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Do not change the preset gate size carelessly. If the gate value is
improper, the ARPA acquisition and tracking functions may
deteriorate.
Otherwise, this may cause accidents to occur.
CAUTION
Gate Size・・・・・・・・・・・・・・・・・・・・・・・・・・・・・・・・・・・・・・・・・・・・・・・・・
The Gate Size is defined as an“Area Within which targets are watched by the ARPA”processing
circuit.
If the gate size is too large, targets are not lost but may be swapped with other close targets.
If the gate size is too small, targets are not easily swapped, but may be lost.
The ARPA processing circuit is designed to detect target sizes and set an accurate gate size
depENTing on the ranges and sizes of those targets (NARROW is the standard size). However,
change the setting parameters to select the best size in the following conditions:
Set 2.NARROW in normal operation.
When acquiring and tracking targets that spread widely in the angular direction
(The angular direction of the gate aperture is important)・・・・・・・・・・・・・・・・・・・・・・1.WIDE
When many targets are densely congested and swapped within 3NM in a port
(The gate size should be reduced)・・・・・・・・・・・・・・・・・・・・・・・・・・・・・・・・・・・・・・・・・・3.SMALL
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