ashtech GG Surveyor, Reference Manual

Page: 64 / 256

46 GG Surveyor GPS+GLONASS Reference Manual
Do not try to transmit corrections on the same GG Surveyor serial port you are using to set up the
receiver from your PC.
The receiver is set as a base station which transmits RTCM message types 1 and 31
every second. Following a power cycle it automatically starts transmitting these
corrections 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 an RTK Base Station
You must have both the Base option [B] and the Phase Differential option [J]
installed on the receiver.
Send the commands listed in Table 5.2 to the receiver to generate RTCM RTK
message types 3,18,19 and 22.
$PASHS,RTC,BAS,x Turn on RTCM corrections on port x
When this command is sent, a base station
automatically sends RTCM message types 1 and
31 once per second.
$PASHS,RTC,SPD,9 Set internal bit-rate for corrections to burst
mode.
$PASHS,LPS,1,1,1 Set loop setting for stationary receiver.
$PASHS,SAV,Y Save settings
Table 5.2: RTK Base Station Commands
Command Description
$PASHS,RST Reset the receiver to factory defaults
$PASHS,ELM,4 Set the RTK Base mask to nine degrees
$PASHS,POS,ddmm.mmm,d,dddmm.mmm,d,saaaaa.aa Enter the phase center of the antenna
$PASHS,RTC,BAS,B Turn on RTCM corrections on port x
When this command is sent, a base station
automatically sends RTCM message types
1 and 31 once per second.
$PASHS,RTC,TYP,1,0 Turn off RTCM messasge type 1.
$PASHS,RTC,TYP,31,0 Turn off RTCM messasge type 31.
$PASHS,RTC,TYP,3,1 Turn on RTCM messasge type 3.
Table 5.1: Differential Base Station Commands (continued)
Command Description