ashtech DG16 Reference Manual page 146

$PASHQ,ION,[c1]
This command queries the current ionospheric data generated by the GPS
satellites, where c1 is the optional port designator for the output of the response. If
a port is not specified, the receiver sends the response to the current port.
Ionospheric and tropospheric modelling are enabled when the receiver is functioning in stand-
alone mode (autonomous mode), but are disabled if the receiver is set as an RTCM base or rover,
since differential corrections already compensate for ionospheric and tropospheric delays.
$PASHR,ION
The response message is output in binary format:
$PASHR,ION,<Binary Data String + Checksum>
Table 6.27 describes the elements in the binary data string:
Type
float
float
float
float
float
float
float
float
double
double
unsigned long
short
short
short
short
short
short
126
Table 6.27. $PASHR,ION Format
Size
a
4 ionospheric parameter (seconds)
0
4 a ionospheric parameter (sec. per semicircle)
1
a
4 ionospheric parameter (sec. per semicircle)
2
a
4 ionospheric parameter (sec. per semicircle)
3
4 b ionospheric parameter (seconds)
0
4 b ionospheric parameter (sec. per semicircle)
1
b
4 ionospheric parameter (sec. per semicircle)
2
b
4 ionospheric parameter (sec. per semicircle)
3
8 A Constant term of GPS/UTC polynomial
0
8 A Constant term of GPS/UTC polynomial
1
4 t Reference time
ot
2 W reference week
nt
Dt
2 Delta UTC-GPS time at reference time
LS
2 WN Week of leap second correction
LSF
2 DN day of leap second correction
Dt
2 Delta time between GPS and UTC
LSF
2 WN Current GPS week number
DG14 and DG16 Board & Sensor Reference Manual
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