Leica Geosystems GPS System 500 - Technical Reference Manual - Manual (Page 133)

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5. Configuring the Receiver Technical Reference Manual-4.0.0en
A complete description of all available
devices and detailed configurations
and uses is given in Appendix H.
Press CONT (F1) to return to the
CONFIGURE\Real-Time screen.
Press CONT (F1) again. The next
screen will depend on the device that
has just been chosen. For example, if
the chosen device is the Pacific Crest
radio, the user will be able to choose
the radio channel. If the chosen
device is a GSM device, the user will
be able to configure parameters for
use with a GSM device such as PIN
code.
A complete description of the different
screens is given in Appendix H.
Press SHIFT and then PRED (F3) to
activate and deactivate Prediction on
the rover.
If an SR530 is being used as the RTK
reference station, then the Leica data
format should always be used. In this
case Prediction should always be set
to YES.
If however, the reference is
transmitting a 3rd party data format
such as RTCM, CMR or CRM+, then
prediction on the rover may be turned
on or off. Prediction is only of use in
RTK cm accuracy surveys.
The default setting is that prediction
will be activated.
There are two advantages in using
prediction:
1. Update rate: Prediction allows RT
positions to be computed on the rover
at a rate greater than the
transmission rate of the data from the
reference station. This means RT
positions can be computed on the
rover at a rate up to 10Hz, regardless
of the rate at which data is
transmitted from the reference
station.
2. Reduced latency: Positions
computed with prediction will have a
latency of around 30 to 40ms.
However, should the RTK messages
transmitted from the reference station
be effected by latency, then the
accuracy of the positions computed
using prediction may be reduced. In
these circumstances, it may be
necessary to deactivate positions
computed by prediction. In this case
Prediction should be set to NO.