotoKey to select [Filters].
3.
Use the RotoKey to select [Stretch] then push the key to activate or deactivate
the echo stretch.
the echo stretch.
6.16
Echo Average
The echo average feature effectively suppresses sea clutter. Echoes received from
stable targets such as ships appear on the screen at almost the same position during
every rotation of the antenna. On the other hand, unstable echoes such as sea clutter
appear at random positions.
stable targets such as ships appear on the screen at almost the same position during
every rotation of the antenna. On the other hand, unstable echoes such as sea clutter
appear at random positions.
To distinguish real target echoes from sea clutter, echo average performs scan-to-
scan correlation. Correlation is made by storing and averaging echo signals over suc-
cessive picture frames. If an echo is solid and stable, it is presented in its normal in-
tensity. Sea clutter is averaged over successive scans resulting in the reduced
brilliance, making it easier to discriminate real targets from sea clutter
scan correlation. Correlation is made by storing and averaging echo signals over suc-
cessive picture frames. If an echo is solid and stable, it is presented in its normal in-
tensity. Sea clutter is averaged over successive scans resulting in the reduced
brilliance, making it easier to discriminate real targets from sea clutter
To properly use the echo average function, first suppress sea clutter with the A/C SEA
control. Then, with the full RotoKey set active, use the RotoKey to select [Filters] fol-
lowed by [Average].
control. Then, with the full RotoKey set active, use the RotoKey to select [Filters] fol-
lowed by [Average].
(a) Echo average OFF
(b) Echo average ON