ashtech DG16 Reference Manual page 269

Table 8.20. $GPGSV Message Format (Continued)
Parameter
f15 Signal to noise ration (dbHz)
d16 Satellite PRN number
d17 Elevation (degrees)
d18 Azimuth (degrees)
f19 Signal to noise ration (dbHz)
*hh Checksum
SBAS satellites numbers are actually 120 to 138, but are represented in the NMEA messages with
numbers 33 to 64. The offset from NMEA SBAS satellite ID to SBAS satellite ID is 87. Add 87 to the
satellite ID fields in the NMEA messages to derive the actual SBAS PRN number.
Typical GSV message:
$GPGSV,2,2,8,08,43,294,47,07,19,062,42,05,49,314,49,02,03,120,2
9 *45
Table 8.21 outlines the response message.
Field
$GPGSV
2
2
8
08
43
294
47
07
19
062
42
05
49
NMEA Commands
Description
Table 8.21. Typical GSV Message
Description
Header
Indicates that two GSV messages will output
Indicates that this is the second message
Indicates that eight satellites are visible
Indicates PRN 8 is visible
Elevation of PRN 8
Azimuth of PRN 8
Signal to noise ration of PRN 8
Indicates PRN 7 is visible
Elevation of PRN 7
Azimuth of PRN 7
Signal to noise ratio of PRN 7
Indicates PRN 5 is visible
Elevation of PRN 5
Range
30 to 60
1 to 32 for GPS
33 to 64 for SBAS
0° to 90°
0° to 359°
30 to 60
2-character hex
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