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Commands
4.2.4
ISMCALIBRATE Setup a TEC self-calibration
This command instructs the receiver to perform a self-calibration of TEC offsets for all enabled signal
combinations (see ISMSIGNALCONTROL). The calibration status and current calibrated TEC
offsets can be collected from the ISMCALIBRATIONSTATUS log. The Enable parameter controls
whether to start or abort a calibration.
The Start Delay parameter can be used to start calibration at a time of day when absolute ionospheric
TEC is at its lowest. In addition, scintillation activity must be low for the calibration to be successful.
The Duration field controls how long the calibration is performed.
The Elevation cutoff field sets an elevation mask so that only satellites above this elevation will be
used in the TEC calibration.
Due to the unpredictable nature of ionospheric activity, this command does not automatically set the
TEC calibration values in the receiver once the calibration is complete. The user must log the
ISMCALIBRATIONSTATUS message to examine the results of the calibration and then use the TEC
offset values reported in that log as input to the ISMTECCALIBRATION command.
Abbreviated ASCII Syntax:
ISMCALIBRATE enable [start_ delay] [duration] [elevation_cutoff]
Input Example:
ismcalibrate enable 0 21600 65
Field
Field Type
1
ISMCALIBRATE
Header
2
Option
3
Start offset
4
Duration
5
Elevation cutoff
GPStation-6 User Manual Rev 2
ASCII
Binary
Value
Value
-
-
This field contains the
command name or
the message header
depending on whether
the command is
abbreviated ASCII,
ASCII or binary,
respectively
Stop a TEC self-
Disable
0
calibration
Start a TEC self-
Enable
1
calibration
0 to
Seconds to delay
604800
calibration start
(Default = 0)
1 to
Calibration duration in
604800
seconds (Default =
21600)
-90 to
Elevation cutoff, in
90
degrees, for
calibration (Default =
65)
Binary
Description
Format
-
ENUM
ULONG
ULONG
FLOAT
Message ID: 1405
Binary
Binary
Bytes
Offset
H
0
4
H
4
H+4
4
H+8
4
H+12
50
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