You can set the length of the trails. The length represents the time it takes for the trails to
fade out.
The clear trails option clears target trails from your radar panel temporarily. The trails start to
build up again unless you switch the function off.
Showing a target's past position
• Past positions: used to visualize the previous positions of a tracked target or an activated
AIS target
• Time: defines the length of time for which each target's past positions should be displayed
on the PPI
• Interval: defines the distance between each past position indicator
Warning: Trails build-up starts when exiting from the standby condition.
Trails or past position length will be reached only after the selected time
duration.
Possible target tracking errors
Some factors can generate tracking errors or make the radar image difficult to read, and
therefore reduce target detection capability:
• Sea, rain, snow and low clouds returns
• Radar Interference
• Sidelobe echoes
• Blind sectors
• Low signal to noise ratio and signal to clutter ratio
Warning: The speed and course of a radar target are obtained by
consecutive measurements of the echo position. The data is then filtered to
reach the required precision. This means, that every abrupt change of speed
and direction will be recognized with a certain delay to reach absolute
certainty that the target is moving in a different way. The confirmation delay
is about five scans and after that some additional time is needed to reach
the same data precision as from before the maneuver.
Sea, rain, snow and low clouds returns
Radar echoes in sea, rain or weather clutter areas may be masked by the clutter. The effects
of such errors appear as continuous big changes of the target course and speed vectors.
Sometimes the symbol of a target that has been acquired at high speed can slip away from
the real target position after a certain time, and this might generate the lost target alarm.
These errors can be avoided or at least minimized by proper manual adjustments of sea and
rain controls, or by selecting the automatic control option. For more details, see "Adjusting the
radar image" on page 27.
Radar interference
Other radars operating in the same frequency band can generate interference. Normally this
is seen on the radar screen as a series of spirals. When the interference falls on the tracked
target, it can cause a deformation of the size of the echo, and consequently a small error in
the target's course and speed values.
Adjustment option is available in the advanced menu. See "Rejecting radar interference" on page
55.
Second trace echo
A second trace echo is an echo received from a distant target, received after the following
pulse has been transmitted.
Second trace echoes are present only under abnormal atmospheric conditions, or in
condition of super-refraction.
36
Targets | R5000 Operator manual
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