SAM Electronics GmbH NG3028X25KW Benutzerhandbuch

ED 3038 G 232 / 01 (2002-06) 

b_r1_e33.fm / 21.06.02

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Achievable radar range

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Radial and azimuthal distortions of the radar video

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Influences of fog, rain, snow, hail 

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Reflections from the sea surface

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Disturbances caused by other radars

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False or indirect echo displays

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Sectors of reduced radar visibility

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Superrefraction - subrefraction

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Sector Blanking

The  theoretically achievable radar range limited by the curvature of the earth depends on the height
of the antenna above the water surface and the height of the target, and is applicable under normal
atmospheric conditions - see the following table.

Whether radar targets can be detected up to this theoretical range, even with optimum video setting,
depends not only on the atmospheric conditions but also on the characteristics of the target:

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Large targets with good reflection characteristics produce strong echo signals and are displayed with
corresponding clarity on the screen.

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Smaller targets situated in the shadow of large objects are not illuminated by the radar pulses and
are therefore not displayed.

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Flat coasts have an unfavourable reflection cross-section and cannot be recognized until they have
been approached more closely. On the other hand, high coastlines and mountainous regions further
inland are recognised at a very early stage.

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In the coastal approaches, the tide rip lines and surf areas are displayed similarly to coastlines.
However, this rather irritating display can be a valuable orientation aid for the coastal navigator.

9 NM

12 NM

13 NM

18 NM

28 NM

44 NM

76 NM

11 NM

13 NM

16 NM

21 NM

31 NM

47 NM

79 NM

12 NM

16 NM

19 NM

13 NM

34 NM

50 NM

82 NM