Manual Standard Horizon MDS-10-5 (page 31 of 38) (English)

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Radar Installation Manual Page 33

create a shdow zone behind it and prevent you from seeing targets on the other side. More

importantly, if a mast or some part of the boat’s superstructure is in the path of the antenna’s

sweep, this will also create a shadow zone. No targets will be recognized behind it and it

could create a dangerous situation.

A.1.2 False echoes

Sometimes radar will display targets on screen that do not exist in the real world. You should

be aware of how and why this happens.

Ghost echoes

Sometimes one large object very near your boat will appear as two different targets on

screen. One is the actual radar echo. The other is a ghost echo generated by a re-reflection

of the original signal. It comes back to your own boat, bounces back to the target, and then

is picked up by the antenna on the second bounce. The actual echo appears at the correct

distance and bearing on the screen. The ghost echo appears somewhere behind your boat.

This type of false echo is also generated by re-reflection of waves from bridges, break walls

or building along shore.

Target

Direct

reflection path

Secondary

reflection path

Mast etc.

Real echo

Ghost echo

Direction of ghost echo

Figure A.1.2 - Ghost Echoes

Multiple echoes

If there is a large vertical reflecting surface near your boat, as in the case when you pass

alongside a large ship, radar signals are repeatedly bounced back and forth between your

boat and the other object. Two to four images appear on the screen at equal intervals in the

same bearing. This is called a multiple echo. The image appearing closest to you is the real

echo. Multiple echoes will disappear as you move away from the reflecting object or its

bearing changes.

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Standard Horizon MDS-10-5 Manual

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