Novatel OM-20000041 Monitoring Your RTK Output Data , Options for Logging Differential Corrections

1 Quick Start
20 MiLLennium GPSCard Software Version 4.50 Command Descr iptions Manual Rev 1
Example: fix position 51.11358042,-114.04358013,1059.4105,119,0
log com1,rtcm3,ontime,10
log com1,rtcm59,ontime,2
2. At the remote station:
accept com n ,rtcm
Example: accept com2,rtcm
Congratulations! Your RT-20 system is now in operation!
Monitoring Your RTK Output Data
At the remote station, you could now select any or all of these output logs for positioning information:
• BSLA/B Baseline Measurement
• NMEA-format logs
• POSA/B Computed Position
• PRTKA/B Best Position
• RPSA/B Reference Station Position & Health
• RTKA/B RTK Output - Time Matched Positions
The POSA/B, PRTKA/B and NMEA-format logs contain the low-latency position; the RTKA/B logs contain the
matched position. The low-latency solution is th e recommended one for kinematic users, while the matched
solution is the one recommended for stationary users. For a discussion on low-latency and matched positions, see
the Differential Positioning section of Appendix A, Page 66.
Options for Logging Differential Corrections
SET DGPSTIMEOUT
The DGPSTIMEOUT command allows the reference station to set the delay by which it will inhibit utilization of new
ephemeris data in its differential corrections. This delay ensures that the remote receivers have had sufficient time
to collect updated ephemeris data as well.
A delay of 120 to 130 seconds will typically ensure that the rover stations have collected updated ephemeris. After
the delay period is passed, the reference station will begin using new ephemeris data. To enter an ephemeris delay
value, you must first enter a numeric placeholder in the DGPS delay field (e.g., 2). When operating as a reference
station, DGPS delay will be ignored (see the DGPSTIMEOUT command found in Chapter 2, Page 23 and Appendix
C, Page 90 for further information on using this command at rover stations.)
Syntax:
Example:
dgpstimeout 2,300
USING RTCM SC-104 LOG TYPES
DGPSTIMEOUT dgps delay ephem delay
Command Option Description Default
DGPSTIMEOUT Command
dgps delay min. 2
max. 1000 Maximum age in seconds 60
ephem delay min. 0
max. 600 Minimum time delay in seconds 120