Chapter 10. Query Command Library; Alm: Almanac Message - Magellan ProFlex 500 Reference Manual

Chapter 10. Query Command Library

ALM: Almanac Message

Function
Command Format
Response Format
This command allows you to output the latest GPS almanac
data. Each response line describes the almanac data from a
given GPS satellite.
Syntax
$PASHQ,ALM[*cc]
Syntax
$GPALM,d1,d2,d3,d4,h5,h6,h7,h8,h9,h10,h11,h12,h13,h14,h15*cc
Parameters
Parameter
d1 Total number of messages
d2 Number of this message
d3 Satellite PRN number
d4 GPS week
h5 SV health (in ASCII hex)
h6 e: Excentricity (in ASCII hex)
h7 toe: Almanac reference time, in seconds (ASCII hex)
h8 Io: Inclination angle, in semicircles (ASCII hex)
OMEGADOT: Rate of ascension, in semicircles/second
h9
(ASCII hex)
A1/2: Square root of semi-major axis, in meters 1/2
h10
(ASCII hex)
OMEGA: Argument of perigee, in semicircles (ASCII
h11
hex)
OMEGA0: Longitude of ascension mode, in semicircles
h12
(ASCII hex)
h13 Mo: Mean anomaly, in semi-circles (ASCII hex)
h14 af0: Clock parameter, in seconds (ASCII hex)
h15 af1: Clock parameter, in seconds/second (ASCII hex)
*cc Checksum
Description Range
01-32
01-32
01-32
4 digits
2 bytes
4 bytes
2 bytes
4 bytes
4 bytes
6 bytes
6 bytes
6 bytes
6 bytes
3 bytes
3 bytes
*00-*FF
183