6-3
6.2 STRENGTH OF REFLECTION FROM
THE TARGET
The signal intensity reflected from a target depends not only on the height and size of the target but also on its
material and shape. The echo intensity from a higher and larger target is not always higher in general.
In particular, the echo from a coast line is affected by the geographic conditions of the coast.
If the coast has a very gentle slop, the echo from a mountain of the inland like Figure 6.3 appears on the radar
display.
Therefore, the distance to the coast line should be measured carefully.
Figure 6.3 Sea shore line not displayed on the radar display
Table 6.1 shows the relation between the target detection distance and the radar reflection cross-sectional area
(RCS) with regard to the type and the height of the target in a situation in which the weather is good, the sea state
is calm and the radio wave propagation is normal. As revealed by this table, even on the same sea shore line,
detection distance greatly differs depending on the height of the target from the surface of the sea. Furthermore,
because the target detection distance is greatly influenced by the shape and material of the target and
environmental conditions, such as the sea state, weather, and radio wave propagation, caution should be taken
when detecting distance of target.
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