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If your bandwidth limits the number of satellites for which you can transmit base
station data, then you may raise the mask angle. On baselines less than 100 km, the
remote station sees satellites at approximately the same elevation angles as the base
station sees them, the base station mask angle should be set one degree lower than the
remote mask angle. On long baselines the elevation angle changes by approximately
1° for every 100 km. So for baselines of x*100 km the base station should not have a
mask angle higher than the remote station mask minus x*1°.
The two different controls allow you, for a combined RTK/Differential base station,
to set the mask angles higher for RTK (which typically operates on short baselines)
than Differential (which often operates on longer baselines).
Base Station Position
The RTCM messages 3 and 22 broadcast the base station position. The base station
position may also be entered directly into the remote unit, using the
$PASHS,CPD,POS and $PASHS,UBP commands. This reduces bandwidth
requirements by obviating the need for messages 3 and 22.
Base Station Antenna Offset
If you set up the base station antenna over a known, surveyed point, you may enter the
position of the surveyed point and the offset from this point to the antenna phase
center. Or you may enter the phase center directly.
If you are using 3 & 22:
If you are entering the base station position directly at the remote:
Using Reference Station ID
You may monitor which reference or base station the remote receiver uses by setting
a reference station ID at the base station. Set the reference station ID using the
command $PASHS,RTC,STI.
You may also control which reference station the remote receiver uses by setting the
desired station ID at the remote receiver, or all the remote receiver to use corrections
from any base station.
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•
At the base station, enter the phase center of the antenna directly using
$PASHS,POS or
•
At the base station, enter the surveyed reference point using
$PASHS,POS and enter the antenna offset using $PASHS,ANT.
•
At the remote, enter the phase center of the base station antenna directly
using $PASHS,CPD,POS or
•
At the remote, enter the surveyed base station reference point using
$PASHS,CPD,POS and enter the base station antenna offset using
$PASHS,CPD,ANT.
GG Surveyor GPS+GLONASS Reference Manual
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