Trimble Outdoors aggps 332 Benutzerhandbuch
AgGPS 332 GPS Receiver User Guide 89
NMEA-0183 Messages C
C.9
GSV (GPS Satellites in View)
The GSV message identifies the number of SVs in view, the
PRN
numbers, elevation, azimuth and SNR values.
The GSV message structure is:
$GPGSV,4,1,13,02,02,213,,03,
-3,000,,11,00,121,,14,13,172,05*6
-3,000,,11,00,121,,14,13,172,05*6
7
Table C.9 describes these fields.
Note –
Because the contents of this NMEA message do not change
significantly during a one-second interval, the receiver outputs this
message at a maximum rate of 1 Hz.
message at a maximum rate of 1 Hz.
Table C.9
GSV message fields
Field
Description
1
Total number of messages of this type in this cycle
2
Message number
3
Total number of SVs visible
4
SV PRN number
5
Elevation in degrees, 90
0
maximum
6
Azimuth, degrees from true north, 000
0
to 359
0
7
SNR, 00-99 dB (null when not tracking)
8–11
Information about second SV, same format as fields 4–7
12–15
Information about third SV, same format as fields 4–7
16–19
Information about fourth SV, same format as fields 4–7