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APPENDIX B 2201/NMEA communication protocols
Page 40 2201 INSTALLATION MANUAL, Revision B
GPS/WAAS
satellites in view
GPS Satellites in View: Number of SVs in view, PRN numbers,
elevation, azimuth and SNR values. Four satellites maximum
per transmission, additional satellite data sent in second or
third sentence.
Note 1: SNR (C/No) 00-99 dB, null when not tracking.
Note 2: Azimuth, range 000 to 359 degrees.
Note 3: Elevation, range 00 to 90 degrees.
Note 4: GPS satellites are identified by SV #1 to 32.
WAAS satellites have reserved SV # 33 to 64.
WAAS PRN 120-138 are mapped to SV 33 through 51. Only
WAAS PRN 120, 122, 134 have been operational.
Example:
GPS Satellites in View Data sentence.
$GPGSV,2,1,06,03,12,238,06,07,82,008,15,11,04,053,,27,43,178,12*7F<
CR><LF>
Messages 2
Msg. No. 1
SV Visible 6
PRN 03
Elevation 12
°
Azimuth 238
°
SNR 6 dB
PRN 07
Elevation 82
°
Header Contents of data fields
$GPGSV
,x,x,xx,xx,xx,xxx,xx……….,xx,xx,xxx,xx.x*hh<CR><LF>
4
th
SV
2
nd
-3
rd
SV
SNR (Note 1)
Azimuth, Degrees (Note 2)
Elevation, Degrees (Note 3)
Satellite ID Number (Note 4)
Total Satellites in View
Message Number, 1 to 3
Total Number of Messages, 1 to 3