SIM66 Series_NMEA Message_User Guide_V1.01
www.simcom.com
18 / 25
V Invalid
A Valid
cs
STR
Checksum
A hexadecimal number obtained by calculating an XOR of
all characters from '$' to '*' in this statement
<CR><LF>
End of message termination
(1): GPS+SBAS+QZSS joint positioning is only supported by firmware with the version of R3.4.0.0 or
above
2.4.3 Message ID GSA: Output GNSS Dilution of Precision and Effective Satellite
Information
Syntax:GSA,Smode,FS,sv1,sv2,sv3,sv4,sv5,sv6,sv7,sv8,sv9,sv10,sv11,sv12,PDOP,HDOP,VDOP
*cs
Example:$GPGSA,A,3,14,22,18,31,,,,,,,,,5.572,2.788,4.824*36
Parameter
Format
Description
--
STR
Positioning system flag
GP GPS+SBAS+QZSS joint positioning(1)
BD BDS system standalone positioning
GN Multiple system joint positioning
Smode
STR
Positioning mode specified states
M Manually specify 2D or 3D positioning
A Automatically switch to 2D or 3D positioning
FS
UINT
Positioning mode
1 Not positioning
2 2D positioning or INS positioning
3 3D positioning
sv1~sv12
UINT
Participating satellite ID
When there are less than 12 satellites participating in the
positioning, the insufficient area is filled in empty and it only
output the first 12 satellites if there are more than 12
satellites
GPS satellite ID is 1~32
BDS satellite ID is 161~197 (160 + BDS PRN)
GLONASS satellite ID is 65~92(2)
Galileo satellite ID is 101~136(3)
QZSS satellite ID is 193, 194, 195, 199(4)
SBAS satellite ID is 33~51(5)
PDOP
DOUBLE
Position dilution of precision, 0.0~127.000
HDOP
DOUBLE
Horizontal dilution of precision, 0.0~127.000
NOTE