User's Manual Part 2

Operator Manual
3−8
3748DOC020102 Edition: 14.JAN.2005
3.2.1.3 Side Lobe Effect
In short ranges, not only the main lobe of the radar is reflected by ships nearby
but in some cases also the side lobes are reflected.
This leads to false echoes, which are all at same distance, but different bearings.
Multiple reception effect
If a strong echo reflected from a large object at short range is
reflected several times between the object and own ship, false echoes are dis-
played at positions of 1, 2, 3 or more times the distance of the actual position. A
is the actual echo, B and C are false echoes, and D and E are side lobe echoes
(see Figure: 3−5). These echoes can easily be identified because these echoes
can be reduced by adjustment of GAIN, SEA controls.
D
A
E
Figure: 3−5 Side Lobe and Multiple Reception False
Echo
main lobe
side
lobe
side
lobe
side lobe effects
B
A
C
multiple reception