False Echo By Secondary Reflection; False Echo By Multiple Reflection - JRC JMR-5406-X Instruction Manual

7.4.3

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 from the target and the other is the secondary reflection from a
mast or funnel that stands in the same direction as shown in the following Figure.
Radar
antenna
Funnel
7.4.4

False echo by multiple reflection

When there is a large structure or ship with a high vertical surface near own ship as shown in the
following Figure, multiple refection 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.
Section 7 True and False Echoes on Display
Direct microwave
Secondary reflection of
microwave
Example of false echo by secondary reflection
False Eco by Multiple Reflection
Actual target
7-8
False echo from
funnel