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False Echoes
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[
22
] Side Lobe Effect
A broken-line circular arc may appear at the same range as the main lobe of the radar beam on the radar
display. This type of false echo can easily be discriminated when a target echo appears isolated. (See
Fig.6.3)
Fig.6.3
[
33
] False Echo by Secondary Reflection
When a target exists near own ship, two echoes from the single target may appear on the radar display.
One of those echoes is the direct echo return from the target and the other is the secondary reflection
return from a mast or funnel that stands in the same direction as shown in Fig.6.4.
Fig.6.4
[
44
] False Echo by Multiple Reflection
When there is a large structure or ship with a high vertical surface near own ship as shown in Fig.6.5,
multiple reflection returns may appear on the radar display. These echoes appear in the same intervals,
of which the nearest echo is the true echo of the target.
Fig.6.5
HL
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