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2–5
As the SART is approached the radar will nor-
mally detect the initial fast sweep of the SART so
that the double dots will appear. The range delay
of the first dot should be no more than 150 meters
beyond the SART position.
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3 Radar bandwidth
This is normally matched to the radar pulselength
and is usually switched with the range scale and
the associated pulselength. Narrow bandwidths of
3-5 MHz are used with long pulses on long range
and wide bandwidths of 10-25 MHz with short
pulses on short ranges.
Any radar bandwidth of less than 5 MHz will at-
tenuate the SART signal slightly, so it is prefer-
able to use a medium bandwidth to ensure
optimum detection of the SART. The Radar Op-
erating Manual should be consulted about the par-
ticular radar parameters and bandwidth selection.
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44
4 Radar side lobes
As the SART is approached, side lobes from the
radar antenna may show the SART responses as a
series of arcs or concentric ring. These can be re-
moved by the use of the anti-clutter sea control
although it may be operationally useful to observe
the side lobes as these will confirm that the SART
is near to the ship.
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5 Detuning the radar
To increase the visibility of the SART in clutter
conditions, the radar may be detuned to reduce
the clutter without reducing the SART response.
Radar with automatic frequency control may not
permit manual detune of the equipment. Care
should be taken in operating the radar detuned as
other wanted navigational and anti-collision in-
formation may be removed. The tuning should be
returned to normal operation as soon as possible.
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66
6 Gain
For maximum range SART detection the normal
maximum gain should be used.
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7 Anti-clutter sea control
For optimum range SART detection, this control
should be set to the minimum. Care should be
exercised as target in sea clutter may be obscured.
Some sets have automatic/manual anti-clutter sea
control facilities in which cases the operator
should switch to manual.
8 8
8 8
8 Anti-clutter rain control
This should not be used when trying to detect
SARTs as the SART responses may be removed
by this control.
Some sets have automatic/manual anti-clutter rain
control facilities in which case the operator should
switch to manual.
*
This information was created by CIRM and re-
viewed at NAV 39 and circulated as ANNEX 8
NAV 39/WP.2/Add.1.