GNSS diagnostics 11 īīDiagnostics / troubleshooting
Condition Explanation
Multipath environment Multipath errors are caused when GNSS signals are reflected off nearby
objects and reach the receiver by two or more different paths.
RTK Base station
coordinate accuracy
For RTK positioning, it is important to know the base station coordinates
accurately. Any error in the position of the base station affects the
position of the rover; every 10 m of error in a base station coordinate
can introduce up to 1 ppm scale error on every measured baseline. For
example, an error of 10 m in the base station position produces an error
of 10 mm over a 10 km baseline to the rover.
For more information about how to make sure the position of your base
station is accurate, refer to the manual for your base station receiver.
Multiple RTK base
stations
If you are using several base stations to provide RTK corrections to a
large site area, all base stations must be coordinated relative to one
another. If they are not, the absolute positions at the rover will be in
error.
For more information about how to use several base stations to cover
your site, contact your local Trimble Reseller.
Poor accuracy (multipath)
Poor accuracy can be due to GNSS signals reflecting off nearby trees and/or metal buildings and
horizontal surfaces. (Reflection is also called multipath.)
To reduce multipath noise, mount the GNSS receiver so that it has a clear view of the sky. The
receiver must be away from trees and large metal objects.
Intermittent loss of lock on satellite
l The receiver loses the satellite signal from time to time: Make sure that the receiver is mounted
on the highest point of the vehicle and is clear of metal surfaces.
l Signal takes a long time to initialize
l
l In RTK mode, longer baselines require longer initialization times. (The baseline is the
distance between the base receiver and the rover receivers.)
l Wait for the receiver to initialize or consider repositioning the base receiver to shorten the
baseline. Make sure the rover receiver is in a clear area.
Loss of initialization
In RTK mode initialization can be lost when the rover receiver is close to trees or buildings and the
number of satellites falls below four. Additionally, initialization may be lost if the receiver has not
Version 1.075, Revision C TMX-2050 Display User Guide 319
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