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Appendices
Test Bed Receiver Subsystem Addendum – Rev 1 31
IONOMODEL
This command allows the user to influence what ionospheric corrections the card uses. This command currently does not
effect the ionospheric model that is used when the card is operating in RTK mode. Additional range values are reserved
for future use.
The MiLLennium by default computes ionospheric corrections by attempting to use L1 & L2 signals first. To use the
ionospheric corrections issued by the WAAS GEO satellite as a first choice, you need to issue the IONOMODEL WAAS
command.
Syntax:
IONOMODEL
[keyword]
Syntax
Range Value
Description
IONOMODEL
-
Command
keyword
WAAS
L1L2
KLOBUCHAR
1
AUTO
Card will use ionospheric corrections from WAAS broadcast
messages as a first choice
You must verify that the CONFIG command is set to either
WF1L1L2 or WF2L1L2 for this command to work, see Page 30.
Card will use ionospheric corrections derived from L1 and L2 GPS
measurements as a first choice. Card must have L2 observations
in order for this setting to be effective.
Card will use ionospheric corrections as calculated by the
broadcast klobuchar model parameters as a first choice.
Card will decide which ionospheric corrections to use based on
availability. (default)
Note: You cannot change GPSCard modes on the fly because once a CONFIG command is issued, the card resets itself
and starts the new mode requested.
1
Please refer to ICD-GPS-200 for a description of the Klobuchar model and its parameters. To obtain copies of ICD-GPS-200
from the ARINC Research Corporation, contact them at the address given in Appendix F of the MiLLennium Command
Descriptions Manual.