Saw: sbas almanac data, Reminder on how to output saw messages – Spectra Precision ProFlex 800 Reference Manual User Manual
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Data Output
SAW: SBAS Almanac Data
This message contains almanac data for one SBAS satellite.
The message is as follows:
$PASHR,SAW,
The message’s binary structure is described in the table
below.
Reminder on How
to Output SAW
Messages
Use the $PASHS,RAW command with the syntax below:
$PASHS,RAW,SAW,
For more details on the $PASHS,RAW command, refer to the
Set Command Library Chapter.
Type
Name
Size
Contents
char Id
1
Data
ID
char
Health
1
Satellite Health&Status bitwise meaning is:
Bit0 – Ranging On(0), Off(1)
Bit1 – Corrections On(0), Off(1)
Bit2 – Broadcast Integrity On(0), Off(1)
Bit3 – Reserved
Bit4-7 – SBAS provider ID (0-15):
0 – WAAS,
1 – EGNOS,
2 – MSAS,
3-13 – Not assigned yet,
14-15 – Reserved
long
T0
4
Almanac data reference time within the day
expressed in the SBAS time scale (seconds)
float
3*4
Satellite ECEF X,Y,Z coordinates (meters)
float
3*4
Satellite ECEF velocity X’, Y’, Z’ coordinates
(m/s)
long
Tow
4
Time within week in GPS time scale when
SBAS almanac was received
char
Wn
1
Week number in GPS time scale modulo 256
when SBAS almanac was received
char
Prn
1
Satellite number (33 to 51)
Unsigned short
Check-
sum
2
The checksum is computed by breaking the
structure into 18 unsigned shorts, adding them
together, and taking the least significant 16
bits of the result.
Total
38