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-3.5-
Summary to detect SART response
1. Use range scale of 6 or 12 nm as the spacing between the SART responses is about 0.6 nm
(1125 m) to distinguish the SART.
2. Turn off the automatic clutter suppression.
3. Turn off the Interference Rejector.
4. Turn off the Echo Average.
General remarks on receiving SART
Radar range scale
When looking for a SART it is preferable to use either the 6 or 12 nautical mile range scale.
This is because the total displayed length of the SART response of 12 (or 24) dots may extend
approximately 9.5 nautical miles beyond the position of the SART and it is necessary to see a
number of response dots to distinguish the SART from other responses.
SART range errors
When responses from only the 12 low frequency sweeps are visible (when the SART is at a
range greater than about 1 nm), the position at which the first dot is displayed may be as mush
as 0.64 nm beyond the true position of the SART. When the range closes so that the fast
sweep responses are seen also, the first of these will be no more than 150 meters beyond the
true position.
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 scales and wide bandwidths of 10-25 MHz with short pulses on short ranges.
A radar bandwidth of less than 5 MHz will attenuate the SART signal slightly, so it is
preferable to use a medium bandwidth to ensure optimum detection of the SART.
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 rings. These can be removed by the use of the anti-clutter sea
control although it may be operationally useful to observe the side lobes as they may be easier
to detect in clutter conditions and also they will confirm that the SART is near to own ship.