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-1.27-
ES OFF ES1 - Enlarged in
bearing direction
Use on range 1.5-12
nm
ES2 - Enlarged in
range direction.
Invalid at P/L S1 and
S2
Use on range 1.5-6 nm
ES3 - Enlarged in both
bearing and range
directions
To enlarge more than ES 2
Notes:
1) If the 1.5 nm range is preset with a pulselength of S1 or S2, and the 3 nm scale with S2,
the echo stretch is not available on these range scales.
2) The echo stretch magnifies not only small target pips but also returns (clutter) from sea
surface, rain and radar interference. For this reason make sure these types of interference
have been sufficiently suppressed before activating this function.
1.23 Echo Averaging
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 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, this radar performs scan-to-scan correlation.
Correlation is made by storing and averaging echo signals over successive picture frames. If
an echo is solid and stable, it is presented in its normal intensity. 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, it is recommended to first suppress sea clutter with
the A/C SEA control and then do the following: