Spectra Precision ProMark 800 Reference Manual - Manual (Page 270)

258
Query Command Library
ALM: Almanac Message
Function This command allows you to output the latest GPS almanac
data. Each response line describes the almanac data from a
given GPS satellite.
Command Format Syntax
$PASHQ,ALM[*cc]
Response Format Syntax
$GPALM,d1,d2,d3,d4,h5,h6,h7,h8,h9,h10,h11,h12,h13,h14,h15*cc
Parameters
Example $PASHQ,ALM
$GPALM,31,1,01,65535,00,39A8,4E,1FEA,FD65,A10C8C,B777FE,935A86,C
994BE,0C6,001*73
$GPALM,31,2,02,65535,00,4830,4E,00D9,FD49,A10D24,64A66D,3B6857,E
6F2A3,0BA,001*7A
$GPALM,31,3,03,65535,00,552B,4E,F572,FD3B,A10CE1,20E624,0CD7E1,D
10C32,0CA,001*0D
Parameter Description Range
d1 Total number of messages 01-32
d2 Number of this message 01-32
d3 Satellite PRN number 01-32
d4 GPS week 4 digits
h5 SV health (in ASCII hex) 2 bytes
h6 e: Excentricity (in ASCII hex) 4 bytes
h7 toe: Almanac reference time, in seconds (ASCII hex) 2 bytes
h8 Io: Inclination angle, in semicircles (ASCII hex) 4 bytes
h9
OMEGADOT: Rate of ascension, in semicircles/second
(ASCII hex)
4 bytes
h10
A1/2: Square root of semi-major axis, in meters 1/2
(ASCII hex)
6 bytes
h11
OMEGA: Argument of perigee, in semicircles (ASCII
hex)
6 bytes
h12
OMEGA0: Longitude of ascension mode, in semicircles
(ASCII hex)
6 bytes
h13 Mo: Mean anomaly, in semi-circles (ASCII hex) 6 bytes
h14 af0: Clock parameter, in seconds (ASCII hex) 3 bytes
h15 af1: Clock parameter, in seconds/second (ASCII hex) 3 bytes
*cc Checksum *00-*FF