228 DG14 and DG16 Board & Sensor Reference Manual
ALM: Almanac Message
$PASHS,NME,ALM,c,s
This command enables or disables the almanac message where c is the receiver
serial port (A, B, or C) and s is ON or OFF.
Example
Enter the following command to enable ALM message on port C
$PASHS,NME,ALM,C,ON
$PASHQ,ALM,c
Query the almanac message, where c is the optional output port.
$GPALM
There is one response message for each satellite in the GPS constellation. The
length of the message is calculated by the characters, in halves of bytes, not full
bytes. The response to the set or query command is in the form:
$GPALM,d1,d2,d3,d4,h5,h6,h7,h8,h9,h10,h11,h12,h13,h14,
h15*cc <Enter>
Table 8.2. ALM Response Message
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. Eccentricity (In ASCII Hex) 4 bytes
h7 toe. Almanac reference time (seconds. In ASCII Hex) 2 bytes
h8 Io. Inclination angle (semicircles. In ASCII Hex) 4 bytes
h9 OMEGADOT. Rate of ascension (semicircles/sec. In ASCII Hex) 4 bytes
h10 A½. Square Root of semi-major axis (Meters & ½ In ASCII Hex) 6 bytes
h11
w. Argument of perigee (semicircle. In ASCII Hex)
6 bytes
h12 OMEGA0. Longitude of ascension mode (semicircle. In ASCII Hex) 6 bytes
h13 Mo. Mean anomaly (semicircle. In ASCII Hex) 6 bytes
h14 afo. Clock parameter (seconds. In ASCII Hex) 3 bytes
h15 af1. Clock parameter (sec/sec. In ASCII Hex) 3 bytes
*cc Checksum
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