ashtech G12 - VTG: Course and Speed Over Ground

173
Commands
Table 4.99 defines the POS response structure.
If there is no valid position, POS provides: number of satellites, time, DOPs,
firmware version ID. All other fields are null.
If there are not enough satellites to compute DOP, then the DOP field is null.
Typical Response:
$PASHR,POS,0,06,183805:00,3722.36221,N, 12159.82742, W,
+00016.06,179.22,021.21,+003.96+34,06.1,04.2,03.2,01.4,GA00*cc
Table 4.99. POS Response Structure
Field Description Range
d1 position type:
0 = autonomous
1 = position differentially corrected with RTCM code
0 to 1
d2 Number of satellites used in position computation 3 to 12
m1 Current UTC time, (hhmmss), of position computation in hours, min-
utes and seconds
00 to 235959.50
m2 Latitude component of position in degrees, minutes, and fraction of
minutes (ddmm.mmmm)
0 to 90°
c1 Latitude sector: N = North, S = South ‘N’ or ‘S’
m3 Longitude component of position in degrees, minutes, and fraction
of minutes
0 to 180°
c2 Longitude sector: E = East, W = West W or E
f1 Altitude in meters above WGS-84 reference ellipsoid.
For 2-D position computation this item contains altitude held fixed.
± 30000.00
f2 Reserved
f3 True track/true course over ground in degrees (000.00 to 359.99) 0 to 359.9
f4 Speed over ground in knots 0 to 999.9
f5 Vertical velocity in meters per second ± 999.9
f6 PDOP - position dilution of precision 0 to 99.9
f7 HDOP - horizontal dilution of precision 0 to 99.9
f8 VDOP - vertical dilution of precision 0 to 99.9
f9 TDOP - time dilution of precision 0 to 99.9
s1 Firmware version ID 4 character string
G12RevD.book Page 173 Tuesday, April 2, 2002 4:33 PM