SkyTraq PX1120S - Page 16

16
SkyTraq Technology, Inc. Preliminary Draft www.skytraq.com.tw
GSV – GNSS Satellites in View
Number of satellites (SV) in view, satellite ID numbers, elevation, azimuth, and SNR value. Four satellites maximum per
transmission.
Structure:
$GPGSV,x,x,xx,xx,xx,xxx,xx,…,xx,xx,xxx,xx,x *hh<CR><LF>
1 2 3 4 5 6 7 4 5 6 7 8 9
Example:
$GPGSV,4,1,15,10,79,250,50,194,73,072,,193,69,127,45,25,64,114,46,1*67<CR><LF>
$GPGSV,4,2,15,20,54,175,45,32,44,334,46,41,39,242,43,12,36,055,46,1*68<CR><LF>
$GPGSV,4,3,15,31,32,256,45,14,25,310,39,24,15,049,38,21,07,191,35,1*61<CR><LF>
$GPGSV,4,4,15,15,04,106,18,29,03,144,,26,01,206,,1*56<CR><LF>
$GLGSV,2,1,06,80,77,332,44,69,55,098,49,70,46,347,43,73,29,221,45,1*79<CR><LF>
$GLGSV,2,2,06,79,25,026,42,71,01,325,,1*76<CR><LF>
$GBGSV,3,1,12,21,77,107,50,26,73,278,49,06,59,009,45,03,58,203,43,1*7D<CR><LF>
$GBGSV,3,2,12,16,58,002,47,07,55,180,,01,53,142,43,09,47,329,43,1*73<CR><LF>
$GBGSV,3,3,12,02,40,241,39,10,31,200,40,22,25,134,41,14,19,321,41,1*77<CR><LF>
Field
Name
Example
Description
1
Number of message
4
Total number of GSV messages to be transmitted (1-5)
2
Sequence number
1
Sequence number of current GSV message
3
Satellites in view
15
Total number of satellites in view (00 ~ 20)
4
Satellite ID
10
01 ~ 32 are for GPS; 33 ~ 64 are for WAAS (PRN minus 87); 193
~ 197 are for QZSS; 65 ~ 88 are for GLONASS (GL PRN) ; 01 ~ 36
are for GALILEO (GA PRN); 01 ~ 37 are for BDS (BD PRN). GPS,
GLONASS, GALILEO and BDS satellites are differentiated by the
GNSS system ID in table 3. Maximally 4 satellites are included in
each GSV sentence.
5
Elevation
79
Satellite elevation in degrees, (00 ~ 90)
6
Azimuth
250
Satellite azimuth angle in degrees, (000 ~ 359 )
7
SNR
50
C/No in dB (00 ~ 99)
Null when not tracking
8
GNSS System ID
1
Signal ID
*
9
Checksum
67
*GNSS Signal ID identifies the GNSS signal name according to Table 3.