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Acutime 2000 Synchronization Kit User Guide C-7
C NMEA 0183
C.4.3 GSA – GPS DOP and Active Satellites
The GSA messages indicates the GPS receiver's operating mode and
lists the satellites used for navigation and the DOP values of the
position solution.
$GP GSA,a,x,xx,xx,xx,xx,xx,xx,xx,xx,xx,xx,
xx,xx,x.x,x.x,x.x*hh
<CR><LF>
Table C-5 GSA – GPS DOP and Active Satellites
Message Parameters
Field # Description
1 Mode: M = Manual, A = Automatic. In manual mode, the
receiver is forced to operate in either 2D or 3D mode. In
automatic mode, the receiver is allowed to switch
between 2D and 3D modes subject to the PDOP and
satellite masks.
2 Current Mode: 1 = fix not available, 2 = 2D, 3 = 3D
3 to 14 PRN numbers of the satellites used in the position
solution. When less than 12 satellites are used, the
unused fields are null
15 Position dilution of precision (PDOP)
16 Horizontal dilution of precision (HDOP)
17 Vertical dilution of precision (VDOP)
hh Checksum