NMEA-GX-GSV | Fixposition

Description:

Standard NMEA: GNSS satellites in view.

This NMEA message contains different headers depending on the source constellation (e.g., NMEA-GP-GSV for GPS, NMEA-GA-GSV for Galileo). Please ensure you parse all available constellation characters to avoid losing any information.

Configuration:

NMEA-GX-GSV_GNSS for combined (average) output from both receivers
- The list of satellites contains the union of satellites used by GNSS1 and GNSS2
NMEA-GX-GSV_GNSS1 for output from GNSS 1 receiver
- This is the standard NMEA GSV for GNSS1.
NMEA-GX-GSV_GNSS2 for output from GNSS 2 receiver
- This is the standard NMEA GSV for GNSS2.
NMEA-GX-GSV_FUSION for output from Fusion
- The list of satellites contains the union of satellites used by GNSS1 and GNSS2

Notes:

These messages does not contain any information that would let one tell them apart. Do not enable more than one of these in the same port.
This message is according to NMEA 0183 v4.11 (and erratas).
This message is output mutiple times per epoch. A set of GSV sentences is generated for each combination system (GNSS) and signal.
This message uses the per-system talker IDs and NMEA v4.11 satellite numbering.

Example messages (one epoch):

$GPGSV,1,1,01,06,01,025,,0*54\r\n
$GPGSV,3,1,11,11,26,049,46,12,27,095,45,18,10,180,36,20,10,076,40,1*64\r\n
$GPGSV,3,2,11,25,68,086,49,26,13,289,41,28,57,283,46,29,78,222,49,1*67\r\n
$GPGSV,3,3,11,31,36,307,46,32,13,235,43,84,,,40,1*6D\r\n
$GPGSV,3,1,09,11,26,049,40,12,27,095,36,18,10,180,40,25,68,086,45,6*69\r\n
$GPGSV,3,2,09,26,13,289,40,28,57,283,45,29,78,222,46,31,36,307,44,6*6D\r\n
$GPGSV,3,3,09,32,13,235,40,6*59\r\n
$GLGSV,1,1,01,83,31,150,,0*45\r\n
$GLGSV,2,1,08,72,13,309,43,73,63,327,50,74,18,312,39,79,03,123,42,1*70\r\n
$GLGSV,2,2,08,80,52,110,50,81,10,029,45,82,56,049,47,83,64,160,40,1*75\r\n
$GAGSV,1,1,00,0*74\r\n
$GBGSV,1,1,02,10,02,077,,36,78,280,,0*76\r\n
$GBGSV,2,1,06,08,26,067,40,26,23,306,44,29,66,180,50,30,46,058,49,1*7C\r\n
$GBGSV,2,2,06,35,12,213,41,36,42,135,47,1*77\r\n
$GBGSV,1,1,02,08,26,067,45,13,25,079,40,B*04\r\n

Message fields:

#	Field	Format	Unit	Nullable	Example	Description
1	`sentences`	Integer	-	Y	`4`	Total number of sentences (1 to 9)
2	`sent_num`	Integer	-	Y	`1`	Sentence number (1 to 9)
3	`num_sats`	Integer	-	Y	`08`	Total number of satellites in view
						The following fields are repeated up to four times (i = 0…3):
4 + i·4	`sat_id_`n	Integer	-	Y	`03`	Satellite ID number
5 + i·4	`elev_`n	Integer (00-90)	deg	Y	`27`	Satellite elevation
6 + i·4	`azim_`n	Integer (000-359)	deg	Y	`086`	Satellite azimuth from true North
7 + i·4	`cno_`n	Integer (00-99)	dB-Hz	Y	`32`	Satellite SNR (C/No)
						The last field:
4 + `num_sats`·4	`signal_id`	Hex	-	N		Signal ID (see below)

Signal IDs (signal_id):

ID	Signal
`0`	No signal (any talker ID)
`1`	GPS/SBAS L1C/A (talker ID `GP`)
`6`	GPS L2C-L (talker ID `GP`)
`7`	Galileo L1-BC (talker ID `GA`)
`2`	Galileo E5b (talker ID `GA`)
`1`	BeiDou B1I (talker ID `GB`)
`B`	BeiDou B2I (talker ID `GB`)
`1`	GLONASS G1 C/A (talker ID `GL`)
`3`	GLONASS G2 C/A (talker ID `GL`)

See the NMEA 0183 document for the full list of defined signals.