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GSA - GNSS DOP and Active Satellites
Table B-5 contains the values for the following example:
$GPGSA,A,3,07,02,26,27,09,04,15,,,,,,1.8,1.0,1.5*33
Table B-5 GSA Data Format
Name
Message ID
Mode 1
Mode 2
1
Satellite Used
1
Satellite Used
.....
1
Satellite Used
2
PDOP
2
HDOP
2
VDOP
Checksum
<CR><LF>
1.
Satellite used in solution.
2.
Maximum DOP value reported is 50. When 50 is reported, the actual DOP may be much larger.
Table B-6 Mode1
Value
Description
M
Manual-forced to operate in 2D or 3D mode
A
2Dautomatic-allowed to automatically switch 2D/3D
Table B-7 Mode 2
Value
Description
1
Fix Not Available
2
2D (<4 SVs used)
3
3D (>3 SVs used)
2012/7/30
Example
Units
$GPGSA
A
3
07
02
1.8
1.0
1.5
*33
Description
GSA protocol header
See Table B-6
See Table B-7
Sv on Channel 1
Sv on Channel 2
Sv on Channel 12
Position dilution of Precision
Horizontal dilution of Precision
Vertical dilution of Precision
End of message termination
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