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Watch the quality indicator, correction age, and reference station ID number in the
GPGGA message for RTK performance. The quality indicator will be 4 when RTK is
working properly. The quality indicator will be 2 when in L-DIF mode. You should
check the correction age to ensure the radio modem link is receiving corrections
consistently. If it is 1 then no corrections have come through and you should ensure
the baud rates are correct at the rover GPS receiver, rover radio modem, base radio
modem, and base GPS receiver. The correction age should be 1, representing 1
second of delay since the last correction was received – this should be steady at 1 if
your radio modem link is working properly. If it starts counting up, your link is not stable.
The reference station ID number will indicate the identification number of the base
station that is being used. If it is blank, then you likely have not received any corrections
yet and you should check the radio link.
Watch the standard deviations of latitude, longitude, and height from the GPGST
message to determine positioning accuracy. They are in meters. Under proper RTK
operation, the values should be around 0.010m, representing centimeter level accuracy.
NOTES ON RTK ROVER OPERATION:
Your Hemisphere GNSS RTK rover receiver can provide information about the base station.
Issue $JRTK,17 to see the latitude, longitude, and height, of the base station. You can also
display the distance to the base station (in meters) by issuing the $JRTK,18 command.
FURTHER INFORMATION:
Consult
www.HemisphereGNSS.com
For support via email, please contact
This document is provided for technical support purposes only. Please refer to the product documentation for
warranty, license and safety information associated with the product.
Hemisphere GPS
RTK Rover Workflow for Crescent Based Receivers p/n 874-0004-000
for the latest information, or contact your dealer.
TechSupport@HemisphereGNSS.com
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