Rainbow Electronics GE863-GPS low power - Manual (Page 102)

GE863-GPS Software User Guide
1vv0300724 Rev. 3 - 05/07/07
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5.4.3 GSA - GNSS DOP and Active Satellites
This sentence reports the GPS receiver’s operating mode, satellites used in the navigation solution
reported by the GGA sentence and DOP values.
Table D 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 D: GSA Data Format
Name Example Units Description
Message ID $GPGSA GSA protocol header
Mode 1 A See Table E
Mode 2 3 See Table F
Satellite Used1.
Satellite used in
solution.1 07 Sv on Channel 1
Satellite Used1 02 Sv on Channel 2
....
Satellite Used1
PDOP 1.8
HDOP 1.0
VDOP 1.5
Checksum *33
End of message termination
Table E: Mode 1
Value Description
M Manual—forced to operate in 2D or 3D mode
A 2D Automatic—allowed to automatically switch
2D/3D
Table F: Mode 2
Value Description
1 Fix not a vailable
2 2D (<4 SVs used)
3 3D (>3 SVs used)