Simrad ARGUS FMCW 3G, Руководство пользователя

Страница: 40 / 150

38 |
Basic operation | Argus Radar Operator Manual
•
Manual Speed, which is not allowed if using AIS on board.
•
Auto Drift, which is not allowed if using AIS on board.
•
EPFS Speed.
The speed source selected is indicated by the green “√” tick on the yellow background.
Furthermore, it is possible to set a Manual Drift speed and angle, but only with: Manual Speed;
Single Axis Speed Log or Dual Axis Speed Log with transversal has no speeds available.
Main Menu Control – Speed Source Selection Menu
Log speed
The speed LOG can be Single or Dual axis input, either water track or bottom track. Therefore
the stabilization mode available can be either Sea or Ground depending on the sensor in use.
¼
Note:
The speed through water measured close to the hull is affected by the tide and by the
current, so from time to time it will differ significantly from speed over the ground. A Speed
Log measuring speed through water may in specific cases be affected by poor conditions
due to e.g. air or ice below the sensor. If the sensor measures only the longitudinal compo-
nent of the speed, the transversal ship component is unknown to the radar.
Manual speed
Selecting Manual Speed, the value written in the label next to the Manual Speed switch but-
ton will be applied as ship speed; this value can be changed placing the cursor on the above
mentioned label and following the suggestion of the Help line, which will say “Decrease”,
“Enter Value” and “Increase”, then press the left or right SK to decrease or increase the actual
value or press the centre SK to directly enter a new value using the numeric keypad, which is
the same as for the Gyro preset.
¼
Note:
The Manual Speed is an evaluated speed, unsettled and inaccurate; for this reason,
some operations cannot be performed with manual speed. This can be for True Vector pre-
sentation and if on-board AIS is ON.
Auto drift speed
The Auto Drift Speed can be selected to compute own ship’s speed (in case of speed log
failure) using as reference a stationary target. Selecting the Auto Drift Speed, the system will
calculate the ship’s speed relative to the reference target. The Ref. Target can be set by press-
ing the “Ref Target Sel” labelled button when the interesting target is the last selected (the one
in the first column of the target data window) which can be called Reference Target and be
recognized by a square flashing around it and an “R” inside the square at the top right corner.
Obviously, the reference target must not be moving, otherwise the speed computed is the
sum of the two speeds of own ship and the reference target, and the radar target track must
be steady (must be tracked for at least 3 minutes).
The procedure for using the Auto Drift should be as follows:
1.
Acquire a complete stationary echo (e.g. a buoy).
2.
Wait about 3 minutes, until its symbol changes from to .
3.
Select it and press “Ref Target Sel” and the symbol will change to with a flashing
square around (selection).