Rain Clutter; Controlling Video Processing - Furuno FEA-2107 Operator's Manual

22. Radar Overlay
22.4.4

Rain clutter

The rain clutter control removes rain clutter from the radar echo image.
When you adjust the rain clutter, "Noise" is automatically switched ON in order to display low-level radar images.
If you have radar overlay video through LAN from FAR-2x07 radar, use control of rain clutter on radar.
22.4.5

Controlling video processing

Echo average:
You can turn echo averaging on or off. Scan-to-scan correlation averages echoes over successive picture frames to
distinguish real target echoes from sea clutter. The choices are EAV1, EAV2, EAV3 and OFF.
EAV1: Helps distinguish targets from sea clutter and suppress brilliance of unstable echoes.
EAV2: Distinguishes small stationary targets such as navigation buoys.
EAV3: Stably displays distant target.
Interference rejector:
The interference rejector suppresses mutual radar interference which may occur in the vicinity of another shipborne
radar operating in the same frequency band. Three options are available: OFF, IR1 and IR2. Choose suitable level to
reduce interference from other radars. Choose OFF when no noise exists, so as not to miss weak targets.
Echo stretch:
Echo stretch emphasizes radar echo to increase detectability of targets. "LOW" emphasise both noise and target
level echoes while "HIGH" emphasizes only target level echoes.
Echo stretch HIGH
Clean:
Removes noise from the screen. Choose LOW or HIGH according to amount of noise. Choose OFF when no noise
exists.
22-6
Echo stretch OFF