Globalsat EM-406 User Manual

環天衛星科技股份有限公司
PRODUCT USER MANUAL
GPS RECEIVER ENGINE BOARD
EM-406
GlobalSat Technology Corporation 台北縣中和市建一路 186 16 (遠東世紀廣場)
Features:
SiRF star 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
Specification:
General
Chipset SiRF Star Frequency L1, 1575.42 MHz C/A code 1.023 MHz chip rate Channels 20 channel all-in-view tracking Sensitivity -159 dBm
Accuracy
Position 10 meters, 2D RMS 5 meters, 2D RMS, WAAS enabled Velocity 0.1 m/s Time 1us synchronized to GPS time
Datum
Default WGS-84
Acquisition Time
Reacquisition 0.1 sec., average Hot start 1 sec., average Warm start 38 sec., average Cold start 42 sec., average
Dynamic Conditions
Altitude 18,000 meters (60,000 feet) max Velocity 515 meters /second (1000 knots) max Acceleration Less than 4g Jerk 20m/sec **3
Power
Main power input 4.5V ~ 6.5V DC input Power consumption 70mA
Protocol
Electrical level TTL level, Output voltage level: 0V ~ 2.85V Baud rate 4,800 bps Output message NMEA 0183 GGA, GSA, GSV, RMC, VTG, GLL
Physical Characteristics
Dimension 30mm*30mm*10.5mm
Operating temperature -40 to +85
Pin Assignment
Pin description
* VIN (DC power input):
This is the main DC supply for a 4.5V ~6.5 DC input power.
* TX:
This is the main transmits channel for outputting navigation and measurement data to user’s navigation software or user written software.
* RX:
This is the main receive channel for receiving software commands to the engine board from SiRFdemo software or from user written software.
* GND:
GND provides the ground for the engine board. Connect all grounds.
SOFTWARE COMMAND
r
N
N N
m
t
N
p
d
d
d
d
NMEA Output Command
GGA-Global Positioning System Fixed Data
Table B-2 contains the values for the following example:
$GPGGA,161229.487,3723.2475,N,12158.3416,W,1,07,1.0,9.0,M,,,,0000*18
Table B-2 GGA Data Format
Name Example Units Description
Message ID $GPGGA GGA protocol heade UTC Time 161229.487 hhmmss.sss Latitude 3723.2475 ddmm.mmmm
/S Indicator Longitude 12158.3416 dddmm.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 0 Fix not available or invali 1 GPS SPS Mode, fix vali 2 Differential GPS, SPS Mode , fix vali 3 GPS 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 3723.2475 ddmm.mmmm
/S Indicator n Longitude 12158.3416 dddmm.mmm E/W Indicator W E=east or W=wes UTC Position 161229.487 hhmmss.sss Status A A=data valid or V=data not valid Checksum *2C <CR><LF> End of message termination
le Units Description
=north or S=south
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 Example Units Description
Message ID $GPGSA GSA 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
Name Example Descriptio
Message ID $GPGSV GSV protocol heade
umber of Messages1 2 Range 1 to 3 Message Numbe Satellites in View 07 Satellite ID 07 Channel 1(Range 1 to 32 Elevation 79 degrees Channel 1(Maximum90 Azimuth 048 degrees Channel 1(True, Range 0 to 359) SNR(C/No) 42 dBHz Range 0 to 99,null when not tracking ……. ……. Satellite ID 27 Channel 4 (Range 1 to 32 Elevation 27 Degrees Channel 4(Maximum90 Azimuth 138 Degrees Channel 4(True, Range 0 to 359) SNR(C/No) 42 dBHz Range 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 Example Units Description
Message ID $GPRMC RMC protocol header UTC Time 161229.487 hhmmss.sss Status A A=data valid or V=data not valid Latitude 3723.2475 ddmm.mmmm
/S Indicator Longitude 12158.3416 dddmm.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 degrees E=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 Example Units Description
Message ID $GPVTG VTG protocol header Course 309.62 degrees Measured headin Reference T True Course degrees Measured headin Reference M Magnetic Speed 0.13 knots Measured 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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