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Measurement | Argus Radar Operator Manual
Measurement
Radar echo measurement
The position, speed, course, distance and bearing of radar echoes can be performed in several
ways:
•
Measurement by means of range rings and bearing scale
•
Measurement by means of the cursor
•
Measurement by means of the ERBL 1 or 2.
The following table shows the advantages and disadvantages for each of the above measure-
ment modes.
Measurement mode Advantages Disadvantages
Range rings and bearing scale Fast measurement Very low accuracy
Cursor
Precise measurement
Fast measurement
Changing the scale, the
cursor remains on the same
physical position on the PPI,
changing the information
ERBL
Precise measurement
Changing the scale, the
cursor remains on the same
distance
The operator does not get a
fast measurement
Measurement by means of range rings and bearing scale
The measurement by range rings and bearing scale is used when it is not necessary to have
an accurate value
, but it is sufficient to have an approximate one very quickly.
Measurement by means of the cursor
Placing the trackball cursor over the echo, very low accuracy in the cursor area (See “System
data area sections” on page 23, Cursor and Markers section, first row) will display the range
and bearing to the cursor.
If the system is connected to a position source (i.e. GPS), this measurement mode will also
indicate the geographic position of the echo right under the range and bearing (See “System
data area sections” on page 23, Curser and Markers section, 2nd and 3rd row).
Measurement by means of the ERBL 1 or 2
In order to measure the bearing and range to a target by means of one of the two available
ERBL, the operator need to:
•
Turn ON one of the two ERBL, 1 or 2, by pressing the correspondent pushbutton on the key-
board or by activating the ERBL using the shortcuts on the row under the PPI area
•
Drag the EBL or VRM (or both), using the centre SK (keeping it pressed) until the trackball
marker is over the target. PPI mode is automatically selected turning ON the ERBL
• Release the SK and read the values next to the ERBL area.
The readings are the bearing and range to the echo.
Dragging the VRM is only possible in PPI mode, place the trackball cursor over one point of
the circle, press the centre SK and move the trackball keeping the SK pressed until the circle is
at the desired distance.
Dragging the EBL is only possible in PPI mode, place the trackball cursor over one point of the
line, press the centre SK and move the trackball keeping the SK pressed until the line is placed
at the desired angle.
Dragging both of them simultaneously is only possible in PPI mode, place the trackball cursor
over the point of intersection between the circle and the line, press the centre SK and move
the trackball keeping the SK pressed until the intersection is placed at the desired position.
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