Faro FOCUS3D X 130 User Manual page 110

GPS information - Provides information about the currently measured GPS
coordinates latitude, longitude and the altitude as well as the UTC time of the last
satellite contact and the number of satellites that are currently in view. The GPS
receiver needs the signal of at least three satellites to calculate a 2D position
(latitude and longitude). With four or more satellites in view, the receiver can
determine the scanner's 3D position (latitude, longitude and altitude).
The signal strength bars below the GPS information appear for each satellite in
view with the appropriate satellite number underneath. They indicate the signal
strength for each satellite.
GPS precision - Provides information about the precision of the currently
measured coordinates in metres or feet. The DOP (dilution of precision) values
are an indicator of the quality of the geometry of the current satellite
constellation. In general, good position measurements can be achieved, when the
satellites are located at wide angles relative to each other. In this case the DOP
values are low. Higher DOP values indicate a poor satellite geometry which
might have a negative effect on the position accuracy.
The current GPS status and signal quality is indicated by a different GPS icons in
the status bar of the operating software:
Before starting a scan, you should always have look at the GPS icon and the
indicated quality. If no GPS data is available or position deviation is high, try to
find a position with better signal quality.
No GPS
GPS is turned off
icon
GPS is enabled, position deviation in
meters > 30m or no GPS data available.
GPS is enabled, position deviation in
meters > 20m and <30m
GPS is enabled, position deviation in
meters > 10m and <20m
GPS is enabled, position deviation in
meters < 10m
Chapter 6: The Focus
®
FARO Laser Scanner Focus
102
3D
X 130 Manual
January 2014
3D
X 130 Controller Software