distance is between the satellite and the receiver.
The difference this makes is shown on a 24 hour plot below. The un-aided GNSS is shown in
red
, while the RTK is
shown in
green
at the centre.
RTK versus un-aided GNSS
NTRIP Guidance
In order for some NTRIP Casters to work, they require your position. This is true if the service you are using has multiple
reference stations over a large area, in which case it will need to know which one is closest to you.
This is achieved by your GNSS engine sending a GGA NMEA message to the caster, which needs to be enabled on
your GNSS engine. This message can be set to transmit every 10 s, it is not necessary to send it more often than that.
Note that if the NTRIP service you are using requires a GGA message, and it is not sent, you will not receive any data. If
you are using your own Base Station, or a service with only one Base Station, then the GGA message is not needed.
NTRIP delivered RTCM v3 messages are usually sent once a second or once every two seconds. RTK can usually still
be accurate even if the message is up to 60 s old, but for best performance, keep this as short as possible.
https://en.racelogic.support//Product_Info/VBOX_Data_Loggers/VBOX_Sigma/VBOX_Sigma_User_Guide/01_-
_VBOX_Sigma_Introduction
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