M e r i d i a n I I U s e r M a n u a l
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C H A P T E R E L E V E N
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M e r i d i a n I I U s e r M a n u a l
R E A L - T I M E I O N O S P H E R I C C O R R E C T I O N S ( R T I C )
RTIC Configuration and Status Using the Network or Serial Port
The commands listed below allow you to get the current RTIC status and turn RTIC on or off.
ionostat
This command shows parameters associated with the RTIC Option. The string contains several pa-
rameters in the format shown below:
YYYYMMDD.HH:MM:SS K.KKKe-KK V +S.SSSe-SS
where:
YYYYMMDD.HH:MM:SS is the timestamp of the data.
K.KKKe-KK is the standard broadcast Klobuchar model ensemble ionospheric delay in seconds.
V is the validity of the Real-Time ionospheric delay calculations, T(rue) or F(alse).
+S.SSSe-SS is the Real-Time ensemble ionospheric delay calculation in seconds.
Here is an example:
Command:
ionostat
MeridianII reply:
20160916.18:13:10 1.093e-08 F +1.093e-08
rticmode
This command shows the operating state of the Real-Time Ionospheric Correction Option. It is either
OFF or ON. When ON, Real-Time ionospheric delays are calculated and used to compensate for the
GPS signal delay through the ionosphere. When OFF, the Real-Time delays continue to be calculated
but the standard broadcast Klobuchar ionospheric model delays are used to compensate for the GPS
signal delay through the ionosphere.
Command:
rticmode
MeridianII reply:
ON
setrticmode
This command allows the root user to manually set the Real-Time Ionospheric Correction Option
mode to either OFF or ON. For the highest accuracy and stability at a static location with good
satellite visibility, this should be set to ON. Even if this setting is ON, it will be ignored if the GPS
Dynamic mode is also ON, and real-time ionospheric delays will not be calculated. Factory default
mode is ON.
NOTE: The Real-Time Ionospheric Correction Option requires a minimum of 24 hours of operation
after lock to GPS to begin producing enhanced accuracy ionospheric delay calculations, and these
will reach their full accuracy after several days.
It accepts one command line argument: either ON or OFF. Use the
rticmode
command to confirm
any change in setting.
Command:
setrticmode ON
MeridianII reply:
Real-Time Ionospheric Corrections Mode is ON
Summary of Contents for Meridian II
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