User's Manual

Synapsis Radar
with Nautoscan NX Pedestal
Operator Manual
Edition Sep 2015
3-9
4265.DOC020102
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 displayed 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 (Figure 3-6).
These echoes can easily be identified because these echoes can be reduced
by adjustment of GAIN, SEA controls.
Figure 3-6 Side lobe and multiple reception false echoes
Side
lobe
Side
lobe
Side lobe effects
D
A
E
B
C
A
Multiple reception
Main lobe