Furuno 1724C 사용자 설명서

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2. RADAR OPERATION 
 
2-22
2.20 Echo Averaging  
The echo average feature, which requires a Model 18x4/19x4 series network radar as radar 
source, 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. 
 
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 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: 
 
1.  If not displayed, press the HIDE/SHOW key to display the radar soft keys. 
2.  Press the SIGNAL PROC. soft key. 
3.  Press the E. AVG soft key to select desired echo averaging. 
OFF: No averaging 
LOW: Helps distinguish targets from sea clutter and suppresses brilliance of unstable   
      echoes. 
MED: Distinguishes small stationary targets such as navigation buoys. 
HIGH: Stably displays distant targets. 
4.  Press the RETURN soft key to finish. 
 
(a) Echo average OFF
(b) Echo average ON
 
Effect of echo averaging