USAGE OF TARGET TRACKING FUNCTION
z There are the following limitations on use of the target
acquisition and target tracking functions.
[I] Resolution between adjacent targets and swapping
during automatic target tracking
Depending on the particular distance and echo size,
resolution between adjacent targets during automatic target
tracking usually ranges somewhere between 0.03 to 0.05 NM.
If multiple targets approach each other, resolution will
become about 0.05 NM and this may cause the system to
regard them as one target and thus to swap them or lose part
of them. Such swapping or less of targets may also occur if
the picture of the target being tracked is affected by rain/snow
clutter returns or sea clutter returns or moves very close to
land.
[II] Intensity of echoes and the target tracking function
The intensity of echoes and the tracking function have a
correlationship, and thus the target will be lost if no echoes
are detected during six scans in succession. If a lost target
exists, therefore, radar gain must be increased to support
detection of the target. If, however, radar gain is increased
too significantly, sea clutter returns or other noise may be
erroneously detected and tracked as a target, and resultingly,
a false alarm may be issued.
[III] Adverse effects of error sources on automatic
tracking
To execute accurate tracking, it becomes necessary first to
appropriately adjust the [GAIN], [SEA] and [RAIN] dials of the
radar so that the target to be acquired and tracked id clearly
displayed on the radar display. Inappropriate settings of
these adjustments reduce the reliability / accuracy of
automatic tracking.
Attention
5-1
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