Specifications
Command/Response Formats 143
Commands
$PASHR,ALM
The response is a binary message in the form:.
$PASHR,ALM,(almanac structure) <enter>
This message only exists in binary format. If ASCII format is requested (default), only the header
will be sent ($PASHR, ALM).
The almanac structure is defined in Table 6.76.
Table 6.76: ALM Message Structure
Type Size Contents
short 2 (Satellite PRN -1)
short 2 Health. see ICD-200 for description
float 4 e. Eccentricity
long 4 toe. Reference time for orbit (sec)
float 4 I0. Inclination angle at reference time (semi-circles).
float 4 OMEGADOT. Rate of right Asc. (semi-circles per sec).
double 8 (A)1/2. Square root of semi-major axis (meters 1/2).
double 8 (OMEGA)0. Lon of Asc. node (semi-circles).
double 8
ω. Argument of Perigee (semi-circles)
double 8 M0. Mean anomaly at reference time (semi-circle).
float 4 af0. sec
float 4 af1. sec/sec.
short 2 almanac week number
short 2 GPS week number
long 4 Seconds of GPS week
unsigned
short
2 Word checksum
Total bytes 70