JRC JMA-5312-6 Instruction Manual page 325

6.3 Sea Clutter and Rain and Snow Clutter
[III] Coping with sea clutter and rain and snow clutter
When the weather is bad and the ocean is rough, the use of an S band radar is effective because the
radar is not influenced by sea clutter so much and attenuation due to rain drops is small. When an X
band radar is used, reducing the pulse width will reduce the influence by spurious waves, and also the
spurious wave rejection function effectively works; therefore, the use of short pulse is effective when
the weather is bad. By using image processing functions PROC 1 to 3, it is expected that spurious
waves are further suppressed. Since optimal settings for those items can be automatically made by
using the function mode, it is recommended that FUNC Storm or FUNC Rain be used by
selecting the function mode when the weather is bad. For details of the function mode, see Chapter
3.9.
However, these functions may make some targets invisible, particularly targets with higher speeds.
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