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6.2 Stren
th of Reflection from the Ta
et
Table 6.1 Relation between type and height of target and detection distance and RCS
Detection distance (NM) RCS (m²)
Type of target
Height from
sea surface
(m)
X band S band X band S band
Sea shore line 60 20 20 50,000 50,000
Sea shore line 6 8 8 5000 5000
Sea shore line 3 6 6 2500 2500
SOLAS target ship (>5000GT) 10 11 11 50,000 30,000
SOLAS target ship (>500GT) 5 8 8 1800 1000
Small boat with IMO standard
compatible radar reflector
4 5.0 3.7 7.5 0.5
Marine buoy with corner reflector 3.5 4.9 3.6 10 1
Standard marine buoy 3.5 4.6 3.0 5 0.5
10-meter small boat without radar
reflector
2 3.4 3.0 2.5 1.4
Waterway location beacon 1 2.0 1.0 1 0.1
Caution:
Detection distance shown in the above table may greatly decrease depending on the shape of
6
the target, sea state, weather and radio wave propagation conditions.
6-4
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