Leica Geosystems GPS System 500 Equipment - User Manual - Manual (Page 13)

13
GPS Equipment User Manual - 4.0.0en
Getting started with the new Survey equipment
Measuring with the default configuration, continued
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.
Once a minimum of 4 satellites is
tracked the sensor can start comput-
ing a position. As soon as a position
is available it will be indicated by an
icon on the far left of the status line.
Since for postprocessing surveys no
realtime link will be used, the icon will
always indicate the availability of an
autonomous position (navigated
position) with an accuracy of about
10 meters (with Selective Availability
switched off).
As soon as the Position Mode icon
becomes visible the sensor is in a
stage where practical operation can
commence.
If the Position Mode icon does not
become visible even after one or two
minutes then the sensor is still not
tracking satellites. If the Number of
satellites used is still zero, please
check whether the antenna cable is
connected properly to both the
sensor and the antenna.
If the Number of satellites used
differs from the Number of visible
satellites make sure you place the
antenna in an open area without
obstructions, since any obstacle will
block the view of satellites.
Upon power on you will first recog-
nize the Number of visible Satel-
lites icon, indicating the number of
satellites which are theoretically
visible at the current location and
time. Usually this number varies
between 4 and 9, depending on the
satellite geometry and elevation
mask.
Next to this symbol you find the
Number of Satellites used on L1 /
L2 icon, indicating the number of
satellites currently tracked either on
L1 or on L2.
Upon power on you will read L1: 0,
L2: 0. It will take about 30 seconds
for these numbers to start changing
until they reach the number of satel-
lites visible.