Appendix B: Radar
145
Side lobes
Side lobe patterns are produced by small
amounts of energy from the transmitted
pulses that are radiated outside the
narrow main beam.
The effects of side lobes are most
noticeable with targets at short ranges
(normally below 3nm), and in particular
with larger objects. Side lobe echoes form
either arcs on the radar screen similar to
range rings, or a series of echoes forming
a broken arc.
Indirect echoes
There are several types of indirect echoes or ghost images. These sometimes have
the appearance of true echoes, but in general they are intermittent and poorly
defined.
True echo
Side echoes
Main lobe
Antenna
Arc
Side lobe
Side lobe
D7051_1
False echo
True echo
Passing
ship
True echo
False echo
Mast
or funnel
D7052_1
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