JRC JMA-5212-4/6 User Manual page 322

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