Simrad ARGUS FMCW 3G, User Manual

Page: 106 / 150

104 |
Tracking | Argus Radar Operator Manual
When Guard zone is chosen, any radar echo or AIS target received near the same position
for 3 consecutive scans within the area, will automatically be acquired and, in the alarm area,
the alarms “RADAR TRACKED TARGET AUTO ACQUIRED” and “TARGET IN GUARD ZONE” are
activated and the symbol is drawn in red color as a reversed triangle (only RADAR TARGET).
The main differences with the Auto Acquisition are:
1. The symbols change back into their original shape and color once they are out of the area
again.
2.
The alarm “TARGET IN GUARD ZONE” is given, even if the target has already previously been
acquired.
The system provides up to four Guard zones; when the “Guard Zone” button is pressed and the
related window is visualised, the default Guard Ring N°1 is visualised as well. The operator will,
by means of the button “Next >> GZ 1/2/3/4”, be able to select one of the other Guard zones.
Until they are in editing mode, they are drawn with a dashed line. The color of the line de-
pends on the type: green for Auto Acquisition and red for Guard. Once they are accepted, the
active ones are drawn with a standard line. The others are cancelled from the screen.
If a zone, during editing, overlaps an active zone, it will be flashing. And if the operator presses
the “Accept” button, the operation will be stopped and a warning saying “Sector Overlapping”
will appear in the Warnings and Wrong Orders section (“Alert and system failures” on page
129, 2nd column, yellow button).
The variable values are:
•
Front range
•
Bearing; the bisecting imaginary line of the sector is placed at the given value, relative to the
ship’s heading
• Sector width.
The procedures to activate and store the zones are the same as the Auto Acquisition zones.
The Guard Zones and Auto Acquisition Zones colors and visualisations are displayed in the
following table:
Zone Color Presentation
Guard zone Red
Activated: Continuous
Not activated: Dashed
Auto acquisition Green
Activated: Continuous
Not activated: Dashed
Superimposition Blanking Depending on the activation
¼
Note: It is not allowed to superimpose Guard Zone and Auto Acquisition Zone.
Trial manoeuvre
The Trial Manoeuvre is a radar target and AIS function which is composed by cinematic simu-
lations, provided as a rapid aid to evaluate collision risks as a result of possible course changes.