SiRF starⅢ high performance GPS Chip Set
Very high sensitivity (Tracking Sensitivity: -159 dBm)
Extremely fast TTFF (Time To First Fix) at low signal level
Support NMEA 0183 data protocol
Built-in SuperCap to reserve system data for rapid satellite acquisition
Built-in patch antenna
LED indicator for GPS fix or not fix
LED OFF: Receiver switch off
LED ON: No fixed, Signal searching
LED Flashing: Position Fixed
Message ID $GPGGA GGA protocol heade
UTC Time 161229.487hhmmss.sss
Latitude 3723.2475ddmm.mmmm
/S Indicator
Longitude 12158.3416dddmm.mmm
E/W Indicator W E=east or W=wes
Position Fix Indicator 1 See Table B-3
Satellites Used 07 Range 0 to 12
HDOP 1.0 Horizontal Dilution of Precision
MSL Altitude1 9.0 meters
Units M meters
Geoid Separation
1
meters
Units M meters
Age of Diff. Corr.second
Diff. Ref. Station ID 0000
Checksum *18
<CR><LF> End of message termination
SiRF Technology Inc. does not support geoid corrections. Values are WGS84 ellipsoid heights.
=north or S=south
ull fields when DGPS is not used
Table B-3 Position Fix Indicator
Value Descri
0Fix not available or invali
1GPS SPS Mode, fix vali
2Differential GPS, SPS Mode , fix vali
3GPS PPS Mode, fix vali
tion
p
r
N
N
m
t
GLL-Geographic Position-Latitude/Longitude
Table B-4 contains the values for the following example:
$GPGLL,3723.2475,N,12158.3416,W,161229.487,A*2C
Table B-4 GLL Data Format
Name Exam
Message ID $GPGLL GLL protocol heade
Latitude 3723.2475ddmm.mmmm
/S Indicator n
Longitude 12158.3416dddmm.mmm
E/W Indicator W E=east or W=wes
UTC Position 161229.487hhmmss.sss
Status A A=data valid or V=data not valid
Checksum *2C
<CR><LF> End of message termination
leUnits Description
=north or S=south
GSA-GNSS DOP and Active Satellites
Table B-5 contains the values for the following example:
Message ID $GPGSAGSA protocol header
Mode1 A See Table B-6
Mode2 3 See Table B-7
Satellite Used1 07 Sv on Channel 1
Satellite Used1 02 Sv on Channel 2
…..
Satellite Used1 Sv on Channel 12
PDOP 1.8 Position dilution of Precision
HDOP 1.0 Horizontal dilution of Precision
VDOP 1.5 Vertical dilution of Precision
Checksum *33
<CR><LF> End of message termination
1. Satellite used in solution.
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
3 3D
n
r
N
r
)
)
)
)
GSV-GNSS Satellites in View
Table B-8 contains the values for the following example:
$GPGSV,2,1,07,07,79,048,42,02,51,062,43,26,36,256,42,27,27,138,42*71
$GPGSV,2,2,07,09,23,313,42,04,19,159,41,15,12,041,42*41
Table B-8 GSV Data Format
NameExampleDescriptio
Message ID $GPGSVGSV protocol heade
umber of Messages1 2 Range 1 to 3
Message Numbe
Satellites in View07
Satellite ID 07 Channel 1(Range 1 to 32
Elevation 79 degreesChannel 1(Maximum90
Azimuth 048 degreesChannel 1(True, Range 0 to 359)
SNR(C/No) 42 dBHzRange 0 to 99,null when not tracking
……. …….
Satellite ID 27 Channel 4 (Range 1 to 32
Elevation 27 DegreesChannel 4(Maximum90
Azimuth 138 DegreesChannel 4(True, Range 0 to 359)
SNR(C/No) 42 dBHzRange 0 to 99,null when not tracking
Checksum *71
<CR><LF> End of message termination
Depending on the number of satellites tracked multiple messages of GSV data may be required.
1
1 Range 1 to 3
N
N N
m
t
yy
t
RMC-Recommended Minimum Specific GNSS Data
Table B-10 contains the values for the following example:
$GPRMC,161229.487,A,3723.2475,N,12158.3416,W,0.13,309.62,120598,,*10
Table B-10 RMC Data Format
Name ExampleUnitsDescription
Message ID $GPRMCRMC protocol header
UTC Time 161229.487hhmmss.sss
Status A A=data valid or V=data not valid
Latitude 3723.2475ddmm.mmmm
/S Indicator
Longitude 12158.3416dddmm.mmm
E/W Indicator W E=east or W=wes
Speed Over Ground 0.13 knots
Course Over Ground 309.62 degrees True
Date 120598 ddmm
Magnetic Variation2 degreesE=east or W=wes
Checksum *10
<CR><LF> End of message termination
SiRF Technology Inc. does not support magnetic declination. All “course over ground” data are
geodetic WGS48 directions.
=north or S=south
VTG-Course Over Ground and Ground Speed
g
g
N
r
p
$GPVTG,309.62,T,,M,0.13,N,0.2,K*6E
Name ExampleUnitsDescription
Message ID $GPVTGVTG protocol header
Course 309.62 degreesMeasured headin
Reference T True
Course degreesMeasured headin
Reference M Magnetic
Speed 0.13 knotsMeasured horizontal speed
Units
Speed 0.2 Km/h
Units K Kilometers
Checksum *6E
<CR><LF> End of message termination
Knots
Measured horizontal speed
er hour
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