ashtech GG Surveyor - Setting up a Combined Differential and RTK Base Station

Differential and RTK Operations 47
Differential and RTK
The receiver is set as a base station which transmits RTCM messages types 18 and 19
every second, and types 3 and 22 every minute. Following a power cycle it will
automatically start transmitting these messages again (because you have saved the
settings with the $PASHS,SAV,Y command). To change the message rate, use the
$PASHS,RTC,TYP command.
Setting Up a Combined Differential and RTK Base
Station
You must have both the Base option [B] and the Phase Differential option [J]
installed in your receiver.
Send the commands listed in Table 5.3 to the receiver.
$PASHS,RTC,TYP,18,1 Turn on RTCM messasge type 18.
$PASHS,RTC,TYP,19,1 Turn on RTCM messasge type 19.
$PASHS,RTC,TYP,22,1 Turn on RTCM messasge type 22.
$PASHS,RTC,SPD,9 Set internal bit-rate for corrections to burst
mode.
$PASHS,CPD,MOD,BAS Set receiver as RTK base station with
default settings: Type 18 and 19 messages
generated one per second. Type 3 and 22
messages generate once per minute. RTCM
data output on port B in burst mode.
$PASHS,LPS,1,1,1 Set loop setting for stationary receiver
$PASHS,SAV,Y Save settings
Table 5.3: Base Station Commands
Command Description
$PASHS,RST Reset the receiver to factory defaults
$PASHS,PEM,4 Set the Base differential mask to four degrees
$PASHS,ELM,4 Set the RTK base elevation mask to nine degrees
$PASHS,POS,ddmm.mmm,d,dddmm.mmm,d,saaaaa.aa Enter the phase center of the antenna
$PASHS,RTC,BAS,x Turn on RTCM corrections on port x
$PASHS,RTC,SPD,9 Set internal bit-rate for corrections to burst mode
Table 5.2: RTK Base Station Commands (continued)
Command Description