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NMEA-GP-GSA

Description:

Standard NMEA: GNSS DOP and active satellites.

Configuration:

  • NMEA-GN-GSA_GNSS for combined (average) output from both receivers

    • Operation and navigation modes are taken from the “best” receiver

    • The list of satellite IDs contains the union of satellites used by GNSS1 and GNSS2

    • The PDOP, HDOP and VDOP are the averages of the respective values of the two receivers

  • NMEA-GN-GSA_GNSS1 for output from GNSS 1 receiver

    • This is the standard NMEA GSA for GNSS1.

  • NMEA-GN-GSA_GNSS2 for output from GNSS 2 receiver

    • This is the standard NMEA GSA for GNSS2.

  • NMEA-GN-GSA_FUSION for output from Fusion

    • Operation and navigation modes are taken from the “best” receiver

    • The list of satellite IDs contains the union of satellites used by GNSS1 and GNSS2

    • The PDOP, HDOP and VDOP are the averages of the respective values of the two receivers

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 uses the “GN” talker ID and NMEA v4.11 satellite numbering.

Example messages (one epoch):

CODE
$GNGSA,A,3,04,06,07,09,11,16,20,30,,,,,0.98,0.49,0.85,1*0A\r\n
$GNGSA,A,3,67,68,69,76,77,78,83,84,,,,,0.98,0.49,0.85,2*0A\r\n
$GNGSA,A,3,02,03,07,08,13,15,25,26,,,,,0.98,0.49,0.85,3*09\r\n
$GNGSA,A,3,09,14,24,26,27,28,33,,,,,,0.98,0.49,0.85,4*04\r\n

Message fields:

#

Field

Format

Unit

Nullable

Example

Description

1

mode_op

Character

-

N

A

Operation mode: always A (automatic, allowed to automatically switch 2D/3D)

2

mode_nav

Integer

-

N

1

Navigation mode: 1 (fix not available), 2 (2D) or 3 (3D)

3..14

ids

Integer

-

Y

01,03,15

ID numbers of satellites used in solution. See the NMEA 0183 version 4.11 standard document.

15

pdop

Float (.2)

-

Y

1.2

Position dillution of precision

16

hdop

Float (.2)

-

Y

1.2

Horizontal dillution of precision

17

vdop

Float (.2)

-

Y

1.2

Vertical dillution of precision

18

gnss_id

Integer

-

Y

1

GNSS system ID: 1 (GPS, SBAS), 2 (GLONASS), 3 (Galileo), 4 (BeiDou), 5 (QZSS)

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