Alm: Almanac Message - ashtech DG16 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>
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. Eccentricity (In ASCII Hex)
h7 toe. Almanac reference time (seconds. In ASCII Hex)
h8 Io. Inclination angle (semicircles. In ASCII Hex)
h9 OMEGADOT. Rate of ascension (semicircles/sec. In ASCII Hex)
h10 A½. Square Root of semi-major axis (Meters & ½ In ASCII Hex)
w
h11
. Argument of perigee (semicircle. In ASCII Hex)
h12 OMEGA0. Longitude of ascension mode (semicircle. In ASCII Hex) 6 bytes
h13 Mo. Mean anomaly (semicircle. In ASCII Hex)
h14 afo. Clock parameter (seconds. In ASCII Hex)
h15 af1. Clock parameter (sec/sec. In ASCII Hex)
*cc Checksum
228
Table 8.2. ALM Response Message
Description
DG14 and DG16 Board & Sensor Reference Manual
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
3 bytes
3 bytes