Spectra Precision ProMark 800 Reference Manual - Manual (Page 409)

397
Output Message Library
Reminder on How
to Output SAL
Messages
Use the $PASHS,RAW command with the syntax below:
$PASHS,RAW,SAL,,ON,
For more details on the $PASHS,RAW command, refer to the
Set Command Library Chapter.
As an example, the command below will output SAL
messages on port A at a rate of 15 seconds:
$PASHS,RAW,SAL,A,ON,15
SAG: GLONASS Almanac Data
This message contains almanac data for one GLONASS
satellite.
The message is as follows:
$PASHR,SAG,
The message’s binary structure is described in the table
below.
Float Af1 4 Clock correction (sec/sec)
Short wna 2 Almanac week number
Short wn 2 GPS week number
Long 4 Seconds of GPS week
Unsigned
short Check-
sum
2
The checksum is computed by breaking the
structure into 34 unsigned shorts, adding them
together, and taking the least significant 16 bits
of the result.
Total 70
Type Name Size Contents
Type Name Size Contents
Short prn 2 Satellite number 1-24
Short frq 2
Satellite GLONASS frequency number
[-7,…,6]
Short health 2 Satellite health 0=bad, 1=good
Float e 4 Eccentricity
Long 4
Reference day number (days in range 1 to
1461)
Float 4 Correction to inclination (semicircles)
Float w0 4
Longitude of first ascending node (semicir-
cles)