Leica GS50 User Manual page 20

3.3.2 QuickStart Tutorial - GIS Data Collection, contd.
Next to this symbol you'll find the
"Number of Satellites used on L1
and L2 ". The number indicates the
currently tracked satellites on L1 and
L2. Note that only the GS50+ will
show tracking on L2 because of its
dual frequency capability. On initial
start-up, this number will read 0
since it takes about 30 seconds to
start tracking satellites.
Both "Number of visible satellites"
and "Number of satellites used"
icons will change from time to time,
reflecting changes in the satellite
geometry due to either the rise of
new satellites or the setting of
descending satellites.
Getting Started With New Equipment
Position Fix Indication
The GS50 / GS50+ sensor will
compute a 2D-position once 3
satellites are tracked. A 3-D position
will be computed once a minimum of
4 satellites are tracked.
Note that for certain reasons 2D
navigation can become disabled with
the configuration. Please check the
Technical reference for more infor-
mation.
If the accuracy icon does
not become visible even
after one or two minutes then the
sensor is still not tracking satellites.
One cause for this is the receiver
receiving signals at a location more
than 500km from the startup posi-
tion. If this is the case, then the
receiver will download a new alma-
nac. This will take about 15 minutes.
Another cause for the receiver not
tracking is a faulty antenna cable
connection. Please check whether
20
the antenna cable is connected
properly to both the sensor and
antenna.
If you're in an open area
with no obstructions, the
"number of satellites used" should
correspond to the "number of visible
satellites". However, in obstructed
areas, such as urban canyons or
forested areas, it is unlikely that the
receiver will be able to track all the
satellites in the sky. This is not a
problem, but will degrade the accu-
racy of measurements slightly.
Consequently, please keep monitor-
ing the accuracy icon.
If you are getting no position
at all, check if the DOP Filter
in the configuration setting is
configured to a small value.
Once the Accuracy Status icon
appears, data collection can begin.
GS50 / GS50+-4.0.0en