DR + GPS
STARTER KIT REFERENCE MANUAL
Lassen DR + GPS Reference Manual 41
Table 6: GSA Message
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 - 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)
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GSV - GPS Satellites in View The GSV message identifies the GPS satellites in view, including their PRN
number, elevation, azimuth and SNR value. Each message contains data for four
satellites. Second and third messages are sent when more than 4 satellites are in
view. Fields #1 and #2 indicate the total number of messages being sent and the
number of each message respectively.
$GPGSV,x,x,xx,xx,xx,xxx,xx,xx,xx,xxx,xx,xx,xx,
xxx,xx,xx,xx,xxx,xx*hh<CR><LF>
Table 7: GSV Message
Field # Description
1 Total number of GSV messages
2 Message number: 1 to 3
3 Total number of satellites in view
4 Satellite PRN number
5 Satellite elevation in degrees (90° Maximum)
6 Satellite azimuth in degrees true (000 to 359)
7 Satellite SNR (C/No), null when not tracking
8, 9, 10, 11 PRN, elevation, azimuth and SNR for second satellite
12, 13, 14, 15 PRN, elevation, azimuth and SNR for third satellite
16, 17, 18, 19 PRN, elevation, azimuth and SNR for fourth satellite
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