Sal: Enable/Disable Gps Satellite Almanac Message - ashtech GG Surveyor Reference Manual

SAL: Enable/Disable GPS Satellite Almanac Message

$PASHS,RAW,SAL,x,s
Enable/disable GPS almanac data (SAL) messages on port x, where x is the output
port, and s is ON or OFF.
Example: Disable SAL message on port A
Almanac data for all satellites is output once every hour, with one satellite output at each recording
interval (RCI).
$PASHQ,SAL,x,
The associated query command is $PASHQ,SAL,x. This command outputs the SAG
almanac data response message on port x, where x is the optional output port.
$PASHR,SAL
The response is a binary message in the form:
where Table 6.38 defines the measurement structure.
Field
short prn
short health
float
long
float
float
double
double
double
double
float
float
short
Command/Response Formats
$PASHS,RAW,SAL,A,OFF<Enter>
$PASHR,SAL,(almanac structure)
Table 6.38: SAL (Almanac) Structure
Bytes
2 Satellite PRN number [0,...,31]
2 Satellite health.
4 e eccentricity
4 toa reference time for orbit (sec).
4 i0 inclination angle (semicircles)
4 omegadot rate of right ascension (semicircles/sec)
8 roota Square root of semi-major axis (meters 1/2)
8 omega0 longitude of ascending node (semicircles)
8 omega augment of perigee (semicircles)
8 m0 mean anomaly at reference time (semicircles)
4 af0 clock correction (sec)
4 af1 clock correction (sec/sec)
2 wna almanac week number
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