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MiLLennium Command Descriptions Manual 3
Example:
log com1,posa,ontime,60,1
If the
LOG syntax does not include a trigger type, it will be output only once following execution of the LOG
command. If trigger type is specified in the LOG syntax, the log will continue to be output based on the trigger
specification. Specific logs can be disabled using the
UNLOG command, whereas all enabled logs will be disabled
by using the
UNLOGALL command (see Chapter 2 and Appendix C). All activated logs will be listed in the receiver
configuration status log (
RCCA).
The [port] parameter is optional. If [port] is not specified, [port] is defaulted to the port that the command was
received on.
COMMONLY USED LOGS
Other useful logs are
• RCCA to list the default command settings
• ETSA to monitor the channel tracking status
• SATA to observe the satellite specific data
• DOPA to monitor the dilution of precision of the current satellite constellation
• RVSA to monitor the receiver status
For further information on output logging see Chapter 4 and the individual logs listed alphabetically in Appendix
D.
Use the
HELP command to list all available commands. For more information on sending commands see Chapter
2 and the individual commands listed alphabetically in Appendix C.
1.3 DIFFERENTIAL OPERATION
GPSCard receivers are capable of operating as either a reference station or a rover station. This makes the
MiLLennium GPSCard ideal for design into DGPS systems.
The GPSCard is capable of utilizing various formats of differential corrections. These formats are divided into two
primary groups
RTCM and RTCA.
For detailed data structure concerning these logs, please see Chapters 4, 5, 6 and Appendix D.
Establish a Data Link
Operating the GPSCard with a DGPS system requires that the reference station broadcast differential correction
data messages to one or more rover receivers. As there are many methods by which this can be achieved, it is up
to you to establish an appropriate data link that best suits your user requirements.
Whatever data link is chosen, the operator of the reference station will want to ensure that the bit rate of data
transmission is suitable for the anticipated data link and remote users. Use the GPSCard COMn command to the
COM port default bit rate (default is 9600 bps, no parity, 8 data bits, 1 stop bit, no handshake, echo off).
Note that the GPSCard COMn_DTR and COMn_RTS commands are available for remote device keying (such as
a radio transmitter). These commands allow for flexible control of the DTR and RTS lines to be precisely timed
with log transmissions.
Type Logs Trigger
Positioning PRTKA/B
POSA/B
ontime or onmark
Post Processing RGEA/B/D
REPA/B, ALMA/B
ontime
onchanged
NMEA Position GPGLL
GPGGA
ontime or onmark